York YMC2 User Manual

JOHNSON CONTROLS
38
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
OVERVIEW
Heat Pump is an available option on certain models of
YMC2 chillers. The feature is enabled and disabled on
the SETUP Screen (Service level required). When en-
abled, this HEAT PUMP Screen is accessible from the
CONDENSER and the EVAPORATOR Screen. The
Heat Pump Control MODE can be selected between
Heating, Cooling or Cooling & Heating mode using
the Unit Control Mode setpoint on this screen (Opera-
tor level required).
In Heating mode, the chiller controls the Leaving Con-
denser Liquid Temperature to its setpoint.
In Cooling mode, the chiller controls the Leaving
Chilled Liquid Temperature to its setpoint.
In Cooling & Heating mode the chiller controls to
whichever Leaving Temperature is closest to its
setpoint. This allows a Building Automation System the
ability to change the operation of the chiller remotely
by changing the Leaving Temperature setpoints. If the
BAS wants the chiller to run in Heating mode then it
can command the Leaving Chilled Liquid Temperature
Setpoint high. If the BAS wants the chiller to run in
Cooling mode then it can command the Leaving Con-
denser Liquid Temperature Setpoint low.
HEAT PUMP SCREEN
(Software Version C.OPT.18.04.313 and Later)
LD17919b
FIGURE 9 - HEAT PUMP SCREEN
All setpoints pertinent to this feature are maintained on
this screen.
DISPLAY ONLY
Entering Condenser Liquid Temperature
Displays the temperature of the liquid as it enters the
condenser
Leaving Condenser Liquid Temperature
Displays the temperature of the liquid as it leaves 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-

York YMC2 Specifications

General

Brand	York
Model	YMC2
Category	Chiller
Language	English