Ventilation; Start-Up Procedure; Operator Maintenance Instructions - Mr. Heater MH40NG Operating Instructions And Owner's Manual

Connect the thermostat wires to gas valve as shown in Figure 4.
THeRMoSTAT
Figure 4 connection diagram

9. VENTILATION

a. The minimum intake and exhaust air openings shall provide
for not less than 400 CFM for every 100,000 BTU input except
that the infiltration area may be included in the intake area.
b. Where natural (gravity) ventilation is provided for exhaust, the
openings must be distributed above the heaters (preferably at
the peak of the roof) and the areas of openings shall not be
less than 300 square inches for every 100,000 BTU input.

10. START-UP PROCEDURE

oPeN THe GAS SUPPLY VALVe oR VALVeS.
Figure 5. Thermostate controls
Set the thermostat to the oFF position. See Figure 5. If the
manual gas control knob on the gas valve is not in the oFF
position, partially depress the knob and rotate to the oFF position.
See Figure 6.
Wait 5 minutes to allow gas that may have accumulated in the
main burner to escape (especially important after installation).
Turn the manual gas control knob to the PILoT position.
Depress the manual gas control knob. Using a match, light the
pilot light. See Figure 6. Hold the knob down for approximately
30 seconds to allow any air in gas lines to pass through pilot and,
once the pilot is lit, allow the thermocouple to heat up enough to
activate the safety valve in an open position.
PoWeRPILe GAS VALVe
PoWeRPILe GeNeRAToR
E5
Model # MH40NG/LP
MANUAL GAS
CoNTRoL KNoB
WReNCH
BoSS
GAS INLeT
PILoTSTAT PoWeR
UNIT
Figure 6. Gas Valve
Components
Release manual gas control knob and turn to oN. Reset
thermostat to desired temperature.
NOTE:
During the initial startup of MR. HeATeR an odor and, perhaps,
some vapor will come from the heater. This is the gasket binding
material emitting this odor and/or vapor. After approximately 20
minutes this odor will disappear and not occur again.
11. SHUTDOWN
1. Turn thermostat to oFF.
2. Turn manual gas control knob on gas valve to PILoT position.
3. Partially depress knob and rotate to the oFF position.
4. Close gas supply valves.
12. OPERATOR MAINTENANCE
INSTRUCTIONS
1. TROUBLESHOOTING
a. Table 4 lists the common malfunctions which you may find
during the operation or maintenance of your heater.
b. For additional information refer to Honeywell Field Bulletin
enclosed in the heater carton.
c. In the event, results cannot be obtained after performing all
listed solutions, call your Mr. Heater dealer, or the factory
customer service department at 1-800-251-0001.
2. ADJUSTING THE PILOT FLAME
The pilot flame should envelope 3/8 to ½ in. (10 to 13mm) of the
tip of the thermocouple or generator. To adjust the pilot flame,
PRoPeR FLAMe ADJUSTMeNT
Figure 7. Proper flame adjustment
Installation Instructions and owner's Manual
PReSSURe ReGULAToR
ADJUSTMeNT
STANDARD
PReSSURe
ReGULAToR
(Incoming pressure
not exceed 13" W.C.)
PILoT GAS
oUTLeT
(PReSSURe
TAPPING
DIReCTLY
PILoT FLoW
BeNeATH)
ADJUSTING
SCReW
(BeNeATH
CoVeR SCReW)
3/8 To ½ INCH
(10 To 13 MILLIMeTeRS)
THeRMoCoUPLe