SECTION 15971
HVAC ELECTRIC CONTROL SYSTEMS
PART 1 - GENERAL
1.1 GENERAL
A. HVAC Controls will be a combination of field mounted controls utilizing room thermostats and /or control panels provide with factory equipment such as Makeup Air Units, etc.
B. Work of this section which required connection to the SCADA system should be coordinated between the HVAC Controls Contractor and the Process Instrumentation Controls Contractor such that the HVAC sequences outlined in this section are fully executed.
1.2 DESCRIPTION OF WORK
A. Extent of electric HVAC control systems work required by this section is indicated on drawings and schedules, by requirements of this section, related sections.
1. Control system components
2. Control sequences are specified in this section.
B. Provide the following electrical work as work of this section, complying with requirements of Division 16 sections:
1. Control wiring between field-installed controls, indicating devices, and unit control panels. All control wiring to be routed in conduit and shall comply with Division 16 requirements. Coordinate with Electrical Contractor.
2. Power supply wiring for power source to power connection on controls and/or unit control panels unless shown on electrical drawings.
3. Interlock wiring between electrically operated equipment units; and between equipment and field-installed control devices unless shown on electrical drawings.
4. Provide coordination as required with process instrumentation and control system integrator as may be needed to allow for proper HVAC system operation and to integrate signals and alarms sensed by HVAC control components, but controlled and /or alarmed by system integrator components. Any control required for a fully functional HVAC system per the Sequence of Operation outlined here-in which is not provided by the Process Instrumentation & Controls contractor shall be provided as part of this Section. The end result shall be a fully functional HVAC control system.
1.3 RELATED SECTIONS
A. Control dampers and damper actuators are specified in Section 15891 – Duct Accessories.
B. Process Instrumentation & Control – Section 16900 and all related Division 16 sections.
1.4 QUALITY ASSURANCE
A. Manufacturer’s Qualifications: Firms regularly engaged in manufacture of electric control equipment, of types and sizes required, whose products have been in satisfactory use in similar service for not less than 5 years.
B. Installer’s Qualifications: Firms specializing and experienced in electric control system installations for not less than 5 years.
C. Codes and Standards:
1. Electrical Standards: Provide electrical products which have been tested, listed and labeled by UL and comply with NEMA standards.
2. NEMA Compliance: Comply with NEMA standards pertaining to components and devices for electric control systems.
3. NFPA Compliance: Comply with NFA 90A “Standard for the installation of Air Conditioning and Ventilating Systems” where applicable to controls and control sequences.
1.5 SUBMITTALS
A. Submittal Coordination: HVAC Controls Submittals shall be coordinated and reviewed by the Process Controls System Integrator. The System Integrator shall review for Coordination and Approve the submittals before they are submitted to the Engineer for Review.
B. Product Data
1. Submit manufacturer’s technical product data for each control device furnished, indicating dimensions, capacities, performance characteristics, electrical characteristics, finishes of materials, and including installation instructions and start-up instructions.
2. Coordination items between the HVAC Controls Contractor and the Systems Integrator shall be clearly shown as part of the submittals. Items provided by the system Integrator shall be indicated. Also indicate responsibility for installation of coordinated components.
C. Shop Drawings
1. Submit shop drawings for each HVAC electric control system:
a. Schematic flow diagram of system showing fans, dampers, equipment and control devices.
b. Clearly show work installed under this section and tie-ins and control supplied/furnished by Process Instrumentation & Controls Contractor.
c. Label each control device with setting or adjustable range of control.
d. Indicate all required electrical wiring. Clearly differentiate between portions of wiring that are factory-installed and portions to be field- installed.
e. Provide details of faces of control panels, including controls, instruments, and labeling.
f. Include written description of sequence of operation.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Provide factory-shipping cartons for each piece of equipment, and control device. Maintain cartons through shipping, storage and handling as required to prevent equipment damage, and to eliminate dirt and moisture from equipment. Store equipment and materials inside and protected from weather.
PART 2 - PRODUCTS
2.1 ACCEPTABLE MANUFACTURERS
1. Component manufacturer shall be generally as listed below:
a. Siemens
b. Johnson Controls
c. Honeywell
d. Landis Staefa
2. Some individual component manufacturers may vary. These may be listed separately with the component descriptions.
2.2 MATERIALS AND EQUIPMENT
A. General
1. Provide electric control products in sizes and capacities indicated, consisting of valves, dampers, thermostats, clocks, sensors, controllers, contactors, low voltage transformers, and other components as required for a complete installation. Except as otherwise indicated, provide manufacturer’s standard control system components as indicated by published product information, designed and constructed as recommended by manufacturer. Provide electric control systems with following functional and construction features as indicated.
2. Hazardous and Corrosive Environments: Provide electric control systems suitable for corrosive and/or Class I, Division 1 or 2 (explosion proof) environments. Coordinate these with other work in the associated areas and with Division 16 work. Use proper NEMA rated panels, boxes, devices, etc., & utilize proper materials.
B. Remote-Bulb Thermostats: Provide remote-bulb thermostats of on-off, or modulating type, or reverse acting as required by sequence of operation. Provide liquid-filled units designed to compensate for changes in ambient temperature at instrument case. Provide capillary and bulb of copper or stainless (corrosion resistant where required). Equip bulbs in water lines with separate wells of same material as bulb. Support and protect capillary & bulbs by installing in thru conduit.
1. Provide scale settings and differential settings where applicable, which are clearly visible and adjustable from front of instrument.
2. Equip on-off remote-bulb thermostats with precision snap switches, and with electrical rating as required by application.
3. Provide modulating remote-bulb thermostats of potentiometer type constructed so that complete potentiometer coil and wiper assembly is removable for inspection or replacement without disturbing calibration of instrument.
