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2020 Lennox Industries Inc.
©
Dallas, Texas, USA
MCFA and MCFB Ceiling
or Floor-Mounted
Convertible
MMDA and MMDB Medium Static
Ducted
MWMA, MWMB and 3WMB Wall-
Mounted
M22A, M33A and M33B Cassette
THIS MANUAL MUST BE LEFT WITH THE
OWNER FOR FUTURE REFERENCE
USER GUIDE
MCFA, MCFB, MMDA,
MMDB, MWMA, MWMB,
MINI-SPLIT SYSTEM INDOOR UNITS
507550-04
5/2020
Supersedes 8/2018
WARNING
Improper installation, adjustment, alteration, ser vice or
maintenance can cause property damage, personal
injury or loss of life.
Installation and service must be performed by a li censed
professional HVAC installer (or equivalent) or a service
agency.
WARNING
ELECTRICAL
SHOCK,
HAZARD.
DO NOT spray water on the indoor unit for any reason.
Do not touch the unit or the controller if your hands are
wet.
Do not insert your hands, tools or any other item into the
air intake or air outlet at either the indoor or outdoor unit.
Do not remove the outdoor unit fan guard for any reason.
CAUTION
If outdoor unit is installed on a raised stand, check
condition of stand occasionally to ensure that it remains
stable.
Do NOT install sprinklers or soaker hoses where they
can expose the outdoor unit to treated water. Prolonged
exposure to treated water will corrode the surface
of the steel and aluminum parts and will diminish the
performance of the unit.
IMPORTANT
System operation is controlled by either a wired or
wireless remote control. Refer to the manual provided
with the control for system operation.
To ensure comfort, make sure that temperature selection
has been properly set at the unit controller or wireless
remote control.
To ensure efficient operation, do not block air intake or
outlet at either the indoor or outdoor unit.
Do not stand on outdoor unit or store items on top of
unit.
Make sure that indoor unit directional louvers are
properly adjusted.
3WMB, M22A,
M33A and M33B
FIRE,
OR
EXPLOSION
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Table of Contents
Related Manuals for Lennox MCFA
Summary of Contents for Lennox MCFA
- Page 1 Dallas, Texas, USA 3WMB, M22A, M33A and M33B MINI-SPLIT SYSTEM INDOOR UNITS 507550-04 5/2020 Supersedes 8/2018 MCFA and MCFB Ceiling WARNING or Floor-Mounted Convertible Improper installation, adjustment, alteration, ser vice or maintenance can cause property damage, personal injury or loss of life.
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Page 2: Parts Arrangement
Parts Arrangement MCFA or MCFB M22A, M33A or M33B Cassette Ceiling- or Floor-Mounted Non-Ducted Unit Cassette may be adjusted to provide discharge air from one, two, three or four sides. DISCHARGE AIR LOUVER DIFFUSER LOUVER ADJUSTMENT LEVER RETURN AIR GRILLE... -
Page 3: Maintenance
Figure 4. Wall Mounted Units Cooling operation Adjust louvers outward. Maintenance Figure 2. Ceiling Mount Cassettes WARNING MCFA or MCFB Ceiling- or Floor-Mounted Units Use the wired or wireless remote control to set the position ELECTRICAL SHOCK, FIRE, EXPLOSION of the discharge air louvers. The louvers may be set to HAZARD. -
Page 4: Filter Cleaning
Filters are accessed through the re turn air grille as shown Preparing Unit for Prolonged Idle Periods in the illustration which fol lows. The unit must be prepared before lengthy periods of inactivity: Typical Filter Removal • Set the controller so the indoor unit operates in the fan only mode for 8 to 12 hours. -
Page 5: Troubleshooting
generated by the defrost process becomes steam and Troubleshooting may be seen as it is blown out of the indoor unit. IMPORTANT Sounds can be heard near the indoor unit During certain parts of the heating or cooling pro cess, If any of the following conditions exist, immediately low swishing or groaning sounds may be heard near the turn the system (indoor and outdoor units) off at the... - Page 6 Table 1. Troubleshooting Symptom Possible Cause Possible Solution • Power failure • Wait for power to be restored • Power to unit is OFF or disconnected • Turn on or reconnect power to the unit • Circuit breaker may be tripped or fuse may be Unit does not start.
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Page 7: Error Codes
Error Codes Table 3. MCFA, MCFB, MMDA, MMDB, M22A M33A and M33B Troubleshooting Codes Indoor units are equipped with either a small panel Display Description with four LEDs that flash to indicate system errors or a Indoor unit EEPROM error digital display that provides an error code.