11
Blower Motor & Assembly
- Inspect the blower assembly and
motor mounting brackets for tightness and corrosion. Correct
deficiencies if necessary. The blower motor contains sealed
bearings and under normal operating conditions, no maintenance
is necessary for the life of the equipment.
Cooling Coil
- Inspect the cooling coil, drain pan, and condensate
drain at the beginning of each cooling season for cleanliness.
Clean these components as necessary using a mild detergent and
water. After cleaning, flush the coil, drain pan, and condensate
drain to remove all detergent.
IMPORTANT:
Use caution when cleaning these components
so that the insulation does not get wet.
TROUBLESHOOTING
If the air handler fails to operate, check the following:
• Is the electric turned on?
• Is the thermostat operating properly?
• Are the blower compartment door(s) in place?
• Is the air handler disconnect closed?
• Has the circuit breaker tripped or the control board fuse burned
open?
• Are any manual reset switches open?
• Is the filter dirty or plugged?
• Is the LED on both control boards constantly ON? If not, refer
or
RED LED (AN2)
DIAGNOSTIC
OFF
Control Fault (No Power)
Flash
Blower Fault
ON
Normal Operation
Table 2. Air handler Control Board Fault Conditions
DIAGNOSTIC FAULT CONDITIONS
FOR VARIABLE SPEED FURNACES
GREEN
LED
RED
LED
Control Fault (No Power)
Off
Off
Normal Operation
On
On
Motor Fault
On
Flash
Communications Fault
Flash
Flash
Table 3. VSHE Motor Control Board Display Codes
UNIT MAINTENANCE
Proper maintenance is most important to achieve the best
performance from an air handler. Some of the components
and their locations are shown in
component of the air handler must be replaced, use only factory
authorized replacement parts specified in the Replacement Parts
List provided online.
WARNING:
ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow safety warnings exactly could
result in serious injury or property damage.
Improper servicing could result in dangerous
operation, serious injury, death or property
damage.
• Before servicing, disconnect all electrical power
to the indoor blower.
• When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
• Verify proper operation after servicing.
• These maintenance instructions are primarily intended to assist
qualified technicians experienced in the proper maintenance
and operation of this appliance.
• Always reinstall the doors on the air handler after servicing or
cleaning/changing the filters. Do not operate the air handler
without all doors and covers in place.
• To achieve the best performance and minimize equipment
failure, it is recommended that a yearly maintenance checkup
be performed. At a minimum, this check should include the
following items:
Air Filter(s)
- Inspect and replace the air filter at the beginning
of heating and cooling season. It is recommended that the filter
be cleaned or replaced every 4 to 6 months at a minimum. Newly
built or recently renovated homes may require more frequent
changing until the construction dust has minimized.
WARNING:
Never operate the air handler without a filter in
place. Dust and lint in the return air can build
up on internal components, resulting in loss of
efficiency, equipment damage, and possible fire.
Filters designed to remove smaller particles such as pollen, may
require additional maintenance.
Blower Compartment
- Dirt and lint can create excessive
loads on the motor resulting in higher than normal operating
temperatures and shortened service life. It is recommended
that the blower compartment be cleaned of dirt or lint that may
have accumulated in the compartment or on the blower and
motor as part of the annual inspection.
Blower Fan Wheel
- Inspect the blower wheel blades for
accumulations of dirt and clean if necessary. Inspect mounting
nut for tightness.
Summary of Contents for MB7EM 3-PHASE Series
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