Mitsubishi Electric MXZ-2C20NAHZ3 Installation Manual Download Page 2

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1 - 2 . S P E C I F I C A T I O N S

1 - 1 . T H E F O L L O W

I N G S H O U L D A L W A Y S B E O B S E R V E D F O R S A F E T Y

• Be sure to read “THE FOLLOWING SHOULD ALWAYS BE OBSERVED FOR SAFETY” before installing the air conditioner.

• Be sure to observe the arnings and cautions specified here as they include important items related to safety.

• After reading this manual, be sure to keep it together w ith the OPERATING INSTRUCTIONS for future reference.

R e q u i re d T o o l s fo r I n s t a l l a t i o n

Phillips scre driver

Level

Scale
Utility knife or scissors
Torque w rench
Wrench (or spanner)

5/32 in. (4 mm) hexagonal
w rench
Flare tool for R410A
Gauge manifold for R410A
Vacuum pump for R410A
Charge hose for R410A
Pipe cutter w ith reamer

ENGLISH

C O N T E N T S

1.  BEFORE INSTALLATION ............................................................ 1
2.  OUTDOOR UNIT INSTALLATION ............................................... 3
3.  FLARING WORK AND PIPE CONNECTION ............................... 5
4.  PURGING PROCEDURES, LEAK TEST, AND TEST RUN ......... 6
5.  PUMPING  DOWN ........................................................................ 7

Model

Pow er supply

Pipe length and height difference *1, *2, *3, *4, *5, *6, *8, *9

Rated Voltage

Frequency

Max. pipe length per indoor unit /

for multi-system

Max. height

difference

Max. no. of bends per indoor unit /

for multi system

Refrigerant

adjustment A *7

MXZ-2C20NAHZ3

208 / 230 V

60 Hz

82 ft. (25 m) / 164 ft. (50 m)

49 ft. (15 m)

25 / 50

1.08 oz each 5 ft.

(20 g/m)

MXZ-3C24NAHZ3
MXZ-3C30NAHZ3

82 ft. (25 m) / 230 ft. (70 m)

25 / 70

MXZ-5C42NA3

82 ft. (25 m) / 262 ft. (80 m)

25 / 80

*1 Never use pipes ith thic ness less than specified. The pressure resistance

ill be insufficient.

*2 Use a copper pipe or a copper-alloy seamless pipe.
*3 Be careful not to crush or bend the pipe during pipe bending.
*4 Refrigerant pipe bending radius must be 4 in. (100 mm) or more.

*5 Insulation material : Heat resisting foam plastic 0.045 specific gravity

*6 Be sure to use the insulation of specified thic ness. Excessive thic ness may

cause incorrect installation of the indoor unit and insufficient thic ness may

cause dew drippage.

*7 If pipe length exceeds 98 ft. (30 m), additional refrigerant (R410A) charge is

required. (No additional charge is required for pipe length less than 98 ft. (30 m).)

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D o n o t i n s t a l l t h e u n i t b y y o u rs e l f ( u s e r) .

Incomplete installation could cause fire or electric shoc , injury due to the unit

falling, or leakage of w ater. Consult the dealer from w hom you purchased the

unit or a qualified installer.

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F o l l o w t h e i n s t ru c t i o n s d e t a i l e d i n t h e i n s t a l l a t i o n m a n u a l .

Incomplete installation could cause fire or electric shoc , injury due to the unit

falling, or leakage of w ater.

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h e n i n s t a l l i n g t h e u n i t , u s e a p p ro p ri a t e p ro t e c t i v e e q u i p m e n t a n d t o o l s

fo r s a fe t y .

Failure to do so could cause injury.

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I n s t a l l t h e u n i t s e c u re l y i n a p l a c e t h a t c a n b e a r t h e w e i g h t o f t h e u n i t .

If the installation location cannot bear the w eight of the unit, the unit could fall
causing injury.

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P e rfo rm   e l e c t ri c a l   w o rk   a c c o rd i n g   t o   t h e   i n s t a l l a t i o n   m a n u a l   a n d   b e   s u re
t o   u s e   a n   e x c l u s i v e   c i rc u i t .   D o   n o t   c o n n e c t   o t h e r  e l e c t ri c a l   a p p l i a n c e s   t o
t h e   c i rc u i t .

If the capacity of the po er circuit is insufficient or there is incomplete electrical

or , it could result in a fire or an electric shoc .

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G ro u n d t h e u n i t c o rre c t l y .

Do not connect the ground w ire to a gas pipe, w ater pipe, lightning rod or

telephone ground. Defective grounding could cause electric shoc .

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D o n o t d a m a g e t h e w i re s .

Damaged ires could cause fire.

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B e s u re t o s h u t o ff t h e m a i n p o w e r w h e n s e t t i n g u p t h e i n d o o r P . C . b o a rd
o r w i ri n g .

Failure to do so could cause electric shock.

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Use the specified ires to securely connect the indoor and outdoor units.

Attach the ires firmly to avoid applying stress to the terminal bloc .

Improper connection could cause fire.

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Do not install the unit in a place here flammable gas may lea .

If gas leaks and accumulates around the unit, it could cause an explosion.

