Lennox MS7 Quick Manual
2011 Lennox Industries Inc.
Dallas, Texas, USA
506789−01
08/2011
MS7
Single−Zone
Mini−Split System
Air Conditioners
and Heat Pumps
This manual is the property of the homeowner
and must be left with the user.
Warnings
WARNING
ELECTRICAL SHOCK, FIRE, OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage.
Improper installation, adjustment, alteration, service or maintenance
can cause property damage, personal injury or loss of life. Installation
and service must be performed by a licensed professional installer (or
equivalent), or a service agency.
Any additions, changes, or conversions required in order for the appliance to satisfactorily meet the application needs must be made by a
licensed professional installer (or equivalent) using factory−specified
parts.
If you do not follow these instructions exactly, a fire or explosion may
result causing property damage, personal injury or death.
For your safety and to fulfill the terms of the limited warranty, a licensed
professional service technician (or equivalent) must annually inspect
this system.
This unit must be properly grounded.
Do not use this system if any part has been underwater. A flood−damaged appliance is extremely dangerous. Immediately call a licensed
professional service technician (or equivalent) to inspect the system
and to replace all controls and electrical parts that have been wet or to
replace the system, if deemed necessary.
Keep combustible materials at least 3 feet away from either the indoor
or outdoor unit.
Do not insert your hands, tools or any other item into the air intake or
air outlet at either the indoor or outdoor unit.
If outdoor unit is installed on a raised stand, check condition of stand
occasionally to ensure that it remains stable.
DO NOT spray water on the indoor unit for any reason.
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Parts Arrangement
Indoor unit
Filter
Cooling Power/Run
(Typical indoor unit shown. Actual unit may be slightly different.)
Front Panel
Directional Louver
Indoor Unit Display
Air inlet
Display
Wrapping Tape
Wall Pipe
Air outlet
Wireless remote control
Receiver
Heating
Temperature
(or error code)
Outdoor unit
Dehumidification
Setting
Air in
epipnoitcennoC
Drainage hose
Air out
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Important Operating Instructions
To ensure comfort, make sure that temperature selection has been
properly set at the 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 louver is properly adjusted.
IMPORTANT
System Operation
Cooling Operation
In the cooling mode, the indoor coil absorbs the
heat from the room and transfers it to the outdoor
coil where it is discharged. The system cooling
capacity is affected by the outdoor ambient temperature. The indoor fan operates continuously in
the COOL mode. The indoor unit directional louver is fixed in an upward position.
If the unit is in the cooling mode, frost will form on
the indoor coil when the outdoor ambient temperature reaches approximately 32°F (0°C). Typically, when the outdoor ambient temperature falls
below 32°F (0°C), the indoor unit control locks out
operation to protect the system.
In cooling mode, the operating range of the outdoor unit is typically from 41°F (5°C) to 115°F
(46°C).
Heating Operation
The refrigerant flow is reversed during the heating
cycle. In this case, the outdoor coil absorbs the
heat from outside and transfers it to the indoor coil
where it is discharged into the room. The system
heating capacity is also limited by the available
heat in the outdoor ambient air.
In the HEAT mode, the indoor fan will remain OFF
for two minutes in the following instances:
at the beginning of each heating cycle,
after a defrost cycle has ended,
In the heating mode, the indoor blower will contin-
ue to operate for 60 seconds after the outdoor unit
has shut off. The indoor unit directional louver is
fixed in a downward position.
In climates with very low winter temperatures, it
may be necessary to supplement heating by additional means (space heater, fireplace, etc.).
AUTO Mode Operation
When the system is set to operate in AUTO mode,
the indoor and outdoor units work together to
meet a series of preset demands. The remote
control temperature setpoint and fan operation
functions are not adjustable in the AUTO mode.
In AUTO mode, if the indoor ambient temperature
is greater than 77°F (25°C), the unit will operate
in the cooling mode. The outdoor unit will run until
the indoor ambient temperature reaches 75°F
(24°C). At this point, the outdoor unit compressor
and outdoor fan will operate for another 60 seconds, then they will both turn off. The indoor fan
will run continuously at a speed determined by the
indoor ambient temperature. During AUTO cooling operation, the indoor unit directional louver is
fixed in an upward position.
Heat Pump Systems Only −− In AUTO mode, if the
indoor ambient temperature is less than 68°F
(20°C), the unit will run in heating mode. The outdoor unit will run until the indoor ambient temperature reaches 69°F (21°C). At this point, the outdoor unit compressor and fan will operate for
another 60 seconds, then they will both turn off.
The indoor fan will run continuously at a speed
determined by the indoor ambient temperature.
During AUTO heating operation, the indoor unit
directional louver is fixed in a downward position.
FAN Mode Operation
When the system is set to operate in FAN mode,
the indoor fan runs continuously in AUTO, low,
medium or high speed. The outdoor unit is off. In
AUTO fan mode, the fan speed is determined by
the indoor ambient air temperature.
DEHUMIDIFICATION Mode Operation
In heating mode, the operating range of the outdoor unit is typically from 05°F (−15°C) to 86°F
(30°C).
When the system is set to operate in DEHUMIDIFICATION mode, the indoor fan runs continuously in low speed.
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