JOHNSON CONTROLS
114
FORM 150.63-NM6 (1020)
Unit Controls
Program
The superheat setpoint is programmable under the Pro-
gram key. Superheat may be programmed for 10°F to
15°F, with 12°F as the default. It is recommended that a
12°F to 15°F setpoint be used for most applications.
Safeties
Two safeties are associated with the EEV, the low su
-
perheat safety and the sensor fault safety. Details are
outlined in the System Safeties section.
CONDENSER FAN CONTROL
(YCUL0045 – YCUL0275 CHILLERS)
Condenser fan operation must be programmed with the
Options key under “Fan Control.” Condenser fan control
can be selected for Ambient Temp. and Disch. Pressure,
or Discharge Pressure Only.
The condenser fan control by “Ambient Temperature
and Discharge Pressure” is a feature that is integral to
the standard software control. If the optional discharge
transducer is not installed, the condenser fans will op-
erate based on outdoor ambient temperature only. See
Table 26.
The condenser fan control by “Discharge Pressure” is
a feature that can be selected if the discharge pressure
transducer is installed and fan recycling is not a con-
cern. Fan control by discharge pressure will operate ac-
cording to Table 27. The fan control on-pressure and
fan differential off-pressure are programmable under
the PROGRAM key.
LOW AMBIENT CONDENSER FAN CONTROL
(YCUL0045 – YCUL0275)
For unit operation below 25°F (-3.9°C) a low ambient
kit is required. The kit consists of a discharge pressure
transducer(s) and reversing contactors.
With the low ambient kit installed and the unit pro-
grammed for low ambient operation, the condenser
fans will operate as shown in Table 28 (YCUL0045
– YCUL0275)
Condenser fan operation in low ambient mode will be
controlled by discharge pressure only.
The fan control on-pressure and the fan differential
off-pressure are programmable under the PROGRAM
key.
A low ambient kit MUST be installed
when “AMBIENT CONTROL
LOW AMBIENT” is selected under
the OPTIONS key on YCUL0045–
YCUL0275.
Compressor damage could occur if
programming does not match installed
hardware.
Summary of Contents for YCUL0045
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