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D o n o t u s e i n t e rm e d i a t e c o n n e c t i o n o f t h e p o w e r c o rd o r t h e e x t e n s i o n

c o rd . D o n o t c o n n e c t m a n y d e v i c e s t o o n e A C o u t l e t .

It could cause a fire or an electric shoc .

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Use the parts provided or specified parts for the installation or .

The use of defective parts could cause an injury or lea age of ater due to a

fire, an electric shoc , the unit falling, etc.

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h e n p l u g g i n g t h e p o w e r s u p p l y p l u g i n t o t h e o u t l e t , m a k e s u re t h a t t h e re

i s n o d u s t , b l o c k a g e , o r l o o s e p a rt s b o t h i n t h e o u t l e t a n d o n t h e p l u g .
V e ri fy t h a t t h e p o w e r s u p p l y p l u g i s c o m p l e t e l y i n t h e o u t l e t .

If there is dust, blockage, or loose parts on the pow er supply plug or the outlet,

it could cause electric shoc or fire. If loose parts are found on the po er supply

plug, replace it.

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S e c u re l y a t t a c h t h e e l e c t ri c a l c o v e r t o t h e i n d o o r u n i t a n d t h e s e rv i c e
p a n e l t o t h e o u t d o o r u n i t .

If the electrical cover of the indoor unit and/or the service panel of the outdoor

unit are not attached securely, dust, w ater, etc. could collect in the unit and

could cause a fire or an electric shoc .

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W h e n i n s t a l l i n g , re l o c a t i n g , o r s e rv i c i n g t h e u n i t , m a k e s u re t h a t n o s u b s t a n c e

other than the specified refrigerant (R410A) enters the refrigerant circuit.

Any presence of foreign substance such as air can cause abnormal pressure
rise and may result in explosion or injury. The use of any refrigerant other than

that specified for the system ill cause mechanical failure, system malfunction,

or unit breakdow n. In the w orst case, this could lead to a serious impediment
to securing product safety.

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D o   n o t   d i s c h a rg e   t h e   re fri g e ra n t   i n t o   t h e   a t m o s p h e re .   C h e c k   t h a t   t h e
re fri g e ra n t   g a s   d o e s   n o t   l e a k   a ft e r  i n s t a l l a t i o n   h a s   b e e n   c o m p l e t e d .   I f
re fri g e ra n t   l e a k s   d u ri n g   i n s t a l l a t i o n ,   v e n t i l a t e   t h e   ro o m .

If refrigerant comes in contact ith a fire, harmful gas could be generated.

If refrigerant gas lea s indoors, and comes into contact ith the flame of a fan

heater, space heater, stove, etc., harmful gases ill be generated.

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U s e a p p ro p ri a t e t o o l s a n d p i p i n g m a t e ri a l s fo r i n s t a l l a t i o n .

The pressure of R410A is 1.6 times higher than R22. Not using the appropri-
ate tools and materials, or improper installation could cause the pipes to burst
causing an injury.

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h e n p u m p i n g d o w n t h e re fri g e ra n t , s t o p t h e c o m p re s s o r b e fo re d i s c o n -

n e c t i n g t h e re fri g e ra n t p i p e s .

If the refrigerant pipes are disconnected w hile the compressor is running and

the stop valve is open, air could be dra n in and the pressure in the refrigera

tion cycle could become abnormally high, causing the pipes to burst.

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h e n i n s t a l l i n g t h e u n i t , s e c u re l y c o n n e c t t h e re fri g e ra n t p i p e s b e fo re

s t a rt i n g t h e c o m p re s s o r.

If the compressor is started before the refrigerant pipes are connected and the

stop valve is open, air could be dra n in and the pressure in the refrigeration

cycle could become abnormally high, causing the pipes to burst.

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Fasten a flare nut ith a torque rench as specified in this manual.

If fastened too tight, a flare nut could brea and cause refrigerant lea age.

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I n s t a l l t h e u n i t a c c o rd i n g t o n a t i o n a l w i ri n g re g u l a t i o n s .

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B e s u re t o i n s t a l l a G ro u n d F a u l t I n t e rru p t ( G F I ) c i rc u i t b re a k e r.

Failure to install a Ground Fault Interrupt (GFI) circuit breaker may result in

electric shoc or fire.

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h e n o p e n i n g o r c l o s i n g t h e v a l v e b e l o w fre e zi n g t e m p e ra t u re s , re fri g -

e ra n t m a y s p u rt o u t fro m t h e g a p b e t w e e n t h e v a l v e s t e m a n d t h e v a l v e
b o d y , re s u l t i n g i n i n j u ri e s .

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P e rfo rm t h e d ra i n a g e / p i p i n g w o rk s e c u re l y a c c o rd i n g t o t h e i n s t a l l a t i o n

m a n u a l .

If there is defect in the drainage/piping w ork, w ater could drip from the unit,
and damage household items.

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Do not touch the air inlet or the aluminum fins of the outdoor unit.

This could cause injury.

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D o n o t i n s t a l l t h e o u t d o o r u n i t w h e re s m a l l a n i m a l s m a y l i v e .

If small animals enter the unit and damage its electrical parts, it could cause a

malfunction, smo e emission, or fire. eep the area around the unit clean.

CAUTION