4.
If the inlet pressure is correct but the burner manifold
pressure does not agree with that specified on the
dataplate, then the pressure regulator internal to the
gas control requires adjustment. Refer to the
following instructions. The burner box will need to be
opened and closed/latched as needed to accurately
set the gas control pressures.
Two Stage Gas Controls
a.
Set the thermostat to its lowest setting. Remove the
cap from the HI and LO heat adjusting screws at the
two stage pressure regulator on the gas control valve.
See Fig. 35.
FIG. 35
b.
Slowly turn up the thermostat until the valve opens in
first stage position. The amber light next to the red
light on the burner box access panel will come on.
Verify first stage outlet pressure according to the
heater’s dataplate. If different than dataplate, the LO
heat setting at the regulator on the gas control
requires adjusting. Turn clockwise to increase, or
counterclockwise to decrease.
c.
Turn the thermostat completely up. The second
amber light will come on. The valve has opened to
second stage and the gas pressure will increase.
Verify second stage gas pressure according to
dataplate. If different, the HI heat regulator must be
adjusted. Turn clockwise or counterclockwise until
proper pressure is achieved.
Single Stage Gas Controls
Set the thermostat to its highest setting. The single
amber light on the burner box panel will come on, and
gas control will open. If manifold gas pessure is
different than dataplate, adjust the internal pressure
regulator clockwise or counterclockwise. See Fig. 36.
FIG. 36
D. Completion
1.
Close the fuel supply valve to the heater and allow
the heater to burn off any remaining fuel.
2.
Disconnect the heater from its electrical supply.
3.
Remove the gauges and associated hardware. Install
plugs in gas control valve and in connector. Tighten
all securely. Close and latch panel. Reconnect air
inlet to burner box if necessary.
4.
Reconnect hose and adapter to sediment trap.
tighten securely.
5
Open fuel supply valve and reconnect electrical
supply to heater. Start the heater and check for gas
leaks. Set thermostat to desired temperature.
22
OUTLET PRESSURE TAP
INTERNAL PRESSURE REGULATOR
GAUGE AT VALVE OUTLET
GAUGE 00764
LO
HI
GAS CONTROL
OFF
ON
OUTLET
PRESSURE
TAP