C. Thermostats
1. Provide space thermostats with readily accessible adjustment devices and 5- degree dead band capability and 55°F night setback capability.
a. Provide thermostats with red-reading glass or spiral bi-metallic thermometers.
b. Low Voltage On-Off Thermostats: Comply with general requirements indicated for line-voltage thermostats. Provide thermostats of bimetal operated mercury-switch type with adjustable anticipation heater.
2. Electronic Programmable Room Heating/Cooling Thermostats:
a. Field-installed programmable, manual staged auto-changeover electronic digital thermostat. The thermostat shall offer three heating and two cooling stages with temperature control. An OFF-HEAT Auto-Cool Emerg system switch, OFF-AUTO fan switch and indicating LED’s shall be provided along with 7-day programming.
b. The thermostat must also be programmable for Occupied/Unoccupied status. During Occupied, the supply fan shall remain on and the unit to cycle heating cooling as required to maintain space setpoint. During Unoccupied cycle, the supply fan is to cycle on with heating/cooling operation in order to maintain setback temperature.
c. Thermostat is also to provide auxiliary contact to engage auxiliary fans (heat recovery) whenever the thermostat is in Occupied mode. During unoccupied mode, the auxiliary fan signal should be off.
d. Provide Honeywell T7351 Programmable thermostat or equivalent.
D. Air Quality Sensors
1. Provide air quality sensors capable of sensing carbon monoxide and nitrogen dioxide to levels as called for in the sequence of operation.
a. Acceptable manufacturers:
1) Vulcain VA301M Series Stand-Alone Dual Gas Monitor with compatible remote sensors as recommended to adequately cover the space.
2) Or equal.
2. Provide with necessary control panel required to make system operational.
2.3 SENSORS
A. Electronic Sensors General: Provide electronic temperature sensors of supersensitive resistance type, which are vibration and corrosion-resistant, and of wall mounted immersion, duct mounting, averaging or bulb type as required for application.
B. Electronic Sensors: Vibration and corrosion resistant; for wall, immersion, or duct mounting as required.
1. Thermistor temperature sensors as follows:
a. Accuracy: Plus or minus 0.5 deg F at calibration point.
b. Wire: Twisted, shielded-pair cable.
c. Insertion Elements for Liquids: Brass socket with minimum insertion length of 2-1/2 inches.
d. Outside-Air Sensors: Watertight inlet fitting, shielded from direct sunlight.
C. Electric Contactors
1. Provide contactors for operating or limit-control of electric heating loads, which are UL-listed for 100,000 cycles of resistive loads. Equip with replaceable molded coils and replaceable silver cadmium oxide contacts. Coat core laminations with heat-resistant inorganic film to reduce core losses. Provide line and load terminals on contactors with higher-than-35-amp rating, or provide one- piece formed-and–welded pressure type. Provide screw-type contactors for 35- amp-or-lower rating. Equip field-mounted contactors with suitable steel enclosures; and provide open-type mounting for those installed in factory- fabricated panels.
D. Local Control Panels
1. Provide control panels with suitable brackets for either wall or floor mounting and proper NEMA rating for location, for each supply fan and miscellaneous control system. Locate panel adjacent to systems served.
a. Match NEMA rating and material of panel construction with panels provided by Division 16 work in each space. Coordinate with Division 16 contractor.
b. Utilize minimally sized panels for application. Overly large panels with large amount of empty space will be rejected and will require the contractor to replace with acceptable size.
PART 3 - EXECUTION
3.1 INSPECTION
A. Examine areas and conditions under which electric control systems are to be installed. Do not proceed with work until unsatisfactory conditions have been corrected in manner acceptable to installer.
3.2 SEQUENCE OF OPERATION
A. Building 15 – Battery A Control Building
1. Entry 100, Office 104, Corridor 102 & 103, Break Room 112, Corridor 109
a. Gas fired furnace 15-GFF-1, & Condensing Unit 15-ACCU-1 shall be controlled by a electronic programmable thermostat. On a call for heating/cooling 15-GFF-1 and as appropriate, 15-ACCU-1 (for cooling) shall engage. Once the space temperature is satisfied, 15-GFF-1 and 15- ACCU-1 (in cooling mode) shall shut down.
b. During the Occupied mode, 15-GFF-1 supply fan shall run continuously. 15-GFF-1 burner or 15-ACCU-1 (cooling) shall cycle on and off as needed.
c. During the Unoccupied mode, 15-GFF-01 supply fan shall cycle on and off with the heating/cooling operation.
d. Coordinate the occupied/unoccupied schedule with the owner. (Note: Schedule shall be the same as 15-GFF-2 & 3)
e. Provide interlock for occupied/unoccupied operation for 15-EF-3 & 15- EF4.
2. Corridor 109
a. Electric Wall heater 15-EWH-1 shall be controlled by integral thermostat.
1) On a call for heating, the unit shall engage.
2) When the heating setpoint is satisfied, the unit shall shut down.
3. Workshop 105
a. Gas Fired Unit Heaters 15-GUH-1 & 2 to be controlled by respective space thermostats. On a call for heat, the respective unit is to cycle on to heat the space. When the respective space heating requirements are satisfied, the respective Gas Fired Unit Heater is to cycle off.
4. Workshop Storage 107
a. Gas Fired Unit Heater 15-GUH-3 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
5. Elevator Equipment Room 108
a. Exhaust fan 15-EF-6 to be controlled by a reverse acting thermostat.
1) When the space temperature is above setpoint (75°F adjustable), exhaust fan 15-EF-6 shall engage.
2) When the space temperature is below setpoint, exhaust fan 15-EF-6 shall be off.
3) Provide necessary contactors, transformers, deadbands and time delays to operate fan based on prescribed sequence and to prevent short cycling of fan operation. House any devices and wiring terminal strips in small control panel.
