Johnson Controls YORK YMC2 User Manual

Table 19: Programmable
Button Access Description
Leaving Condenser
Liquid Temperature
Cycling Offset –
Shutdown
Operator
This setpoint allows the user to specify the Leaving
Condenser Liquid Temperature at which the Heat Pump
will shutdown on LEAVING CONDENSER LIQUID – HIGH
TEMPERATURE cycling shutdown in Heating mode. This is
done by defining an offset above the Leaving Condenser
Liquid Temperature Setpoint. The offset is programmable
over the range of 1 to 59°F (default 1) above the setpoint, to
a maximum of 125°F.
Anytime the Leaving Condenser Liquid Temperature
Setpoint is decreased, this shutdown threshold becomes
125°F for the next 10 minutes. After 10 minutes, the
shutdown threshold becomes the programmed setpoint
offset value. The actual offset being used is displayed as
Effective Offset on this screen. Usually, the offset that is
used is the same as the programmed value. However,
the setpoint used can change automatically to prevent
the Leaving Condenser Liquid temperature from going
above the maximum allowed temperature of 125°F. For
example, if the offset is set to 6°F but the Leaving Condenser
Liquid Temperature Setpoint is set to 120°F, the Effective
Offset used will be 5 because 6 would allow it to exceed the
maximum of 125.
Leaving Condenser
Liquid Temperature
Cycling Offset – Restart
Operator
This setpoint allows the user to specify the Leaving
Condenser Liquid Temperature at which the Heat Pump will
restart after a shutdown on a LEAVING CONDENSER LIQUID
TEMPERATURE – HIGH TEMPERATURE cycling shutdown
in Heating mode. This is done by defining an offset below
the Leaving Condenser Liquid Temperature Setpoint. It is
programmable over a range of 0 to 67°F (default 0) below
the Leaving Condenser Liquid Temperature Setpoint, to a
minimum of 55°F. The chiller will automatically re-start when
this temperature is reached. This setpoint can be used to
reduce chiller cycling by delaying the Heat Pump restart until
the heating load has increased.
45
YMC
2
Mod B with OptiView
™
Control Center

Johnson Controls YORK YMC2 Specifications

General

Brand	Johnson Controls
Model	YORK YMC2
Category	Chiller
Language	English