Trane CVGF-SVU02B-E4 Operation And Maintenance Manual page 48

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.
48
Control System
Components
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 (TechView
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-SVU02B-E4
™