Product Manual

–9– Form #43219030
June 09
10) INSTRUCTIONS FOR PRESSURE TEST GAUGE CONNECTION
Supply Pressure
1. The installer will provide a 1/8" N.P.T. plugged tapping, accessible for test gauge connection immediately
upstream of the gas supply connection to the heater.
Manifold Pressure
1. Turn the gas valve to the "OFF" position. Remove the 1/8" plug from the manifold downstream from the
combination gas valve at one of the outlet pressure taps and connect a 1/8" nipple to the tapped hole.
Connect the gauge to the nipple. Turn on the gas supply.
2. With the main burner operating, check the 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 full rate adjustment is
required, remove the cover screw. Using a small screwdriver, turn the adjustment screw clockwise
3 to
increase or counterclockwise
4 to decrease the gas pressure to the burner. Replace the cover screw.
The gas pressures are shown in the following table:
GAS PRESSURE TABLE
Supply Pressure
Model Gas Type Manifold Pressure
Minimum7 Maximum
Natural Gas 3.5” W.C. 4.5” W.C. 14.0” W.C.
SGM3
Propane Gas 10.0” W.C. 11.0” W.C. 14.0” W.C.
Natural Gas 6.0” W.C. 7.0” W.C. 14.0” W.C.
SGM6 and
SGM10
Propane Gas 10.0” W.C. 11.0” W.C. 14.0” W.C.
7 Minimum permissible gas supply pressure for purpose of input adjustment.
Models: SGM3-1
SGM6-1
SGM10-1
PILOT
OFF
ON
PILOT
ADJ
OUTLET
INLET
Pilot Gas Outlet
1/8NPT
Outlet Pressure
Tap with 3/16 Hex
Allen Wrench Plug
(directly beneath)
Powerpile/Thermostat
Connection Terminals
Pilot Flow Adjustment Screw
(beneath cover screw)
Pilotstat
Power Unit
Wrench
Boss
Gas Control
Knob
Pressure Regulator
Adjustment
(beneath cover screw)
Standard
Pressure
Regulator
GAS CONTROL VALVE
(#VS820A)