Part #461006
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Installation, Operation and Maintenance Manual
Installation, Operation and Maintenance Manual
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the
product described. Protect yourself and others by observing all safety information. Failure to comply with instructions
product described. Protect yourself and others by observing all safety information. Failure to comply with instructions
could result in personal injury and/or property damage! Retain instructions for future reference.
could result in personal injury and/or property damage! Retain instructions for future reference.
Indirect Gas-Fired Furnaces
Model PVF
General Safety Information
Model PVF Indirect Gas Furnace, available in Energy
Recovery models ERH, ERCH, HRE and VersiVent.
For unit specific information, refer to the respective
Installation, Operation and Maintenance Manual.
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 does.
• All electrical wiring must be in accordance with
the regualtion of the National Electric Code, ANSI/
NFPA 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.
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage,
injury or death. Read the installation, operating
and maintenance instructions thoroughly before
installing or servicing this equipment.
Table of Contents
Installation
Location . . . . . . . . . . . . . . . . . . . . . . . 3
Venting for Outdoor Units. . . . . . . . . . . . . . 3
Venting for Indoor Units. . . . . . . . . . . . . . . 3
Standard Indoor Venting . . . . . . . . . . . . . . 4
Furnace Connection Locations . . . . . . . . . . . 5
Concentric Venting . . . . . . . . . . . . . . . . 6-7
Two Pipe Venting . . . . . . . . . . . . . . . . . 8-9
Electrical Wiring . . . . . . . . . . . . . . . . . . .10
Furnace Control Center Layout. . . . . . . . . . .10
Gas Piping . . . . . . . . . . . . . . . . . . . . . .11
Start-Up Operation
Start-Up, General . . . . . . . . . . . . . . . . . .12
Furnace Controls . . . . . . . . . . . . . . . . 12-13
Sequence of Operation. . . . . . . . . . . . . .14
Performance Data . . . . . . . . . . . . . . . . .14
Troubleshooting . . . . . . . . . . . . . . . . . .15
Routine Maintenance . . . . . . . . . . . . . . .16
Model PVF Indirect Gas-Fired Furnace
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Installation – Location
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.
7. To prevent premature heat exchanger failure, do
not locate units where chlorinated, halogenated,
or acid vapors are present.
8. Units must not be installed in a potentially
explosive, flammable, or corrosive atmosphere.
For additional information on installation of the energy
recovery unit, refer to the respective units Installation,
Operation, and Maintenance (IOM) manuals:
Unit Clearances to Combustible Materials
Outdoor
Indoor
Combustion blower discharge must be located
42 inches from any cmobustible materials
Clearances are determined by the National Fuel
Gas Code and/or other local codes.
Installation of Venting for Outdoor
Units
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.
Installation of Venting for Indoor
Units
There are three venting methods for indoor mounted
units. For each method, the units can be vented
horizontally through an exterior wall or vertically
through the roof. Specific venting instructions are
provided for each method and shown in the following
pages. Construct the vent system as shown in these
instructions. Refer to your unit specific submittal to
determine the applicable venting option.
The venting method options are:
Standard Indoor Venting
• uses building air for combustion
• vents exhaust to outdoors
• one exterior roof or wall penetration
Separated Combustion Concentric Venting
• uses outside air for combustion
• vents exhaust to outdoors
• one exterior roof or wall penetration
Separated Combustion 2-Pipe Venting
• uses outside air for combustion
• vents exhaust to outdoors
• two exterior roof or wall penetrations
The following guidelines must be adhered to for all
indoor units:
1. Venting installation must conform with local
building codes. In the absence of local codes,
installation must conform with the National Fuel
Gas Code, ANSI Z223.1 or in Canada, CAN/
CGA-B149 installation codes.
2. For Standard Indoor Venting, use exhaust pipe
approved for a category III appliance or single
wall, 26 gauge or heavier galvanized vent pipe.
The piping is required to be gas tight by ANSI.
3. For Separated Combustion venting, sealed singlewall galvanized air pipe is recommended.
4. The joints must be sealed with a metallic tape or
silastic suitable for temperatures up to 350ºF.
5. A minimum of 12 inches of straight vent pipe is
recommended after the exhaust connection and
before any elbows.
