All installations and services must be performed by qualified service personnel.
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NOTE: Class 1 thermostat wire must be used inside the furnace burner
compartment.
a. Insert 24 VAC wires through the plastic grommet on the left side of the
furnace casing.
b. Connect the thermostat wires to the W/R 50A65-143 control (refer to the
wiring diagram).
c. Connect the thermostat wires to the room thermostat.
IMPORTANT:
The room thermostat should be installed 4 to 5 feet above
the floor on an interior wall which is relatively free from direct sources of
heat (sunlight or supply airflow) or exposure to cold (drafts from open
windows and doors). The nominal anticipator setting is 0.8 amperes, for
the VMA (refer to the thermostat literature for additional information).
Four-conductor thermostat wire is recommended for 24 VAC, low-voltage,
control circuit wiring. How ever only 2 wires are required for the furnace (a
heating application only).
Electrical Wire Diameter
Maximum Recommended
Thermostat Wire Length
(AWG)
(Feet)
24
55
22
90
20
140
18
225
Once the furnace is installed, check the thermostat anticipator for proper
nominal setting.
1. Connect a multimeter, capable of reading milliamps (mA), in series
with the low voltage wires to the thermostat.
2. Increase the thermostat setting, or create a “call for heat”.
3. Read the value of the thermostat current, in milliamps.
4. Adjust the heat anticipator of the thermostat to the value read by the
multimeter.
If the heat anticipator is set too high, the furnace may delay activation of a
heating cycle for too long. If the heat anticipator is set too low, the furnace
may cycle too frequently. Either condition may not provide optimal
comfort to the homeowner.
NOTICE:
The hot surface igniter and operation of this furnace depends on
correct polarity. The hot leg of the supply circuit must be connected to the
black
line lead (L1) and the common leg (L2) to the white line lead in the field
