ClimateWorx M52 - Chilled Water; DX Demand (Dehumidification); Rapid Dehumidification Feature (Series 6 Units Only)

Advanced M52 Microprocessor User's Guide
ADVANCED M52UMCT2019 COLOR 7
 Low-pressure switch remains closed after Pos. start time expires and compressor remains on.
Compressor stops when:
 Loss of demand
Compressor contactor opens
 Low pressure condition
Compressor stops when LP SW. opens. (Automatic reset) compressor contactor opens.
 Short cycling alarm (Low Pressure)
After three consecutive low-pressure alarms in 60 mins, compressor contactor opens. Alarm must
be acknowledged and cleared before Compressor will start.
 High pressure condition
Compressor stops when HP Switch opens. (Manual reset)
Compressor contactor opens. Compressor will not start until HP Switch is manually reset and
Alarm is acknowledged and cleared.
 Thermal protection opens (automatic reset)
Line voltage cut-outs on all compressors except Specter compressor where the compressor module
causes a Compressor Overload alarm and stops the compressor through the microprocessor.
Compressor module resets after 30 minutes.
Note: Anytime the contactor opens the comp. elapse timer keeps compressor off for 3 minutes
(adjustable)
Chilled Water
On demand for cooling or dehumidification chilled water valve opens as demand signal ramps up
from 0 to 100%. Valve operates on 0-10 Vdc.
Valve closes when:
Loss of demand, signal diminishes to 0 Vdc
DX Demand (Dehumidification):
Cycles on compressors in stages 1 to 32 depending on Series and number of units connected together
with Co-Work as demand for dehumidification increases from 0 to 100%.
Variable speed fans (if available) will nominally slow down to accelerate this process. See settings
tab.
Demand for compressor:
 Compressor contactor receives signal from microprocessor. Positive Start timer (Pos. start delay)
starts and bypasses LP switch for cold winter 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)
 Low-pressure switch remains closed after Pos. start time expires and compressor remains on.
Rapid Dehumidification Feature (Series 6 units only)
If there is less than 20 percent demand for cooling and a demand for dehumidification the Dehum.
Solenoid valve (DSV) closes.