JOHNSON CONTROLS
40
FORM 155.21-O1 (615)
RT10 Strong Soln from STS Temp Offset
Access Level required:
SERVICE
This offset is to compensate slight error of the RT10
sensor. The considered temperature for strong solution
from the Heat Exchanger will be read from RT10 + RT10
Strong Soln from STS Temp Offset. If this value is NOT
correct, the considered strong solution temperature from
the heat exchanger will be wrong. This temperature is
used by the panel to determine the need for dilution
during cycling shutdowns.
RANGE: -5°F to 5°F (-20°C to -15°C)
DEFAULT: 0°F
RT9 Condensed Refrigerant Temp Offset
Access Level required:
SERVICE
This offset is to compensate slight error of the RT9 sen-
sor. The considered temperature for condensed refriger-
ant will be read from RT9 + RT9 Condensed Refrigerant
Temp Offset. If this value is NOT correct, the considered
condensed refrigerant temperature will be wrong. This
temperature is used by the panel to determine strong
solution concentration for control. In the worst cases an
inaccurate value can contribute to crystallization.
RANGE: -5°F to 5°F (-20°C to -15°C)
DEFAULT: 0°F (-17.7°C)
RT3 Strong Soln from Gen Temp Offset
Access Level required:
SERVICE
This offset is to compensate slight error of the RT3
sensor. The considered temperature for strong solution
from generator will be read from RT3 + RT3 Strong Soln
from Gen Temp Offset. If this value is NOT correct, the
considered strong solution temperature will be wrong.
This temperature is used by the panel to determine strong
solution concentration for control. In the worst cases an
inaccurate value can contribute to crystallization.
RANGE: -5°F to 5°F (-20°C to -15°C)
DEFAULT: 0°F (-17.7°C)
Refrigerant Pump Shutoff Delay
Access Level required:
SERVICE
This setpoint determines the time delay between detec-
tion of insufficient refrigerant level and the control center
initiating a shutdown of the Buffalo refrigerant pump.
When the refrigerant level has decreased below the level
that allows refrigerant level switch 3F to open, and it
remains open continuously for the duration of the pro-
grammed timer, the refrigerant pump will be shutdown
after this setpoint time delay has elapsed. This setpoint
is used in conjunction with the REFRIGERANT PUMP
STARTUP DELAY setpoint to limit pump cycling.
RANGE: 1 second - 45 seconds
DEFAULT: 30 seconds
Refrigerant Pump Start-up Delay
Access Level required:
SERVICE
This setpoint determines the delay between detection
of sufficient refrigerant level and the control center
initiating a start of the Buffalo refrigerant pump. When
the refrigerant level has increased to a level that allows
refrigerant level switch 1F to close, and it remains closed
continuously for the duration of this timer, the refrigerant
pump will be started after this setpoint time delay has
elapsed. This setpoint is used in conjuntion with the RE-
FRIGERANT PUMP SHUTDOWN DELAY setpoint to
limit pump cycling. This setpoint timer is disabled at the
instant of unit shutdown. This is to allow the refrigerant
pump to start at the begining of the dilution cycle.
RANGE: 1 second - 900 seconds
DEFAULT: 120 seconds
Chiller Refrigerant Level Shutdown Delay
Access Level requirement:
SERVICE
This setpoint is a timer that determines the amount of
time the unit is allowed to operate without the refrigerant
pump running when the unit is equipped with Buffalo
pumps. If the refrigerant pump is not started before the
timer elapses, a safety shutdown is performed and "DAY-
TIME-REFRIGERANT PUMP LEVEL SWITCH 3F
FAILURE" is displayed.
RANGE: 20 minutes - 60 minutes
DEFAULT: 30 minutes
Motor Coolant Solenoid Open Temp
(Units equipped with Franklin Pumps Only)
Access Level requirement:
SERVICE
The motor coolant solenoid valve (1SOL) is normally
energized (opened) when the strong solution temperature
is greater than 160°
F (71.1
°C) and de-energized (closed)
when it is less than 150°F (65.5°C). Units operating at
lower heat source temperature require a lower tempera-
ture threshold for energizing (opening) the motor coolant
solenoid valve (1SOL). The "close" threshold is fixed
at (programmed open threshold minus 10°F (-12.2°C)).
The default value should be used unless directed other-
wise by YORK/Johnson Controls Service.
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