JOHNSON CONTROLS
214
FORM 201.23-NM2
ISSUE DATE: 09/25/2020
SECTION 7 - OPERATION
• VSD Comp IGBT Baseplate Temperature on a
3 compressor unit is greater than 10°F (5.6°C)
below the cutout (cutout 232°F [111.1°C] minus
10°F (5.6°C) equals 222°F [105.6°C]). When the
VSD internal ambient falls below the restart tem-
perature (cutout minus 15°F [8.3°C] equals 217°F
[102.8°C]), the fans and pump will be turned off
without a time delay.
• Pre-charge Enable 1 from the Chiller Logic Board
is ON.
• Pre-charge Enable 2 from the Chiller Logic Board
is ON.
• VSD Internal Ambient Temp more than 158°F
(70.0°C) (Cutout) – 10°F (5.6°C) equals 148°F
(64.4°C). When the Internal Ambient Temp falls
to less than 158°F (70.0°C) (Cutout) minus 15°F
(8.3°C) equals 143°F (61.7°C) the VSD cooling
fans and glycol pump will turn off.
• Condenser Fans (as needed) and VSD coolant
pump/fans will run whenever a compressor is
running. Under these conditions, the condenser
fans will run to control discharge pressure and
the VSD coolant pump/fans will run to cool the
IGBT baseplate and internal cabinet. Additional
condenser fans will be brought on, if the IGBT
baseplate temperatures or internal cabinet ambi-
ent rises to 5°F (2.8°C) below the cutout. Con-
denser fans will turn off, if the compressor turns
off provided VSD cooling is not required. The
glycol pump and cabinet fan may continue to run,
if VSD cooling is required.
• Glycol Pump and Cabinet Cooling Fans will also
run in the Service Mode if the Fan/Pump Run Bit
is Set.
REMOTE TEMPERATURE RESET CONTROL
Temperature Reset Control
Temperature Reset Control is used to reset the ac-
tual LCHLT (Leaving Chilled Liquid Temperature)
setpoint used in capacity control. There are several
ways to change the LCHLT setpoint. The first is by
re-programming the Local Cooling Setpoint under the
SETPOINTS key. This is the value the unit will control
the LCHLT to if neither of the other methods is active.
Remote Temperature Limit Reset is only possible if the
option is enabled by both the OPTIONS key selection
and in the factory programmable password protected
Unit Setup Mode.
Remote ISN Setpoint Control
The Remote Leaving Chilled Liquid Setpoint Cooling
Setpoint can be set via the ISN comms. The control
panel will only accept a remote setpoint from the ISN
if the control panel is in Remote Control Mode (un-
der the OPTIONS key). If the control panel is in Local
Control Mode, the ISN setpoint will be ignored and the
Remote Cooling Setpoint is set to the Local Cooling
Setpoint. The minimum and maximum allowable reset
values will be the same as the minimum and maximum
allowable programmable values for the Local Cooling
Setpoint. If these values are exceeded by the ISN, the
minimum or maximum value will be used.
Contact a local YORK ISN Representative for details
on ISN controls and capabilities.
Remote Temperature Reset
The Remote Leaving Chilled Liquid Cooling Setpoint
can be reset via the Remote Temperature Reset analog
input. A zero signal input (0% input) equates to a 0°F
offset to the Local Cooling Setpoint. A full scale sig-
nal input (100% input) equates to a "positive" offset to
the Local Cooling setpoint equal to the programmable
Maximum Remote Temp Reset. The offset is linear and
may be adjusted anywhere between the 0% and 100%
points. The maximum setpoint allowed is the maxi-
mum programmable Local Cooling Setpoint and will
be capped at this value, if the calculated setpoint with
temperature offset exceeds this value.
This input may be used either in Local or Remote Con-
trol Mode. This feature will only operate if enabled
under the UNIT SETUP and the OPTIONS key. The
input will be ignored if the Remote Temp Reset is dis-
abled under the OPTIONS key or if there are valid ISN
comms while in Remote Control Mode. Once a change
to the input is registered, a timer is set to the value of
the Remote Inputs Service Time as programmable un-
der the Unit Setup Mode at the factory for the default
value of 15 minutes. The low limit is 5 minutes and
the high limit is 60 minutes. The Remote input will
be ignored until this timer expires. The timer assures
that rapid changes in a remote reset signal don’t result
in poor temperature control or excessive compressor
cycling. In most instances, this timer will not need to
be changed, since reset more often than 15 minutes
will create problems with chilled liquid temperature
control. Factory Service should be contacted if a timer
change is required.
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