York VSD 292, Operation Manual

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JOHNSON CONTROLS
44
FORM 160.00-O4
ISSUE DATE: 07/31/2019
SECTION 6 - VSD FREQUENTLY ASKED QUESTIONS
ing the internal end stops, will reduce the amount
of vane action for the same period of operation.
• Verify that the condenser is clean.
• Verify that the liquid level control is working
properly, and maintaining a refrigerant level in
the condenser.
• Ensure that the condenser water temperature is
proper for the load on the chiller. In many cases,
the condenser water temperature is still at 85°F.
Failure to reduce speed may also be due to the system
having been placed in Manual Speed when in VSD
Service Mode.
Do I have a problem with my coolant? The pink
color is no longer visible?
The coolant normally has a pink or rose color when
new. After several months of operation, this color may
dissipate, and the coolant may appear almost colorless.
The lack of the color in the coolant does not necessarily
indicate a problem. Most colorless samples test above
1000 PPM nitrite, which is normal. There is no need to
flush the system unless you find the coolant becoming
opaque or cloudy. In this case we suggest you obtain a
sample for analysis, then flush the system with coolant
and install fresh coolant. The coolant must be changed
every year regardless of color or test results. The cool-
ant is required to be changed every year.