SECTION 15767 HYDRONIC HEATING UNITS
PART 1 - GENERAL
1.1 SUMMARY
A. This Section includes the following:
1. Hydronic Unit Heaters
a. Special coatings for wet/corrosive locations
b. Disconnect switches suitable for environment & conforming to Division 16 requirements.
1.2 SUBMITTALS
A. Product Data: Include specialties and accessories for each unit type and configuration.
B. Maintenance Data: For propeller unit heaters to include in maintenance manuals speci- fied in Division 1. Include the following:
1. Maintenance schedules and repair parts lists for motors, coils, integral controls, and filters.
1.3 QUALITY ASSURANCE
A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.
1.4 COORDINATION
A. Coordinate layout and installation of propeller unit heaters and suspension system components with other construction that penetrates ceilings or is supported by them, including light fixtures, HVAC equipment, process components and piping, and parti- tion assemblies.
PART 2 - PRODUCTS
2.1 MANUFACTURERS
A. Manufacturers: Subject to compliance with requirements, provide products by one of the following:
1. Modine Manufacturing Company.
2. Sterling
2.2 HYDRONIC UNIT HEATERS
A. Description: An assembly including casing, coil, fan, and motor in horizontal dis- charge configuration with horizontal, adjustable louvers in blow-through configuration.
B. Size, capacity and motor and coating options as scheduled on drawings.
C. MATERIALS
1. Casing: 20 gauge and consist of front and back halves. Both halves are joined together at the top and bottom utilizing the condenser mounting screws. Casing top is provided with treaded hanger connections for unit suspension. Fan venture is formed in casing back half.
a. Casing shall be rated to prevent corrosion and painted with corrosion re- sistant, high solids gray-green finish.
D. COILS
1. Hot-Water Coil: DLP –type Copper tubes with malleable iron supply and return connections. Tubes are mechanically bonded to the collars of the aluminum fins. The condensers are warranted for operation at steam or hot water pressures and temperatures up to 150 psig and 375 deg F. for copper coils.
2. Fins are continuous across the width and depth of the condenser and are vertical- ly oriented to minimize the collection of dirt and dust.
3. Canadian Standards Association (CSA) requirements state that explosion-proof units may not be used with fluid temperatures in excess of 329 deg F or pressures in excess of 87 psig and still maintain their explosion proof rating for NEC igni- tion temperature rating T#B for grain dust.
4. All coils are leak tested at 165 to 200 psig, air under water.
5. Horizontal models: Coils are of serpentine design with horizontal tubes, vertical fins and center supply and return connections at top and bottom of unit. All tube bends are brazed. All tubes have individual expansion bends. Copper tubes are 1” O.D. with 0.030 wall thickness.
E. FAN
1. Fans/Fan Guards: Fans are aluminum and secured to a steel hub. Each fan is balanced and is designed specifically for the unit heater on which it is installed. Horizontal units are equipped with a combination fan guard/motor-mounting bracket. The guard is constructed of steel rod
F. FAN MOTORS
1. Motors: Designed for continuous duty and operation in maximum ambient tem- perature of 104 deg F. Provide standard TEFC motors.
G. ACCESSORIES & OPTIONS
1. Horizontal Configuration: Louver fin diffuser.
2. Special coatings: For units located in Wet and/or Corrosive Locations. Provide Heresite coating on unit cabinets and coils.
3. Disconnect switch: Disconnect switch must be suitable for environment and also must conform to Division 16 requirements.
H. CONTROLS
1. Control Devices: Wall mounted thermostat. In corrosive environments, the thermostat must be rated for use in such an environment.
PART 3 - EXECUTION
3.1 EXAMINATION
A. Examine areas to hydronic heating units for compliance with requirements for installa- tion tolerances and other conditions affecting performance.
B. Examine roughing-in for piping and electrical connections to verify actual locations be- fore unit installation.
C. Proceed with installation only after unsatisfactory conditions have been corrected.
3.2 INSTALLATION
A. Install hydronic heating units level and plumb.
B. Suspend hydronic unit heaters from structure with rubber-in-shear vibration isolators (rubber hangers).
C. Install wall-mounting thermostats and switch controls in electrical outlet boxes at heights to match lighting controls.
D. Anchor cabinet heaters to wall in locations shown per the manufacturers recommended practices.
3.3 CONNECTIONS
A. Piping installation requirements are specified in other Division 15 Sections. Drawings indicate general arrangement of piping, fittings, and specialties.
B. Unless otherwise indicated, install shutoff valve and union or flange on each connec- tion.
C. Install piping adjacent to machine to allow service and maintenance.
D. Ground equipment as applicable.
E. Tighten electrical connectors and terminals according to manufacturer's published torque-tightening values. If manufacturer's torque values are not indicated, use those specified in UL 486A and UL 486B.
3.4 CLEANING
A. After installing units, inspect unit cabinet or enclosure for damage to finish. Remove paint splatters and other spots, dirt, and debris. Repair damaged finish to match origi- nal finish.
B. After installing units, clean hydronic heating units internally according to manufactur- ers written instructions.
END OF SECTION
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