4
4
TYPICAL WIRING DIAGRAMS
CAUTION:
Be sure to disconnect the power to the control transformer before removing or installing thermostat.
Do not short gas valve(s), fan, heat relay(s), or cool relay(s)... even momentarily. This will blow a non-
replaceable fuse.
Do not attempt to hook up to live circuits. An accidental connection to a component on the thermostat circuit
board could cause damage to the thermostat.
Figure 4 - Thermostat power-up for test or demonstration purposes
NOTE: As a convenience to the installer, the compressor start up protection delay can be canceled. To cancel
the delay, press the Prog key 3 times, then press the Fan key 2 times.
POWER UP
1.
Double check wiring, be sure that there are no stray wires or wire strands at the connections.
2.
It is not necessary to connect the remote system (COMM) cable at this time.
3.
Connect power to the transformer and system. The display will show all segments for about 5 seconds.
4.
Press the Fan key. The fan should come on. Press the Fan key again. The fan should go off.
5.
Press Hold to override Energy Efficient Control routines.
6.
Set the Mode to "HEAT". Use the up arrow key to raise the desired temperature setting 1 degree above
the current temperature. Ensure that Stage 1 heat comes on. After a few minutes, raise the desired
temperature 3 degrees over the current temperature. Stage 2 heat should come on. Set the mode to
"OFF". Ensure that the heat unit goes off.
7.
Set the Mode to "COOL". Use the down arrow key to lower the desired temperature setting 1 degree
below the current temperature. Ensure that Stage 1 cool comes on. After a few minutes, lower the
desired temperature 3 degrees below the current temperature. Stage 2 cool should come on. Set the mode
to "OFF". Ensure that the cooling unit goes off.
If the thermostat or system does not perform as stated above, recheck all wiring - See Troubleshooting Tips.
Summary of Contents for OMNISTAT RC-122
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