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50
Installation Electrical
The CH530 Service Tool (TechView) is used to install and assign any of the above
listed events or status to each of the four relays provided with this option.
The default assignments for the four available relays are listed below.
Table 13
Programable Relays
LLID Name
LLID Software Relay
Designation
Operating Status
Relay 0
Programmable Relays
Relay 1
Relay 2
Relay 3
External Auto/Stop
CH530 accepts an isolated contact closure input to request STOP or AUTO command
modes from a remote device. The contact closure status is monitored by a CH530
binary input. Contact closure represents an AUTO request, and contact opening
represents a STOP request.
Compressor Inhibit/ High Ambient Operation
Compressor Inhibit prevents the second compressor on all circuits from running
which lowers the overall power consumption and cooling capacity of the chiller. This
feature may be invoked by an optional hardware input or a BAS command.
Reduce Power Consumption: The 20 - 60 Ton chiller does not have a current limit
feature. This feature can be used to lower power consumption by limiting the number
of compressors available to the chiller.
High Ambient Operation: To minimize high pressure cutouts in high ambient
conditions, a thermostat can be connected to the external input to prevent operation
of the 2nd compressor on each circuit.
Condenser Water Temperature Sensor Connections
When the optional condenser water temperature monitoring feature is specified, a
pair of sensors are installed in the entering and leaving condenser water boxes.
Chilled Water Rest
The MP shall reset the chilled water temperature setpoint based on either return
water temperature, or outdoor air temperature. The Return Reset option is standard,
Outdoor Reset is optional.
The following shall be selectable:
1.
Reset Type Setpoint.
2. RESET RATIO Setpoints.
3. START RESET Setpoints.
4. MAXIMUM RESET Setpoints.
When the chiller is running, if any type of CWR is enabled, the MP will step the CWS
toward the desired CWS' at a rate of 1 degree F every 5 minutes until the Active CWS
equals the desired CWS'. When the chiller is not running the CWS shall be fully reset
immediately (within one minute). The chiller will then start at the Differential to Start
value above a fully reset CWS or CWS' for Outdoor, Return, and Constant Return
Reset.
Output Name
Status Relay 4, J2-1,2,3
Status Relay 3, J2-4,5,6
Status Relay 2, J2-7 ,8,9
Status Relay 1, J2-10,11,12
CGWF-SVX01A-EN
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