Mitsubishi Electric MXZ-4C36NAHZ Operating manual

TECHNICAL & SERVICE MANUAL
CONTENTS
TECHNICAL CHANGES......................................... 2
1. SAFETY PRECAUTION....................................3
2. OVERVIEW OF UNITS......................................6
3. SPECIFICATIONS............................................10
4. DATA................................................................ 14
5. OUTLINES AND DIMENSIONS...................... 36
6. WIRING DIAGRAM......................................... 40
7.
NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION.... 47
8. TROUBLESHOOTING.................................... 52
9.
PRECAUTIONS AGAINST REFRIGERANT LEAKAGE
....141
10. DISASSEMBLY PROCEDURE......................142
No. OCH573
REVISED EDITION-E
MXZ-4C36NAHZ MXZ-4C36NAHZ-U1
MXZ-5C42NAHZ MXZ-5C42NAHZ-U1
MXZ-8C48NAHZ MXZ-8C48NAHZ-U1
MXZ-8C48NA MXZ-8C48NA-U1
MXZ-8C60NA-U1
PAC-MKA50BC
PAC-MKA30BC
PAC-MKA51BC
PAC-MKA31BC
HFC
utilized
R410A
Februray 2018
Notes:
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[Model Name]
<Outdoor unit>
MXZ-4C36NAHZ
MXZ-5C42NAHZ
MXZ-8C48NAHZ
MXZ-8C48NA
MXZ-8C60NA
<Branch box>
PAC-MKA50BC
PAC-MKA30BC
PAC-MKA51BC
PAC-MKA31BC
PARTS CATALOG (OCB573)
[Service Ref.]
OUTDOOR UNIT: MXZ-4C36NAHZ
BRANCH BOX: PAC-MKA51BC
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TECHNICAL CHANGES
MXZ-4C36NAHZ MXZ-4C36NAHZ-U1
MXZ-5C42NAHZ MXZ-5C42NAHZ-U1
MXZ-8C48NAHZ MXZ-8C48NAHZ-U1
MXZ-8C48NA MXZ-8C48NA-U1
Service ref. have been changed as follows.
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OCH573E

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Cautions for units utilizing refrigerant R410A
1-1. ALWAYS OBSERVE FOR SAFETY
Use new refrigerant pipes.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22, etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil, etc.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil, etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil, etc.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil, etc.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused
by failure to follow the instructions.
Use the specified refrigerant only.
Store the piping indoors, and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of compressor.
1-2. CAUTIONS RELATED TO NEW REFRIGERANT
Before obtaining access to terminal, all supply
circuit must be disconnected.
1 SAFETY PRECAUTION
OCH573E

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Unit
Electronic weighing scale
[3] Service tools
(1) Use the below service tools as exclusive tools for R410A refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
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[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.
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OCH573E

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1-3. Cautions for refrigerant piping work
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37RROVIRU5$7KHIROORZLQJWDEOHVKRZVZKHWKHUFRQYHQWLRQDOWRROVFDQEHXVHGRUQRW
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
1/32 [0.8]
1/32 [0.8]
1/32 [0.8]
5/128 [1.0]
—
1/32 [0.8]
1/32 [0.8]
1/32 [0.8]
5/128 [1.0]
5/128 [1.0]
Nominal
dimensions
(in)
Diagram below: Piping diameter and thickness
Outside
diameter (mm)
Thickness : in [mm]
R410A R22
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
11/32-23/64 [ 9.1]
1/2-33/64 [13.2]
41/64-21/32 [16.6]
49/64-25/32 [19.7]
—
9.0
13.0
16.2
19.4
23.3
Nominal
dimensions (in)
Flare cutting dimensions
Outside
diameter (mm)
Dimension A ( )
+0
-0.4
Unit : in [mm]
R410A R22
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
43/64 [17.0]
7/8 [22.0]
1-3/64 [26.0]
1-9/64 [29.0]
17.0
22.0
24.0
27.0
36.0
Nominal
dimensions (in)
Flare nut dimensions
Outside
diameter (mm)
Dimension B
Unit: in [mm]
R410A R22
—
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Applied oil
Safety charger
Charge valve
Vacuum pump
Flare tool
Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale
Vacuum gauge or thermis-
tor vacuum gauge and
vacuum valve
Charging cylinder
Air purge, refrigerant charge
and operation check
Gas leak check
Refrigerant recovery
Refrigerant charge
Apply to flared section
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Prevent gas from blowing out
when detaching charge hose
Vacuum drying and air
purge
Flaring work of piping
Bend the pipes
Cut the pipes
Weld the pipes
Refrigerant charge
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refri-
gerant to thermistor vacuum gauge)
Refrigerant charge
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil, ether oil and
alkylbenzene oil (minimum amount)
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adop-
ter for reverse flow check
Tools for other refrigerants
can be used by adjusting
flaring dimension
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
Tools and materials Use R410A tools Can R22 tools be used?
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
Can R407C tools be used?
Ester oil, ether oil:
Alkylbenzene oil: minimum amount
(Usable if equipped
with adopter for rever-
se flow)
(Usable by adjusting
flaring dimension)
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
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OCH573E


