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All installations and services must be performed by qualified service personnel.
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 CMA/CMC (refer to the thermostat literature for additional information).
Four-conductor thermostat wire is recommended for 24 VAC, low-voltage,
control circuit wiring. However, 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.
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