JOHNSON CONTROLS
186
FORM 150.67-NM2 (209)
Service and Troubleshooting
TROUBLESHOOTING
PROBLEM
CAUSE
SOLUTION
No display on panel.
1. No 115VAC to 24 VAC
1a. Check wiring and fuse
Unit will not operate.
Transformer
1FU
b. Check wiring emergency
stop contacts 5 to L of TB1
Terminal
Block.
c. Replace Control Transformer
2. No 24VAC to Microboard
2. Check wiring Control
Transformer
to
Microboard.
3. Control Transformer defective, no
3. Replace Control Transformer
24VAC
output.
4. Short in wire to temp. sensors
4. Unplug connections at IPU II
or pressure transducers.
& I/O Board to isolate.
5. Defective IPU II & I/O Board
5. Replace IPU II & I/O Board
or the Display Board.
or the Display Board.
Contact YORK
Service
before
Replacing
circuit
Boards!
“FLOW SWITCH/REM
1. No chilled liquid fl ow.
1. Check chilled liquid fl ow.
STOP NO RUN PERMISSIVE”
2. Flow switch improperly
2. Check that the fl ow switch
installed.
is installed according to
manufacturer’s
instructions.
3.
Defective
fl ow switch.
3. Replace fl ow switch.
4. Remote cycling device open.
4. Check cycling devices
connected
to
terminals
13 and 14 of the CTB1
Terminal
Block.
“LOW SUCTION PRESSURE”
1. Improper suction pressure
1. Adjust per recommended
FAULT
cutouts
adjustments.
settings.
2. Low refrigerant charge.
2. Repair leak if necessary
and
add
refrigerant.
3.
Fouled
fi lter dryer.
3. Change dryer/core.
TABLE 34 –
TROUBLESHOOTING
CONT’D
Summary of Contents for YCAL0019
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