2 OVERVIEW OF UNITS
2-1. CONSTRUCTION OF SYSTEM
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OCH573E

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Indoor unit (Ceiling concealed type)
Indoor unit
(Wall mounted type)
Outdoor unit Branch box
2-2. SYSTEM OUTLINE
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2-2-1. System example
2-2-2. Method for identifying
Ŷ2XWGRRUXQLW
Development No. : A, B, ···,etc.
Power supply
N: Single phase 208/230 V 60Hz
Multi type heat pump
inverter outdoor unit
Indicates equivalent to rated cooling capacity.
(kBTU/h)
Number of connectable indoor units (MAX.)
Control and refrigerant
A : New A control and R410A
Model type
M X Z-4 88C NA
P A C-MK A5 1 B C
HZ-U1
Sub-number
(Indispensable)
Optional parts
Model type
Branch box (Controller)
Number of branches
5 : 5 branches
3 : 3 branches
Marketable area
A: America, Canada
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OCH573E

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2-3. TYPICAL COMBINATION EXAMPLE
Branch box is located INSIDE of condominium
Branch box
(Inside)
Installing branch box indoors
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Branch box (5-branches type)
Outdoor unit
SEZ-18 MSZ-12 MSZ-12 MSZ-09 MSZ-09
Living Dining Bedroom (1) Bedroom (2)
Master
bedroom
Indoor unit type (capacity class)
Rated capacity (cooling) (kBTU/h)
06
6
09
9
12
12
15
15
24
24
18
18
30
30
36
36
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Example:
Total rated capacity
60 62.4 kBTU/h
MSZ-09 = 9
+
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SEZ-18 = 18
MSZ-12 = 12
MSZ-12 = 12
MSZ-09 = 9
OCH573E

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2-4. SIMPLIFIED PIPING SYSTEM
Piping connection size
Liquid
Gas
{3/8 inch
[9.52 mm]
{5/8 inch
[15.88 mm]
The piping connection size differs according to the type and capacity of indoor units.
Match the piping connection size of branch box with indoor unit.
If the piping connection size of branch box does not match the piping connection size of
indoor unit, use optional different-diameter (deformed) joints to the branch box side.
(Connect deformed joint directly to the branch box side.)
AB
{3/4 inch*
[19.05 mm]
* MXZ-8C60NA only
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A
BB B BB
Branch box
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2 branches pipe (joint)
: optional parts
Branch box #1
Branch box #2
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3 SPECIFICATIONS
3-1. OUTDOOR UNIT :
MXZ-4C36/5C42/8C48NAHZ(-U1), MXZ-8C48NA(-U1), MXZ-8C60NA-U1
Conversion formula:
kcal/h = kW o860
BTU/h = kW o3412
CFM = m3/min o35.31
Service Ref. MXZ-4C36NAHZ(-U1) MXZ-5C42NAHZ(-U1)
Standard performance
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