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The combustion products outlet must be located at least 4 feet (1.22 m) below, 4 feet (1.22 m) horizontally from or 1
foot (0.3 m) above any door, window, walkway or gravity air inlet to the building. The outlet must be located at least 10
feet (3.05 m) away from any forced air inlet and at least 3 feet (0.91 m) outside any overhang.
The combustion air inlet on the unit top must be located at least one foot (0.30m) above grade and at least one foot
(0.30m) above normal snow levels.
Flue gas condensate can freeze on exterior walls or on the vent cap. Frozen condensate on the vent cap can result in
a blocked flue condition. Some discoloration to exterior building or unit surfaces is expected. Protect adjacent brick or
masonry surfaces with a rust resistant sheet metal plate.
A snow fence, screen or other provisions must be installed to prevent snow and ice accumulation around the appliance
and its venting system.
GAS SUPPLY AND PIPING
Verify that the type of gas specified on rating plate is supplied to the unit. This unit is orificed for operation up to 2000
feet altitude. Appliance btuh output derates 4% per 1000 feet above 2000 feet elevation. Consult Factory for
installations above 2000 feet elevation.
Inlet Pressure: Measured at the inlet pressure tap located at the main gas cock. The inlet pressure must remain within
the minimum and maximum values while the unit is at rest and while the unit is operating at maximum firing rate.
Manifold Pressure: Measure at the pressure tap on the downstream side of the final manual shutoff valve for each
stage of operation. The rated manifold pressure for each stage appears on the data label located on the left side of the
appliance jacket. Factory test pressures appear on a label affixed to the jacket inside the unit top and adjacent the
combustion air inlet opening. Maximum manifold gas pressure must not exceed the value specified. Minimum value
listed is for the purposes of input adjustment. The manifold pressure is preset at the factory and adjustment is not
usually required. If adjustment is required, the burner must be firing at the minimum and/or full rate while the manifold
pressure is adjusted.
SINGLE UNIT INSTALLATIONS SUGGESTED
GAS PIPE SIZE
Distance from Meter (In feet)
BTU
INPUT
0-50'
51-100'
399,000
1 ¼"
1 ¼"
540,000
1 ¼"
1½"
750,000
1½"
2"
1,000,000
2"
2"
1,200,000
2"
2½"
1,600,000
2½"
2½"
2,000,000
2½"
3"
Use the values in "Convert Fittings To Equivalent Straight Pipe" to add the equivalent straight pipe for each elbow or tee to
obtain the total distance from the meter. Use this corrected total distance from the meter for determining the suggested pipe
size in the "Single Unit Installation Suggested Gas Pipe Size" table.
Appliance Isolation During Gas Supply Piping Pressure Test
1.
The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any
pressure testing of that system at test pressures in excess of ½ PSI (3.5 kPa).
2.
The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during
any pressure testing of the gas supply piping system at test pressures equal to or less than ½ PSI (3.5 kPa).
3.
The appliance and its gas connection must be leak-tested before placing it in operation.
OUTDOOR INSTALLATION
101-200'
201-300'
301-500'
1½"
1½"
2"
2"
2"
2½"
2"
2½"
3"
2½"
2½"
3"
2½"
3"
3"
3"
3"
3½"
3"
3½"
4"
Inlet Pressure
Max. (Inches-Water Column)
Min. (Inches-Water Column)
CONVERT FITTINGS TO EQUIVALENT STRAIGHT PIPE
Diameter Pipe
¾"
(inches)
Equivalent Length
of Straight Pipe
2'
(feet)
9
Nat. Gas
10.5"
4.5"
1"
1¼"
1½"
2"
3"
2'
3'
4'
5'
10'
34-50 04/02/2010
LP
13"
11"
4"
5"
14'
20'
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