Greenheck Fan PVF User Manual

Part # 461006

MODEL PVF

INDIRECT GAS FIRED FURNACES FOR ENERGY RECOVERY UNITS

Installation, Operation and Maintenance Manual

RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE

WARNING!!!

Improper installation, adjustment, alteration, service or maintenance can cause injury or death. Read the installation, operating and maintenance instructions thoroughly before installing or servicing this equipment.

CAUTION!!!

Units are designed for outdoor installation only. DO NOT locate units indoors.

Shipping

Check the unit for shipping damage. If any shipping damage is found, it should be reported to the last carrier and your local Greenheck representative.

Indirect Fired Gas Unit Installations

Units are listed for installation in the United States and Canada

• Installation of gas fired duct furnaces must conform with local building codes. In the absence of local codes, installation must conform to the National Fuel Gas code, ANSI Z223.1 or in Canada, CAN/CGA-B149 installation codes.

• All electrical wiring must be in accordance with the regulation of the National Electric Code, ANSI/NFPA No. 70.

•Unit is approved for installation downstream from refrigeration units. In these conditions, condensate could form in the duct furnace and provision must be made to dispose of the condensate.

Refer to Part Number 460945 for any unit information other than that pertaining to the Indirect Fired Furnace.

1. Single furnaces (furnace input 100 to 400 MBH) have a single 3⁄4 inch connection. Double furnaces (furnace input 500 to 800 MBH) have two 3⁄4 inch connections, and triple furnaces (furnace input 1050 to 1200 MBH have three

⁄4 inch connections.

2. When connecting the gas supply, the length of the run must be considered in determining the pipe size to avoid excessive pressure drop. Refer to a Gas Engineer’s Handbook for gas pipe capacities.

3. A drip leg should be installed in the pipe run to the unit.

4. Install an easily accessible ground joint union and a manual shut off valve (these are required by some local codes) for emergency shut off and easy servicing of the controls.

5. A

⁄8 inch NPT plugged tap shall be installed immediately ahead of the gas supply connection to the furnace.

6. After gas piping is completed, carefully check all piping connections for gas leaks. Use soap solution or equivalent for testing. DO NOT use a flame or other source of ignition to check for gas leaks.

7. When leak testing pressures above 14 in. wg (

⁄2 psi), close the field installed shutoff valve, disconnect the furnace and its gas train from the gas supply line, and plug the supply line before testing.

8. When leak testing at pressures equal to or less than 14 in. wg (

⁄2 psi) close the field-installed shutoff valve to isolate the unit from the gas supply line before testing.

1. Do not install units in locations where flue products can be drawn into adjacent building openings such as windows, fresh air intakes, etc. Distance from vent terminal to adjacent public walkways, adjacent buildings, operable windows, and building openings shall conform with the local codes. In the absence of local codes, installation shall conform with the National Fuel Gas Code, ANSI Z223.1, or the CAN/CGA B-149 Installation Codes.

2. Building materials that will be affected by flue gases should be protected.

3. Avoid locating in an area where deep snow is likely to accumulate. During the winter months, keep snow clear on the access side of the unit to prevent any blockage of combustion air inlet or flue exhaust openings.

4. Maintain minimum horizontal clearance of 4 feet from electric meters, gas meters, regulators, and relief equipment. In Canada, the minimum clearance is 6 feet.

5. Local codes may supercede any of the above provisions.

6. Be sure that the minimum clearances to combustible materials are maintained.

Venting

1. Do not modify or obstruct the combustion air inlet cover or the combustion blower weatherhood.

2. During the winter months, periodically clear snow from access side of unit to prevent blockage of the inlet and exhaust openings.

3. Do not add any vents other than those supplied by the manufacturer.

From

Gas

Gas Cock

1/8 in. Plugged

6 in. Trap

Ground Joint Union

To Controls

Unit Clearances to Combustible Materials

Gas Connection

Figure 1: Recommended Piping to Controls

Location Recommendations

Gas Supply Pressure Requirements

Natural: 6 to 14 in. wg

LP: 11 to 14 in. wg

Combustion blower discharge must be located 42 in. from any combustible materials.

1. Installation of wiring must conform with local building codes. In the absence of local codes, installation must conform to the National Electric Code ANSI/NFPA 70-Latest Edition. Unit must be electrically grounded in conformance with this code. In Canada, wiring must comply with CSA C22.1, Canadian Electrical Code.

2. All furnaces are provided with a wiring diagram located on the inside of the access panel. Refer to this wiring diagram for all wiring connections.

3. The combustion blower motor will not run unless the furnace is turned on and the gas controls are calling for heat.

WARNING!!!

• Disconnect power supply before making wiring connections to prevent electrical shock and equipment damage.

• All appliances must be wired strictly in accordance with wiring diagram furnished with the unit. Any wiring different from the diagram could result in a hazard to persons and property.

• Any original factory wiring that requires replacement must be replaced with wiring material having a temperature rating of at least 105°C.

1. Two-stage temperature controls - Controls the furnace stages based on the unit discharge temperature.

2. Combustion blower - Exhausts the products of combustion from the furnace tubes.

3. Ignition controller - Continually monitors, analyzes, and controls the proper operation of the gas burner.

4. Manifold pressure test port - Used for checking the manifold gas pressure.

5. Time Delay relay - Allows burner to stay at high fire for 10 seconds upon being lit.

6. Air pressure switch - Tests to ensure the combustion blower is operating.

7. Two-stage gas valve - Contains main pressure regulator, safety shut-off valves, and manual shut off knob. It controls the furnace to 50% or 100% fire.

8. Ignitor - Provides spark for burner ignition.

9. Flame Sensor - Ensures that each burner has

ignited.

Control Center Layout

Electrical Connections

Figure 2: Furnace Control Center

+ 5 hidden pages