249
Energize and
switch on
IPM protection
occurs after the
machine has run for
a period of time?
Use AC voltmeter
to measure the
voltage between
terminal L and N
on the wiring
board XT)
If the voltage
between terminal L
and N on wiring
board XT is within
210VAC~250VAC?
Check the supply
voltage and
restore it to
210VAC~250VAC
Voltage between
the two ends of
electrolytic
capacitor (test3) is
higher than 250V
Start and run the
unit. Before
protection occurs,
use DC voltmeter to
measure the voltage
between the two
ends of electrolytic
capacitor on control
panel AP1 (test3)
If the unit can
work
normally?
Please confirm:
1. If the indoor and
outdoor heat
exchangers are
dirty? If they are
obstructed by other
objects which affect
the heat exchange
of indoor and
outdoor unit.
2. If the indoor and
outdoor fans are
working normally?
3. If the environment
temperature is too
high, resulting in
that the system
pressure is too high
and exceeds the
permissible range?
4. If the charge
volume of
refrigerant is too
much, resulting in
that the system
pressure is too
high?
5. Other conditions
resulting in that the
system pressure
becomes too high.
The connection
of capacitor C2
is loose.
Stop the unit and
disconnect the power
supply. Then, check
the
connection
of
capacitor
C2
according to Electrical
Wiring Diagram.
Reconnect the
capacitor C2 according
to Electrical Wiring
Diagram. Then,
energize and start the
unit.
Remove the wires
on the two ends of
capacitor C2. Then,
use
capacitance
meter to measure
the capacitor C2.
Verify as per the
Parameters Sheet.
Stop the unit and
disconnect the power
supply. Wait 20 minutes,
or use DC voltmeter to
measure the voltage
between the two ends of
capacitor C2, until the
voltage is lower than 20V
If capacitor
C2 is failed?
Replace the capacitor
C2. Then, energize
and start the unit.
Replace the
control panel AP1
Take corrective actions
according to Technical
Service Manual, and
then energize and start
the unit.
If there is any
abnormality
described above?
Refer to the
Electrical Wiring
Diagram and check
if the connection
between AP1 and
COMP is loose and if
the connection order
is correct.
Replace the
control panel AP1
If the connection
between AP1 and
COMP is unsecure
or the connection
order is wrong?
Connect the control panel
AP1 and compressor
COMP correctly according
to the Electrical Wiring
Diagram. Then, energize
and start the unit.
Use ohmmeter to
measure the resistance
between the three
terminals on compressor
COMP, and compare the
measurements with the
compressor resistance on
Service Manual.
If the
resistance is
normal?
Use ohmmeter to
measure the resistance
between the two
terminals of compressor
COMP and copper tube.
Replace the
compressor
COMP
Resistance higher
than 500M
Ω
?
Replace the
control panel
AP1
END
Y
N
Y
N
Y
N
Y
If the unit can
work
normally?
Y
If the unit can
work
normally?
Y
N
N
Y
N
If the unit can
work
normally?
Y
Y
N
N
If the unit can
work
normally?
Y
Y
N
N
N
N
Y
Troubleshooting Guide
Summary of Contents for EVJC 12
Page 2: ...74 74...
Page 30: ...102...
Page 32: ...104 www johnsoncontrols com...
Page 34: ...106 by johnson controls 2...
Page 46: ...118...
Page 48: ...120 www johnsoncontrols com...
Page 49: ...121 High Wall EVHC 09 to 12 DSAAAR SERVICE MANUAL SM EVHC D 09 12GB 05 10 EVHC 09 EVHC 12...
Page 65: ...137 LULQJ LDJUDP Schematic Diagram Indoor Unit Schematic Diagram...
Page 66: ...138 Schematic Diagram Outdoor Unit...
Page 69: ...141 TOP VIEW Schematic Diagram BOTTOM VIEW 1 3 4 5 6 2 7 8 9 10 11 12 Outdoor Unit...
Page 113: ...185 Exploded View Exploded View Indoor Unit...
Page 114: ...186 Exploded View Outdoor Unit...
Page 118: ...190 High Wall EVHC 18 to 24 DSAAAR SERVICE MANUAL SM EVHC D 18 24GB 05 10 EVHC 18 EVHC 24...
Page 132: ...204 LPHQVLRQV Dimensions QGRRU 8QLW Tube exit Air inlet Right Left Ceiling W D H 02 18K 24K...
Page 133: ...205 890 340 955 560 380 424 700 60cm 60cm 60cm 60cm LPHQVLRQV Outdoor Unit Bolt Nut Spanner...
Page 140: ...212 TOP VIEW Schematic Diagram BOTTOM VIEW 1 2 3 4 5 6 7 8 9 7 8 9 10 11 12 13 1 2 3 4 5 6 10...
Page 142: ...214 Schematic Diagram Key testing spot bottom...
Page 197: ...269 Exploded View Exploded View Indoor Unit 78 Model EVKC 18 DS...
Page 198: ...270 Exploded View Model EVKC 24 DS 79...
Page 199: ...271 Exploded View Outdoor Unit 80...