6. Workshop 111
a. Gas Fired Unit Heater 15-GUH-4 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
7. Garage 113
a. Gas Fired Unit Heaters 15-GUH-5 & 6 to be controlled by respective space thermostats. On a call for heat, the respective unit is to cycle on to heat the space. When the respective space heating requirements are satisfied, the respective Gas Fired Unit Heater is to cycle off.
b. Exhaust Fan15-EF-2 (located on roof above space) to operate continuously. (Design intent is for the fan never to be shut down.)
c. Make-up air unit 15-MAU-1 (located in Workshop 111), to be controlled by control panel supplied by unit manufacturer.
1) Panel to be mounted where located on plan (Field Verify final location).
2) Unit to have ON-OFF-AUTO control with discharge air temperature controller dial located inside control panel along with operation indicator lights, O.A. temperature burner reset control (above O.A. temperature setpoint, the burner operation is to be locked out, below the O.A. temperature, the burner operation is to be enabled), warning lights, and discharge damper control.
3) Provide interlock to inlet damper so that damper opens when 15- MAU-1 operates.
4) Unit also to have freezestat controls.
5) Provide relays for ON-OFF interlock control for exhaust fan 15-EF- 1.
6) Auto Control: With the switch in auto, 15-MAU-1 can be automatically started and stopped remotely via timeclock control.
7) With the switch in the “AUTO” position, 15-MUA-1 shall be controlled to operate for 6 hours continuously for each 24 hour period.
8) A detection system shall be used to sense carbon monoxide levels and nitrogen dioxide levels. 15-MUA-1 and 15-EF-1 shall also operate to maintain carbon monoxide levels below 35 ppm and nitrogen dioxide levels below 1 ppm. Sensors shall be located and mounted as recommended by sensor manufacturer.
d. Exhaust Fan 15-EF-1 to be interlocked to operate in conjunction with 15- MAU-1. When exhaust fan 15-EF-1 engages, its discharge damper is to open.
1) When 15-MUA-1 is off, 15-EF-1 to be off.
2) When 15-MUA-1 is on, 15-EF-1 is to be on.
8. Locker Rm 211, Unassigned 200, File Rm 201
a. Gas fired furnace 15-GFF-2, & Condensing Unit 15-ACCU-2 shall be controlled by a electronic programmable thermostat. On a call for heating/cooling 15-GFF-2 and as appropriate, 15-ACCU-2 (for cooling) shall engage. Once the space temperature is satisfied, 15-GFF-2 and 15- ACCU-2 (in cooling mode) shall shut down.
b. During the Occupied mode, 15-GFF-2 supply fan shall run continuously. 15-GFF-2 burner or 15-ACCU-2 (cooling) shall cycle on and off as needed.
c. During the Unoccupied mode, 15-GFF-2 supply fan shall cycle on and off with the heating/cooling.
d. Coordinate the occupied/unoccupied schedule with the owner. (Note: Schedule shall be the same as 15-GFF-1 & 3)
9. Office 203, Lab Storage 206, Corridor 213
a. Gas fired furnace 15-GFF-3, & Condensing Unit 15-ACCU-3 shall be controlled by a electronic programmable thermostat. On a call for heating/cooling 15-GFF-3 and as appropriate, 15-ACCU-3 (for cooling) shall engage. Once the space temperature is satisfied, 15-GFF-3 and 15- ACCU-3 (in cooling mode) shall shut down.
b. During the Occupied mode, 15-GFF-3 supply fan shall run continuously. 15-GFF-3 burner or 15-ACCU-3 (cooling) shall cycle on and off as needed.
c. During the Unoccupied mode, 15-GFF-3 supply fan shall cycle on and off with the heating/cooling.
d. Coordinate the occupied/unoccupied schedule with the owner. (Note: Schedule shall be the same as 15-GFF-1 & 2).
10. Mechanical 205
a. Electric Wall heater 15-EWH-2 shall be controlled by integral thermostat.
1) On a call for heating, the unit shall engage.
2) When the heating setpoint is satisfied, the unit shall shut down
11. Locker Rm 211, Womens 207, Mens 208, Shower 210
a. Electric Baseboard heaters 15-EBBR-1 & 2 shall be controlled by respective integral thermostats.
1) On a call for heating, the respective unit shall engage.
2) When the heating setpoint is satisfied, the respective unit shall shut down
b. Exhaust fan 15-EF-3 shall be interlocked to operate in conjunction with 15- GFF-01 occupied/unoccupied control.
1) When 15-GFF-1 is in occupied mode, 15-EF-3 shall be on.
2) When 15-GFF-1 is in unoccupied mode, 15-EF-3 shall be off.
12. Corridor 213
a. Exhaust fan 15-EF-4 shall be interlocked to operate in conjunction with 15- GFF-01 occupied/unoccupied control.
1) When 15-GFF-1 is in occupied mode, 15-EF-4 shall be on.
2) When 15-GFF-1 is in unoccupied mode, 15-EF-4 shall be off.
13. Electrical 209
a. Exhaust Fan 15-EF-5 and motorized damper 15-D-1 at existing Louver to be controlled by ON-OFF-AUTO switch with reverse acting thermostat.
1) In the “ON” position, 15-EF-5 to engage and the damper is to open.
2) In the “OFF” position, 15-EF-5 is to be off and the damper is to be closed.
3) In the “AUTO” position, the fan and damper will be controlled by a reverse acting thermostat with remote sensing bulb near room ceiling. Thermostat setpoint at 80ºF (adjustable). Control panel location as indicated on drawings.
B. Building 20 – Raw Wastewater Pump Station
1. Mechanical Room – 104
a. Gas Fired Unit Heater 20-GUH-2 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
b. Gas fired makeup air unit 20-MAU-1 to be controlled by control panel supplied by the Unit manufacturer.
1) The panel to be mounted where located on plan (Field Verify Final location).
2) Unit to have ON-OFF control with discharge air temperature controller dial located inside control panel along with, room over ride thermostat, operation indicator lights, O.A. temperature burner reset control (above O.A. temperature setpoint the burner operation is to be locked out, below the O.A. temperature setpoint, the burner operation is to be enabled), panel front indicator warning lights, and inlet damper control.
