Heat pump screen
Figure 31: Heat pump screen
Heat Pump is an available option on certain models of YK chillers. The feature is enabled and
disabled on the Setup Screen. When enabled, this Heat Pump Screen is accessible from the
Condenser Screen. The Heat Pump control can be switched between Heating mode and Cooling
mode using the Unit Control mode setpoint on this screen. In Heating mode, the chiller controls
the Leaving Condenser Liquid Temperature to its setpoint. In Cooling mode, the chiller controls the
Leaving Chilled Liquid Temperature to its setpoint.
When Heat Pump is enabled, certain conditions are automatically set as follows: The Heat Recovery
and Head Pressure Control options are disabled and locked. The Condenser Temperature Range
Setpoint is set to Extended. The Condenser High Pressure Warning Setpoint threshold is set to 193
psig.
The Quick Start feature is only available in Cooling mode and is automatically disabled when
Heating mode is selected.
If the chiller is equipped with a VSD, it will operate at full speed (50 Hz or 60 Hz) at all times in
Heating mode. In Cooling mode, it operates normally.
All setpoints pertinent to this feature are maintained on this screen.
Table 24: Display only fields
Field/LED name
Description
Leaving Condenser Liquid
Temperature
Displays the temperature of the liquid as it leaves the condenser.
Entering Condenser Liquid
Temperature
Displays the temperature of the liquid as it enters the condenser.
Leaving Condenser Liquid
Temperature Setpoints – Setpoint
Displays the active Leaving Condenser Liquid Temperature Setpoint to which the Heat
Pump is operating, whether controlled locally or remotely, in Heating mode.
Leaving Condenser Liquid
Temperature Setpoints – Shutdown
Displays the Leaving Condenser Liquid Temperature at which the Heat Pump will shut
down on
LEAVING CONDENSER LIQUID – HIGH TEMPERATURE
cycling shutdown in
Heating mode. See Leaving Condenser Liquid Temperature Cycling Offset – Shutdown
Setpoint description below.
45
Model YK Style H Centrifugal Liquid Chillers with OptiView Control Center
