Mitsubishi Electric MXZ-SM48NAM Manuel d'utilisation

TECHNICAL & SERVICE MANUAL

OUTDOOR UNIT

No. OCH789

HFC

utilized

R410A

November 2021

Note:

• This service manual

describes technical data of

the outdoor units only.

[Model Name]

Model name

indication

PARTS CATALOG (OCB789)

MXZ-SM36NAM

MXZ-SM48NAM

MXZ-SM60NAM

MXZ-SM36NAMHZ

MXZ-SM42NAMHZ

MXZ-SM48NAMHZ

MXZ-SM36NAM-U1

MXZ-SM48NAM-U1

MXZ-SM60NAM-U1

MXZ-SM36NAMHZ-U1

MXZ-SM42NAMHZ-U1

MXZ-SM48NAMHZ-U1

[Service Ref.]

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

CONTENTS

1. SAFETY PRECAUTION ·······················2

2. OVERVIEW OF UNITS ························ 5

3. SPECIFICATIONS ···························· 11

4. DATA·············································· 14

5. OUTLINES AND DIMENSIONS ··········· 36

6. WIRING DIAGRAM ··························· 37

7. NECESSARY CONDITIONS

FOR SYSTEM CONSTRUCTION········· 40

8. TROUBLESHOOTING ······················· 55

9. ELECTRICAL WIRING ·····················134

10. REFRIGERANT PIPING TASKS ·········140

11. DISASSEMBLY PROCEDURE ···········148

OCH789

Cautions for units utilizing refrigerant R410A

1-2. CAUTIONS RELATED TO NEW REFRIGERANT

1SAFETY PRECAUTION

1-1. ALWAYS OBSERVE FOR SAFETY

Before obtaining access to terminal, all supply circuit must be disconnected.

Precautions during the repair service

•

Do not perform the work involving the electric parts with wet

hands.

• Do not pour water into the electric parts.

• Do not touch the refrigerant.

•

Do not touch the hot or cold areas in the refrigerating

cycle.

• When the repair or the inspection of the circuit needs

to be done without turning o󰀨 the power, exercise great

caution not to touch the live parts.

•

When opening or closing the valve below freezing

temperatures, refrigerant may spurt out from the gap

between the valve stem and the valve body, resulting in

injuries.

Preparation before the repair service

• Prepare the proper tools.

• Prepare the proper protectors.

• Provide adequate ventilation.

• After stopping the operation of the air conditioner, turn

o󰀨 the power-supply breaker.

• Discharge the condenser before the work involving the

electric parts.

Use new refrigerant pipes.

Avoid using thin pipes.

Use a vacuum pump with a reverse ow check

valve.

Vacuum pump oil may ow back into refrigerant cycle and

that can cause deterioration of refrigerant oil, etc.

Handle tools with care.

If dirt, dust or moisture enters into refrigerant cycle, that

can cause deterioration of refrigerant oil or malfunction of

compressor.

Do not use a charging cylinder.

If a charging cylinder is used, the composition of refrigera-

nt will change and the e󰀩ciency will be lowered.

Ventilate the room if refrigerant leaks during

operation. If refrigerant comes into contact with

a ame, poisonous gases will be released.

Use the following tools specically designed for

use with R410A refrigerant.

The following tools are necessary to use R410A

refrigerant.

Tools for R410A

Gauge manifold Flare tool

Charge hose Size adjustment gauge

Gas leak detector Vacuum pump adaptor

Torque wrench Electronic refrigerant

charging scale

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 specied thickness.

Contamination inside refrigerant piping can cause deterio-

ration of refrigerant oil, etc.

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.

Follow the instructions below to prevent abrasive

components contained in sandpaper and cutting

tools from entering the refrigerant circuit because

those components can cause failures of the

compressor and valves.

• To deburr pipes, use a reamer or other deburring tools,

not sandpaper.

• To cut pipes, use a pipe cutter, not a grinder or other tools

that use abrasive materials.

• When cutting or deburring pipes, do not allow cutting

chips or other foreign matters to enter the pipes.

• If cutting chips or other foreign matters enter pipes, wipe

them o󰀨 the inside of the pipes.

OCH789

Electronic weighing scale

Unit

[3] Service tools

Use the below service tools as exclusive tools for R410A refrigerant.

[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.

[2] Additional refrigerant charge

When charging directly from cylinder

(1) Check that cylinder for R410A on the market is a syphon type.

(2) Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)

No. Tool name Specifications

1Gauge manifold · Only for R410A

· Use the existing fitting specifications. (UNF1/2)

· Use high-tension side pressure of 768.7 PSIG [5.3 MPa.G] or over.

2Charge hose · Only for R410A

· Use pressure performance of 738.2 PSIG [5.09MPa.G] or over.

