Mitsubishi Electric MXZ-4C36NAHZ User manual

TECHNICAL & SERVICE MANUAL
CONTENTS
1. SAFETY PRECAUTION....................................2
2. OVERVIEW OF UNITS......................................5
3. SPECIFICATIONS.............................................9
4. DATA................................................................ 12
5. OUTLINES AND DIMENSIONS...................... 23
6. WIRING DIAGRAM......................................... 25
7. NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION.... 28
8. TROUBLESHOOTING.................................... 32
9. PRECAUTIONS AGAINST REFRIGERANT LEAKAGE
....132
10. DISASSEMBLY PROCEDURE......................133
No. OCH573
MXZ-4C36NAHZ
MXZ-5C42NAHZ
MXZ-8C48NAHZ
MXZ-8C48NA
PAC-MKA50BC
PAC-MKA30BC
HFC
utilized
R410A
August 2014
Notes:
• This service manual
describes technical data of
outdoor unit and branch box.
As for indoor units, refer to
its service manual.
• RoHS compliant products
have <G> mark on the spec
name plate.
[Model Name]
<Outdoor unit>
MXZ-4C36NAHZ
MXZ-5C42NAHZ
MXZ-8C48NAHZ
MXZ-8C48NA
<Branch box>
PAC-MKA50BC
PAC-MKA30BC
(Indispensable optional parts for MXZ-4C36/5C42/8C48NAHZ and MXZ-8C48NA)
PARTS CATALOG (OCB573)
[Service Ref.]
OUTDOOR UNIT: MXZ-4C36NAHZ
BRANCH BOX: PAC-MKA50BC
Model name
indication
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

2
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 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.
1SAFETY PRECAUTION
OCH573

3
Gravimeter
Unit
[3] Service tools
(1) Use the below service tools as exclusive tools for R410A refrigerant.
No. Tool name Specifications
1 Gauge manifold ·Only for R410A
·Use the existing fitting specifications. (UNF1/2)
·Use high-tension side pressure of 5.3MPa·G or over.
2 Charge hose ·Only for R410A
·Use pressure performance of 5.09MPa·G or over.
3 Electronic scale
4 Gas leak detector ·Use the detector for R134a, R407C or R410A.
5 Adaptor for reverse flow check ·Attach on vacuum pump.
6 Refrigerant charge base
7 Refrigerant cylinder ·Only for R410A ·Top of cylinder (Pink)
·Cylinder with syphon
8 Refrigerant recovery equipment
[2] Additional refrigerant charge
When charging directly from cylinder
· Check that cylinder for R410A on the market is a syphon type.
· Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
[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) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
OCH573

4
1-3. Cautions for refrigerant piping work
New refrigerant R410A is adopted for replacement inverter series. Although the refrigerant piping work for R410A is
same as for R22, exclusive tools are necessary so as not to mix with different kind of refrigerant. Furthermore as the
working pressure of R410A is 1.6 times higher than that of R22, their sizes of flared sections and flare nuts are different.
1 Thickness of pipes
Because the working pressure of R410A is higher compared to R22, be sure to use refrigerant piping with thickness
shown below. (Never use pipes of 7/256 in [0.7 mm] or below.)
2 Dimensions of flare cutting and flare nut
The component molecules in HFC refrigerant are smaller compared to conventional refrigerants. In addition to that,
R410A is a refrigerant, which has higher risk of leakage because its working pressure is higher than that of other
refrigerants. Therefore, to enhance airtightness and intensity, flare cutting dimension of copper pipe for R410A has
been specified separately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for
R410A also has partly been changed to increase intensity as shown below. Set copper pipe correctly referring to cop-
per pipe flaring dimensions for R410A below. For 1/2 and 5/8 inch, the dimension B changes.
Use torque wrench corresponding to each dimension.
3 Tools for R410A (The following table shows whether conventional tools can be used or not.)
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.
Dimension A
Dimension B
OCH573

