Form 43343350
-34-
Oct 2013
HI-LO
Adjustment Screws
(use 3/32 Hex
Allen Wrench)
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 (3)
Ground
Terminals (2)
OUTLET
INLET
CAUTION
Never jumper these terminals. This
shorts out valve coil and may burn
out heat anticipator in thermostat.
TWO-STAGE
GAS CONTROL VALVE
HI
LO
ON
OFF
LO
C
HI
Electric
Solenoid
Coil
Regulator
Vent Cover
2-STAGE CONTROLS
2.
With the main burner operating, check the burner manifold pressure using a water column 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
MUST BE
MUST BE
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
The combination gas valve is factory set and
The combination gas valve is factory set and
The combination gas valve is factory set and should not require adjustment.
should not require adjustment.
should not require adjustment.
should not require adjustment. If full rate adjustment is
required, remove the cover screw. Using a small screwdriver, turn the adjustment screw clockwise
to
increase or counterclockwise
to decrease the gas pressure to the burner. Replace the cover screw. NOTE:
NOTE:
NOTE:
NOTE:
The step opening pressure of this gas valve is not adjustable.
The step opening pressure of this gas valve is not adjustable.
The step opening pressure of this gas valve is not adjustable.
The step opening pressure of this gas valve is not adjustable.
4.
Check the burner at step pressure, observing burner ignition and flame characteristics. The burner should
ignite properly and without flashback to the orifice, and should remain lit.
GAS PRESSURE TABLE
GAS PRESSURE TABLE
GAS PRESSURE TABLE
GAS PRESSURE TABLE
GAS TYPE
GAS TYPE
GAS TYPE
GAS TYPE
MANIFOLD PRESSURE
MANIFOLD PRESSURE
MANIFOLD PRESSURE
MANIFOLD PRESSURE
SUPPLY PRESSURE
SUPPLY PRESSURE
SUPPLY PRESSURE
SUPPLY PRESSURE
Minimum*
Minimum*
Minimum*
Minimum*
Maximum
Maximum
Maximum
Maximum
Natural Gas
3.5” W.C.
5” W.C.
1
14” W.C.
Propane Gas
10.0” W.C.
11” W.C.
2
14” W.C.
* Minimum permissible gas supply pressure for purpose of input adjustment.
1
7” W.C. for Models 150-200
2
12” W.C. for Model 200
