YORK INTERNATIONAL
107
FORM 150.62-NM1
PROBLEM
CAUSE
SOLUTION
“MP / HPCO” FAULT
1. Compressor internal motor
1. Verify refrigerant charge is
protector (MP) open.
not low. Verify superheat
setting of
°
10 - 15
°
F (5.6
°
-
8.3°C). Verify correct com-
pressor rotation. Verify
compressor is not over
loaded.
2. External overload tripped.
2. Determine cause and reset.
3. HPCO switch open
3. See “High Press. Disch.”
Fault
4. Defective HPCO switch
4. Replace HPCO switch
5. Defective CR relay
5. Replace relay
COMPRESSOR(S) WON’T
1. Demand not great enough.
1. No problem. Consult
START
“Installation” Manual to aid
in understanding compres-
sor operation and capacity
control.
2. Defective water temperature
2. Compare the display with a
sensor.
thermometer. Should be
/- 2 degrees. Refer
to Service section for RWT/
LWT temp./voltage table.
3. Contactor/Overload failure
3. Replace defective part.
4. Compressor failure
4. Diagnose cause of failure
and replace.
LACK OF COOLING EFFECT
1. Fouled evaporator surface.
1. Contact the local YORK
Low suction pressure will
service representative.
be observed.
2. Improper flow through the
2. Reduce flow to within chiller
evaporator.
design specs. See Limita-
tions in Installation section.
3. Low refrigerant charge.
3. Check subcooling and add
Low suction pressure will
charge as needed.
be observed.
3
Summary of Contents for YCAL0014SC
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Page 116: ...YORK INTERNATIONAL 116 ELEMENTARY DIAGRAM YCAL0034SC FIG 13 ELEMENTARY DIAGRAM Wiring Diagrams...
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Page 130: ...APPENDIX 1 DIMENSIONS FIG 19 TYPE CP 1 FIG 20 TYPE CP 2 LD03839 LD03840 Appendix 1 Isolators...
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