5
2OVERVIEW OF UNITS
2-1. CONSTRUCTION OF SYSTEM
MXZ-5C42NAHZ MXZ-8C48NAHZ
MXZ-8C48NA
Heating
* 1 for MVZ model.
Single unit connection is possible with MVZ model.
4HP
Rated capacity
(kBTU/h)
36
45
R410A
Connectable
indoor unit
Capacity
Number of units
Total system wide capacity
Type 06 to Type 36
2(*) to 4 units
1 or 2 units
33 to 130% of outdoor
unit capacity
(12 to 46.8 kBTU/h)
Number of units
Outdoor unit
Branch box PAC-MKA50BC
5 branches
(MAX. 5 units)
PAC-MKA30BC
3 branches
(MAX. 3 units)
Number of branches
Indoor unit that
can be connected
( )
Note: A maximum of 2 branch boxes can be connected to 1 outdoor unit.
Select a model according to the connection method.
2- branch pipe (joint): Optional parts
In case of using 1- branch box
In case of using 2- branch boxes
No need
Model name Connection method
flare
brazing
MSDD-50AR-E
MSDD-50BR-E
Option Optional accessories for indoor units and outdoor units are available.
Ceiling
concealed
4-way ceiling
cassette
Wall
mounted
Model type Model name
Deluxe
Standard
Low static pressure
Middle static pressure
2 by 2 type
Standard
MSZ-FE09/12/18NA
MSZ-FH09/12/15NA
MSZ-GE06/09/12/15/18/24NA
SEZ-KD09/12/15/18NA
PEAD-A24/30/36AA4
SLZ-KA09/12/15NA
PLA-A12/18/24/30/36BA4
MFZ-KA09/12/18NA
MVZ-A12/18/24/30/36AA4
Floor standing
Capacity class [kBTU/h]
06
Connectable indoor unit lineups (Heat pump inverter type)
MXZ-4C36NAHZ
Cooling
Refrigerant
4.5HP 5HP
42
48
48
54
Caution: The indoor unit which rated capacity exceeds
36 kBTU/ h (Type 36) can NOT be connected.
2(*) to 5 units 2(*) to 8 units
29 to 130% of outdoor
unit capacity
(12 to 54.6 kBTU/h)
25 to 130% of outdoor
unit capacity
(12 to 62.4 kBTU/h)
Connectable
branch box
09 12 15 18 24 30 36
Multi-position
OCH573

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Indoor unit (Ceiling concealed type)
Indoor unit
(Wall mounted type)
Outdoor unit Branch Box
2-2. SYSTEM OUTLINE
The additional connection of the branch box together with employment of the compact trunk-looking outdoor unit can suc-
cessfully realize a long distance piping for large houses. Equipped with a microcomputer, the branch box can translate the
transmission signal of indoor units to achieve the optimum control.
2-2-1. System example
2-2-2. Method for identifying
■ Outdoor unit
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
Service No. : 0, 1, 2, ···,etc.
M X Z-4 88 C N A
P A C-MK A5 0 B C
H Z
(Indispensable)
Optional parts
Symbol of factory
Branch box (Controller)
Number of branches
5 : 5 branches
3 : 3 branches
Marketable area
A: America
■ Branch box
OCH573

7
2-3. TYPICAL COMBINATION EXAMPLE
Branch box is located INSIDE of condominium
Branch box
(Inside)
Installing branch box indoors
Only 1 piping is required between the outdoor and
indoor offering a fine external view.
Branch box (5 branch 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
■ System example of 5 indoor units
■ Verification (In case of MXZ-8C48NAHZ)
The rated capacity should be determined by observing the table below. The unit’s quantities are limited to 1(*) to 8
units. For the next step, make sure that the selected total rated capacity is in a range of 12 to 62.4 kBTU/h.
The total indoor unit capacity should be within the outdoor units. (= 48.0 kBTU/h is preferred).
Combination of excessive indoor units and an outdoor unit may reduce the capacity of each indoor unit.
The rated indoor capacity is as the table below.
*Single unit connection is possible only with MVZ model. Connect 2 or more units for models other than MVZ.
Example:
Total rated capacity
60 62.4 kBTU/h
MSZ-09 = 9
+
+
+
+
SEZ-18 = 18
MSZ-12 = 12
MSZ-12 = 12
MSZ-09 = 9
OCH573

8
2-4. SIMPLIFIED PIPING SYSTEM
Piping connection size
Liquid
Gas
{3/8 in
[9.52 mm]
{5/8 in
[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.)
A B
Flare connection employed. (No brazing!)
A
B B B B B
Branch box
■ In case of using 1-branch box
Flare connection employed (No brazing)
AA
A
B B B B B
2 branches pipe (joint)
: optional parts
Branch box #1
Branch box #2
■ In case of using 2-branch boxes
■ Installation procedure (2 branches pipe (joint))
Refer to the installation manuals of MSDD-50AR-E and MSDD-50BR-E.
OCH573

