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37
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
OPER DATA Key
The OPER DATA key gives access to unit and system
operating parameters. When the OPER DATA key is
pressed, system parameters will be displayed and remain
on the display until another key is pressed. After pressing
the OPER DATA key, the operating data messages can
be scrolled through by using the UP arrow and DOWN
arrow keys.
The following operating data messages will be displayed
in the order shown:
LLT = XXX.X
o
F
RLT = XXX.X
o
F
This display shows leaving liquid temperature. The
minimum display limit is -2.2°F and the maximum
display limit is 140°F.
AMBIENT AIR TEMP
= XXX.X
o
F "
This display shows the ambient air temperature. The
minimum display limit is 0.0°F and the maximum
display limit is 131°F.
SYS 1 SP = XXXX PSIG
DP = XXXX PSIG
SYS 1 ACTUAL SUCTION
CUTOUT = XXXX PSIG
SYS 1 AIR COIL DEFR
TEMP = XXX.X
o
F
These displays show suction and discharge pressures
in the heating mode, the system actual suction cutout
setting (based on system discharge pressure), and
ambient coil defrost temperature. The minimum display
limit for suction and discharge pressure is 0 psig. The
maximum display limit for suction pressure is 400 psig
and for discharge pressure is 648 psig. The minimum
display limit for defrost temperature is -19°F and the
maximum display limit is 84.2°F.
The above messages will be repeated sequentially for
System 2.
SYS 1 SP = XXXX PSIG
DP = XXXX PSIG
SYS 1 HOURS 1=XXXXX
2=XXXXX 3=XXXXX
The above two messages will appear sequentially for
each system. The first display shows accumulated
running hours of each compressor for the specific
system. The second message shows the number of starts
for each compressor on each system.
LOAD TIMER XXX SEC
UNLOAD TIMER XXX SEC
This message shows the status of the load and unload
timers in seconds until the unit can load or unload.
Whether the unit loads or unloads is determined by how
far the actual liquid temperature is from the SETPOINT.
Refer to Capacity Control Section for details of unit
loading and unloading.
TEMP ERROR XXX.X
o
F
TEMP RATE XXX.X
o
F/M
The first line of this message shows the temperature
error. That is the difference between the actual leaving
liquid temperature and the Setpoint High/Low Limit
(SETPOINT plus/minus CONTROL RANGE). Within
the control range the error is zero. The second line shows
the rate of change of leaving liquid temperature. Refer
to Capacity Control Section for further details.
LEAD SYSTEM IS
SYSTEM NUMBER X
This message indicates the current lead system. In the
example System 2 is the lead system, making System
1 the lag system. The lead system can be manually or
automatically selected. Refer to the Options key Section
for details.
EVAPORATOR HEATER
STATUS IS OFF"
This message indicates the status of the evaporator
heater.
The evaporator heater is controlled by ambient air
temperature. When the ambient temperature drops
below 40°F the heater turns on. When the temperature
rises above 45°F the heat turns off. An under voltage
condition will keep the heater off until full voltage is
restored to the system.
EVAPORATOR WATER
PUMP STATUS OFF "
Summary of Contents for YLPA 0115SE
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