3Electronic weighing scale —

4Gas leak detector · Use the detector for R134a, R407C or R410A.

5Adaptor for reverse flow check · Attach on vacuum pump.

6Refrigerant charge base —

7Refrigerant cylinder · Only for R410A · Top of cylinder (Pink)

· Cylinder with syphon

8Refrigerant recovery equipment —

Use the specied refrigerant only.

Never use any refrigerant other than that specied.

Doing so may cause a burst, an explosion, or re when

the unit is being used, serviced, or disposed of.

Correct refrigerant is specied 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.

The refrigerant oil applied to are and ange

connections must be ester oil, ether oil or

alkylbenzene oil in a small amount.

If large amount of mineral oil enters, that can cause

deterioration of refrigerant oil, etc.

Charge refrigerant from liquid phase of gas

cylinder.

If the refrigerant is charged from gas phase, composition

change may occur in refrigerant and the e󰀩ciency 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.

Do not pump down the system when a gas leak

has been detected.

The intake of air or other gases causes abnormally high

pressure in the refrigeration cycle, which may cause

explosion or injury.

OCH789

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.

1Thickness 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.)

2Dimensions 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 strength, flare cutting dimension of copper pipe for R410A has been specified sepa-

rately from the dimensions for other refrigerants as shown below. The dimension B of flare nut for R410A also has partly

been changed to increase strength as shown below. Set copper pipe correctly referring to copper pipe flaring dimensions for

R410A below. For 1/2 and 5/8 inch pipes, the dimension B changes.

Use torque wrench corresponding to each dimension.

3Tools 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]

5/128 [1.0]

5/128 [1.0]*

1/32 [0.8]

5/128 [1.0]

Nominal

dimensions

(in)

Diagram below: Piping diameter and thickness

Outside

diameter (mm)

Thickness : in [mm]

R410A

*Use 1/2 H or H pipes.

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 ( )

-0.4

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 for HFC refrigerant

Tool exclusive for R410A

Ester oil, ether oil and

alkylbenzene oil (minimum amount)

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

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

OCH789

2OVERVIEW OF UNITS

2-1. Auxiliary HEATING ON/OFF CONTROL SET-UP

(1)

Auxiliary heating operation controls another heat source that depends on the main system's operations,

which means the interlock operation shown in "b)" will be possible.

b) Different Indoor unit applications that can be applied:

(2) Outdoor unit DIPSW5-4 for auxiliary heating control:

Set DIPSW5-4 when power is turned off at unit.

OFF: Disable auxiliary Heating Function (Initial setting)

ON : Enable auxiliary Heating Function

Indoor unit must be R410A UL model for this function to operate.

(3) Determine required indoor fan speed during defrost mode:

To set the fan speed, see the chapter referring to heater control in the indoor unit’s Technical & Service Manual.

OCH789

When the set temperature ranges overlap, the previously set pattern (1, 2 or 3) has a priority.

The stage 1 has the highest priority, 2 the second and then 3.

b) Based on above chart listed the sequence of operation on "On ambient decrease"

Stage 1: (TH7 = > 50°F [10

]): the outdoor unit runs in HP mode.

Stage 2: (TH7 = 50 to −13°F [10

to −25

]): the outdoor unit runs in HP mode with auxiliary heating.

Stage 3: (TH7 = < −13°F [−25

]): Auxiliary heating only (Outdoor unit is OFF).

c) Based on above chart listed the sequence of operation on "On ambient increase"

Stage 3: (TH7 = < 32°F [0

]): Auxiliary heating only (Outdoor unit is OFF).

Stage 2: (TH7 = > 32 to 68°F [0 to 20

]): Auxiliary heating with outdoor unit in HP mode.

Stage 1: (TH7 = > 68°F [20

]): Outdoor unit in HP mode only.

(4) Determine fan speed setting during indoor thermo-OFF conditions:

a) These settings are done within Indoor DIPSW1-7 and DIPSW1-8, see chart below for options.

b) Recommended SW1-7 OFF and SW1-8 ON will determine airflow based on "Setting on the remote controller".

Fan speed

setting

Fan speed

setting

OFF ON

SW1-7 SW1-8

OFF OFF Very low

ON OFF Low

OFF ON

Setting on

remote

controller

Stopped

Auxiliary heating

signal

Thermo condition

(5) Setting outdoor unit and auxiliary heat switch over temperatures

When the DIPSW 5-4 is set to "ON", the outdoor unit and the contact output operates as shown below.

a) Outdoor default setting and operations are shown below:

Stage 1

mb. decreasing - Outdoor unit HP operation

Amb. increasing - Defrost : Heater contact ON signal

- Other than defrost : Contact OFF

Stage 2

- Outdoor unit HP operation

- Heater contact ON signal

Stage 3

- Outdoor unit OFF (Standby)

- Heater contact ON signal

TH7 = Outdoor temperature

−25

-C

[

−

13-F]

-C

[32-F]

-C

[50-F]

-C

[68-F]

Setting on

remote

controller

OCH789

(6) Locally procured wiring

A basic connection method is shown.