9
3 SPECIFICATIONS
3-1. OUTDOOR UNIT : MXZ-4C36/5C42/8C48NAHZ, MXZ-8C48NA
Conversion formula:
kcal/h = kW o860
BTU/h = kW o3412
CFM = m3/min o35.31
Service Ref. MXZ-4C36NAHZ MXZ-5C42NAHZ
Standard performance
Indoor type
Non-Ducted Mix Ducted Non-Ducted Mix Ducted
Cooling
Capacity Rated*1 BTU/h 36,000 36,000 36,000 42,000 42,000 42,000
Rated power consumption*1
W2,570 2,875 3,180 3,130 3,510 3,890
EER BTU/Wh 14.01 12.52 11.32 13.42 11.97 10.80
SEER BTU/Wh 19.1 17.5 15.8 19.0 17.0 15.0
Heating
Capacity Rated 47°F *1
BTU/h 45,000 45,000 45,000 48,000 48,000 48,000
Capacity Max. 17°F
*2
BTU/h 45,000 45,000 45,000 48,000 48,000 48,000
Capacity Max. 5°F BTU/h 45,000 45,000 45,000 48,000 48,000 48,000
Rated power consumption 47°F *1 W3,340 3,795 4,250 3,430 3,890 4,350
COP 47°F
*1
BTU/Wh 3.95 3.48 3.10 4.10 3.62 3.23
HSPF 4/5BTU/Wh 11.3/9.2 10.7/8.9 10.1/8.5 11.0/9.1 10.6/9.0 10.1/8.8
OUTDOOR UNIT
Connectable indoor units (Max.) 4 5
Max. Connectable Capacity 46,000 54,000
Power supply 1 Phase 208 / 230 V, 60 Hz
Breaker Size / Max. fuse size 50 A/ 52 A
Min. circuit ampacity 42 A
Sound level (Cool/Heat) dB 49/ 53 50/ 54
External nish Munsell 3Y 7.8/ 1.1
Refrigerant control Linear Expansion Valve
Compressor Hermetic
Model ANB33FJSMT
Motor output kW 2.8 3.0
Starting method Inverter
Heat exchanger Plate n coil
Fan Fan (drive) × No. Propeller fan × 2
Fan motor output kW 0.06 + 0.06
Airow m³/min
(CFM) 110 (3885)
Dimensions
(H × W × D)
W
in (mm) 41-11/32 (1050)
D
in (mm) 13+1 (330+25)
H
in (mm) 52-11/16 (1338)
Weight lb (kg) 276 (125)
Refrigerant R410A
Charge lb (kg) 10 lbs. 9 oz.(4.8)
Oil/ Model oz (L) 73 (2.3)
Protection de-
vices
High pressure protection HP switch
Compressor protection
Compressor thermo, Overcurrent detection
Fan motor protection Overheating / Voltage protection
Guaranteed operation range (cool) D.B 23 to 115°F . [ D.B.−5 to 46°C ]
*3
(heat) D.B. −13 to 70°F [D.B. −25 to 21°C ]
REFRIGERANT PIPING
Total Piping length (Max.) ft (m) 492 (150)
Farthest ft (m) 262 (80)
Max. Height difference ft (m) 164 (50)
*4
Chargeless length ft (m) 0
Piping diameter Liquid [in (mm) [3/8 (9.52)
Gas
[in (mm) [5/8 (15.88)
Connection
method
Indoor side Flared
Outdoor side Flared
*1 Rating conditions Cooling Indoor : D.B. 80°F/ W.B. 67 °F [D.B.26.7°C/ W.B. 19.4°C]
Outdoor : D.B. 95°F [D.B. 35.0°C]
Heating Indoor : D.B. 70°F [D.B. 21.1°C]
Outdoor : D.B. 47°F/ W.B. 43°F [D.B. 8.3°C/ W.B. 6.1°C]
*2 Conditions Heating Indoor : D.B. 70°F [D.B. 21.1°C]
Outdoor : D.B. 17°F/ W.B. 15°F [D.B. −8.3°C/ W.B. −9.4°C]
*3 D.B. 5 to 115°F [D.B. −15 to 46°C], when an optional Air Outlet Guide is installed.
*4 131 ft [40 m], in case of installing outdoor unit lower than indoor unit.
Note: Refer to the indoor unit's service manual for the indoor units specications.
Continue to the next page
OCH573

