EMI WLCA installation manual Microprocessor Controller, Infrared Receiver & Fascia Display Panel

MICROPROCESSOR CONTROLLER

The following pages contain a brief overview of the optional cassette microprocessor control system and its components. The Infra-Red Remote Control manual is available from the unit manufacturer and provides a more comprehensive ex- planation of the operation and application of the Cassette microprocessor control system.

The microprocessor controller has built-in software to limit the number of starts per hour. This operates by having a minimum period of ten minutes between consecutive starts. A four minute delay period between the compressor stop-

ping and starting is also included to allow refrigerant pres- sures to equalize between high and low sides during the compressor off period.

IMPORTANT: Before applying main power to the unit, please ensure jumper link “JMP2” is in the correct position. JMP2 should be open for DX Non-Heat Pump or Chilled Water systems and closed for Heat Pump systems. (A jumper link settings guide can be found on the Cassette unit’s wiring schematic).

	230V AC	230V AC TRANSFORMER	BATTERY
COMPRESSOR	T E R M I - 10A FUSE	TERMINAL

COMPRESSOR

IR RE-

HEATOUTPUT

SENSOR

HEAT INPUTT1 = ROOM SENSOR T2 = DEFROST INPUT

	CONDENSATE
VANE MOTOR OUTPUT	INDOOR FAN	REVERSING VALVE	JUMPER

INFRARED RECEIVER & FASCIA DISPLAY PANEL

The infrared receiver is an extension of the control board and is located on the fascia of the unit, connected by a 7 pin plug and socket.

The green On/Off indicator will remain lit when the unit is running or will flash if heating or cooling is required but the compressor anti-cycle timer is delaying compressor opera- tion.

Yellow indicators will illuminate to show when the unit is in “cool” or “heat” mode. These indicators will flash when the battery on the main circuit board requires changing.

The red indicator will be lit when the in-built time clock func- tion is activated. To disable the time clock, all start/stop times must be set to 12am via the transmitter (see program- ming instructions in this installation manual). The red indi- cator is also used to diagnose operational alarms.

SELF DIAGNOSTICS: The microprocessor controller has a built-in diagnostics feature so that, in the event of an alarm, the nature of the fault can be determined. The red timer/ alarm LED flashes on the fascia in a pre-determined fre- quency depending on the fault. These are identified below:

1.Red Timer/Alarm flashes once every second - in- door coil sensor failure, low coil temperature or condensate high level trip.

2.Red Timer/Alarm flashes once every 5 seconds - return air sensor failure.

Refer to the Troubleshooting section of this manual for further instruction on dealing with alarms.

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