(i.e. interlocked operation with the electric heater with the fan speed setting on high)

Recommended circuit

CN24

CN22

Remote control Board Relay circuit Adapter

Indoor unit

control board

Outdoor unit

control board

Electric Heater

power source

Electric

Heater

Red 1

White 2

Dip switch

SW5-4 "ON"

Preparations in the field Maximum cable length

is 10 m (32ft)

Red 1

Red 2

YellowGreen

FS1

FS2

FS1

FS2

CN24

88H

26H

88H

1-phase power

supply

208V, 230V/60Hz

Control board

FS1, 2 ----- Thermal fuse

H1, H2 ----- Heater

26H --------- Overheat protection

thermostat

88H --------- Electromagnetic contactor

Wiring diagram

For relay X use the specifications given below operation coil

Rated voltage: 12 V DC

Power consumption: 0.9W or less

*Use the diode that is recommended by the relay manufacturer at both ends of the relay coil.

The length of the electrical wiring for the PAC-YU24HT is 2 meters (6-1/2 ft)

To extend this length, use sheathed 2-core cable.

Control cable type: CVV, CVS, CPEV, or equivalent.

Cable size: 0.5 mm2to 1.25 mm2(AWG22 to AWG16)

Do not extend the cable more than 10 meters (32 ft).

OCH789

2-2. SYSTEM CONSTRUCTION

Branching pipe

components

Branch header

(2 branches)

Branch header

(4 branches)

Branch header

(8 branches)

CMY-Y62-G-E CMY-Y64-G-E CMY-Y68-G-E

Model

Capacity

Cassette Ceiling Ceiling

Concealed Wall

Mounted

Ceiling

Suspended

Floor standing

Multi-position

air handling unit

4-way

ow 2 by 2

1-way

ow

Exposed

Concealed

PLFY-EP

PLFY-P PLFY-P PMFY-P PEFY-P PKFY-P

PCFY-P PFFY-P PFFY-P

PVFY-P

NEMU-E NCMU-E NFMU-E NBMU-E NMAU NMSU-E NMHU-E NMHSU-E NBMU-E NHMU-E NKMU-E NLMU-E NKMU-E NEMU-E NRMU-E NAMU-E

04 ––––––– – ––– – – – –

05 – – – – – – – – – – – – – – –

06 – – – – – – – – –

08 – – – – – –

12 – – – – –

15 – – – –

18 – – – – – –

24 – – – – – – –

27 – – – – – – – – – – – – – –

30 – – – – – – – – – –

36 – – – – – – – – – – –

48 – – – – – – – – – – – –

54 – – – – – – – – – – – – –

72 ––––––– *–––– – – – –

* Only MXZ-SM60 is connectable.

Outdoor unit

4HP 4.5HP 5HP 7HP

MXZ-SM36NAM-U1

MXZ-SM36NAMHZ-U1 MXZ-SM42NAMHZ-U1 MXZ-SM48NAM-U1

MXZ-SM48NAMHZ-U1 MXZ-SM60NAM-U1

Applicable

indoor unit

Capacity Type 04 to Type 36 Type 04 to Type 54 Type 04 to Type 72

Number of units 1 to 11 unit 1 to 12 unit

Total system

capacity range 50 to 130% of outdoor unit capacity

Remote

controller

Name M-NET remote controller MA remote controller

Model number PAR-F27MEA-E

PAR-U01MEDU PAR-21MAA, PAR-40MAA

Functions

• A handy remote controller for use in

conjunction with the Melans centralized

management system.

• Addresses must be set.

• Addresses setting is not necessary.

–: Not connectable

: Connectable

OCH789

Outdoor unit MXZ-SM36NAM-U1

MXZ-SM36NAMHZ-U1 MXZ-SM42NAMHZ-U1 MXZ-SM48NAM-U1

MXZ-SM48NAMHZ-U1 MXZ-SM60NAM-U1

4HP 4.5HP 5HP 7HP

Rated capacity

(kBtu/h)

Cooling 36 42 48 60

Heating 42 48 54 66

Refrigerant R410A

Connectable

indoor unit

Capacity class Type 06 to Type 36

Caution: The indoor unit which rated capacity exceeds

36 kBtu/ h (Type 36) can NOT be connected.

