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JOHNSON CONTROLS
118
FORM 150.62-NM8 (1020)
UNIT OPERATION
Outputs
Two output signals are fed to the EEV. The first controls
the EEV pilot solenoid portion of the valve and is
115VAC.
The second output is the EEV PWM signal which feeds
the heat motor. The signal will be a 24VAC pulsed signal
that is fed to the valve heat motor within a one second
period. This 24VAC signal can be fed to the motor 0% to
100% of the one second period. The signal is measured
in terms of watts with 100% equating to 30W, 50% to
15W, etc.
The EEV PWM signal is used to overdrive the valve
for faster response. It also allows the valve to stabilize
and control superheat more accurately. This feature is
especially valuable at start and during transients when
valve overfeed could cause liquid to be fed to the
compressor.
Program
The superheat setpoint is programmable under the
PROGRAM 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
superheat safety and the sensor failure safety. Details
are outlined in
“
System Safeties
”
located in Section 2
“
Fault Status Messages
”.
CONDENSER FAN CONTROL
(YCAL0014 THROUGH YCAL0080 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
operate based on outdoor ambient temperature only
(see Table 27).
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 concern.
Fan control by discharge pressure will work according
to Table 28. The Fan Control ON Pressure and Fan
Differential OFF Pressure
are programmable under the
PROGRAM key.
CONDENSER FAN CONTROL
(YCAL0090 THROUGH YCAL0134)
YCAL0090 through YCAL0134 fan control will be by
discharge pressure only
(see Tables 30 and 31).
LOW AMBIENT CONDENSER FAN CONTROL
(YCAL0014 THROUGH YCAL0080)
(YCAL0090 through YCAL0134 always operate in Low
Ambient Mode)
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
programmed for low ambient operation, the condenser
fans will operate as shown in Table 29 (YCAL0014
through YCAL0080) YCAL0090 through YCAL0134
is shown in Tables 30 and 31.
Condenser fan operation will controlled by discharge
pressure control 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 OP
-
TIONS key on YCAL0014 through
YCAL0080.
Compressor damage could occur if
programming does not match installed
hardware.
Summary of Contents for YCAL0014E Series
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