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Section 1: General chiller information and safety
Building automation system interface
The Microprocessor Board can accept a 4 mA to 20 mA,
or 0 VDC to 10 VDC input to reset the leaving chiller
liquid temperature from a Building Automation System.
• The standard unit capabilities include remote
start-stop, remote water temperature reset via a
PWM 4 mA to 20 mA or 0 VDC to 10 VDC input
signal or up to two stages of demand (load) limit-
ing depending on model.
• The standard control panel can be directly con-
nected to a Johnson Controls Building Automated
System.
Power panel
Each panel contains:
• Compressor power terminals
• Compressor motor starting contactors per I.E.C.**
• Control power terminals to accept incoming for
115-1-60 control power
• Fan contactors and overload current protection
The power wiring is routed through liquid-tight con-
duit to the compressors and fans.
Accessories and options
Power options
Compressor power connections
Single-point terminal block connections are provided as
standard. The following power connections are available
as options. See Electrical data on page 57 for specific
voltage and options availability. (Factory-mounted)
Single-point supply terminal block
Includes enclosure, terminal-block, and interconnecting
wiring to the compressors. Separate external protection
must be supplied, by others, in the incoming compres-
sor-power wiring. Do not include this option if either the
Single-Point Non-Fused Disconnect Switch or Single-
Point Circuit Breaker options have been included.
Single-point non-fused disconnect switch
Unit-mounted disconnect switch with external, lockable
handle (in compliance with Article 440-14 of NEC), can
be supplied to isolate the unit power voltage for servic-
ing. Separate external fusing must be supplied, by others
in the power wiring, which must comply with the Na-
tional Electrical Code and/or local codes.
18
Single-point circuit breaker
A unit mounted circuit breaker with external, lockable
handle (in compliance with NEC Article 440-14), can be
supplied to isolate the power voltage for servicing. (This
option includes the Single-Point Power connection.)
Control transformer
Converts unit power voltage to 115-1-60 (2.0 or 3.0
KVA capacity). Factory mounting includes primary
and secondary wiring between the transformer and the
control panel. (Factory-mounted)
Control Options
Ambient Kit (Low)
Units will operate to 30°F (-1.1°C). This accessory in-
cludes all necessary components to permit chiller op-
eration to 0°F (-18°C) or -10°F (-23°C) with variable
speed fans. (This option includes the Discharge Pressure
Transducer / Readout Capability option.) For proper
head pressure control in applications below 30°F (-1°C)
where wind gusts may exceed 5 mph, it is recommend-
ed that Optional Condenser Louvered Enclosure Panels
also be included. (Factory-mounted)
High ambient kit with sunshield
Allows units to operate when the ambient temperature
is above 115°F (46°C). Includes sun shield panels and
discharge pressure transducers.
Language LCD and keypad display
Spanish, French, German, and Italian unit LCD con-
trols and keypad display available. Standard language
is English.
Compressor, piping, evaporator options
Low temperature glycol
Replaces standard Thermostatic Expansion Valves
with Electronic Expansion Valves to achieve leaving
glycol temperatures as low as 10°F (-12°C). Required
for any leaving liquid temperature below 30°F (-1°C).
Electronic Expansion Valves permit operation at both
low temperatures and comfort cooling applications
without a capacity loss or derate at either condition.
(Factory installed)
Chicago code relief valves
Unit will be provided with relief valves to meet Chi-
cago code requirements. (Factory-Mounted)
Form 150.72-ICOM6
Issue date: 12/19/2023
Johnson Controls
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