EMI CAC User Manual
Page 14
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CAC Cassette Evaporator
14
LOW VOLTAGE INTERCONNECT WIRING
Depending on the thermostat required or
selected, cooling only air handlers may
utilize three to five low Voltage intercon-
necting wires between the indoor unit,
thermostat and the outdoor unit. Some
thermostats do not require the use of the
“C” (brown) connection. In this case, en-
sure that any unused wires are insulated
to prevent them from making contact with
the junction box or other metal surfaces.
If the indoor unit has electric heat then a
“W” connection is required between the
thermostat and the indoor unit.
Refer to low Voltage interconnect dia-
gram Figure 1 for remote wall thermostat
controls.
3. On models 18-36, check that the motor-
ized vane sweep functions correctly by
toggling the function on or off, via the
toggle switch on the side of the electri-
cal box.
Toggle Switch
NOTE: Apply power to the Condens-
ing Unit’s crankcase heater for 24
hours before start up to boil off any
liquid that may be present in the
compressor.
1. After 24 hours, the compressor should
be isolated by removing the connection
at the “Y” terminal on the outdoor unit.
Main power can now be applied to the
indoor and outdoor units. A system elec-
trical check can now be carried out.
2. Switch on the indoor Cassette unit and
check that the fan cycles correctly.
4. For units with electric heat, check the
operation of the heat elements by
switching the system to the heating
mode and set the room temperature
above the set point.
5. Ensure that the Condensing Unit start
up procedure has been carried out as
detailed in the corresponding installa-
tion manual.
6. The compressor signal “Y” (disconnect-
ed in step 1) can now be reconnected
and main power applied to the outdoor
unit.
START -UP FOR WALL THERMOSTAT CONTROL
Figure 1
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