Thermostat or wall switch installation
The burner control switch is located in the center of the control department opening. For your convenience,
the unit can also be operated by a thermostat or a wall switch control. Millivolt thermostats are available from
any authorized CFHM dealer. Please note, bedroom installations require the use of a wall thermostat.
Mount the thermostat or switch in the desired location and run “two conductor thermostat wires” to the
heater’s lower right hand corner, close to the gas supply line.
Thermostat Installation
Thermostat Wire Information
AWG
22
20
18
16
14
mm
0.6
0.8
1.0
1.3
1.6
Ft
.
10
25
40
64
100
M
3.0
7.6
12.2
19.5
30.5
Note: The thermostat or wall switch MUST be rated for millivolt use.
Minimize splicing in all millivolt wiring and solder all unavoidable splices.
Flame Quality Adjustment
Air adjustment tab is located just above the valve, which is attached to the valve tray. This
venturi adjustment allows for fine tuning of the flame characteristics which may vary due to
climate, altitude, and venting differences.
Flames Types
1. Blue at the base and
light orange above.
Medium height (ideal)
2. Mostly blue with little or
no orange
Adjustment
None
Pull Out
Push In
WARNING: Incorrect adjustment of flame can lead to
improper combustion which can be a safety hazard.
Page 15
Thermopile
Thermocouple
Electrode
Pilot Flame
Pilot Checks: A periodic check of the pilot and burner flames should be made. Check after
the fire has been on for at least 30 minutes. The pilot flame must cover the tip of the
thermocouple and thermopile probes, if the pilot flame does not sufficiently cover the
probes it can be adjusted using the pilot adjustment screws found on the front of the gas
valve. The main burner flame patern will vary from appliance to appliancedepending on the
type of installation and climatic conditions.