Mr. Heater MHU 50 Operating Instructions And Owner's Manual page 16

Honeywell
Figure 2
See Figure 2
Step 7
Remove valve pressure test plug and retain for later use. Connect a
Step 7
water-filled U-tube manometer to the test port. See Figure 2. Use
Reconnect main power supply, and turn main gas supply on.
a manometer because test gauges are not reliable and may give a
false reading.
Step 8
Step 8
Turn up thermostat to call for heat.
Connect main electrical power supply, and turn main gas supply on.
Step 9
Step 9
When burner lights, set the manifold gas pressure by turning the
Turn up the thermostat to call for heat, thereby starting the ignition
adjustment screw that holds the regulator spring that was replaced
sequence for the heater.
in step 6, of the unit covers.
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
Decrease Pressure
6. Once the has been adjusted, replace the adjustment screw cover
Counter Clock Wise
with a new one from the conversion kit.
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.
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.
Increase Pressure
Clock Wise
Compact Unit / Utility Heater
6
5
4
3
2
1
4"
0
1
2
3
4
5
6
N.G.
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.
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.
16
Operating Instructions and Owner's Manual
6
5
4
3
2
1
10.5"
0
1
2
3
4
5
6
L.P.