Figure 128 - Vsd Glycol Pump; Figure 129 - Original - Obsolete P/N 031-02477-000 - York YCIV0157 Installation Operation & Maintenance

Form 201.23-NM2
Issue date: 12/19/2023
VSD GLYCOL
PUMP

Figure 128 - VSD glycol pump

The VSD fan and glycol pump will run if any of the
following conditions listed below are true, provided
the VSD has been powered up for less than 30 seconds
and the pump has not run in the last 30 seconds. The 30
second limitations prevent pump motor overheating.
• 2 and 4 Compressor Baseplate temp is more than
Cutout (218°F) minus 10°F.
• 3 Compressor IGBT Baseplate temp is more than
Cutout (232°F) minus 10°F.
• 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 Cutout
minus 10°F.
• Any compressor is running.
• Service Mode Fan/Pump Run is enabled.
The VSD fan/glycol pump will turn off when ALL of
the following conditions are true:
• Compressor 1/3 IGBT Baseplate temp is less than
Cutout minus 15°F.
• Compressor 2/4 IGBT Baseplate temp is less than
Cutout minus 15°F.
Johnson Controls
• Pre-charge Enable 1 from the Chiller Logic Board
is OFF.
• Pre-charge Enable 2 from the Chiller Logic Board
is OFF.
• VSD Internal Ambient Temp less than Cutout mi-
nus 15°F.
• No compressors are running.
• Service Mode Fan/Pump is disabled.
In some cases, the condenser fans may be
turned on by the microprocessor, when
no compressors are running, to keep the
power components and Control/VSD
Cabinet from overheating.
IGBT module baseplate temperature sensing
LD10635
Each IGBT module has an internal 5 Kohm thermistor
built in to measure the temperature of the module. Up
to 4 thermistors are connected to the VSD Logic Board
(one per compressor). The highest module temperature
of compressors 1 and 3 are sent to the logic board along
with the highest module temperature of compressors
2 and 4. If the temperature exceeds the software trip
point, the unit will shut down on a safety. See "High
Baseplate Temperature Fault" (Page 241) for details.

Figure 129 - Original - obsolete P/N 031-02477-000

Section 8 - Micropanel
LM 34
SENSOR
8
LD10615
225