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MISWIRED MODULE INDICATION
Green LED is not on, module does not power up
Green LED Intermittent, module powers up only
when compressor runs
TRIP LED is on but system and compressor check
OK
TRIP LED and ALERT LED
flashing together
ALERT Flash Code 3 (Compressor Short Cycling)
displayed incorrectly
ALERT Flash Code 5 or 6 (Open Circuit, Missing
Phase) displayed incorrectly
Alert Flash Code *
(Welded Contactor)
displayed incorrectly
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. 28.
5.
Tighten setscrews to 84 in.-lb (949 N-cm).
6.
Replace outdoor fan assembly.
3.6 mm +0/0/-0.8
Fig. 28 — 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 sys-
tem has been in operation.
Outdoor
Coil
Maintenance
Recommendation
Routine cleaning of coil surfaces is essential to maintain proper
operation of the unit. Elimination of contamination and removal of
harmful residues will greatly increase the life of the coil and ex-
tend the life of the unit. The following maintenance and cleaning
procedures are recommended as part of the routine maintenance
activities to extend the life of the coil.
Table 15 — CADM Troubleshooting
RECOMMENDED TROUBLESHOOTING ACTION
Determine if both R and C module terminals are connected. Verify voltage in present at
module's R and C terminals.
NOTE: The CADM requires a constant nominal 24VAC power supply. The wiring to the
module's R and C terminals must be directly from the control transformer. The module
cannot receive its power from another device that will interrupt the 24VAC power supply.
See Fig. A-F in Appendix B for the 38AUQ power wiring diagrams.
Determine if R and Y terminals are wired in reverse. Verify module's R and C terminals
have a constant source. See "NOTE" above for details on R and C wiring.
Verify Y terminal is wired properly per the 38AUQ wiring diagram (see Fig. A-F in
Appendix B). Verify voltage at contactor coil falls below 0.5VAC when off. Verify 24VAC is
present across Y and C when thermostat demand signal is present.
If not, R and C are reverse wired.
Verify R and C terminals are supplied with 19-28VAC.
Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil
falls below 0.5VAC when off.
Check that compressor T1 and T3 wires are through module's current sensing holes. Verify
Y terminal is connected to 24VAC at contactor coil. Verify voltage at contactor coil falls
below 0.5VAC when off.
Determine if module's Y terminal is connected. Verify Y terminal 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 at contactor coil falls below
0.5VAC when off.
REMOVE SURFACE LOADED FIBERS
Surface loaded fibers or dirt should be removed with a vacuum
cleaner. If a vacuum cleaner is not available, a soft non-metallic
bristle brush may be used. In either case, the tool should be ap-
plied in the direction of the fins. Coil surfaces can be easily dam-
aged (fin edges can be easily bent over and damage the coating of
a protected coil) if the tool is applied across the fins.
NOTE: Use of a water stream, such as a garden hose, against a
surface loaded coil will drive the fibers and dirt into the coil. This
will make cleaning efforts more difficult. Surface loaded fibers
must be completely removed prior to using low velocity clean wa-
ter rinse.
PERIODIC CLEAN WATER RINSE
A periodic clean water rinse is very beneficial for coils that are ap-
plied in coastal or industrial environments. However, it is very im-
portant that the water rinse is made with very low velocity water
stream to avoid damaging the fin edges. Periodic cleaning as de-
scribed below is recommended.
ROUTINE CLEANING OF INDOOR COIL SURFACES
Periodic cleaning with Totaline
cleaner is essential to extend the life of coils. This cleaner is avail-
able from Carrier Replacement Components Division as part
number P902-0301 for one gallon container, and part number
and
Cleaning
P902-0305 for a 5 gallon container. It is recommended that all
coils, including standard aluminum, pre-coated, copper/copper or
e-coated coils be cleaned with the Totaline environmentally sound
coil cleaner as described below. Coil cleaning should be part of the
unit's regularly scheduled maintenance procedures to ensure long
life of the coil. Failure to clean the coils may result in reduced
durability in the environment.
30
CAUTION
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this caution may result in personal injury or
equipment damage.
Only approved cleaning is recommended.
®
environmentally sound coil
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