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JOHNSON CONTROLS
134
FORM 150.63-NM6 (1020)
PROBLEM
CAUSE
SOLUTION
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 discharge air
2. Compare the display with a
temperature sensor.
thermometer. Should be
/- 2 degrees. Refer
to Service section for Dis
charge Air 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. Dirty evaporator surface.
1. Contact the local YORK
Low suction pressure will
service representative.
be observed.
2. Improper CFM through the
2. Verify nominal 400 CFM/ton
evaporator coil.
air flow through evaporator
coil.
3. Low refrigerant charge.
3. Check subcooling and add
Low suction pressure will
charge as needed.
be observed.
Service and Troubleshooting
TROUBLESHOOTING (CONT’D)
Summary of Contents for YCUL0045
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