6. Vertical combustion air pipes should be fitted with
a tee, drip leg, and clean-out cap to prevent any
moisture in the combustion air pipe from entering
the unit. The drip leg should be cleaned out
periodically during the heating season.
7. To reduce condensation, insulate any vent runs
greater than 5 feet.
8. All vent pipe connections should be made with at
least three corrosion resistant sheet metal screws.
9. Refer to the National Fuel Gas Code for additional
piping guidelines.
NOTE
Vent piping is supplied by others, not Greenheck.
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NOTE
Vent piping is supplied by others, not Greenheck.
Model PVF Indirect Gas-Fired Furnace
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Installation of Standard Indoor
Venting
Standard Indoor Venting uses one penetration through
an exterior wall or roof for venting the flue exhaust.
The combustion air is scavenged from the air inside
the building (no piping required). When units are
installed in tightly sealed buildings, provisions should
be made to supply an adequate amount of infiltration
air from the outside. The rule of thumb is that an
opening of one square inch should be provided for
every 1000 BTUs per hour of input rating.
Vent terminals must be used (one vent terminal
included with each furnace). Construct the vent
system as shown in the Horizontal and Vertical
drawings below and reference the Vent Pipe Diameter
table for the correct vent pipe diameters.
A = 12 in. minimum
Exterior
Wall
A
EXHAUST
Air Inlet
Exhaust
Vent
Terminal
Pitch vent pipe
downward from
furnace
1/4 inch per foot
Vent Length Limitations
Refer to table for minimum and maximum vent
lengths. The total equivalent vent length must include
elbows. The equivalent length of a 4 inch elbow is
6 feet and the equivalent length of a 6 inch elbow is
10 feet.
Vent
Length
Horizontal 5 70
Vertical 10 70
Minimum
(feet)
Maximum
(feet)
Vent Pipe Diameter
Select the vent pipe diameter. Use only the specified
pipe size.
Furnace
Size
(MBH)
100 - 150 4 6
200 - 400 6 8
Exhaust
(inches)
Combustion
(inches)
Installing Exhaust Vent Pipe
Install the vent pipe with a minimum downward slope
(from the unit) of 1/4-inch per foot (horizontal venting
only). Securely suspend the pipe from overhead
structures at points no greater than 3 feet apart.
Attach the vent terminal to the end of the exhaust
pipe.
Seal Opening
Using an appropriate method, seal the wall/roof
opening around the exhaust pipe.
Standard Indoor Venting - Horizontal
Roof Line
B
EXHAUST
A
Air Inlet
A = 12 inch minimum
B = 12 inch minimum but
should size according to
expected snow depth
Exhaust Vent
Terminal
Standard Indoor Venting - Vertical
Model PVF Indirect Gas-Fired Furnace
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Furnace Connection Locations
Model ERH, ERCH, HRE
C
B
Combustion Air Inlet
Exhaust Outlet
F
E
D
A
3/4 inch
Gas Connection
Furnace Connection Locations
Model VersiVent
Exhaust Outlet
3/4 inch
Gas Connection
C
A
B
D
ERH
ERCH
HRE
20
45
45
55
55
90
Furnace
(MBH)
100-150 23.75 24.438 24.438 3.75 10.50 16.625
100-150 23.75 24.50 24.50 6.00 12.75 18.875
200-250 23.75 23.50 24.125 6.00 25.125 32.25
150 26.63 27.25 27.25 6.00 12.75 18.875
200-300 26.63 26.38 27.00 6.00 22.50 29.63
300-400 37.63 37.38 38.00 6.00 25.00 32.125
A B C D E F
VersiVent
45
45, 65
45, 65
45, 65, 90
45, 65, 90
45, 65, 90
45, 65, 90
Furnace
(MBH)
75 19.587 14.372 15.638 18.083
100 19.587 14.372 15.638 18.083
150 8.092 13.872 12.838 19.208
200 8.092 13.872 12.838 19.208
250 8.092 13.872 15.686 19.208
300 8.092 13.872 17.709 19.208
350-400 8.092 13.372 21.838 19.208
A B C D
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Model PVF Indirect Gas-Fired Furnace
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