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.
R
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
3
⁄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
1
⁄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 (
1
⁄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 (
1
⁄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.
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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
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2
3
4
5
6
7
8
9
Electrical Connections
Figure 2: Furnace Control Center
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