3) Provide interlock to unit inlet damper so that the damper opens when the unit operates.
4) Room over ride thermostat shall be remote sensing bulb type. Sensing bulb & capillary shall be stainless steel type suitable for mounting in a hazardous and corrosive environment. Wall penetration and conduit shall be sealed.
5) Provide Freezestat controls.
6) Provide interlock ON-OFF control of existing inline transfer fan located in northeast corner of Screening Room 103 and 20-CF-1. Fans should run when 20-MAU-1 is operating.
7) Provide and Coordinate Status interface with SCADA System with System Integrator. Status monitoring shall be for “Run” and “Fail”.
c. Existing 20-CF-1 fan shall be provided with new ON/OFF/AUTO operation control panel. ON/OFF/AUTO switch to be rotary type with “Green” run light all mounted in the Panel face.
1) With the switch in the AUTO mode, 20-CF-1system shall be interlocked with 20-MAU-1 operation.
2) ON mode, 20-CF-1 system shall manually operate.
3) OFF mode, 20-CF-1 system shall be off.
2. Upper Valve Room – 101
a. Gas fired makeup air unit 20-MAU-2 to be controlled by control panel supplied by the Unit manufacturer.
1) The panel to be mounted where located on plan (Field Verify Final location).
2) Unit to have ON-OFF control with discharge air temperature controller dial located inside control panel along with, operation indicator lights, O.A. temperature burner reset control (above O.A. temperature setpoint the burner operation is to be locked out, below the O.A. temperature setpoint, the burner operation is to be enabled), panel front indicator warning lights, and inlet damper control.
3) Provide interlock to unit inlet damper so that the damper opens when the unit operates.
4) Provide Freezestat controls.
5) Provide interlock for ON-OFF control of exhaust fan 20-EF-1. 20- EF-1 to operate when 20-MAU-2 is operating.
6) Provide and Coordinate Status interface with SCADA System with System Integrator. Status monitoring shall be for “Run” and “Fail”.
3. Electrical & Control Room – 102
a. Gas Fired Unit Heater 20-GUH-1 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
4. Stairwell SW-1
a. Electric Unit Heater 20-EUH-1 shall be controlled by integral thermostat.
1) On a call for heating, the unit shall engage.
2) When the heating setpoint is satisfied, the unit shall shut down.
C. Building 22 – Battery A Raw Wastewater Pump Station
1. Electrical/Mechanical - 103
a. Gas Fired Unit Heater 22-GUH-1 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
2. Outside Existing Electrical/Mechanical 103
a. Gas fired makeup air unit 22-MAU-1 to be controlled by control panel supplied by the Unit manufacturer.
1) The panel to be mounted where located on plan (Field Verify Final location).
2) Unit to have ON-OFF control with discharge air temperature controller dial located inside control panel along with, room over ride thermostat, operation indicator lights, O.A. temperature burner reset control (above O.A. temperature setpoint the burner operation is to be locked out, below the O.A. temperature setpoint, the burner operation is to be enabled), panel front indicator warning lights, and inlet damper control.
3) Provide interlock to unit inlet damper so that the damper opens when the unit operates.
4) Room over ride thermostat shall be remote sensing bulb type. Sensing bulb & capillary shall be stainless steel type suitable for
mounting in a hazardous and corrosive environment. Wall penetration and conduit shall be sealed.
5) Provide Freezestat controls.
6) Provide interlock ON-OFF control of existing 22-CF-1 Odor Control fan located in Mechanical Rm. Fans should run when 22-MAU-1 is operating.
7) Provide and Coordinate Status interface with SCADA System with System Integrator. Status monitoring shall be for “Run” and “Fail”.
b. Existing 22-CF-1 fan shall be provided with new ON/OFF/AUTO operation control panel. ON/OFF/AUTO switch to be rotary type with “Green” run light all mounted in the Panel face.
1) With the switch in the AUTO mode, 22-CF-1system shall be interlocked with 22-MAU-1 operation.
2) ON mode, 22-CF-1system shall manually operate.
3) OFF mode, 22-CF-1 system shall be off.
D. Building 25 – Grit Removal Building
1. Mechanical/Electrical - 102
a. Gas Fired Unit Heater 25-GUH-1 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
b. Gas fired makeup air unit 25-MAU-1 to be controlled by control panel supplied by the Unit manufacturer.
1) The panel to be mounted where located on plan (Field Verify Final location).
2) Unit to have ON-OFF control with discharge air temperature controller dial located inside control panel along with, room over ride thermostat, operation indicator lights, O.A. temperature burner reset control (above O.A. temperature setpoint the burner operation is to be locked out, below the O.A. temperature setpoint, the burner operation is to be enabled), panel front indicator warning lights, and inlet damper control.
3) Provide interlock to unit inlet damper so that the damper opens when the unit operates.
4) Room over ride thermostat shall be remote sensing bulb type. Sensing bulb & capillary shall be stainless steel type suitable for mounting in a hazardous and corrosive environment. Wall penetration and conduit shall be sealed.
5) Provide Freezestat controls.
6) Provide interlock ON-OFF control of existing 25-CF-1 Odor Control fan located in Mechanical Rm. Fans should run when 25-MAU-1 is operating.
7) Provide and Coordinate Status interface with SCADA System with System Integrator. Status monitoring shall be for “Run” and “Fail”.
c. Existing 25-CF-1 fan shall be provided with new ON/OFF/AUTO operation control panel. ON/OFF/AUTO switch to be rotary type with “Green” run light all mounted in the Panel face.
1) With the switch in the AUTO mode, 25-CF-1 system shall be interlocked with 25-MAU-1 operation.
2) ON mode, 25-CF-1 system shall manually operate.
3) OFF mode, 25-CF-1 system shall be off.
