Mitsubishi Electric Mr.SLIM PUZ-HA24NHA Manuale utente

SERVICE MANUAL

CONTENTS

1. REFERENCE MANUAL····························· 2

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

3. FEATURES ············································· 6

4. SPECIFICATIONS ···································· 7

5. DATA······················································ 8

6. OUTLINES AND DIMENSIONS················· 10

7. WIRING DIAGRAM································· 11

8. WIRING SPECIFICATIONS ······················ 12

REFRIGERANT SYSTEM DIAGRAM

············ 16

10. TROUBLESHOOTING ····························· 17

11. EASY MAINTENANCE FUNCTION ············ 70

12. FUNCTION SETTING ······························ 72

13.

MONITORING THE OPERATION DATA BY THE REMOTE CONTROLLER

··········77

14. DISASSEMBLY PROCEDURE ·················· 87

R410A

Notes:

• This manual describes service

data of the outdoor units only.

[Model Name]

PUZ-HA24NHA

[Service Ref.]

PUZ-HA24NHA

PARTS CATALOG (OCB721)

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

No. OCH721

REVISED EDITION-A

October 2019

Revision:

• Some descriptions have

been modified

in REVISED EDITION-A.

OCH721 is void.

OCH721A

2SAFETY PRECAUTION

1REFERENCE MANUAL

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

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 off the power-supply beaker.

• Discharge the condenser before the work involving the electric parts.

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 off 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.

2-1. ALWAYS OBSERVE FOR SAFETY

INDOOR UNIT

Model name Service Ref. Service manual No.

PLA-A24EA7 PLA-A24EA7 OCH640/OCB640

PKA-A24KA7 PKA-A24KA7.TH OCH639/OCB639

PCA-A24KA7 PCA-A24KA7.TH OCH638/OCB638

PEAD-A24AA7 PEAD-A24AA7 HWE1608A/BWE01629A

PVA-A24AA7 PVA-A24AA7 MD-1404-K011/MD-1404-K012

OCH721A

Cautions for units utilizing refrigerant R410A

2-2. CAUTIONS RELATED TO NEW REFRIGERANT

Use new refrigerant pipes.

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.

Store the piping indoors, and both ends of the

piping sealed until just before brazing.

(Leave elbow joints, etc. in their packaging.)

The refrigerant oil applied to flare and flange

connections must be ester oil, ether oil or

alkylbenzene oil in a small amount.

In case of using the existing pipes for R22, be careful with

the following.

· Be sure to clean the pipes and make sure that the insides

of the pipes are clean.

· Change flare nut to the one provided with this product.

Use a newly flared pipe.

· Avoid using thin 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.

Contamination inside refrigerant piping can cause deterio-

ration of refrigerant oil, etc.

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

cause deterioration of refrigerant oil or malfunction of com-

pressor.

If large amount of mineral oil enters, that can cause deterio-

ration of refrigerant oil, etc.

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

Use the specified refrigerant only.

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.

Ventilate the room if refrigerant leaks during

operation. If refrigerant comes into contact with

a flame, poisonous gases will be released.

OCH721A

Electric 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) When performing service, install a filter drier simultaneously.

Be sure to use a filter drier for new refrigerant.

[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.)

No. Tool name Specifications

1Gauge manifold · Only for R410A

· Use the existing fitting specifications.

· Use high-tension side pressure of 5.3MPa·G or over.

2Charge hose · Only for R410A

· Use pressure performance of 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 —

OCH721A

2-3. 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 time 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.)

Nominal

dimensions (in)

Outside

diameter (mm)

Thickness: in (mm)

R410A R22

1/4 6.35 1/32 [0.8] 1/32 [0.8]

3/8 9.52 1/32 [0.8] 1/32 [0.8]

1/2 12.70 1/32 [0.8] 1/32 [0.8]

5/8 15.88 5/128 [1.0] 5/128 [1.0]

3/4 19.05 — 5/128 [1.0]

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 air tightness and strength, flare cutting dimension of copper pipe for R410A has been specified sep-

arately 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.

Dimension A

Dimension B

3Tools for R410A (The following table shows whether conventional tools can be used or not.)

Tools and materials Use R410A tools Can R22 tools be used?

