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WARNING: DISCONNECT THE ELECTRICAL POWER BEFORE SERVICING
Wiring
The appliance, when installed, must be electrically grounded in accor-
dance with local codes or, in the absence of local codes, with the
National Electrical Code, ANSI/NFPA 70 or Canadian Electrical Code,
CSA C22.1, if an external electrical source is utilized. This appliance
is equipped with a three-prong [grounding] plug for your protection
against shock hazard and should be plugged directly into a properly
grounded three-prong receptacle. Do not cut or remove the ground-
ing prong from this plug. For an ungrounded receptacle, an adapter,
which has two prongs and a wire for grounding, can be purchased,
plugged into the ungrounded receptacle and its wire connected to the
receptacle mounting screw. With this wire completing the ground, the
appliance cord plug can be plugged into the adapter and be electrically
grounded.
CAUTION: Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous opera-
tion. Verify proper operation after servicing.
Note: For testing flame sensor circuit use a micro-amp meter in series
with sensor. Minimum current should be 1 micro-amp during operation.
Be careful as flame sensor is in the 115VAC circuit. If current is below
1 micro-amp, remove sensor, clean with light sandpaper and retest.
Note: This heater is equipped with a remote bulb electronic thermistor
control located down low at the back of the furnace. Sometimes due to
field locations different air currents may effect the control sensing of the
thermistor. This sensing bulb can be re-located if necessary to provided
R-3119
WIRING DIAGRAM
for better room air sensing and control.
Replacement of Thermistor with 24 Volt Wall Thermostat
1. If furnace is installed, turn off gas supply and electric supply.
2. Remove casing front.
3. Remove black hose from front nipple on pressure switch.
4. Remove junction box cover (4 screws).
5. Please refer to wiring diagram for removal of the following wires.
6. Internal Electronic Thermostat/Temperature Control Board
Attention! No 24 volt wall thermostat wires are to be attached
7. Control Board
A. Remove white wire form screw marked W.
B.
C.
8. Route (2) wires from any 24 volt wall thermostat through the
casing back of furnace to the screws marked W and R on the
control board.
9. Replace junction box cover (4 screws).
10. Replace black hose onto front nipple on pressure switch.
11. Replacement of thermistor with 24 volt wall thermostat is com-
pleted.
to the internal electronic thermostat.
Remove yellow wire from screw marked C.
Remove red wire from screw marked R.
Page 11
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