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45
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
In the cooling mode the suction pressure cut-out
cooling protects the unit from a refrigerant to water heat
exchanger freeze-up. If the suction pressure drops below
the cutout point, the system will shut down.
SUCTION PRESS CUTOUT
HEATING= XXXX PSIG
In the heating mode the suction pressure cut-out heating
protects the unit from low suction pressure in the
ambient coils. If the suction pressure drops below the
cut-out point, the system will shut down.
There are some exceptions when the
suction pressure is permitted to temporarily
drop below the cut-out setting. Refer to
Fault Status Message Section for details.
LOW AMBIENT TEMP
CUTOUT = XXX.X
o
F
The low ambient temperature cut-out setting is
applicable to the cooling mode only (NOTE in heating
mode the cut-out is fixed at 14°F or -17.6°F if fan full
speed inhibit is in effect with optional 2 speed fans). If
the ambient temperature falls below this point, the unit
will shut down. Restart can occur when temperature
rises 3.6°F above the cut-out setting.
LEAVING LIQUID TEMP
CUTOUT = XXX.X
o
F
The leaving liquid temperature cut-out protects the
unit in the cooling mode from a refrigerant to water
heat exchanger freeze-up. Anytime the leaving liquid
temperature drops to the cut-out point, the unit shuts
down. Restart will be permitted when the leaving liquid
temperature rises 2°F cooling mode or 3.6 °F heating
mode above the cut-out setting.
When water cooling mode is programmed
(OPTIONS key), the cut-out is fixed at 3.0°C
and cannot be changed. Glycol cooling
mode values are programmable.
ANTI RECYCLE TIME
= XXX SECS
Each system has its own anti-recycle timers. The
anti-recycle time under the PROGRAM key can be
programmed between 240-600 seconds and sets the
minimum start-to-start time of the lead compressor in
a system. A second non-programmable anti-recycle
timer, stop to start is fixed at 90 seconds and starts to
countdown when the lead compressor in a system cycles
off. On power up only this timer is set to 120 seconds
not 90 seconds.
The anti-recycle message is displayed when a system
is unable to start due to either of the anti-recycle timers
being active (counting down). The actual time displayed
will be the longer of the two timers, start-to-start or
stop-to-start. The lag compressors in a system, are not
controlled by the anti-recycle timer.
FAN CONTROL ON
PRESSURE = XXXX PSIG
In the cooling mode the fan control ON pressure is the
programmed setting that is used to stage the ambient
coil fans on, in relation to discharge pressure.
FAN DIFFERENTIAL OFF
PRESSURE = XXXX PSIG
In the cooling mode the fan differential OFF pressure
is the programmed differential setting that is used to
stage the ambient coil fans off, in relation to discharge
pressure.
TOTAL NUMBER OF
COMPRESSORS = X
The total number of compressor settings determines the
stages of loading available.
The total number of compressors must be
programmed correctly to ensure proper unit
operation.
SYS1 NUMBER OF FANS
= X
SYS2 NUMBER OF FANS
= X
The total number of fans per system must
be programmed correctly to ensure proper
unit operation.
REMOTE UNIT ID
PROGRAMMED = X
When the unit is connected to a remote ISN controller
this message allows the identification number to be
programmed into the unit.
Summary of Contents for YLPA 0115SE
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