EMI WLCA Unit Start Up - Indoor Unit, Control Circuit Checks, CONTROL CIRCUIT CHECKS DX Units

UNIT START UP - INDOOR UNIT

CONTROL CIRCUIT CHECKS (DX Units)

NOTE: Apply power to the Condensing 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 electrical check can now be carried out.

2.Switch on the indoor Cassette unit and check that the fan cycles correctly.

NOTE: In some models there is a two minute fan run on time to remove residual heat from the Cas- sette, if the unit is switched off during the heating mode.

3.On models with microprocessor controls, check that the High, Medium and Low fan speeds are op- erating correctly by changing the fan speed via the transmitter.

4.On models 15-48, check that the motorized vane sweep functions correctly by toggling the function on or off, either via the transmitter (micro units) or via the toggle switch on the back of the electrical panel lid (electro-mechanical units).

5.On micro controlled units, if required, check that the built-in timer function is programmed and oper- ating correctly. When the timer is activated, the red LED on the fascia display panel should be lit.

6.Check the operation of the condensate pump by pouring 7-8 ounces of water down the pump outlet, switch the unit on, select cooling mode and the lowest possible temperature setpoint then observe the water being pumped from the Cassette.

7.Where fitted, check the operation of the hot water valve or the electric heat elements by switching the system to the heating mode and selecting the highest possible temperature setpoint.

8.Ensure that the Condensing Unit start up proce- dure has been carried out as detailed in the corre- sponding installation manual.

9.The compressor signal “Y” (disconnected from the outdoor unit in step 1) can now be reconnected and main power applied to the system.

IMPORTANT: As of 12/01/04 EMI air handlers will be manu- factured with a low Volt transformer installed. At the same time, EMI outdoor condensers will be manufactures with- out a low Volt transformer. When connecting an EMI evapo-

rator to a non-EMI condenser, check to ensure that there is a 24V control transformer in either in the indoor unit or outdoor unit. Only one transformer is required. If a transformer is not present then one should be added to the indoor unit. If both

the indoor unit and outdoor unit contain a transformer, one

must be remover from the system.

CONTROL CIRCUIT CHECKS

(Chilled Water Units)

A thorough pipe work check and pressure test should be performed before the Cassette controls are set up.

1.Isolate the Cassette from the chilled water supply. A system electrical check can now be carried out.

2.Switch on the indoor Cassette unit and check that the fan cycles correctly.

NOTE: In some models there is a two minute fan run on time to remove residual heat from the Cassette, if the unit is switched off during the heating mode.

3.On models with microprocessor controls, check that the High, Medium and Low fan speeds are op- erating correctly by changing the fan speed via the transmitter.

4.On models 15-48, check that the motorized vane sweep functions correctly by toggling the function on or off, either via the transmitter (micro units) or via the toggle switch on the back of the electrical panel lid (electro-mechanical units).

5.On micro controlled units, if required, check that the built-in timer function is programmed and oper- ating correctly. When the timer is activated, the red LED on the fascia display panel should be lit.

6.Check the operation of the condensate pump by pouring 7-8 ounces of water down the pump outlet, switch the unit on, select cooling mode and the lowest possible temperature setpoint then observe the water being pumped from the Cassette.

7.Allow chilled water to enter the Cassette and vent air from the unit by opening the 1/4" air bleed. Re- tighten the bleed screw once all air has been re- moved.

8.Repeat steps 1-4 above for all Cassettes in the same systems.

The Cassettes are now ready for the system balance to be performed.

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