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Chilled and Condenser Water Flow Interlock Circuits
Proof of chilled water flow for the evaporator is made by the closure of flow switch
5S1 and the closure of auxiliary contacts 5K1 on terminals 1X1-5 and 1A6- J3-1 and
J3-2. Proof of condenser water flow for the condenser is made by the closure of flow
switch 5S2 and the closure of auxiliary contacts 5K2 on terminals 1X1-6 and 1A6-J2-1
and J2-2.
Head Relief Request Output
When the chiller is running in Condenser Limit Mode or in Surge Mode, the head relief
request relay on the 1A9-J2-6 to J2-4 will be energized and can be used to control or
signal for a reduction in the entering condenser water temperature.
This is designed to prevent high refrigerant pressure trip-outs during critical periods
of chiller operation.
Maximum Capacity Relay
When the chiller has been operating at maximum capacity for over a 10 minute (UT™
adjustable) time period this relay will activate. Also upon being less than maximum
capacity for 10 minutes, this relay will deactivate. This is located at LLID 1A9-J2-1 and
J2-3.
Compressor Running Relay
Relay activates while the compressor is running.
CVGF-SVX03B-EN
Control System Components
91
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