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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
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 1K13). 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
The remote devices described below require low
voltage wiring. All wiring between these remote input
devices and the control panel must be made with
shielded, twisted pair conductors. Ground the shielding
only at the panel.
I I m m p p o o r r t t a a n n t t : : The remote devices described below
require low voltage wiring. All wiring to
and from these remote input devices to the
Control Panel must be made with shielded,
twisted pair conductors. Be sure to ground
the shielding only at the panel.
Emergency Stop
UC800 provides auxiliary control for a customer
specified/installed latching trip out. When this
customer-furnished remote contact 5K35 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.
Connect low voltage leads to terminal strip locations
on 1K2. 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
5K34 to the proper terminals of the LLID 1K2 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.
44
External Circuit Lockout – Circuit #1 and
#2
UC800 provides for an auxiliary input of a customer
specified or installed contact closure, for individual
inhibition of the operation of either or both circuits. If
the contact (5K32 for Ckt1, or 5K33 for Ckt2) is closed,
the respective refrigerant circuit will not operate.
Upon contact opening, the respective refrigerant circuit
will run normally. This feature is used to restrict total
chiller operation, e.g. during emergency generator
operations.
Connections to 1K3 inputs 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
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 5K36 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
Communicated input (Tracer) to initiate and command
the Ice Building mode.
UC800 also provides a "Front Panel Ice Termination
Setpoint", settable through Tracer® TU, and adjustable
from 20 to 31°F (-6.7 to -0.5°C) in at least 1°F (1°C)
increments.
N N o o t t e e : : 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.
N N O O T T I I C C E E
E E q q u u i i p p m m e e n n t t D D a a m m a a g g e e ! !
F F a a i i l l u u r r e e t t o o f f o o l l l l o o w w i i n n s s t t r r u u c c t t i i o o n n s s c c o o u u l l d d r r e e s s u u l l t t i i n n
d d a a m m a a g g e e t t o o s s y y s s t t e e m m c c o o m m p p o o n n e e n n t t s s . .
F F r r e e e e z z e e i i n n h h i i b b i i t t o o r r m m u u s s t t b b e e a a d d e e q q u u a a t t e e f f o o r r t t h h e e l l e e a a v v i i n n g g
w w a a t t e e r r t t e e m m p p e e r r a a t t u u r r e e . .
Tracer® TU must also be used to enable or disable Ice
Machine Control. This setting does not prevent the
Tracer from commanding Ice Building mode.
AC-SVX001A-EN
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