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
Figure 1
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to prevent them from making contact with
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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.
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START -UP FOR WALL THERMOSTAT CONTROL
Refer to low Voltage interconnect dia- | Toggle Switch |
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gram Figure 1 for remote wall thermostat |
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controls. |
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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.
3.On models
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.
CAC Cassette Evaporator | 14 | www.enviromaster.com |
