Table 19: Programmable
Button Access Description
Unit Control Mode Operator
This setpoint can only be changed when the chiller is
stopped. This setpoint sets the Heat Pump operation to
either Cooling (default), Heating or Cooling & Heating
operation.
Local Heating
Temperature – Setpoint
Operator
This allows the user to define the Local Mode Heat Pump
Leaving Condenser Liquid Temperature Setpoint that is
to be maintained in Heating mode. It is programmable
over the range of 65.0°F to 122.0°F [235 PSIG Condenser]
[150.0°F 350 PSIG Condenser] (default 95.0°F). A remote
device can provide an analog signal (0 to 20 mA, 4 to 20 mA,
0 to 10 VDC, 2 to 10 VDC) in Analog Remote mode, or a PWM
signal in Digital Remote mode that changes the setpoint by
creating an offset below this setpoint as detailed in the Local
Leaving Condenser Liquid Temperature Range description
below. A SC-Equip Gateway (in ISN BAS Remote mode) can
set the setpoint through a serial communications interface.
In this case, the incoming setpoint is not an offset below the
local setpoint but is the control setpoint value.
Local Heating
Temperature – Range
Operator
This is the range over which an analog signal (0 to 20 mA,
4 to 20 mA, 0 to 10 VDC or 2 to 10 VDC) in Analog Remote
mode or a PWM signal (1 to 11 seconds) in Digital Remote
mode, can reset the Leaving Condenser Liquid Temperature
Setpoint below the operator programmed local setpoint
(see above) while the Heat Pump is in Heating mode.
Programmable values are 10, 20, 30 or 40ºF (default 10). This
number is subtracted from the local setpoint to create a
range over which the remote device can reset the setpoint.
For example, if this setpoint is set for 10°F and the local
setpoint is 90°F, the remote device can set the Leaving
Condenser Liquid Temperature Setpoint over the range of
90°F to 80°F.
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