1. Brush off any accumulation of dust that may be
found.
2. Check manifold gas pressure with a low pressure gas
gauge:
a. Shut off the gas supply to the heater.
b. Disconnect the heater from its electrical supply.
c. Turn the pressure tap at the outlet of the valve
counterclockwise a minimum of one full turn.
d. Connect a low pressure gas gauge to the pressure
tap.
e. Open the fuel supply and reconnect the heater to
electrical supply.
f. Start the heater.
g. When heater lights, the gas gauge will read 25
mbar for LP vapor or 10 mbar for natural gas
pressure. This pressure is the flowing gas
pressure necessary for the heater to deliver its
maximum output. If the gauge does not indicate
proper manifold pressure, check the inlet pressure
to the gas control valve. Maximum and minimum
acceptable inlet pressures to the gas control valve
are shown in the heater specifications table and
also on the heater’s dataplate. The inlet pressure
may need adjustment as necessary to achieve
proper outlet pressure. Inlet pressure is checked
in the same manner as outlet pressure.
h. After pressures have been checked, shut off the
gas supply and electrical supply to the heater,
remove the gauge, and tighten the pressure tap
securely. Open the gas supply and reconnect the
heater to is electrical supply.
FIG. 11
GAS CONTROL VALVE
17
WARNING
Fire and Explosion Hazard
■
Do not disassemble the gas control valve.
■
Do not attempt to replace any components on the gas
control valve.
■
The gas control valve must be replaced if any physical
damage occurs to the control valve assembly.
■
Failure to follow this warning will result in fire or
explosions, leading to injury or death to humans and
livestock, and building damage.
INLET
PRESSURE TAP
OUTLET PRESSURE TAP WITH
PRESSURE GAUGE CONNECTED
