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80 RTAC-SVX01F-EN
Installation - Electrical
Silver or gold-plated contacts are recommended. These customer-furnished contacts
must be compatible with 24 VDC, 12 mA resistive load.
External Auto/Stop
If the unit requires the external Auto/Stop function, the installer must provide leads
from the remote contacts 5K15 to the proper terminals of the LLID 1U4 on the control
panel.
The chiller will run normally when the contacts are closed. When either contact
opens, the compressor(s), if operating, will go to the RUN:UNLOAD operating mode
and cycle off. Unit operation will be inhibited. Closure of the contacts will permit the
unit to return to normal operation.
Field-supplied contacts for all low voltage connections must be compatible with dry
circuit 24 VDC for a 12 mA resistive load. Refer to the field diagrams that are shipped
with the unit.
External Circuit Lockout – Circuit #1 and Circuit #2
CH530 provides auxiliary control of a customer specified or installed contact closure,
for individual operation of either Circuit #1 or #2. If the contact is closed, the
refrigerant circuit will not operate 1K15 and 1K16.
Upon contact opening, the refrigerant circuit will run normally. This feature is used to
restrict total chiller operation, e.g. during emergency generator operations.
Connections to 1U5 are shown in the field diagrams that are shipped with the unit.
These customer-supplied contact closures must be compatible with 24 VDC, 12 mA
resistive load. Silver or gold plated contacts are recommended.
Ice Building Option
CH530 provides auxiliary control for a customer specified/installed contact closure for
ice building if so configured and enabled. This output is known as the Ice Building
Status Relay. The normally open contact will be closed when ice building is in
progress and open when ice building has been normally terminated either through Ice
Termination setpoint being reached or removal of the Ice Building command. This
output is for use with the ice storage system equipment or controls (provided by
others) to signal the system changes required as the chiller mode changes from “ice
building” to “ice complete”. When contact 5K18 is provided, the chiller will run
normally when the contact is open.
CH530 will accept either an isolated contact closure (External Ice Building command)
or a Remote Communicated input (Tracer) to initiate and command the Ice Building
mode.
CH530 also provides a “Front Panel Ice Termination Setpoint”, settable through
TechView, and adjustable from 20 to 31°F (-6.7 to -0.5°C) in at least 1°F (1°C)
increments.
NOTE: When in the Ice Building mode, and the evaporator entering water temper-
ature drops below the ice termination setpoint, the chiller terminates the Ice Building
mode and changes to the Ice Building Complete Mode.
CAUTION
Evaporator Damage!
Freeze inhibitor must be adequate for the leaving water temperature.
Failure to do so will result in damage to system components.
Techview must also be used to enable or disable Ice Machine Control. This setting
does not prevent the Tracer from commanding Ice Building mode.
Upon contact closure, the CH530 will initiate an ice building mode, in which the unit
runs fully loaded at all times. Ice building shall be terminated either by opening the
contact or based on the entering evaporator water temperature. CH530 will not