Service And Maintenance; Troubleshooting - Carrier 40KMC Series Installation Instructions Manual

PERSONAL INJURY AND/OR []NIT DAMAGE
HAZARD
Failure to follow this caution may result in personal injury
and/or equipment damage or improper operation.
Never operate unit without a filter or with grille removed.
SERVICE AND MAINTENANCE
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF
position. There may be more than 1 disconnect switch.
Lock out and tag switch with a suitable warning label.
Remove unit grille, filter, and
lubricating, or replacing parts.
Minimum Maintenance
condensate pan for cleaning,
1. Check, clean, or replace air filter each month or as required.
2. Check cooling coil, drain pan, condensate trap, and con-
densate drain pan each cooling season for cleanliness. Clean
as necessary.
3. Check fan motor and wheel for cleanliness each heating and
cooling season.
4. Check electrical connections for tightness and controls for
proper operation each heating and cooling season. Service
as necessary.
Service
TO CLEAN OR REPLACE AIR FILTERS
1. Place a plastic sheet on the floor to catch any water that may
spill from drain pan.
2. Slide filter out.
3. Vacuum clean or wash filter with soapy water. Rinse and let
air dry. If filter needs replacing, filters are available from a
local dealer.
[]NIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Operating the system with dirty air filters may damage the
indoor unit and can cause reduced cooling performance,
intermittent system operation, frost build-up on the indoor
coil, and blown fuses. Inspect and clean or replace the air
filters monthly.
TO CLEAN OR REPLACE DRAIN PAN
1. Place a plastic sheet on the floor to catch any water that may
spill from drain pan.
2. Remove the air intake and distribution assembly. Remove
the condensate water in the drain pan by pulling out the rub-
ber drain plug and letting water drain into a 3-gallon buck-
et.
[]NIT DAMAGE HAZARD
Failure to follow this caution may result in personal injury
and/or equipment damage or improper operation.
Do not use a screw driver to pry drain pan out of assembly.
3. Remove screws holding the drain pan. Carefully hold the
drain pan to remove it from the assembly.
4. Re-install the drain pan using the appropriate number of
screws. Center and align the metal fan inlet orifice with the
fan. Ensure the fan spins freely.
TROUBLESHOOTING
FAULT CODE -- Once a failure occurs with the indoor unit in
operation, the green LED on the indoor unit flashes at intervals of
0.5 seconds. The fault code is deduced from the number of times
the green LED flashes, blocking unit operation.
Table 14 - Green LED (Indoor []nit Fault)
CODE DESCRIPTION
3 Room air sensor fault
4 Indoor unit coil sensor fault
14 Outdoor unit air sensor fault
[]SING THE EMERGENCY BUTTON -- The Emergency
button is for use by a qualified service technician only. The
Emergency button is for use when the room controller is
inoperative. Use a screwdriver to press the emergency button
through the metal protection grille. See Fig. 45.
Emergency Operation -- When the unit is in the OFF mode and
the Emergency button is pressed for 5 seconds, the unit will
operate as follows:
• Automatic mode
• Temperature preset to 72°F (22.2°C)
• Automatic fan speed
• Louvers set automatically according to the operating mode
• Timer flmction is cancelled
• Buzzer beeps
When the unit is ON and the Emergency button is pressed for 5
seconds, the unit will operate as follows:
• The unit is turned off
• Buzzer beeps
When a signal is received by the remote control, the unit operates
accordingly.
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A09553
Fig. 45 - Warning Lamps and Emergency Button
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