This section will help answer
some of the questions we are asked most often.
Q. How big is the new M-Series indoor
A. Mr. Slim's indoor unit is compact and mounts discreetly high on
wall where it is mostly out of view.
Q. How big is the new M-series outdoor
A. Mr. Slim's outdoor unit is not bulky like the conventional
style units you are used to seeing. The unit's very thin profile
allows it to be mounted discreetly along the back or side of the
home. Because the height is minimal, a small planting of shrubbery
will also keep it from plain view for a more pleasing appeal.
Please refer to table below for actual dimensions.
Q. How quiet is Mr. Slim?
A. Mr. Slim is designed to be quieter and more efficient than old
window units, so you'll sleep easier with less worry about
operating costs. The unit's fan is designed to deliver air quietly
with only a gentle whoosh. (That's why Mr. Slim is the first
choice for thousands of churches, schools, and libraries.)
Q. How does Mr. Slim work?
A. Mr. Slim employs the same mechanical components as any basic
air-conditioning system whose interactions cause the process of
evaporation to occur. Mr. Slim is a split-ductless design, which
simply means the indoor unit is separated from the outdoor unit and
is connected by a gas and a liquid refrigerant line. The outdoor
unit is considered the hot-side during the air-conditioning
process. The cold-side unit is located indoors. In the heating
process the compressor reverses this operation, and the heat energy
is evaporated in the outdoor unit. Then the indoor unit
collects this heat energy while a fan blows air over the indoor
coil and distributes the warm air into the room.
Q. What are the installation considerations for mounting
the Mr. Slim M-Series indoor and outdoor units?
A. The indoor unit is typically installed high on an exterior
wall. An exterior wall allows for easy connections between the
indoor and outdoor units. The indoor unit is suspended on a wall
bracket that is first mounted and secured to the wall. Because the
indoor unit is so light, there is not significant pressure placed
on the wall. The indoor unit is mounted horizontally and must be
leveled. For the best circulation and air distribution the unit
should be at least seven feet high or six inches below an
The outdoor unit should be mounted in a convenient location to
allow for easy connection to the indoor unit. However, you can
place the outdoor unit up to 49 feet away from the indoor unit if
you wish. The outdoor unit can be placed close to the wall but must
have at least a foot away. The outdoor unit should be mounted on a
concrete pad to assure level footing. The fan outlet should be
facing away from the home or the unit can be mounted perpendicular
to the wall.
Q. What color is the M-Series indoor unit?
A. The units are white with varying degrees of brightness across
the product line.
Q. Why do you need a three-inch opening in the wall to
install Mr. Slim?
A. Unlike window units or hotel style units, which require a
large wall or window opening to be cut, Mr. Slim only requires a
three-inch round opening. This opening in the wall is necessary to
allow the refrigerant lines and the wiring to connect the indoor
unit to the outdoor unit. This opening is sealed and insulated by
your installing contractor so no drafty air leaks or water from
outside get in.
Q. What is the I FEEL mode on the M-Series remote
A. This answer applies to all newer M-Series equipment. This
function samples the indoor temperature for 2 minutes and then
based on that temperature chooses the mode the unit will operate
in. If the temperature in the room is more than 79 degrees it will
be set in the Cool mode at 75 degrees. If the room temperature is
77 to 79 it will be set to the Cool mode minus 4 degrees of the
current room temperature. If the temperature sensed is 73 to 77
degrees then the unit will be set in the Dry mode minus 4 degrees
of the current room temperature. If the room temperature is less
than 73 degrees then the unit will be set in the Heat mode. In the
"I Feel" mode the temperature display disappears and pressing the
"Too Warm" or "Too Cool" button will change the set point by 2-4
Q. Why should I consider buying Mr. Slim?
Mitsubishi Electric is the industry leader in ductless air
conditioning technology. Our innovations have defined cutting edge
technology for years. Compare and you'll see no one surpasses Mr.
Slim's performance for quiet, easy-to-use energy efficient
operation. And since our ductless technology carries the Mitsubishi
Electric name, you know every unit is built to last. The bottom
line is that Mr. Slim delivers the ultimate control of comfort for
your home or office. It's true today and will be comfortably
self-evident for years to come.
Mr. Slim provides all of these important
- Quiet and efficient operation: Mr. Slim runs at as little as 26
dB(A). This means that you can hold a quiet conversation or sleep
without having to worry about the air conditioner interrupting
- No ductwork is required: You will not have to tear up walls or
add expensive ductwork to basement remodels
- Will not take up a window: If you take as much pride in
your landscape as you do your home, you will appreciate that you
can enjoy your handy work from the inside now that you have gotten
your window view back. If you own a window unit then you are also
concerned with the security issue of someone taking it out and
coming inside your home. Mr. Slim eliminates this concern.
- Effective zone cooling and heating: True zoning means that you
can tailor individual rooms to your personal comfort tastes.
Perhaps you prefer it cooler in the bedroom or kitchen. Also if do
not use your guestrooms, dining room, or bonus room regularly, why
cool them day-in, day-out?
- Versatility: You can air condition spaces you at first thought
impossible because there is no space for ductwork and you don't
want a window unit. Both at the home or office, Mr. Slim is
flexible enough to work in almost any room environment.
- Remote controlled operation and timer functions: With Mr. Slim,
you can control your comfort from across the room. The M-series
comes with a wireless remote controller that gives you control of
temperature, fan speed, vane operation and more. Plus a timer
function means that you can set Mr. Slim to operate when you need
it to. For example, if you know you arrive home from the office
around 6:00 PM, you can set Mr. Slim to turn on at 5:00PM to begin
cooling before you get there. This means that you are not cooling
or heating your home while you're not there, which saves you
Q. PURY-100/80TMU related: What type of communications
is used with the City Multi systems?
A. City Multi uses a 24 to 30 volts D.C. digital communication
called Mitsubishi Network (M-net). This network voltage is
generated from the outdoor unit to the B.C. controller and all the
indoor units. This allows for constant communication between all
components in the system that operate via the M-net.
Q. PURY-100/80TMU related: Do you require a special
control wiring type for the M-Net?
Yes. It must be a #16 or #18 gauge, two conductor, stranded and
Q. PURY-100/80TMU related: Do you need
to ground the shielded cable?
Yes. However it will only go to earth ground at the outdoor
unit, no where else.
Q. PURY-100/80TMU related: What is the best way to wire
in a safety circuit for a condensate pump?
For the PLFY, (ceiling mount), series there is a condensate pump
already installed and the safety is factory wired. For the PDFY,
(ducted model), and PKFY, (wall mount), *(with the exception of the
PKFY-08NAMU-A)*, series there is a red jumper located on the
circuit board at CN31. You simply cut the red jumper wire and
attach your pump safety wires to the two new red wires just
created. For the PKFY-08NAMU-A it is recommended that you break
your main 115-volt feed to the indoor unit through the safety
circuit for the pump. For CMB, (B.C. controller), series it is the
same as above however it is a red jumper located at CN13 that must
Q. PURY-100/80TMU related: When using a Simple MA
controller can I change the operation mode?
No, you can only turn the unit on and off, adjust the
temperature, and change the fan speed.