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14.0)
INSTRUCTIONS FOR PRESSURE TEST GAUGE CONNECTION
SUPPLY PRESSURE
1. The installer will provide a 1/8" N.P.T. tapped plug, accessible for test gauge connection immediately upstream
of the gas supply connection to the heater.
MANIFOLD PRESSURE– COMBINATION GAS VALVE IS FACTORY SET
Two-stage valves require that you check and adjust both high and low pressure regulator settings.
1. Turn the gas valve to the "OFF" position. Remove the 1/8" plug from the combination gas valve at the outlet
pressure tap and connect a 1/8" nipple to the tapped hole. Connect the gauge to the nipple. Turn on the gas
supply.
2. Set the heater to operate on high. With the main burner operating, check the full rate (high) burner manifold
pressure using a water manometer. Gauges that measure pressure in pounds per square inch are not accurate
enough to measure or set the manifold pressure. All measurements MUST BE made when this heater and all
other gas burning equipment that is connected to the gas supply system are operating at maximum capacity.
3. The combination gas valve is factory set and should not require adjustment. If high pressure adjustment is
required, remove the pressure regulator adjustment cap. Using a 3/32" hex Allen wrench, turn the inner
adjustment screw for HI pressure clockwise
to the burner.
4. After high pressure has been checked, check low pressure regulation.
5. Using a 3/32" hex Allen wrench, turn the inner adjustment screw for LO pressure clockwise
counterclockwise
to decrease the gas pressure to the burner.
6. Once high and low pressures have been checked and adjusted, replace pressure regulator adjustment cap.
Gas pressures are shown in the table below.
MANIFOLD PRESSURE
GAS TYPE
High
Natural Gas
3.5" W.C.
Propane Gas
10.0" W.C.
* Minimum permissible gas supply pressure for purpose of input adjustment.
to increase or counterclockwise
GAS PRESSURE TABLE
Low
Minimum*
1.4" W.C.
5" W.C.
4.0" W.C.
11" W.C.
–30–
to decrease the gas pressure
SUPPLY PRESSURE
Maximum
14" W.C.
14" W.C.
to increase or
Form #43343530
JJuly 08
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