Advanced M52 Microprocessor User's Guide
ADVANCED M52UMCT2019 COLOR
Sequence of Operation
The following is an outline of the operation of the unit. Not all units have all options.
1. Unit powered
2. ClimateWorx Banner appears, controller counts down and beeps ten times.
3. Microprocessor initializes Co-Work and runs self check.
4. Random start timer activates
5. Restart delay counts down
Phase Loss (OPTION):
On loss or cross of a phase of supply power the unit will shut down or display Phase Loss
alarm. You must acknowledge the alarm and correct the phase before the unit will restart
.
6. Blower starts (Blower runs continuously) when unit is in the ON position and when
Restart mode is set to Auto.
7. Warm-up period begins to allow time for steady signal from sensors. Temp/Hum readings
flash on screen during warm-up.
8. DX systems, crankcase heaters are energized when compressor is OFF through auxiliary
N/C contact on compressor contactor.
9. Air cooled DX units with flooded condenser Low Ambient Control (LAC) N/C auxiliary
contact on compressor contactor energizes receiver heaters.
Analogue and digital outputs for functions
Cooling 0-10 vdc and 1 or 2 relay outputs
Heating 0-10 vdc and 1, 2 and/or 3 relay outputs
Humidifying 0-10 vdc and 1 relay outputs
Dehumidifying 0-10 vdc and 1 or 2 relay outputs
DX Demand (Cooling)
Cycles on compressors in stages 1 to 32 depending on number of units connected together with Co-
Work as demand for cooling increases from 0 to 100%.
Demand for compressor:
Compressor contactor receives signal from microprocessor. Positive Start timer (Pos. start
delay) starts and bypasses LP switch for cold start-up. When HP switch is closed the start
circuit is complete and the compressor starts.
N/C auxiliary contact on compressor contactor opens and de-energizes receiver heaters.
(Flooded Condenser LAC)
N/C auxiliary contact on compressor contactor opens and de-energizes crankcase heater.
N/O auxiliary contact on compressor contactor enables fans on remote condenser. (Air-cooled
units only)
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