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Operating Procedures
WXM Digital Inputs
Digital input (DI) data includes these parameters:
DI1
Remote On/Off – Used to turn module on/off via input. For
Primary Module toggling DI1 will turn on/off the entire
chiller if respective option selected.
DI2, DI3
These inputs indicate the Discharge/Suction Pressure
switches of Circuit 1. DI closed - pressure is in the normal
range; DI opened - pressure is exceeding normal range
threshold (faulty state).
DI4
This input shows the state of Load flow switch. DI closed -
flow present; DI opened - flow absent.
DI7
This input shows the state of the Source flow switch. DI
closed- flow present; DI opened - flow absent.
DI8
This input shows the Pump-down pressure switch of Circuit
1. DI closed - pressure is in the normal range; DI opened -
pressure is exceeding normal range threshold (faulty
state).
MWC Digital Outputs
There is an LED for each digital output which shows its
current state.
DO1, DO2
Comp On/Off – this output turns a compressor on and off.
DO3
Liq Line Solenoid – this output energizes and de-energizes
the liquid line solenoid valve.
MWC Expansion I/O Screens
Table 12. Expansion input/output screens (MWC)
MWC Primary Expansion I/O Screen#1
44
DO10
General Alarm – this output energizes when any of the
following alarms occur:
•
An alarm that shuts down and locks out compressor 1
or 2.
•
An alarm that shuts down and locks out the entire
module.
DO11
Panel Heater/Fan (optional) – this output is used when
temperature control inside control panel is required.
WXM Digital Outputs
There is an LED for each digital output which shows its
current state.
DO1, DO2
Comp On/Off – this output turns a compressor on and off.
DO3
Liq Line Solenoid – this output energizes and de-energizes
the liquid line solenoid valve.
DO5
Reversing Valve – this output energizes and de-energizes
reversing valve on Circuit 1.
DO10
General Alarm – this output energizes when any of the
following alarms occur:
•
An alarm that shuts down and locks out compressor 1
or 2.
•
An alarm that shuts down and locks out the entire
module.
DO11
Panel Heater/Fan (optional) – this output is used when
temperature control inside control panel is required.
MWC Primary Expansion I/O Screen#2
ARTC-SVX010A-EN
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