JOHNSON CONTROLS
40
FORM 160.84-OM1
ISSUE DATE: 9/21/2017
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
Leaving Condenser Liquid Temperature Cy-
cling Offset – Shutdown
Access Level Required: 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 Heat-
ing 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 (de-
fault 1) above the setpoint, to a maximum of 125°F.
Anytime the Leaving Condenser Liquid Tem-
perature Setpoint is decreased, this shutdown
threshold becomes 125°F for the next 10 min-
utes. 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 Leav-
ing 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 Cy-
cling Offset – Restart
Access Level Required: OPERATOR
This setpoint allows the user to specify the Leav-
ing 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 program-
mable 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.
Heating LCHLT Shutdown
Access Level Required: OPERATOR
In Heating mode, the existing LEAVING CHILLED
LIQUID TEMPERATURE – LOW TEMPERATURE
cycling shutdown logic includes an additional check to
its existing logic that will cause a shutdown in Heat-
ing mode. This setpoint allows the user to specify
the Leaving Chilled Liquid Temperature at which the
Heat Pump will shut down on LEAVING CHILLED
LIQUID – LOW TEMPERATURE cycling shutdown
when the Heat Pump is operating in Heating mode.
The low limit for this setpoint is the higher of (Leav-
ing Condenser Liquid Temperature Setpoint minus 86°
F) or (Cooling mode Leaving Chilled Liquid Tempera-
ture Shutdown Temperature). The high limit for this
setpoint is the Leaving Condenser Liquid Temperature
Setpoint. The default is (Leaving Condenser Liquid
Temperature Setpoint minus 60°F). The high limit is
the selected Heating Setpoint.
The Heat Pump will restart when the Leaving Chilled
Liquid Temperature exceeds the shutdown temperature
by 5°F.
NAVIGATION
Home
Access Level Required: VIEW
Returns user to HOME Screen
Evaporator
Access Level Required: VIEW
Returns user to EVAPORATOR Screen
Condenser
Access Level Required: VIEW
Returns user to CONDENSER Screen
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