E. Building 35 – Blower Building
1. Blower Room - 101
a. Gas Fired Unit Heaters 35-GUH-1 & 2 to be controlled by respective space thermostats. On a call for heat, the respective unit is to cycle on to heat the space. When the respective space heating requirements are satisfied, the respective Gas Fired Unit Heater is to cycle off.
b. Sidewall propeller exhaust fans 35-EF-1 & 2 and dampers 35-D-1 & 2 located at air intake hoods and 35-D-3 located at existing intake louver shall be controlled as follows (Note: Fan speed control and damper interlocks to be coordinated with System Integrator and SCADA control):
1) Manual and Automatic control through the SCADA system. When “OFF” sidewall fans are off, the respective sidewall fan dampers are to close and the respective intake dampers 35-D-1, 2 & 3 are to close.
2) Manual Mode: Manual operation via SCADA PLC manual mode selection: Sidewall fans will engage the sidewall fan dampers will open and the intake dampers 35-D-1, 2 & 3 will open. Fan speed setting can manually be set through the SCADA PLC.
3) Automatic Mode: Automatic operation via SCADA PLC Auto Mode selection. Sidewall fans and dampers are controlled by a space temperature sensor that is reverse acting in control: Fan speed to be controlled based on room temperature. The higher the room temperature is above setpoint, the faster the fan speed shall operate. At 10 degrees above setpoint (adjustable) the fan shall operate at 100% speed (adjustable). At 1 degree above setpoint, the fan shall operate at 10% speed (adjustable). The dampers shall open whenever the fans are running. When the fans are off, the dampers shall all be closed. Provide time delays and deadbands as required for smooth operation and to prevent cycling.
4) The VFD’s will be provided as part of Division 16.
5) Monitor the Sidewall exhaust fan status and space temperature through the SCADA PLC. Alarm when High or Low temperatures are sensed in the space. High and Low temperature Alarm setpoints are to be adjustable.
2. Control Room - 102
a. Gas Fired Unit Heater 35-GUH-3 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
b. Exhaust Fan 35-EF-3 and motorized damper 35-D-4 at existing Louver to be controlled by ON-OFF-AUTO switch with reverse acting thermostat.
1) In the “ON” position, 35-EF-3 to engage and the damper is to open.
2) In the “OFF” position, 35-EF-3 is to be off and the damper is to be closed.
3) In the “AUTO” position, the fan and damper will be controlled by a reverse acting thermostat with remote sensing bulb near room
ceiling. Thermostat setpoint at 80ºF (adjustable). Control panel location as indicated on drawings.
3. Stairwell – SW-1
a. Gas Fired Unit Heater 35-GUH-4 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
F. Building 45 – RAS-WAS Pump Building
1. Pump Room – B101
a. Exhaust Fan 45-EF-1 shall be interlocked to operate with 45-MAU-1.
1) When the fan is engaged, its motorized discharge damper shall open.
2) When the fan shuts down, its motorized discharge damper shall be closed.
2. Control Room - 102
a. Electric Unit Heater 45-EUH-2 shall be controlled by integral thermostat.
1) On a call for heating, the unit shall engage.
2) When the heating setpoint is satisfied, the unit shall shut down.
3. Meter Room - 101
a. Gas fired makeup air unit 45-MAU-1 to be controlled by control panel supplied by the Unit manufacturer.
1) The panel to be mounted where located on plan (Field Verify Final location).
2) Unit to have ON-OFF control with discharge air temperature controller dial located inside control panel along with, operation indicator lights, O.A. temperature burner reset control (above O.A. temperature setpoint the burner operation is to be locked out, below the O.A. temperature setpoint, the burner operation is to be enabled), panel front indicator warning lights, and inlet damper control.
3) Provide interlock to unit inlet damper so that the damper opens when the unit operates.
4) Provide Freezestat controls.
5) Provide interlock relays for ON-OFF control of exhaust fan 45-EF-1.
b. Gas Fired Unit Heaters 45-GUH-2 & 3 to be controlled by respective space thermostats. On a call for heat, the respective unit is to cycle on to heat the space. When the respective space heating requirements are satisfied, the respective Gas Fired Unit Heater is to cycle off.
G. Building 50 – Battery B Filter Building
1. Blower Rm – 101
a. Electric Unit Heater 50-EUH-1 shall be controlled by integral thermostat.
1) On a call for heating, the unit shall engage.
2) When the heating setpoint is satisfied, the unit shall shut down.
b. Existing Exhaust Fan 50-EF-3 (Located in Electrical & Control Rm – 201 above) and motorized damper 50-D-1 at existing Louver to be controlled by ON-OFF-AUTO switch with reverse acting thermostat.
1) In the “ON” position, 50-EF-3 to engage and the damper is to open.
2) In the “OFF” position, 50-EF-3 is to be off and the damper is to be closed.
3) In the “AUTO” position, the fan and damper will be controlled by a reverse acting thermostat with remote sensing bulb near room ceiling. Thermostat setpoint at 80ºF (adjustable). Control panel location as indicated on drawings.
1. When the room temperature is above setpoint, the fan shall engage and the damper shall open.
2. When the room temperature is below setpoint, the fan shall be off and the damper shall close.
3. Provide deadbands and/or timers to prevent short cycling of control sequence.
2. Pump Rm – B101
a. Electric Unit Heater 50-EUH-2 shall be controlled by integral thermostat.
1) On a call for heating, the unit shall engage.
2) When the heating setpoint is satisfied, the unit shall shut down.
3. Chlorination Rm – 102
a. Electric Unit Heaters 50-EUH-3 & 50-EUH-4 shall be controlled by respective integral thermostats.
1) On a call for heating, the respective unit shall engage.
2) When the heating setpoint is satisfied, the respective unit shall shut down
b. Exhaust Fan 50-EF-1 and motorized damper 50-D-2 at existing Louver to be controlled by ON-OFF-AUTO switch with reverse acting thermostat.
