FCM/A5, FEV, FJM, FEM4, FHMA5, FMA4/5, FM(C,U)5, FS(A,M,U)4, FTMA5, F(V,X)M4, F5M4, REM4, WA(H,M,P,X) WB(G,H)L, WC(G,H)L: Service and Maintenance
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
25
Flashing 8
Verify wiring of all "Y" and "W" wires in the applicable wiring diagram.
Care and Maintenance
To continue high performance, and minimize possible equipment failure,
it is essential periodic maintenance be performed on this equipment.
The ability to properly perform maintenance on this equipment requires
certain mechanical skills and tools. The only consumer service
recommended or required is filter maintenance (Filter Assembly on p25)
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect and clean or replace air filter each month or as required.
2. Inspect cooling coil, drain pan, and condensate drain each cooling
season for cleanliness. Clean as necessary.
3. Inspect blower motor and wheel for cleanliness each heating and
cooling season. Clean as necessary.
4. Inspect electrical connections for tightness and controls for proper
operation each heating and cooling season. Service as necessary.
Filter Assembly
To clean or replace air filter, push plastic connectors toward center of
unit and remove filter access panel outward. Push filter up and back into
unit. Then slide filter out.
Clean filter by using cold water and mild detergent. Rinse and allow
filter to dry. No oiling or coating of filter is required.
New filters are available from your local distributor. Place filter in slot
with cross-mesh binding up or facing cooling coil and replace filter
access panel.
Cooling Coil, Drain Pan, and Condensate Drain
The cooling coil is easily cleaned when it is dry. Inspect the coil and
clean (if necessary) before each cooling season. To check or clean
cooling coil, remove coil access panel. If coil is coated with dirt or lint,
vacuum it with a soft brush attachment.
Be careful not to bend coil fins. If coil is coated with oil or grease, clean
it with a mild detergent and water solution. Rinse coil thoroughly with
clear water. Be careful not to splash water on insulation.
Inspect drain pan and condensate drain at the same time cooling coil is
checked. Clean drain pan and condensate drain by removing any foreign
matter from pan. Flush pan and drain tube with clear water.
If drain tube is restricted, it can generally be cleared by high-pressure
water. Cut plastic line and work outside condensate pan and away from
coil to clean drain tube.
Blower Motor and Wheel
Clean blower motor and wheel when cooling coil is cleaned.
To clean blower motor or blower wheel:
1. Remove blower access panel.
2. Remove motor leads from fan coil control. Note lead location for
ease of reassembly.
3. Remove the two outside screws holding blower/motor assembly
against blower deck flange and slide assembly out of cabinet.
• Servicing the blower assembly may require the removal of two
screws that attach the blower housing to the fan deck. It is not
necessary to reinstall these screws after service.
4. (If applicable) Remove screw in strap holding motor capacitor to
blower housing and slide capacitor out from under strap. Remove
screw with green wire from blower housing. Mark blower wheel,
motor, and motor support in relation to blower housing before
disassembly to ensure proper reassembly. Note position of blades
on wheel.
5. Loosen setscrew holding blower wheel onto motor shaft.
6. Remove the three bolts holding motor mount to blower housing and
slide motor and mount out of housing. Further disassembly should
not be necessary as adequate clearance is available.
7. Remove blower wheel from housing by removing cutoff plate from
blower housing outlet. Note wheel orientation and cutoff location
Table 14 – Flash Code Chart
Yellow LED Reason Mode
Solid Normal Operation Normal Operation
Flashing 1 Sensor >= 20% LFL Dissipation
Flashing 2 Sensor Open Dissipation
Flashing 3 Normal Mitigation after Leak Dissipation
Flashing 4 No Power to G Output Dissipation with no Blower
Flashing 5 Fault with A2L Digital Sensor Dissipation
Flashing 6 Test Button Stuck (>30 s) Dissipation
Flashing 7 Y or W Wiring Inverted Normal Operation
Flashing 8 Y or W Shorted Normal Operation
Table 15 – Wall-Hung FMA5 Control Board Test Functions
LED Status Description
Steady ON Normal Operation
OFF Power Supply Failure
Steady Flashing Dissipation Mode Active
3 Flash / Cycle A2L Sensor Error
4 Flash / Cycle A2L Sensor Communication Error
8 Flash / Cycle A2L Sensor Over Service Life
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Disconnect all power to the unit before servicing the field wires or
removing the control package. The disconnect (when used) on the
access panel does not disconnect power to the line side of the
disconnect, but does allow safe service to all other parts of the unit.
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing and gloves when handling parts.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage.
Do not use caustic household drain cleaners in the condensate pan or
near the coil. Drain cleaners can quickly destroy a coil.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury or death.
Disconnect electrical power before removing any access panels. Lock
out and tag switch with a suitable warning label.
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