Gauge manifold Air purge, refrigerant charge and

operation check

Tool exclusive for R410A

Charge hose Tool exclusive for R410A

Gas leak detector Gas leak check Tool for HFC refrigerant

Refrigerant recovery equipment Refrigerant recovery Tool exclusive for R410A

Refrigerant cylinder Refrigerant charge Tool exclusive for R410A

Applied oil Apply to ared section Ester oil and alkylbenzene oil

(minimum amount)

Safety charger Prevent compressor malfunction when

charging refrigerant by spraying liquid

refrigerant

Tool exclusive for R410A

Charge valve Prevent gas from blowing out when

detaching charge hose

Tool exclusive for R410A

Vacuum pump Vacuum drying and air purge Tools for other refrigerants can be

used if equipped with adopter for

reverse ow check

(Usable if equipped with adopter for

reverse ow)

Flare tool Flaring work of piping Tools for other refrigerants can be

used by adjusting aring dimension

(Usable by adjusting aring

dimension)

Bender Bend the pipes

Tools for other refrigerants can be used

Pipe cutter Cut the pipes

Tools for other refrigerants can be used

Welder and nitrogen gas cylinder Weld the pipes

Tools for other refrigerants can be used

Refrigerant charging scale Refrigerant charge

Tools for other refrigerants can be used

Vacuum gauge or thermistor vacuum

gauge and vacuum valve

Check the degree of vacuum. (Vacuum

valve prevents back ow of oil and

refrigerant to thermistor vacuum gauge)

Tools for other refrigerants can be

used

Charging cylinder Refrigerant charge Tool exclusive for R410A

: 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.

Flare cutting dimensions

Nominal

dimensions (in)

Outside

diameter (mm)

Dimension A ( + 0

-0.4 )

R410A (in[mm]) R22 (mm)

1/4 6.35 11/32-23/64 [ 9.1] 9.0

3/8 9.52 1/2-33/64 [13.2] 13.0

1/2 12.70 41/64-21/32 [16.6] 16.2

5/8 15.88 49/64-25/32 [19.7] 19.4

3/4 19.05 — 23.3

Flare nut dimensions

Nominal

dimensions (in)

Outside

diameter (mm)

Dimension B

R410A (in[mm]) R22 (mm)

1/4 6.35 43/64 [17.0] 17.0

3/8 9.52 7/8 [22.0] 22.0

1/2 12.70 1-3/64 [26.0] 24.0

5/8 15.88 1-9/64 [29.0] 27.0

3/4 19.05 — 36.0

OCH721A

3 FEATURES

HIGH HEATING CAPACITY

High capacity compressor is equipped, which enables to keep

the equal capacity to the rating even when outside temperature

is 5°F [−15°C].

WIDE HEATING RANGE

The heating range is expanded to −13°F [−25°C] compared to

PUZ-A type which is up to 10°F [−12°C].

CHARGELESS SYSTEM

PRE-CHARGED REFRIGERANT IS SUPPLIED FOR PIPING LENGTH AT SHIPMENT.

Maximum 70 ft, 21m

The refrigerant circuit with LEV (Linear Expansion Valve) and power receiver always control the optimal refrigerant level

regardless of the length (maximum: 70 ft [21 m] and minimum: 16 ft [5 m]) of piping. The additional refrigerant charg-

ing work during installation often causes problems. It is completely eliminated by chargeless system. This unique system

improves the quality and reliability of the work done. It also helps to speed up the installation time.

PUZ-HA24NHA

Outdoor W.B. temp.

Heating capacity

-13°F

[-25°C]

-4°F

[-20°C]

5°F

[-15°C]

14°F

[-10°C]

23°F

[-5°C]

32°F

[0°C]

A24

HA24

30,000

(Btu/h)

20,000

16,500Btu/h

26,000Btu/h

Performance

about

60%UP

Expanded

Up to -13

°F

Outdoor wet-bulb temperature

A24 type

HA24 type

-13°F

10°F

-13°F

[-25°C]

-4°F

[-20°C]

5°F

[-15°C]

14°F

[-10°C]

23°F

[-5°C]

32°F

[0°C]

OCH721A

4 SPECIFICATIONS

Service Ref. PUZ-HA24NHA

Power supply Phase Single

Cycle 60 Hz

Voltage 208/230 V

MCA A 19

MOCP A 26

Breaker size A 25

External nish Munsell 3Y 7.8/1.1

Heat exchanger Plate n coil

Defrost method Reverse cycle

Crankcase heater kW —

Compressor Hermetic

Model DNB28FBAMT

Motor output kW 4.7

R.L.A. 9

L.R.A. 18

Starter type Inverter

Fan Fan(drive) × No. Propeller fan x 1

Fan motor output kW 0.086

Fan motor F.L.A. 0.40

Airow m3/min 55

CFM 1940

Sound pressure level (SPL) Cooling dB 52

Heating dB 53

Protection devices HP switch

Comp. Surface thermistor

Dimensions W mm 950

D mm 330 + 30

H mm 943

W in 37 - 13/32

D in 13 + 1-3/16

H in 37 - 1/8

Weight kg 85

lb 188

Refrigerant R410A

Charged kg 3.5

lb 7 + 11/16

Control Linear expansion valve

Oil Charged Model FVC68D

L 1.0

oz 33

Refrigerant piping Pipe size O.D.