10
Service Ref. MXZ-8C48NAHZ MXZ-8C48NA
Standard performance
Indoor type
Non-Ducted Mix Ducted Non-Ducted Mix Ducted
Cooling
Capacity Rated*1 BTU/h 48,000 48,000 48,000 48,000 48,000 48,000
Rated power consumption*1
W4,000 4,525 5,050 4,000 4,525 5,050
EER BTU/Wh 12.00 10.61 9.50 12.00 10.61 9.50
SEER BTU/Wh 18.9 16.8 14.7 18.9 16.8 14.7
Heating
Capacity Rated 47°F *1
BTU/h 54,000 54,000 54,000 54,000 54,000 54,000
Capacity 17°F
*2
BTU/h 54,000 54,000 54,000 36,600 36,600 36,600
Capacity 5°F BTU/h 54,000 54,000 54,000 32,400 32,400 32,400
Rated power consumption 47°F*
1
W4,220 4,605 4,990 4,220 4,605 4,990
COP 47°F
*
1
BTU/Wh 3.75 3.44 3.17 3.75 3.44 3.17
HSPF 4/5BTU/Wh 11.0/9.2 10.5/9.2 10.0/9.2 11.4/8.7 10.8/8.6 10.1/8.4
OUTDOOR UNIT
Connectable indoor units (Max.) 8
Max. Connectable Capacity 62,000
Power supply 1 Phase 208 / 230 V, 60 Hz
Breaker Size / Max. fuse size 50 A/ 52 A 40 A/ 52 A
Min. circuit ampacity 42 A 37 A
Sound level (Cool/Heat) dB 51/ 54
External nish Munsell 3Y 7.8 / 1.1
Refrigerant control Linear Expansion Valve
Compressor Hermetic
Model ANB33FJSMT ANB33FNHMT
Motor output kW 3.4
Starting method Inverter
Heat exchanger Plate n coil
Fan Fan (drive) × No. Propeller fan × 2
Fan motor output kW 0.06 + 0.06
Airow m³/min
(CFM) 110 (3885)
Dimensions
(H × W × D)
Win (mm) 41-11/32 (1050)
D in (mm) 13+1 (330+25)
H in (mm) 52-11/16 (1338)
Weight lb (kg) 276 (125) 269 (122)
Refrigerant R410A
Charge lb (kg) 10 lbs. 9 oz. (4.8 )
Oil / Model oz (L) 73 (2.3)
Protection
devices
High pressure protection HP switch
Compressor protection
Compressor thermo, Over current detection
Fan motor protection Overheating / Voltage protection
Guaranteed operation range (cool) D.B. 23 to 115°F [ D.B. −5 to 46°C]
*3
(heat) D.B. −13 to 70°F [D.B. −25 to 21°C] D.B. −4 to 70°F [D.B. −20 to 21°C]
REFRIGERANT PIPING
Total Piping length (Max.) ft (m) 492 (150)
Farthest ft (m) 262 (80)
Max. Height difference ft (m) 164 (50)
*4
Chargeless length ft (m) 0
Piping diameter Liquid
[in (mm) [3/8 (9.52)
Gas
[in (mm) [ 5/8 (15.88)
Connection
method
Indoor side Flared
Outdoor side Flared
*1 Rating conditions Cooling Indoor : D.B. 80°F/ W.B. 67°F [D.B. 26.7°C/ W.B. 19.4°C]
Outdoor : D.B. 95°F [D.B. 35.0°C]
Heating Indoor : D.B. 70°F [D.B. 21.1°C]
Outdoor : D.B. 47°F/ W.B. 43°F [D.B. 8.3°C / W.B. 6.1°C]
*2 Conditions Heating Indoor : D.B. 70°F [D.B. 21.1°C]
Outdoor : D.B. 17°F/ W.B. 15°F [D.B. −8.3°C/ W.B. −9.4°C]
*3 D.B. 5 to 115°F [D.B. −15 to 46°C], when an optional Air Outlet Guide is installed.
*4 131 ft [40 m], in case of installing outdoor unit lower than indoor unit.
Note: Refer to the indoor unit's service manual for the indoor units specications.
Conversion formula:
kcal/h = kW o860
BTU/h = kW o3412
CFM = m3/min o35.31
OCH573