41
Table13 – CADM Troubleshooting
MiswiredModule Indication RecommendedTroubleshooting Action
GreenLED is not on ,
moduledoes not power up
Determineif both R and C module terminals are connected. Verify voltage in present at module’s R
andC terminals.
NOTE: The CADMrequires a constant nominal 24VACpower supply. The wiring to the module’sR
andC terminals must be directly from the controltransformer. The modulecannot receive its power
fromanother d evicetha twill interrupt the 24VAC power sup ply.See the 569J Wiring Diagram(s)
(Fig.33 and Fig.34).
GreenLED Intermittent,
modulepowers up only
when compressor runs
Determineif R and Y terminals are wired in reverse. Verify module’s R and C terminals have a con-
stantsou rce. See “NOTE” above for d etails on R and C wiring.
TRIP LED is on but system
and compressor check OK
VerifyY terminal is wired properly per the 569J wiring diagram (see Fig. 33 and Fig . 34). Verify
voltage at contactor coil falls below 0.5VAC whe n off. Verify 24VAQC is present across Y and C
whenthermostat demand signal is present. If not, R and C are reverse wired.
TRIPLED and ALERTLED
flashingtogether
VerifyR and C terminalsare supplied with 19-28VAC.
ALERTFlash Code 3
(Compressor Short Cycling)
displayed incorrectly
VerifyY termina l is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls below
0.5VACwhen off.
ALERTFlash Code 5 or 6
(Open Circuit, Missing Phase)
displayed incorrectly
Checkthat compressor T1 and T3 wires are through module’scurrent sensing holes. Verify Y ter-
minalis connected to24VAC at contactor coil.Verify voltage at contactorcoil falls below 0.5VAC
whenoff.
AlertFlash Code *
(WeldedConta ctor)
displayed incorrectly
Determine if module’s Y terminal is connected. Verify Y termina l is connected to 24VAC at contactor
coil.Verify 24VAC is present across Y and C when thermostat demand signal is present. If not,R
and C are reverse wired. Verify voltage a t contactor coil falls below 0.5VAC when off.
Compressor P rotection
CompressorOvertemperature Protection(IP) —
A thermostat installed on the compressor motor winding
reacts to excessivelyhigh winding temperatures and shuts
off the compressor.
CrankcaseHeater—
The heater minimizes absorption of liquid refrigerantby
oil in the crankcase during brief or extended shutdown
periods. The heater is wired to cycle with the compressor;
the heater is off when compressor is running, and on when
compressor is off.
The crankcase heater will operate as long as the power
circuit is energized. The main disconnect must be on to
energizethe crankcase heater.
IMPORTANT:Neve r open anyswitc h ordisconnec t
that energizes the crankcase heater unless unit is
being serviced or is to be shut down for a prolonged
period. After a prolonged shutdown on a service job,
energize the crankcase heater for 24 hours before
startingthe compressor.
AdvancedScroll TemperatureProtection (ASTP) —
See“Advanced Scroll Temperature Protection (ASTP)”on
page 25.
Low-Pressure Switch —
The 569J low-pressure switch is stem-mounted on the
suction line. Switches are all fixed, non-adjustable type.
High--PressureSwitch —
The high--pressure switch is stem mounted on the
discharge line. The switch is a fixed, non-adjustable type.
Outdoor Fans —
Each fan is supported by a formed-wire mount bolted to
the fan deck and covered with a wire guard. Fan motors
have permanently lubricated bearings.
1. Shut off unit power supply. Install lockout tag.
2. Remove outdoor fan assembly (grille, motor, and fan).
3. Loosen fan hub setscrews.
4. Adjust fan height as shown in Fig. 37.
5. Tighten setscrews to 84 in--lbs (949 N--cm).
6. Replace outdoor fan assembly.
3.6 mm +0/0/-0.8
C10103
Fig. 37 --Outdoor Fan Blade Position
Lubrication—
Fan Motors: The fan motors have sealed bearings. No
provisions are made for lubrication.
Compressor: The compressor has its own oil supply. Loss
of oil due to a leak in the system should be the only
reason for adding oil after the system has been in
operation.
569J