1) In the “ON” position, 50-EF-1 to engage and the damper is to open.
2) In the “OFF” position, 50-EF-1 is to be off and the damper is to be closed.
3) In the “AUTO” position, the fan and damper will be controlled by a reverse acting thermostat with remote sensing bulb near room ceiling. Thermostat setpoint at 80ºF (adjustable). Control panel location as indicated on drawings.
1. When the room temperature is above setpoint, the fan shall engage and the damper shall open.
2. When the room temperature is below setpoint, the fan shall be off and the damper shall close.
3. Provide deadbands and/or timers to prevent short cycling of control sequence.
4. Electrical & Control Rm – 201
a. Gas Fired Unit Heater 50-GUH-1 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
b. Exhaust Fan 50-EF-4 and motorized damper 50-D-3 at existing Louver to be controlled by ON-OFF-AUTO switch with reverse acting thermostat.
1) In the “ON” position, 50-EF-4 to engage and the damper is to open.
2) In the “OFF” position, 50-EF-4 is to be off and the damper is to be closed.
3) In the “AUTO” position, the fan and damper will be controlled by a reverse acting thermostat with remote sensing bulb near room ceiling. Thermostat setpoint at 80ºF (adjustable). Control panel location as indicated on drawings.
5. Mechanical Rm – 203
a. Gas Fired Unit Heater 50-GUH-2 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
H. Building 60 – Biosolids Drying Building
1. Cake Handling Room – 104
a. Exhaust fan 60-EF-1 and Transfer fan 60-TF-2 to be interlocked to operate with Gas Fired Makeup Air unit 60-MAU-1. Design intent is for the fans to operate continuously.
b. Gas Fired Unit Heater 60-GUH-6 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
2. Dryer Room - 101
a. Gas fired makeup air unit 60-MAU-1 to be controlled by control panel supplied by the Unit manufacturer.
1) The panel to be mounted where located on plan (Field Verify Final location).
2) Unit to have ON-OFF control with discharge air temperature controller dial located inside control panel along with, operation indicator lights, O.A. temperature burner reset control (above O.A. temperature setpoint the burner operation is to be locked out, below the O.A. temperature setpoint, the burner operation is to be enabled), panel front indicator warning lights, and inlet damper control.
3) Provide interlock to unit inlet damper so that the damper opens when the unit operates.
4) Provide Freezestat controls.
5) Provide interlock relays for ON-OFF control of exhaust fan 60-EF-1, Transfer fan 60-TF-1 and 60-TF-2 and (Open-Close) damper 60-D-2.
6) Provide and Coordinate Status interface with SCADA System with System Integrator. Status monitoring shall be for “Run” and “Fail”.
b. Gas Fired Unit Heaters 60-GUH-1, 2, 3 & 4 to be controlled by respective space thermostats. On a call for heat, the respective unit is to cycle on to heat the space. When the respective space heating requirements are satisfied, the respective Gas Fired Unit Heater is to cycle off.
c. Sidewall propeller exhaust fans 60-EF-2 & 3 and dampers 60-D-3 & 4 located at intake louvers and 60-L-3 & 60-L-4 located at existing intake louver shall be controlled as follows (Note: Fan speed control and damper interlocks to be coordinated with System Integrator and SCADA control):
1) Manual and Automatic control through the SCADA system. When “OFF” sidewall fans are off, the respective sidewall fan dampers are to close and the respective intake dampers 60-D-03 & 4 are to close.
2) Manual Mode: Manual operation via SCADA PLC manual mode selection: Sidewall fans will engage; the sidewall fan dampers will open and the intake dampers 60-D-3 & 4 will open. Fan speed setting can manually be set through the SCADA PLC.
3) Automatic Mode: Automatic operation via SCADA PLC Auto Mode selection. Sidewall fans and dampers are controlled by a space temperature sensor that is reverse acting in control: Fan speed to be controlled based on room temperature. The higher the room temperature is above setpoint, the faster the fan speed shall operate. At 10 degrees above setpoint (adjustable) the fan shall operate at 100% speed (adjustable). At 1 degree above setpoint, the fan shall operate at 10% speed (adjustable). The dampers shall open whenever the fans are running. When the fans are off, the dampers shall all be closed. Provide time delays and deadbands as required for smooth operation and to prevent cycling.
4) The VFD’s will be provided as part of Division 16.
5) Monitor the Sidewall exhaust fan status and space temperature through the SCADA PLC. Alarm when High or Low temperatures are sensed in the space. High and Low temperature Alarm setpoints are to be adjustable.
d. Ceiling Fans 60-CF-01, 02, 03 & 04 to be controlled via manual ON/OFF SPEED control switches.
1) Fans ON/OFF & SPEED control shall be manually set utilizing speed control switches supplied with fans.
e. Transfer fan 60-TF-1 to be interlocked with 60-MAU-1 operation. When 60-MAU-1 is on, Transfer Fan 60-TF-1 is to be ON and damper 60-D-02 (located in Heater Rm – 103) shall be open. Design intent is for Transfer fan 60-TF-1 to operate continuously.
3. Heater Rm – 103
a. Gas Fired Unit Heater 60-GUH-5 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
b. Combustion Air Intake damper 60-D-1 to be interlocked with Boiler Operation. When boiler burner begins its startup process, Intake damper 60-D-1 is to Open. When the Boiler Burner shuts down, Intake damper 60- D-1 is to close.
4. Electrical Rm – 102
a. Electric Unit Heater 60-EUH-1 shall be controlled by integral thermostat.
1) On a call for heating, the unit shall engage.
2) When the heating setpoint is satisfied, the unit shall shut down.
b. Ductless Split System 60-DSS-1 with its Condensing Unit 60-ACCU-1 to be controlled by room Thermostat.
1) On a call for cooling, the system shall engage and cool the space.
2) When the cooling setpoint is satisfied, the system shall cycle off.
