Johnson Controls YORK PYT 0330 Instruction Manual page 15

HYP model drives normal operation with no additional service required
The service definitions are temperature based.
• The rectifier baseplate or inverter baseplate must be below the values outlined in
Table 5: Service level
Drive model
490, 490A, 612A, 730A
774, 1278A (380 VAC to 414 VAC)
1278A (460 VAC)
• There may be a noticeable color change of the inhibitor, which may no longer appear blue.
Color change is normal and expected.
• There may be an odor present in the reservoir. This is also considered normal if there is no
increase in operating temperatures beyond the limits previously outlined in
HYP model drives operational indications that require additional service
The potential additional service requirements are temperature based.
If the rectifier baseplate or inverter baseplate temperatures exceed the limits in
not fault on high baseplate temperature faults, complete the following steps in order:
Table 6: Service level
Drive model
490, 490A, 612A, 730A
774, 1278A (380 VAC to 414 VAC)
1278A (460 VAC)
1. Inspect the drive heat exchanger for cleanliness and clean if necessary.
2. Clean the sediment trap if applicable.
3. Determine if the condenser waterbox design pressure (DP) is greater than 6 ftH
inspect the condenser water piping for blockages to and from the drive heat exchanger.
4. Determine if the entering condenser water temperature exceeded the chiller design value.
5. If steps 1 through 4 do not resolve the high operating temperature, contact your local Johnson
Controls Service Team.
Chillers with YORK Liquid-Cooled Variable Speed Drives and Starters
Rectifier baseplate
temperature
160°F (71.1°C)
140°F (60.0°C)
120°F (48.9°C)
Rectifier baseplate
temperature
160°F (71.1°C)
140°F (60.0°C)
120°F (48.9°C)
© 2025 Johnson Controls. All rights reserved.
Table 5:
Inverter baseplate
temperature
160°F (71.1°C)
150°F (65.6°C)
140°F (60.0°C)
Table 5.
Table 6 and does
Inverter baseplate
temperature
160°F (71.1°C)
150°F (65.6°C)
140°F (60.0°C)
O. If it is not,
2
15