AUX EL Series Instructions d'exploitation télécharger pdf (Page 34)

09/11/2014 32 NI401

Operational Tips

ICM Board – The ICM board performs the functions controlling the compressor operation: system lockout,

compressor anti-short cycle, and a five minute delay after power is applied.

The control will begin the 5-minute time delay upon a Y call from the thermostat. After the time delay expires,

the compressor contactor will be energized as long as the high and low pressure switches are closed. If either

switch is open after the delay expires, the compressor will not energize. If either switch opens while the

compressor is energized, it will de-energize immediately and begin the anti-short cycle delay. The compressor

will not be allowed to turn on again until the anti-short cycle delay expires and both pressure switches are

closed. The flow switch will have a 30-second bypass timer in which the control will ignore an open flow

switch for the first 30 seconds. If the flow switch remains open after the 30-second bypass timer expires, the

unit will de-energize the compressor and begin the anti-short cycle delay. If the control experiences three high

pressure, low pressure, or flow switch faults in a 60-minute period, it will lock out the compressor and energize

the fault output. A manual reset of power will be required to reset the lockout condition.

Problems that could cause a lockout situation include:

1. Water flow problems

2. Air flow problems

3. Internal heat pump operation problems

4. Cold ambient air temperature conditions

The control has a status LED to indicate which type of fault or lockout has occurred. If a high pressure fault or

lockout occurs, the status LED will blink once. If a low pressure fault or lockout occurs, the status LED will

blink twice. If a flow switch fault occurs, the status LED will blink three times.

ICM Fault Code LED

1 blink = high pressure cutout (550 PSI)

2 blink = low pressure cutout (40 PSI)

3 blink = Flow switch open

The anti-short cycle function puts a time-out period of 5 fixed ±20% minutes on the compressor before re-

starting. This function protects the compressor from repeated on/off operation in the event of a loose wire or

faulty controller.

CAUTION

The front panel override switch should not be changed during a heat call. There are no purge

cycles when manually changing the override switch with an active heat call and could cause an

undesired overheat situation

High and Low Pressure Switches – The heat pump is equipped with both high and low pressure switches that

shut the unit off if the refrigerant pressure exceeds 550 PSI or goes below 40 PSI. The freeze protection switch

(on open loop systems) will also activate the lockout at 40 PSI in the heating mode to protect the water coil

against freeze rupture. Do not reset a well water system in the heating mode without first verifying water flow.

DO NOT reset the system more than once.

Repeated resetting of the lockout can cause serious damage. If same lockout occurs contact your service

dealer immediately.

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AUX EL Series Instructions d'exploitation Page 34