Thermo Pride CLQS1-050T36N Installation And Operation Manual page 50

All installations and services must be performed by qualified service personnel.
Fuel Gas Type
Operating Mode and
Model Series
Normal Manifold
Pressure (in. W.G.)
Maximum Gas Supply
Pressure (in. W.G.)
Minimum Gas Supply
Pressure (in. W.G.)
This gas furnace is equipped with a fixed orifice sized for the manifold pressure shown on the information
plate. The input should only be increased or decreased by adjusting the manifold pressure. Remove the
1/8" threaded pipe plug located on the manifold and connect a U-Tube manometer or pressure gage to
measure the pressure.
To adjust the pressure, remove the regulator cover screw from the regulator on the outlet side of the gas
valve and using the adjustment screw, Refer to Figure 15, decrease the pressure by turning the screw
counterclockwise or increase it by turning the screw clockwise. ADJUSTMENTS TO THE LISTED
PRESSURE MUST NOT EXCEED THE VALUES IN TABLE 4. Replace cover screw when
adjustment is complete. The correct input can be assumed if the furnace manifold pressure is the same as
that shown on the information label if a gas meter is not available for natural gas, or the unit is installed
on liquefied petroleum gases which are not metered.
Shut off the gas supply to the furnace. Remove the pressure gage and re-install the pipe plug using a
thread compound resistant to the action of Liquefied Petroleum gases. If the rated input cannot be
obtained with the present orifice at the correct pressure, your installer should contact Thermo Products to
assist in sizing the proper orifice. Our Engineering Department will gladly assist in sizing the orifice if you
provide them with the heating value in BTU per cubic foot and the specific gravity of the gas.
GAS PRESSURE CHART FOR ALL CLQS1 MODEL FURNACES
Propane
High Fire
10.0 ± 0.3
14
11
TABLE 4
Figure 15
48
Natural
High Fire
3.5 + 0.0 / -0.5
14
4.5