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Table 11 – CADM Troubleshooting

Miswired Module Indication Recommended Troubleshooting Action

Green LED is not on,

module does not power up

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 Figs. 18 and 19, the 38AU Q Wiring

Diagram.

Green LED Intermittent,

module powers up only

when compressor runs

Determine if R and Y terminals are wired in reverse. Verify module’s R and C

terminals have a constant source. See “NOTE”abovefordetailsonRandC

wiring.

TRIP LED is on but system

and compressor check OK

Verify Y terminal is wired properly per the 38AUQ wiring diagram (see Figs. 18

and 19). Verify voltage at contactor coil falls below 0.5VAC when off. Verify

24VAQC is p resent across Y and C when thermostat demand signal is present.

If not, R and C are reverse wired.

TRIP LED and ALERT LED

flashing together

Verify R and C terminals are supplied with 19-28VAC.

ALERT Flash Code 3

(Compressor Short Cycling)

displayed incorrectly

Verify Y terminal is connected to 24VAC at contactor coil. Verify voltage at

contactor coil falls below 0.5VAC when off.

ALERT Flash Code 5 or 6

(Open Circuit, Missing Phase)

displayed incorrectly

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.

Alert Flash Code *

(Welded Contactor)

displayed incorrectly

Determine if module’s Y terminal is connected. Verify Y terminal is connected to

24V AC 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.

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. 31.

5. Tighten setscrews to 84 in--lbs (949 N--cm).

6. Replace outdoor fan assembly.

3.6 mm +0/0/-0.8

C10103

Fig. 31 -- 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.

Outdoor Coil Maintenance and Cleaning

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 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 velocity water stream to avoid damaging

the fin edges. Periodic cleaning as described below is

recommended.

38AUQ

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 47 48

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