Troubleshooting - York ZF 180 Series Installation Manual

1061903-XIM-A-0713

Troubleshooting

Troubleshooting of components may require opening
the electrical control box with the power connected to
the unit. Use extreme care when working with live
circuits! Check the unit nameplate for the correct line
voltage and set the voltmeter to the correct range before
making any connections with line terminals.
For troubleshooting of optional VFD, disconnect all
power to the drive. Be aware that high voltages are
present in the drive even after power has been
disconnected. Capacitors within the drive must be
allowed to discharge before beginning service.
When not necessary, shut off all electric power to the
unit prior to any of the following maintenance
procedures so as to prevent personal injury.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation which could cause injury to person
and/or damage unit components. Verify proper
operation after servicing.
Cooling Troubleshooting Guide
On calls for cooling, if the compressors are operating but the
supply air blower motor does not energize after a short delay
(the room thermostat fan switch is in the "AUTO" position):
1. Turn the thermostat fan switch to the ON position. If the
supply air blower motor does not energize, go to Step 2.
2. If the supply air blower motor does not energize when the
fan switch is set to ON, check that line voltage is being
supplied to the contacts of the M3, contactor, and that the
contactor is pulled in. For units with VFD, check that line
voltage is being supplied to the M3-Auxiliary contacts
Check for loose wiring between the contactor and the
supply air blower motor.
3. If M3 is pulled in and voltage is supplied to M3, lightly touch
the supply air blower motor housing. If it is hot, the motor
may be off on internal protection. Cancel any thermostat
calls and set the fan switch to AUTO. Wait for the internal
overload to reset. Test again when cool.
4. If M3 is not pulled in, check for 24 volts at the M3 coil. If 24
volts are present at M3 but M3 is not pulled in, replace the
contactor.
5. Failing the above, if there is line voltage supplied at M3, M3
is pulled in, and the supply air blower motor still does not
operate, replace the motor.
For units with VFD, if there is line voltage supplied at M3,
M3 is pulled in, and the blower motor does not operate,
check all power & control wiring connections to and from
42
the drive and for any fault/warning messages displayed on
the drive's digital display (refer to the drive user manual for
full descriptions, if necessary). Clear any fault by pressing
'RESET' on the drive's keypad and take any corrective
action as needed. If the motor still does not operate,
replace the motor.
6. If 24 volts is not present at M3, check that 24 volts is
present at the UCB supply air blower motor terminal,
"FAN". If 24 volts is present at the FAN, check for loose
wiring between the UCB and M3.
7. If 24 volts is not present at the "FAN" terminal, check for 24
volts from the room thermostat. If 24 volts are not present
from the room thermostat, check for the following:
a. Proper operation of the room thermostat (contact
between R and G with the fan switch in the ON position
and in the AUTO position during operation calls).
b. Proper wiring between the room thermostat and the
UCB, and
c. Loose wiring from the room thermostat to the UCB
8. If 24 volts is present at the room thermostat but not at the
UCB, check for proper wiring between the thermostat and
the UCB, i.e. that the thermostat G terminal is connected to
the G terminal of the UCB, and for loose wiring.
9. If the thermostat and UCB are properly wired, replace the
UCB.
On calls for cooling, the supply air blower motor is operating but
compressor #1 is not (the room thermostat fan switch is in the
"AUTO" position):
1. If installed, check the position of the economizer blades. If
the blades are open, the economizer is providing free
cooling and the compressors will not immediately operate. If
both stages of cooling are requested simultaneously and the
economizer provides free cooling, following a short delay
compressor #1 will be energized unless it is locked out. If
compressor #1 is locked out, compressor #2 is energized.
Compressor #2 is always energized in place of compressor
#1 when compressor #1 is requested but locked out.
2. If no economizer is installed or the economizer is not
opening to provide free cooling and compressor #1 does
.
not energize on a call for cooling, check for line voltage at
the compressor contactor, M1, and that the contactor is
pulled in. Check for loose wiring between the contactor and
the compressor.
3. If M1 is pulled in and voltage is supplied at M1, lightly touch
the compressor housing. If it is hot, the compressor may be
off on inherent protection. Cancel any calls for cooling and
wait for the internal overload to reset. Test again when cool.
4. If M1 is not pulled in, check for 24 volts at the M1 coil. If 24
volts are present and M1 is not pulled in, replace the
contactor.
5. Failing the above, if voltage is supplied at M1, M1 is pulled
in, and the compressor still does not operate, replace the
compressor.
6. If 24 volts is not present at M1, check for 24 volts at the
UCB terminal, C1. If 24 volts is present, check for loose
wiring between C1 and the compressor contactor.
Johnson Controls Unitary Products