Installation and Maintenance Manual

Installation - Electrical
70 RTAC-SVX01M-EN
diagnostic.This condition requires manual reset at the
chiller switch on the front of the control panel.
Connect low voltage leads to terminal strip locations on
1U4. Refer to the field diagrams that are shipped with the
unit.
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 #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 5K16 and 5K17.
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 IceTermination
Setpoint”, settable throughTechView, 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 temperature drops below the ice
termination setpoint, the chiller terminates the Ice
Building mode and changes to the Ice Building
Complete Mode.
Techview must also be used to enable or disable Ice
Machine Control.This setting does not prevent theTracer
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 permit the ice building mode
to be reentered until the unit has been switched out of ice
building mode (open 5K18 contacts) and then switched
back into ice building mode (close 5K18 contacts.)
In ice building, all limits (freeze avoidance, evaporator,
condenser, current) will be ignored. All safeties will be
enforced.
If, while in ice building mode, the unit gets down to the
freeze stat setting (water or refrigerant), the unit will shut
down on a manually resettable diagnostic, just as in
normal operation.
Connect leads from 5K18 to the proper terminals of 1U7.
Refer to the field diagrams which are shipped with the unit.
Silver or gold-plated contacts are recommended.These
customer furnished contacts must be compatible with 24
VDC, 12 mA resistive load.
External Chilled Water Setpoint
(ECWS) Option
The CH530 provides inputs that accept either 4-20 mA or 2-
10 VDC signals to set the external chilled water setpoint
(ECWS).This is not a reset function.The input defines the
set point.This input is primarily used with generic BAS
(building automation systems).The chilled water setpoint
set via the DynaView or through digital communication
withTracer (Comm3).The arbitration of the various chilled
water setpoint sources is described in the flow charts at the
end of the section.
The chilled water setpoint may be changed from a remote
location by sending either a 2-10 VDC or 4-20 mA signal to
the 1U6, terminals 5 and 6 LLID. 2-10 VDC and 4-20 mA
NOTICE:
Equipment Damage!
Freeze inhibitor must be adequate for the leaving water
temperature. Failure to do so will result in damage to
system components.