Number of units 2(*1) to 4 units 2(*1) to 5 units 2(*1) to 8 units 2(*1) to 8 units

Total system capacity range 33 to 130% of outdoor

unit capacity

(12 to 46.8 kBtu/h)

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)

20 to 130% of outdoor

unit capacity

(12 to 78 kBtu/h)

Connectable

branch box

Number of units 1 or 2 units

Connectable indoor unit lineups (Heat pump inverter type)

Model type Model name Capacity class [kBtu/h]

06 09 12 15 18 24 30 36

Deluxe Wall-mounted MSZ-FH06/09/12/15NA, 18NA2

MSZ-FS06/09/12/15/18NA

Designer MSZ-EF09/12/15/18NA(W/B/S)

Standard Wall-mounted MSZ-GL06/09/12/15/18/24NA

Low static ducted*3 *4 SEZ-KD09/12/15/18NA

P-series mid static ducted*3 *4 PEAD-A09/12/15/18/24/30/36AA7

1-way cassette MLZ-KP09/12/18NA(2)

P-series 22*22 4-way cassette SLZ-KF09/12/15NA

P-series 33*33 4-way cassette PLA-A12/18/24/30/36EA7*5

Floor standing MFZ-KJ09/12/15/18NA

Standard Multi-position air handler*2 SVZ-KP12/18/24/30/36NA

●Models other than MXZ-SM60NAM (For each connected branch box)

Number of connecting

multi-position unit Constraints

Any indoor units other than ducted units are not

connectable.

The total system wide capacity should be 130% or

below including the ducted unit.

· Only 1

ducted unit

can be included in the connection.

Option Optional accessories for indoor units and outdoor units are available.

2- branch pipe (joint): Optional parts

In the case of using 1- branch box No need

In the case of using 2- branch boxes Model name Connection method

MSDD-50AR-E are

MSDD-50BR-E brazing

Branch box PAC-MKA52BC PAC-MKA32BC

Number of branches

(Indoor unit that can be connected)

5 branches

(MAX. 5 units)

3 branches

(MAX. 3 units)

Note: A maximum of 2 branch boxes can be connected to 1 outdoor unit.

●MXZ-SM60NAM (For each connected branch box)

Number of connecting

multi-position unit

Constraints

Any indoor units other than

ducted unit

are not

connectable.

The total system wide capacity should be 100% or

below including the ducted unit.

· Only 1

ducted unit

can be included in the connection.

*3 For MXZ-SM60NAM; When connecting the SEZ and PEAD-series units, the total system wide capacity per 1 branch box should be 100% or below including

the

ducted unit

s. (Only if connecting to branch box)

*4 When not outside units 60: A branch box can connect to maximum 3 of the

ducted unit

s. When connecting with 3 of the

ducted unit

sper 1 branch box, other

indoor units cannot be connected.

When outside units 60: A branch box can connect to maximum 2 of the

ducted unit

s. When connecting with 1 and over 1 of the

ducted unit

s, the total ability

including of the

ducted unit

s is 100% and below 100%.

*5 When the system includes 1 unit of

ducted unit

s, the number of the maximum connectable indoor units is decreased as follows:

3 for MXZ-SM36NAM(HZ), 4 for MXZ-SM42NAMHZ, and 6 for MXZ-SM48NAM(HZ) and MXZ-SM60NAM

*1 Only one

unit connection is possible with ducted unit.

When connecting a multi-position unit(s), set additional constraints as follows. For connections other than those specied below, consult your dealer.

Select a model according to the

connection method.

OCH789

2-3. SYSTEM SPECIFICATIONS

(2) Method for identifying

(1) Outdoor Unit

Power supply

N: Single phase 208/230 V 60 Hz

Multi type heat

pump inverter

outdoor unit

Indicates equivalent to rated cooling capacity.

(kBtu/h)

Control and refrigerant

A: New A control and R410A

MXZ -36SM N AM -U1

Sub-number

Smart Multi

Cooling/Heating capacity indicates the maximum value at operation under the following condition.

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/W.B. 75°F: [D.B. 35°C/W.B. 23.9°C]

Heating Indoor D.B. 70°F/W.B. 60°F: [D.B. 21.1°C/W.B. 15.6°C]

Outdoor D.B. 47°F/W.B. 43°F: [D.B. 8.3°C/W.B. 6.1°C]

Service Ref. MXZ-SM36NAM-U1

MXZ-SM36NAMHZ-U1 MXZ-SM42NAMHZ-U1 MXZ-SM48NAM-U1

MXZ-SM48NAMHZ-U1 MXZ-SM60NAM-U1

Capacity Cooling (kBtu/h) 36 42 48 60

Heating (kBtu/h) 42 48 54 66

Compressor (kW) 2.8 2.9 3.4 3.9

Ce manuel convient aux modèles suivants

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