Low Voltage Wiring; Emergency Stop; External Auto/Stop; Ice Building Option - Trane Ascend ACS 140 Installation, Operation And Maintenance Manual

Table 16. Default assignments
Relay
Relay 1 Terminals J2-1,2,3:
Relay 2 Terminals J2-4,5,6:
Relay 3 Terminals J2 - 7,8,9:
Relay 4 Terminals J2 -10,11,12:
Table 17. Lead/lag chiller sequence option default assignments
LLID Name
Operating Status Programmable Relays
Module 1
Operating Status Programmable Relays
Module 2
If any of the Alarm/Status relays are used, provide
electrical power, 115 VAC with fused-disconnect to the
panel and wire through the appropriate relays
(terminals on 1A10). Provide wiring (switched hot,
neutral, and ground connections) to the remote
annunciation devices. Do not use power from the
chiller's control panel transformer to power these
remote devices. See the field wiring diagrams which
are shipped with the unit.

Low Voltage Wiring

Emergency Stop

UC800 provides auxiliary control for a customer
specified/installed latching trip out. When this
customer-furnished remote contact 6S2 is provided,
the chiller will run normally when the contact is closed.
When the contact opens, the unit will trip on a latching
diagnostic. This latched condition requires either a
manual reset at the front of the control panel or a
power cycle of the UC800 to clear.
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
6S1.
AC-SVX002D-EN
Assignment
Evaporator Freeze
Avoidance Request
Maximum Capacity
Compressor Running
Latching Alarm
LLID Software
Relay Designation
Relay 0
Relay 1
Relay 2
Relay 3
Relay 4
Relay 5
Relay 6
Relay 7
The eight available relays in the Lead/Lag Chiller
Sequence Option are assigned with the following
defaults as follows:
Output Name
Status Relay 1, J2-1,2,3
Status Relay 2, J2-4,5,6
Status Relay 3, J2-7,8,9
Status Relay 4, J2-10,11,12
Status Relay 5, J2-1,2,3
Status Relay 6, J2-4,5,6
Status Relay 7, J2-7,8,9
Status Relay 8, J2-10,11,12
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.

Ice Building Option

If Programmable Relay Option is included with
Evaporator Application item 'Ice', UC800 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 is provided, the chiller will
run normally when the contact is open.
UC800 will accept either an isolated contact closure
(External Ice Building command) or a Remote
I I n n s s t t a a l l l l a a t t i i o o n n E E l l e e c c t t r r i i c c a a l l
Default
Evaporator Water Freeze
Avoidance Request
Maximum Capacity
Compressor Running
Latching Alarm
Alarm Ckt 2
Alarm Ckt 1
Alarm (Latching or Non latching)
Non Latching Alarm
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