I. Building 75 – Dechlorination Building
1. Blower Room - 101
a. Gas Fired Unit Heater 75-GUH-2 to be controlled by space thermostat. On a call for heat, the unit is to cycle on to heat the space. When the space heating requirements are satisfied, the Gas Fired Unit Heater is to cycle off.
J. Building 80 – Sludge Storage – Fermentation
1. Pipe Chase / Belt Thickener Area (Note: Units located on concrete roof above)
a. Gas fired makeup air units 80-MAU-1, 2 & 3 to be controlled by respective control panels supplied by the Unit manufacturer. Control panels shall be mounted on the units in respective NEMA4X enclosure. All three unit to run continuously.
1) The panel to be mounted where located on plan (Field Verify Final location).
2) Unit to have ON-OFF control with discharge air temperature controller dial located inside control panel along with, operation indicator lights, O.A. temperature burner reset control (above O.A. temperature setpoint the burner operation is to be locked out, below the O.A. temperature setpoint, the burner operation is to be enabled), panel front indicator warning lights, and inlet damper control.
3) Room over ride thermostats for each unit shall be suitable for high moisture environment and remote mounted down in space.
4) Provide interlock to unit inlet damper so that the damper opens when the unit operates.
5) Provide Freezestat controls.
6) Provide interlock relays for ON-OFF control of exhaust fans 80-EF- 1, 2, 3 & 4.
7) Provide and Coordinate Status interface with SCADA System with System Integrator. Status monitoring shall be for “Run” and “Fail”.
b. Exhaust fans 80-EF-1, 2, 3 & 4 shall be interlocked to operate with Makeup Air Units 80-MAU-1, 2 & 3. Design intent is for all four (4) fans to operate continuously.
2. WAS & Filtrate Storage Tank Areas
a. Supply Fans 80-SF-01, 02, 03 & 04 to be manually operated. There shall be an “ON-OFF” switch located at the respective door to the fiberglass dome enclosure for each fan. Coordinate with Division 16 work.
3. Polymer Storage
a. Electric Unit Heater 80-EUH-5 shall be controlled by integral thermostat.
1) On a call for heating, the unit shall engage.
2) When the heating setpoint is satisfied, the unit shall shut down.
4. Electrical Room
a. Electric Unit Heater 80-EUH-4 shall be controlled by integral thermostat.
1) On a call for heating, the unit shall engage.
2) When the heating setpoint is satisfied, the unit shall shut down.
b. Cooling method of the electrical room shall be determined by the outside air temperature. When the outside air temperature is sensed to be below 65
°F (adjustable) the ductless split system cooling shall be disabled and the cooling shall be provided by ventilation as follows:
1) Exhaust Fan 80-EF-5 and motorized damper 80-D-1 at Louver 80-L- 1 to be controlled by ON-OFF-AUTO switch with reverse acting thermostat.
2) In the “ON” position, 80-EF-5 to engage and the damper is to open.
3) In the “OFF” position, 80-EF-5 is to be off and the damper is to be closed.
4) In the “AUTO” position, the fan and damper will be controlled by a reverse acting thermostat with remote sensing bulb near room ceiling. Thermostat setpoint at 75ºF (adjustable). Control panel location as indicated on drawings.
c. When the outside air temperature is above setpoint, the cooling ventilation system shall be locked out. 80-EF-5 shall be off and damper 80-D-1 shall be closed. The Ductless Split System 80-DSS-1 with its Condensing Unit 80-ACCU-1 shall be enabled and it shall be allowed to operate and be controlled by the room Thermostat.
1) On a call for cooling, the system shall engage and cool the space.
2) When the cooling setpoint is satisfied, the system shall cycle off.
d. Note: Control Panel ON-OFF-Auto switch position operation: ON position switch will operate the fan and open damper no matter what the outside air temperature is. The ductless split operation shall be disabled. OFF position will always turn off the exhaust fan and close the damper no matter what the outside air temperature. The ductless split system shall be enabled. Auto position will automatically switch between exhaust fan and damper operation or ductless split system dependant on outside air temp sensor setting.
K. Building 90 – Sludge Dewatering
1. Mechanical Room 101
a. Gas fired makeup air units 90-MAU-1 & 2 to be controlled by respective control panel supplied by the Unit manufacturer.
1) The panel to be mounted where located on plan (Field Verify Final location).
2) Unit to have ON-OFF control with discharge air temperature controller dial located inside control panel along with, operation indicator lights, O.A. temperature burner reset control (above O.A. temperature setpoint the burner operation is to be locked out, below the O.A. temperature setpoint, the burner operation is to be enabled), panel front indicator warning lights, and inlet damper control.
3) Provide interlock to unit inlet damper so that the damper opens when the unit operates.
4) Provide Freezestat controls.
5) Provide respective interlock ON-OFF control of existing 90-CF-1 & 90-CF-2 to 90-MAU-1 & 90-MAU-2 Odor Control fan located in Mechanical Rm. Fans should run when respective makeup air unit is operating.
6) Provide and Coordinate Status interface with SCADA System with System Integrator. Status monitoring shall be for “Run” and “Fail”.
b. Existing 90-CF-1 fan shall be provided with new ON/OFF/AUTO operation control panel. ON/OFF/AUTO switch to be rotary type with “Green” run light all mounted in the Panel face.
1) With the switch in the AUTO mode, 90-CF-1 system shall be interlocked with 90-MAU-1 operation.
2) ON mode, 90-CF-1 system shall manually operate.
3) OFF mode, 90-CF-1 system shall be off.
c. Existing 90-CF-2 fan shall be provided with new ON/OFF/AUTO operation control panel. ON/OFF/AUTO switch to be rotary type with “Green” run light all mounted in the Panel face.
1) With the switch in the AUTO mode, 90-CF-2 system shall be interlocked with 90-MAU-2 operation.
2) ON mode, 90-CF-2 system shall manually operate.