Liquid

mm 9.52

in 3/8

Pipe size O.D.

Gas

mm 15.88

in 5/8

Connection method Indoor Flared

Connection method Outdoor Flared

Height difference

IU-OU

m Maximum 30

ft Maximum 100

Piping length m Maximum 50

ft Maximum 165

OCH721A

5-1. REFILLING REFRIGERANT CHARGE (R410A: oz, kg)

Service Ref. Piping length (one way)

PUZ-HA24NHA 50 ft 60 ft 70 ft 80 ft 90 ft 100 ft 110 ft 120 ft 130 ft 140 ft 150 ft 160 ft 165 ft Factory

charged

15 m 18 m 21 m 24 m 27 m 30 m 34 m 37 m 40 m 43 m 46 m 49 m 50 m

123 oz 123 oz 123 oz 130 oz 137 oz 144 oz 151 oz 158 oz 165 oz 172 oz 179 oz 186 oz 190 oz 123 oz

3.5 kg 3.5 kg 3.5 kg 3.7 kg 3.9 kg 4.1 kg 4.3 kg 4.5 kg 4.7 kg 4.9 kg 5.1 kg 5.3 kg 5.4 kg 3.5 kg

5-2. COMPRESSOR TECHNICAL DATA

(Winding resistance at 68°F [20°C])

Service Ref. PUZ-HA24NHA

Compressor model DNB28FBAMT

Winding resistance

(Ω)

U-V 0.74

U-W 0.74

W-V 0.74

5DATA

5-3. NOISE CRITERION CURVES

PUZ-HA24NHA

63 125 250 500 1000 2000 4000 8000

COOLING

MODE

HEATING

SPL(dB)

LINE

OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)

BAND CENTER FREQUENCIES, Hz

APPROXIMATE

THRESHOLD OF

HEARING FOR

CONTINUOUS

NOISE

5 ft

3.3 ft

MICROPHONE

UNIT

GROUND

NC-60

NC-50

NC-40

NC-30

NC-20

NC-70

Additional charge is required for pipes longer than 70 ft.

OCH721A

5-4. STANDARD OPERATION DATA

Representative matching PLA-A24EA7

Mode COOLING HEATING

Total Capacity Btu/h 24,000 26,000

Input W 1,710 1,700

Electrical circuit

Indoor unit model PLA-A24EA7

Phase Single

Cycle 60 Hz

Voltage 208/230 V

Current 0.49 A

Outdoor unit model PUZ-HA24NHA

Phase Single

Cycle 60 Hz

Voltage 208/230 V

Current 7.40 A

Refrigerant circuit

Discharge pressure PSIG 383 325

Suction pressure PSIG 145 101

Discharge temperature °F 146 141

Condensing temperature °F 114 98

Suction temperature °F 57 40

Ref. Pipe length ft 25 25

Discharge pressure Mpa 2.64 2.24

Suction pressure Mpa 1 0.7

Discharge temperature °C 63.5 60.5

Condensing temperature °C 45.3 36.7

Suction temperature °C 14 4.4

Ref. Pipe length m 7.6 7.6

Indoor

side

Intake air temperature D.B. °F 80 70

Intake air temperature W.B. °F 67 60

Discharge air temperature D.B. °F 58 100

Outoor

side

Intake air temperature D.B. °F 95 47

Intake air temperature W.B. °F 75 43

Indoor

side

Intake air temperature D.B. °C 26.7 21.1

Intake air temperature W.B. °C 19.4 15.6

Discharge air temperature D.B. °C 14.3 37.5

Outoor

side

Intake air temperature D.B. °C 35 8.3

Intake air temperature W.B. °C 23.9 6.1

SHF 0.86 ―

BF 0.05 ―

OCH721A

6OUTLINES AND DIMENSIONS

PUZ-HA24NHA Unit: mm<inch>

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