Fuel Conversion Manual
Compact Unit Heater
e-5
Figure 2
See Figure 2
step 7
Reconnect main power supply, and turn main gas supply on.
step 8
Turn up thermostat to call for heat.
step 9
When burner lights, set the manifold gas pressure by turning the
adjustment screw that holds the regulator spring that was replaced
in step 6, of the unit covers.
Decrease Pressure
Increase Pressure
Counter Clock Wise
Clock Wise
The Natural Gas unit should be set to (4” W.C.) and the LP unit
should be set to (10” W.C.). The manometer illustration
(See Figure 2) shows each of the pressure readings.
step 10
Turn down thermostat, disconnect main power, and turn main gas
off to appliance.
step 11
Disconnect manometer from appliance and replace test plug on
valve.
step 12
Connect main power, turn main gas back on, and turn up
thermostat to call for heat. When main burner lights check all
connections thoroughly for gas leaks.
Allow the heater to operate for at least 5 minutes, then observe
the main burner flame. A hard blue flame extending into the
tube is normal. Slight yellow tipping is acceptable. There is no air
adjustment on burner.
n.G.
l.P.
6
5
4
3
2
1
0
1
2
3
4
5
6
6
5
4
3
2
1
0
1
2
3
4
5
6
4"
10"
Honeywell
step 7
Remove valve pressure test plug ② and retain for later use. Connect a
water-filled U-tube manometer to the test port. See Figure 2. Use a
manometer because test gauges are not reliable and may give a false
reading.
step 8
Connect main electrical power supply, and turn main gas supply on.
step 9
Turn up the thermostat to call for heat, thereby starting the ignition
sequence for the heater.
step 10
When the burners light, set the manifold gas pressure by turning the
adjustment screw to the regulator spring that was replaced in step
6. Once the has been adjusted, replace the adjustment screw cover
with a new one from the conversion kit.
The Natural Gas unit should be set to 4” WC and the LP unit should
be set to 10”WC. The manometer illustration (See Figure 2) shows
each of the pressure readings.
step 11
Turn down the thermostat and allow the heater to complete a cool
down cycle. Then disconnect main electrical power, and turn the
main gas supply off to appliance.
step 12
Disconnect the manometer from appliance and replace the test plug
on valve removed in step 6.