3) OFF mode, 90-CF-2 system shall be off.
2. General Building – Various Locations
a. Hot Water Unit Heaters 90-HWUH-1 through 14 shall be controlled by respective thermostats. On a call for heat, the respective heater fan shall engage. When the temperature is satisfied, the heater fan shall shut down. (Note: Water flow through hydronic unit heaters is to be continuous during the heating season. There are no hydronic control valves to be installed. Intent is for the Plant Operator to engage the hydronic pump at the start of the heating season to engage the hot water flow. Space temperature is satisfied by operating the unit heater fans via the thermostat.)
3. Polymer Room – 104
a. Exhaust fan 90-EF-01and its discharge damper shall be continuously enabled. The fan shall be operating and its damper shall be interlocked to be open. If the fan is shut down, its damper is to close.
L. General Interlock between Fans and motorized backdraft or discharge dampers
1. Provide interlock wiring between fans and associated motorized backdraft or discharge dampers supplied as part of the fan package.
a. When fans engage, the dampers are to open.
b. When fan shuts down, the dampers are to close.
3.3 INSTALLATION OF ELECTRIC CONTROL SYSTEMS
A. General
1. Install systems and materials in accordance with manufacturer’s instructions and roughing-in drawings, and details on drawings. Install electrical components and use electrical products complying with requirements of applicable Division-16 sections of these specifications. Mount controllers at convenient locations and heights. Provide working HVAC control system utilizing industry standard electric control devices and as specified. Finished Controls shall operate HVAC equipment as Control sequences call for.
2. Install local control panels for equipment as listed and install per Division 16 requirements.
B. Control Wiring: The term “control wiring” is defined to include providing of wire, conduit and miscellaneous materials as required for mounting and connecting electric control devices.
C. Wiring System: Install complete control wiring system for electric control systems. Conceal wiring except in mechanical rooms and areas where other conduit and piping are exposed. Provide multi-conductor instrument harness (bundle) in place of single conductors where number of conductors can be run along common path. Fasten flexible conductors bridging cabinets and doors, neatly along hinge side, and protect against abrasion. Tie and support conductors neatly.
D. Number-code or color-code conductors, excluding those used for local individual room controls, appropriately for future identification and servicing of control system. Also label all remote control devices with identification consistent with shop drawing and maintenance manuals.
E. Reset Limit Controls: Install manual-reset limit controls to be independent of power controllers; automatic duct heater resets may, at Contractor’s option, be installed in interlock circuit of power controllers.
F. Unit-Mounted Equipment: Where control devices are indicated to be unit-mounted, ship electric relays, electric switches, valves, dampers, and damper motors to unit manufacturer for mounting and wiring at factory.
G. Provide accessories such as mounting brackets, fasteners, supports, etc. which are compatible with environment where devices will be located. In corrosive environments use stainless steel materials.
H. Provide electrical contactors for automatic operation of equipment where needed when magnetic starters are not furnished as part of the design.
3.4 ELECTRICAL WIRING AND CONNECTION INSTALLATION
A. Install raceways, boxes, and cabinets according to Division 16
B. Install building wire and cable according to Division 16
C. Install signal and communication cable according to Division 16
1. Conceal cable, except in mechanical rooms and areas where other conduit and piping are exposed.
2. Install exposed cable in raceway.
3. Install concealed cable in raceway.
4. Bundle and harness multiconductor instrument cable in place of single cables where several cables follow a common path.
5. Fasten flexible conductors, bridging cabinets and doors, along hinge side; protect against abrasion. Tie and support conductors.
6. Number-code or color-code conductors for future identification and service of control system, except local individual room control cables.
D. Connect manual-reset limit controls independent of manual-control switch positions. Automatic duct heater resets may be connected in interlock circuit of power controllers.
E. Connect hand-off-auto selector switches to override automatic interlock controls when switch is in hand position.
3.5 FIELD QUALITY CONTROL
A. Manufacturer's Field Service: Engage a factory-authorized service representative to inspect field-assembled components and equipment installation, and electrical connections.
1. Operational Test: After electrical circuitry has been energized, start units to confirm proper unit operation. Remove malfunctioning units, replace with new units, and retest.
2. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment, and retest.
3. Calibration test electric controllers by disconnecting input sensors and stimulating operation with compatible signal generator.
B. Engage a factory-authorized service representative to perform startup service.
C. Replace damaged or malfunctioning controls and equipment.
1. Start, test, and adjust control systems.
2. Demonstrate compliance with requirements, including calibration and testing, and control sequences.
3. Adjust, calibrate, and fine tune circuits and equipment to achieve sequence of operation specified.
3.6 ADJUSTING AND CLEANING
A. Start-UP
1. Start-up, test, and adjust electric control systems in presence of manufacturer’s authorized representative. Demonstrate compliance with requirements. Replace damaged or malfunctioning controls and equipment.
B. Cleaning
1. Clean factory-finished surfaces. Repair any marred or scratched surfaces with manufacturer’s touch-up paint.
C. Final Adjustment
1. After completion of installation, adjust thermostats, control valves, motors, and similar equipment provided as work of this section, verify control sequence operation. Provide verification documentation.
a. Final adjustment shall be performed by specially trained personnel in direct employ of manufacturer of primary temperature control system.
3.7 CLOSEOUT PROCEDURES
A. Owner’s Instructions
1. Provide services of manufacturer’s technical representative for two separate 4- hour days to instruct Owner’s personnel in operation and maintenance of electric control systems. The first training session shall be an initial overview with enough information for the Owner to understand the functionality, adjustment capability, etc. A subsequent follow-up training session is to take place with the owner after the owner has spent time using the controls and has a chance to develop additional questions, etc…
2. Schedule instruction with Owner; provide at least 7-day notice to Contractor and Engineer of initial training date. The follow-up training date shall be coordinated with the Owner.
END OF SECTION
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