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YORK CASSETTE (EN) 035T76015-000

CASSETTE

9

REFRIGERANT PIPING WORK

Refrigerant  piping is import in particular.
Refrigeration cycle of the split air conditioner is realized by the perfect piping work.

Piping length and elevation

If the piping is too long, both the capacity and reliability of unit will drop. As the number of bends increase, resistance
to flow of refrigerant system increase, thus lowering cooling capacity and as a result the compressor may become
defective. Always choose the shortest path and follow the recommendation as tabulated below.

Piping Connection

Do not use contaminated or damaged copper tubing. If any piping, evaporator or condenser had been exposed or
had been opened for 15 seconds or more, than vacuum and purge with field supplied refrigerant. Generally, do not
remove plastic, rubber plugs and brass nuts from the valves, fitting, tubing and coils units it is ready to connect
suction or liquid line into valves or fittings.

If any brazing work is required, ensure that nitrogen gas is passed through coil and joints while the brazing work is
being done. This will eliminate soot formation on the inside wall of copper tubing.

Cut the pipe stages by stages, advancing the blade of pipe cutter slowly. Extra force and a deep cut will cause more
distortion of pipe and therefore extra burr.

Remove burrs from cut edges of pipes with a remover. This will avoid unevenness on the flare face which will cause
gas leak.

Align the center of the piping and sufficiently tighten the flare nut with fingers. Finally, tighten the flare nut with
torque wrench until the wrench clicks.

Be sure to execute heat insulation. (polyurethane form with thickness more than 15 mm)

Except the outdoor until which is pre-charge with refrigerant R407C, the indoor unit and the refrigerant connection
pipes must be purged because the air that contain moisture remaining in the refrigerant cycle may cause malfunction
to the compressor.

MODEL

INDOOR

MKL-MKM 25

MKL-MKM 35

MKL-MKM 45

MKL-MKM 55

OUTDOOR

MOL-MOM 25

MOL-MOM 35

MOL-MOM 45

MOL-MOM 55

Max. length (m)

15 m

20 m

20 m

20 m

Max. elevation (m)

8 m

10 m

10 m

10 m

Max. no. of bends

10

10

10

10

Liquid pipe size

3/8"

3/8"

3/8"

3/8"

Gas pipe size

5/8"

5/8"

3/4"

3/4"

02_MKL-MKM.p65

13/6/02, 11:08 am

9

Summary of Contents for MKL/MKM 25

Page 1: ...YORK CASSETTE EN 035T76012 000 035T76015 000 MINISPLIT CASSETTE MODELS MKL MKM G MOL MOM 25 55 TECHNICAL GUIDE 01_MKL MKM p65 13 6 02 2 01 pm 1...

Page 2: ...undertaking any work on the unit make sure that the power supply has been disconnected ELECTRICAL CONNECTIONS All electrical wiring and connections must comply with local standards Power supply cord a...

Page 3: ...250 47 650 6 23 8 00 13 98 13 95 5 367 6 892 12 038 12 007 20 130 26 986 42 350 45 635 5 89 7 901 12 4 13 36 5 072 6 800 10 672 11 499 220 240 1 50 1 184 1 358 1 637 1 740 0 15 0 207 0 207 0 259 0 4...

Page 4: ...800 800 800 Clearance required for outdoor units Overall unit dimensions are shown in the Technical Specifications table B A D C I H F E G C B A W D H F E A B W H D F C E MODELS A B C D E F G H I MKL...

Page 5: ...or wiring piping and drainage The indoor unit must be installed in such that is free from any obstacles in path of cool air discharge and warm air return and must allow spreading of air throughout the...

Page 6: ...e sure to discuss the ceiling drilling work with the installers concerned Unit Hanging Confirm the pitch of the hanging rod is 525 0 mm x 786 0 mm sharp Hold the unit and hang it on the hanging rod wi...

Page 7: ...mm on the drain piping to avoid the condensed water dripping inside the room Drain Test Connect the main drain pipe to the flexible drain hose Feed water from flexible drain hose to check the piping f...

Page 8: ...the service valve 2 Connect the line to a vacuum pump and pump down to 5 Pa 3 When pump down is finished wait 15 minutes to detect potential circuit leakage Open service valves on the outdoor unit Tab...

Page 9: ...ed through coil and joints while the brazing work is being done This will eliminate soot formation on the inside wall of copper tubing Cut the pipe stages by stages advancing the blade of pipe cutter...

Page 10: ...tightened plug the access holes with the rubber plugs provided The outer end of the rubber plugs is inclined and should be installed flush with the slope Turn the plugs to suit their location and pre...

Page 11: ...stall the air intake grille together with the air filter to the front panel The grille can be fit in any direction when selecting direction the ceiling design and grille operability should be consider...

Page 12: ...de a return grille 2 Air flow rate should be approximately 25 against the nominal air flow rate In this case the external static pressure of duct side is 1 1 5 mm Aq Therefore the external static pres...

Page 13: ...sealing material is the same length as the longer air discharge outlet If it is desired to seal the shorter air discharge outlet cut the scaling material to shorten it push the sealing material in abo...

Page 14: ...til the coil temperature reaches predetermined set points at which time the unit will resume normal operation LOW VOLTAGE The feature is used to protect against any damage to the unit caused by fluctu...

Page 15: ...t or stop button must be pressed again to reset the timer function To cancel either the Start or Stop Timer setting press the Cancel button To check the time that has been entered either for starting...

Page 16: ...at the units is held off due to Low Voltage If the voltage has passed through the reset voltage and the unit is waiting for the time delay the lights will go to normal operation 3 The lights will show...

Page 17: ...warm water 40 C with a mild detergent 2 Rinse and dry before replacing on unit 3 Never use petrol alcohol or any oter chemical product 1 Remove dust from the front panel with a soft duster or wipe a d...

Page 18: ...03_MKL MKM p65 13 6 02 11 08 am 18...

Page 19: ...03_MKL MKM p65 13 6 02 11 08 am 19...

Page 20: ...may then be re used if appropriate or returned to the manufacturer for disposal Under No circumstances should refrigerant be vented to atmosphere Where appropriate drain the refrigerant oil from each...

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