71
RTAA-IOM-3
Alarm/Running/Maximum
Capacity Indicator Wiring
If the optional remote Alarm/Running/
Maximum Capacity contacts are used,
provide electrical power, 115 VAC
(contact load not to exceed 1150 VA
inrush, 115 VA sealed), with fused-
disconnect to a customer-furnished
remote device. Also provide proper
remote device ground connection.
To install the available remote running
and alarm indication, the installer must
provide leads 525 thru 532 from the
panel to the proper terminals of
terminal strip 1U1TB4 on the UCM, as
shown in Figures 31 thru 32. Refer to
the field diagrams which are shipped
with the unit.
Low Voltage Wiring
The remote devices described below
require low voltage wiring. All wiring to
and from these remote input devices to
the UCM must be made with shielded,
twisted pair conductors. Be sure to
ground the shielding only at the UCM.
See Figures 34 thru 36 for the
recommended conductor sizes.
Caution: To prevent control
malfunctions, do not run low
voltage wiring (<30 V) in conduit
with conductors carrying more
than 30 volts.
Emergency Stop (Normal Trip)
The UCM provides auxiliary control for
a customer specified/installed latching
tripout. When this customer-furnished
remote contact (5K18) is provided, the
chiller will run normally when the
contact is closed. When the contact
opens, the unit will trip off on a
manually resettable diagnostic. This
condition requires manual reset at the
chiller switch on the front of the UCM.
To connect, first remove the jumper
located between terminals 3 and 4 of
1U1,TB1 on the UCM. Connect low
voltage leads 513 and 514 to those
terminals. Terminal strip locations are
shown in Figures 34 thru 36. 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 12 VDC, 45 mA resistive load.
External Circuit Lockout – Circuit #1
The UCM provides auxiliary control of
a customer specified or installed
contact closure, for individual operation
of Circuit #1. If the contact is open, the
refrigerant circuit will not operate.
Upon closure, the refrigerant circuit will
run normally. This feature is used to
restrict total chiller operation, e.g.
during emergency generator
operations.
External circuit lockout will only
function if menu item 3b is enabled.
These customer-supplied contact
closures must be compatible with 12
VDC, 45 mA resistive load. Silver or
gold plated contacts are
recommended.
RTAA 130-200
To install, cut, strip and wire-nut
existing wire loop #W59 on the P43
connector of the 1U4 module to low
voltage leads 45A and 45B.
Connections are shown in the field
diagrams which are shipped with the
unit.
RTAA 240-400
To install, cut, strip and wire-nut
existing wire loop #W53 on the P43
connector of the 1U4 module to low
voltage leads 568 and 569. Connections
are shown in the field diagrams which
are shipped with the unit.
External Circuit Lockout – Circuit #2
The UCM provides auxiliary control of
a customer specified or installed
contact closure, for individual operation
of Circuit #2. If the contact is open, the
refrigerant circuit will not operate.
Upon closure, the refrigerant circuit will
run normally. This feature is used to
restrict total chiller operation, e.g.
during emergency generator
operations.
These customer-supplied contact
closures must be compatible with 12
VDC, 45 mA resistive load. Silver or
gold plated contacts are
recommended.
External circuit lockout will only
function if menu item 3b is enabled.
RTAA 130-200
To install, cut, strip and wire-nut
existing wire loop #W60 on the P53
connector of the 1U5 module to low
voltage leads 46A and 46B.
Connections are shown in the field
diagrams which are shipped with the
unit.
RTAA 240-400
To install, cut, strip and wire-nut
existing wire loop #W55 on the P63
connector of the 1U6 module to low
voltage leads 566 and 567. Connections
are shown in the field diagrams which
are shipped with the unit.
Ice Making Option
Menu Item 32 must be Enabled. The
UCM provides auxiliary control for a
customer specified/installed contact
closure for ice making. When contact
(5K20) is provided, the chiller will run
normally when the contact is open.
Upon contact closure, the UCM 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
(Menu Item 33 = Setpoint). The UCM
will not permit the ice-building mode to
be reentered until the unit has been
switched out of ice-building mode
(open 5K20 contacts) and then
switched back into ice-building mode
(close 5K20 contacts.)
In ice-building, both the 1.5 F/min.
pulldown rate limit and freeze
avoidance will be ignored and the
current unit setpoint will be set at
120%. For example, if the Front Panel
or External Current Limit setpoint is set
to 80%, in ice-building the Active
Current Limit is 120%.
If, while in ice-building mode, the unit
gets down to the freezestat setting
(water or refrigerant), the unit will shut
down on a manually resettable
diagnostic, just as in normal operation.
Connect leads 501 and 502 from 5K20
to the proper terminals of 1U2,TB1 on
the UCM, as shown in Figures 34 thru
36. 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 12 VDC, 45 mA resistive load.
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