Mitsubishi Electric Mr.Slim PKH36FK3 Technical & Service Manual Download Page 3

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4. ADVANCED MICROPROCESSOR

(1) Easy to Use Microprocessor

1) Ultra-Thin Remote Controller

The streamlined, wide controller is designed to
blend with any kind of interior and the adoption of
a sophisticated microprocessor allows you to
carry out a wide range of operations easily.

2) Attractive Liquid Crystal Display (LCD)

Units operation mode, set temperature, room tem-
perature, timer setting, fan speed,
and air flow direction are displayed on the
remote controller with the easily understood visual
Liquid Crystal Display (LCD).

3) Convenient 24-Hour ON-OFF Timer

The timer allows Mr.SLIM to be switched on or
off automatically at the time is shown on the LCD.

4) Self-Diagnostic Feature Indicates Instantly

In the rare case when a problem occurs, the unit stops operating and the set temperature indicator changes to the
self-diagnostic indicator, indicating the location of the fault.
If the check switch is pressed twice, the unit stops operating and the check mode is initiated. The cause of the most
recent problem stored in the memory is displayed on the LCD. This is extremely useful for maintenance purposes.

5) Useful Memory Feature for Storing Instructions

The previous set value is memorised so that constant temperature control can be obtained. This is convenient when,
for example, a power failure occurs.

(2) Non-polar Two-Wire Remote Controller Cables

The non-polar, two-wire type remote controller cable is slim, installation is simple and trouble-free. Remote controller
wire can be extended up to 550 yards.

(3) Automatic Cooling / Heating Changeover Operation

An automatic cooling and heating changeover operation system is provided to ensure easy control and year-round air
conditioning.
Once the desired temperature is set, unit operation is switched automatically between cooling and heating, in
accordance with the room temperatures as low as 75

5. READY-CHARGED REFRIGERANT SYSTEM

PRE-CHARGE REFRIGERANT REQUIRED FOR LINE LENGTH OF 100ft AT
SHIPMENT. PREVENTING TROUBLES DUE TO SHORTAGE OF REFRIGERANT.

The unique refrigerant circuit and a large accumulator always controls the refrigerant to its optimum condition regardless of
the length of 164ft maximum. The additional refrigerant charging work at the field which often caused uncertain problems
heretofore is completely eliminated. This unique system serves to improve the quality of work and reliability, and also helps
to speed up the installation work.

With normal circulation systems, a high-pressure refrigerant, condensed for cooling by the outdoor heat exchanger, is
reduced in pressure by capillary tubes in the indoor unit after passing through the restrictor valve in the outdoor unit (see
Figure 1). With the new circulation system, the direction of the restrictor valve is reversed as shown in Figure 2, and the
condensed high pressure refrigerant is reduced in pressure by the capillary tubes in the outdoor unit. This results in a “two-
phase refrigerant” of reduced pressure in the liquid section of the piping. The density of this two-phase refrigerant is 1/3~
1/2 of that of the high pressure liquid refrigerant, and thus is required in smaller amounts (see Figures 1 and 2). As a result,
the length of the piping can be extended further, and the effects of height differences are reduced. These new circulation
system are also equipped with a large accumulator which allows the refrigerant required for the 100ft piping length to be
enclosed in the outdoor unit. The result is an air conditioner that requires no charging unless piping is extended beyond
100ft.

Indoor unit

Outdoor unit

Indoor
heat
exchanger

4•way
valve

Accumulator

Compressor

Outdoor
heat
exchanger

Capillary tubes
for heating

Capillary
tubes for
cooling

Liquid section
of piping

High-pressure
liquid
refrigerant

Restrictor