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TROUBLESHOOTING PROCEDURE Continued
Low Volt Controls
Cooling Only Units:
Cooling only units require 18awg low Volt interconnecting wires between the indoor unit, outdoor units and thermostat. Ter- minals designated “Y1” (yellow) and “C” (brown) of the indoor air handler should be connected to the corresponding “Y” (yellow) and “C” (brown) wires or termi- nals of the outdoor condenser. Other wire(s) or terminals such as “R” (red) may not be needed and should be protect from making contact with the junction box or other metal surfaces.
Terminals “R”, “Y, “G”, “W” and “C” need to connect to the indoor, wall mounted thermostat.
NOTE: “W” is required for units with electric heat only “C” may not be needed on some thermostats.
Refer to low Volt interconnect diagram interconnect diagram figure 1 for remote thermostat connection.
A 24V transformer located in the indoor air handler unit provides low Volt control power to both the indoor air handler and outdoor condenser. The
The indoor unit contains an electronic anti short cycle timer feature (ASCT) that will prevent the outdoor condenser from short cycling. After the thermostat is satisfied there will be a three minute delay before the condenser is allowed to
Electric Heat:
Units with electric heat utilize a control relay located on the circuit board in the control box. As a safety feature, an auto resetting limit switch located on the heat- er assembly will interrupt power to the heater should an
The following current values apply when the unit is connected to a 230V power supply. These values include fan motor current. If the supply power is different, this will in turn affect the amp draw of the heater.
5kw = 22.3 amps, 3kw = 13.5 amps, 1.5kw = 6.9 amps.
Units with Condensation Pumps: EMI CAC is equipped with an internal condensate pump capable of removing condensate up to a three foot vertical lift. Condensation generated by the evapo- rator will collect in the pumps’ reservoir. When the water level is high enough, a float switch will close and energize the pump motor clearing the water from the reservoir. Should, for any reason, the wa- ter exceed the maximum preset level, a safety switch will open, there by interrupt- ing the (Y1) signal to the condenser. This will prevent the evaporator from generat- ing additional condensation and spilling out of the unit.
CAC Cassette Evaporator | 22 | www.enviromaster.com |