Heat Pump Screen; Figure 12 - Heat Pump Screen - York YK Style H Operation Manual

FORM 160.76-O2
issue date: 6/15/2015

FIGURE 12 - HEAT PUMP SCREEN

OVERVIEW
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 Heat-
ing mode and Cooling mode using the Unit Control
mode setpoint on this screen. In Heating mode, the chill-
er 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 chiller is equipped with a VSD, it will operate at full
speed (50Hz or 60Hz) at all times in Heating mode. In
Cooling mode, it operates normally.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION

HEAT PUMP SCREEN

All setpoints pertinent to this feature are maintained on
this screen.
DISPLAY ONLY
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 Tem-
perature Setpoint to which the Heat Pump is operat-
ing, whether controlled locally or remotely, in Heating
mode.
Leaving Condenser Liquid Temperature
Setpoints – Remote Range
Displays the temperature range over which a remote
device (in Analog or Digital Remote mode) can reset
the Heat Pump Leaving Condenser Liquid Tempera-
2
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