–6– Form
#43219000
Jan 09
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
Minimum
7
Maximum
Natural Gas
3.5” W.C.
4.5” W.C.
14.0” W.C.
RSCA3
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.
RSCA6 and
RSCA10
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: RSCA3-1
RSCA6-1
PILOT
OFF
ON
PILOT
ADJ
OUTLET
INLET
Pilot Gas Outlet
1/8NPT
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)
Pressure Regulator Adjustment
(under cap screw)
1/8 NPT
Inlet Pressure
Tap with 3/16 Hex
Allen Wrench Plug
1/8NPT
Outlet Pressure
Tap with 3/16 Hex
Allen Wrench Plug
Gas Control
Knob
Wiring
Terminals (2)
Ground
Terminals (2)
OUTLET
INLET
CAUTION
Never jumper these terminals. This
shorts out valve coil and may burn
out heat anticipator in thermostat.
GAS CONTROL VALVE
(#VR8205A)
Models: RSCA3-5
RSCA6-5
RSCA10-5
8) ELECTRICAL CONNECTIONS
