Ingersoll-Rand Trane Ascend ACS, Installation, Operation And Maintenance Manual

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38 AC-SVX002C-EN
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Water Pump Power Supply
For units without the optional pump package, provide
power supply wiring with disconnect for the chilled
water pump(s).
For units with the optional pump package, power is
provided through a separate factory-wired control
panel, integrated into the chiller unit power.
Interconnecting Wiring
Chilled Water Flow (Pump) Interlock
This chiller requires a field-supplied, control-voltage
contact input through a flow proving switch (6S51) and
an auxiliary contact (6K51). Connect the proving switch
and auxiliary contact to terminal 2 connector J2 cards
(1A11). Refer to the field wiring diagram for details.
Chilled Water Pump Control
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An evaporator water pump output relay’s normally-
open contact closes to start the evaporator water pump
when the chiller is given a signal to go into the Auto
mode of operation from any source. The contact is
opened to turn off the pump in the event of most
machine level diagnostics to prevent the build up of
pump heat.
The relay output is required to operate the Evaporator
Water Pump (EWP) contactor. The relay’s contacts are
compatible with 115/240 VAC control circuits. See
Programmable Relays section for rating details.
Normally, the EWP relay follows the AUTO mode of the
chiller. Whenever the chiller has no diagnostics and is
in the AUTO mode, regardless of where the auto
command is coming from, the relay is energized and
the normally-open contact is closed. When the chiller
exits the AUTO mode, the relay’s normally-open
contact is timed to open in an adjustable (using
Tracer
® TU service tool) 0 to 30 minutes. The non-
AUTO modes, in which the pump is stopped, include
Reset, Stop, External Stop, Remote Display Stop,
Stopped by Tracer, Start Inhibited by Low Ambient
Temp, and Ice Building complete.
Table 16. Pump relay operation
Chiller Mode
Relay Operation
Auto Instant Close
Ice Building Instant Close
Tracer Override Close
Stop Timed Open
Ice Complete Instant Open
Diagnostics Instant Open
When going from Stop to Auto, the EWP relay is
energized immediately. If evaporator water flow is not
established in 20 minutes (for normal transition) or 4
minutes, 15 seconds (for pump commanded ON due to
an override safety), the UC800 de-energizes the EWP
relay and generates a non-latching diagnostic. If flow
returns (e.g. someone else is controlling the pump), the
diagnostic is cleared, the EWP is re-energized, and
normal control resumed.
If evaporator water flow is lost once it had been
established, the EWP relay remains energized and a
non-latching diagnostic is generated. If flow returns,
the diagnostic is cleared and the chiller returns to
normal operation.
Lead/Lag Dual Pump
The running pump is changed each time the unit is
switched on.
Programmable Relays
A programmable relay concept provides for
enunciation or hardwired interlocking of certain events
or states of the chiller, selected from a list of likely
needs, while only using four physical output relays, as
shown in the field wiring diagram. The four relays are
provided (generally with a Quad Relay Output LLID) as
part of the Programmable Relay Option. The relay’s
contacts are isolated Form C (SPDT), suitable for use
with 120 VAC circuits drawing up to 2.8 amps inductive,
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