Carrier 38AUQ appendix Lubrication, Outdoor Coil Maintenance and Cleaning Recommendation

Table 15 — CADM Troubleshooting

Miswired Module Indication	Recommended Troubleshooting Action
Green LED is not on,	Determine if both R and C module terminals are
module does not power up	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. 19,
	the 38AUQ Wiring Diagram.
Green LED Intermittent,	Determine if R and Y terminals are wired in reverse. Verify
module powers up only	module’s R and C terminals have a constant source. See
when compressor runs	“NOTE” above for details on R and C wiring.
TRIP LED is on but system	Verify Y terminal is wired properly per the 38AUQ wiring
and compressor check OK	diagram (see Fig. 19). Verify voltage at contactor coil falls
	below 0.5VAC when off. Verify 24VAQC is present across
	Y and C when thermostat demand signal is present. If not,
	R and C are reverse wired.
TRIP LED and ALERT LED	Verify R and C terminals are supplied with 19-28VAC.
flashing together
ALERT Flash Code 3	Verify Y terminal is connected to 24VAC at contactor coil.
(Compressor Short Cycling)	Verify voltage at contactor coil falls below 0.5VAC when
displayed incorrectly	off.
ALERT Flash Code 5 or 6	Check that compressor T1 and T3 wires are through
(Open Circuit, Missing Phase)	module’s current sensing holes. Verify Y terminal is
displayed incorrectly	connected to 24VAC at contactor coil. Verify voltage at
	contactor coil falls below 0.5VAC when off.
Alert Flash Code *	Determine if module’s Y terminal is connected. Verify Y
(Welded Contactor)	terminal is connected to 24VAC at contactor coil. Verify
displayed incorrectly	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.

Lubrication

FAN MOTORS have sealed bearings. No provisions are made for lubrication.

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.

Outdoor Coil Maintenance and Cleaning Recommendation

Routine cleaning of coil surfaces is essential to maintain proper operation of the unit. Elimination of contamination and remov- al of harmful residues will greatly increase the life of the coil and extend 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.

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 applied in the direction of the fins. Coil surfaces can be easily damaged (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 water rinse.

Periodic Clean Water Rinse

A periodic clean water rinse is very beneficial for coils that are applied in coastal or industrial environments. However, it is very important that the water rinse is made with very low ve- locity water stream to avoid damaging the fin edges. Monthly cleaning as described below is recommended.

PERSONAL INJURY AND UNIT DAMAGE HAZARD

Failure to follow this caution may result in personal injury or equipment damage.

Only approved cleaning is recommended.

Routine Cleaning of Indoor Coil Surfaces

Periodic cleaning with Totaline® environmentally sound coil cleaner is essential to extend the life of coils. This cleaner is available from Carrier Replacement Components Division as part number P902-0301 for one gallon container, and part num- ber P902-0305 for a 5 gallon container. It is recommended that all coils, including standard aluminum, pre-coated, copper/cop- per or E-coated coils be cleaned with the Totaline environmen- tally 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.

Avoid the use of

•coil brighteners

•acid cleaning prior to painting

•high pressure washers

•poor quality water for cleaning

Totaline environmentally sound coil cleaner is nonflammable, hypoallergenic, non bacterial, and a USDA accepted biode- gradable agent that will not harm the coil or surrounding com- ponents such as electrical wiring, painted metal surfaces, or in- sulation. Use of non-recommended coil cleaners is strongly discouraged since coil and unit durability could be affected.

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