All installations and services must be performed by qualified service personnel.
7
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WARNING:
Heat exchanger oil will burn off on
initial firing creating an unpleasant odor. To prevent
this odor from occurring more than once, it is
suggested that:
1. A window(s) is opened.
2. The thermostat is set at highest setting.
3. The furnace remains running at conditions 1&2
for 30 minutes or until odor has dissipated.
ADJUSTMENT OF HEAT INPUT RATE:
This furnace is shipped from the factory for use with
natural gas a Propane gas Conversion Kit is included;
follow the instructions provided with the Conversion Kit if
the gas supply is Propane gas.
The orifices for this furnace were sized: 1) for natural
gas having a heating value of 1025 BTU per cubic foot
and a specific gravity of 0.65, or for liquefied propane
gas with a heating value of 2500 BTU per cubic foot and
a specific gravity of 1.55. The rating label inside the
furnace vestibule will specify which gas your furnace is
orificed for.
If the furnace is installed at an altitude that is more than
2,000 feet above sea level, it is mandatory the input to
the burner be reduced approximately 4.0% for every
1,000 feet that it is above sea level. Refer to Table 3 for
the proper orifice size at the various altitudes. If the
furnace is installed at an elevation of 2,000 feet or less,
no reduction in input is required. Your gas supplier may
supply you with the correct orifice, or contact Thermo
Pride Technical Service @ 1-800-348-5130 to obtain.
To check the heat input rate of your natural gas furnace,
allow the unit to operate for 10 to 15 minutes and
proceed as follows:
Call your gas supplier and ask for the BTU content
(heating value) of one cubic foot of the gas, supplied to
the installation area. An alternate approach is to
assume a value of 1025 BTU/Cu Ft, which is the national
average.
With all other gas appliances turned off and using a
stopwatch, clock the time required for the (small) dial on
the gas meter to make one full revolution. The meter
dial will state the cubic feet of flow for one revolution
usually one, two or five.
High Altitude Deration Chart
Elevation
(Feet)
Natural Gas
Propane Gas
GM*1-60
GM*1-75
GM*1-60
GM*1-75
0-2,000
#28
#22
#43
#39
2,001-
3,000
#30
#26
2.10mm
#42
3,001-
4,000
#30
#27
#45
2.30mm
4,001-
5,000
1/8”
#28
2.00mm
#43
5,001-
6,000
#31
#29
1.95mm
2.20mm
6,001-
7,000
#31
#29
#48
2.15mm
7,001-
8,000
#32
#30
#49
#45
8,001-
9,000
#33
1/8”
#50
2.00mm
9,001-
10,000
#35
#31
#51
1.95mm
TABLE 3
FORMULA:
/
=
!" #$%/ℎ'
EXAMPLE:
( )*
/
)
+ .-
= 76,678 #$%/ℎ'
Check the model number of the furnace, the input rate,
the type of gas, and the manifold pressure on the rating
label located in the burner vestibule. The calculated BTU
input should be within ± 2% of the furnace rating.
Make sure that the gas supply pressure to the furnace is
within the allowable range of 5.5" to 14" WC pressure on
natural gas and 11.0" to 14.0" WC on propane gas. The
pressure to the furnace must be checked while the
furnace burner and any other gas appliances on the
same supply system are operating. Pressure Bosses,
which accepts 5/16” ID hose) on the gas valve are used
for inlet & outlet (manifold) pressure measurement. The
port is opened with 3/32” hex key, see Figure 7.
GAS PRESSURE CHART FOR ALL GMA1 /
GMC1 MODEL FURNACES
SUPPLY
PRESSURE
MANIFOLD
PRESSURE
NAT
MAX 14” WC
MIN 5.5” WC
3.5 + .3” WC
PROPANE
MAX 14” WC
MIN 11” WC
10.0” + .3” WC
TABLE 4
This gas furnace is equipped with a fixed orifice sized for
the manifold pressure shown on the rating label. The
input can only be increased, or decreased, by adjusting
the manifold pressure. Locate the outlet pressure boss
(see Figure 7) on the gas valve, back the outlet pressure
test screw out one turn counterclockwise, not more than
one turn. Use a U tube manometer or recently
calibrated pressure gage to measure the pressure. To
adjust the pressure, remove the screw cap from the
regulator on the gas valve and using the adjustment
screw. Decrease the pressure by turning the screw
counterclockwise or increase it by turning the screw
clockwise.
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CAUTION:
ADJUSTMENTS TO THE LISTED
PRESSURE MUST NOT EXCEED 0.3" WC. A 0.3" WC
adjustment will increase or decrease the input
approximately 4.0%.
Replace screw (cap) when adjustment is complete. The
correct input can be assumed if the furnace manifold
pressure is the same as that shown on the rating label if
a gas meter is not available for natural gas or the unit is
installed on an unmetered propane gas supply. Shut off
the gas supply to the furnace. Remove the pressure
gage and re-tighten the outlet pressure test screw. If the
rated input cannot be obtained with the present orifice at
the correct pressure, your local gas supplier may assist
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