York YCAL Series - Page 156

JOHNSON CONTROLS
156
FORM 150.66-NM3
ISSUE DATE: 09/25/2020
SECTION 9 - SERVICE AND TROUBLESHOOTING
PROBLEM CAUSE SOLUTION
LACK OF COOLING EFFECT
1. Fouled evaporator surface Low
suction pressure will be observed.
1. Contact the local Johnson
Controls Service representative.
2. Improper ow through the evaporator. 2. Reduce ow to within chiller
design specs. See “Limitations”
in “Installation” section.
3. Low refrigerant charge. Low suction
pressure will be observed.
3. Check subcooling and add
charge as needed.
TABLE 32 – TROUBLESHOOTING (CONT’D)