Units with Condensation Pumps

Troubleshooting procedure Continued

Optional Heat pump

with Electric Heat

Continued

EMI heat pump systems utilize a reversing valve is that is energized in the cooling mode. The reversing-valve signal is provided through the orange (O) low volt wire of the air handler or thermostat. It should remain energized constantly as long as the indoor unit or thermostat remains in cooling mode. To check for 24v reversing valve voltage, at the outdoor unit, place a voltmeter across the brown (C) and orange (O) wires while in the cooling mode.

heating: Heat pump units can accommodate two-stage heating when an optional electric strip heater is present along with a heat pump condenser. The first stage being the compressor and the second is electric heat. The air handler or wall thermostat will cycle the condenser through the yellow (Y) wire as it does in cooling however the reversing valve will not be energized. To check for a condenser signal, place the indoor unit or wall thermostat in heating. Next place the set-point temperature one degree above room temperature to call the first stage of heating. Then, with a voltmeter check for 24 volts across the yellow (Y) and brown

(C)wires at the condenser. The electric heat should be off at this point. Select a set-point temperature that is more than two degrees above the room temperature to call for the second stage of heating. The electric heat should energize along with the 24v compressor signal between “Y” and “C”. Check to see that the amp draw corresponds with the electric heat rating.

The following current values apply when the unit is connected to a 230V power supply. These values include indoor fan mo- tor current. If the supply power is different, this will affect the amp draw of the heater.

5kw = 22.3 amps, 4kw = 18 amps,

3kw = 13.5 amps.

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 heater end plate or on the heater assembly will interrupt power to the heater should an over- heat condition occur. Each electric heat assembly is also equipped with a one time fuse link. Should electric heat temperatures rise above the auto resetting limit switch, a non-resetting, one time fuse link will open and the heater will remain off (to restart a new fuse link is required).

EMI Air Handlers are available with an optional condensate pump. Condensate pumps are recommended when it is not possible to gravity drain the condensation from the indoor unit. Depending on the pump manufacture the maximum lift for the pump will vary. Consult the pump instruc- tions for the maximum lift for the particular pump being used.

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 water exceed the maximum preset level, a safety switch will open, there by interrupting the (Y) signal to the condenser. This will prevent the evapo- rator from generating more condensation and spilling out of the unit.

WLCA/WLHA High Wall Evaporator

www.enviromaster.com

WLHA, S1C specifications

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