Mitsubishi Electric MVZ Series User manual

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
SERVICE MANUAL
Model name
<Indoor unit>
Model name
<Indoor unit>
Series MVZ
2015
MVZ-A12AA4
MVZ-A30AA4
MVZ-A36AA4
MVZ-A18AA4
MVZ-A24AA4
INDOOR UNIT

CONTENTS
1. SAFETY PRECAUTION 2
2. PART NAMES AND FUNCTIONS 3
3. SPECIFICATION 4
4. FAN PERFORMANCE AND CORRECTED AIR FLOW 6
5. SOUND PRESSURE LEVELS 12
6. OUTLINES & DIMENSIONS 15
7. WIRING DIAGRAM 17
8. REFRIGERANT SYSTEM DIAGRAM 18
9. HEATER CONTROL 19
1 . HUMIDIFIER CONTROL 22
11. ERV (ENERGY RECOVERY VENTILATION) CONTROL 23
12. TROUBLESHOOTING 24
13. DISASSEMBLY PROCEDURE 37

2
SAFETY PRECAUTION
1
1-1. ALWAYS OBSERVE FOR SAFETY
Cautions for units utilising refrigerant R410A
Use new refrigerant pipes.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contamination
such as sulfur hazardous for use, oxides, dirt,
shaving particles, etc.
In addition, use pipes with specified thickness.
Store the piping to be used indoors during
installation and both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
In case of using the existing pipes for R22, be careful with
the followings.
·For A36 and A42, be sure to perform replacement oper-
ation before test run.
·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.
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 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.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
[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 syphon type.
·Charging should be performed with the cylinder of syphon stood vertically. (Refrigerant is charged from liquid phase.)
Before obtaining access to terminal, all supply
circuits must be disconnected.
1-2. CAUTIONS RELATED TO NEW REFRIGERANT

3
Gravimeter
Unit
[3] Service tools
Use the below service tools as exclusive tools for R410A refrigerant.
No. Tool name Specifications
1Gauge manifold ·Only for R410A
·Use the existing fitting specifications. (UNF1/2)
·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 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
PART NAMES AND FUNCTIONS
2
•Indoor Unit
Air inlet
Air outlet
Air
inlet Air
outlet
(1)Vertical (2)Horizontal Right

4
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity A
A
External finish
Heat exchanger
Fan Fan (drive) ×No.
F
Fan motor
an motor output kW
F.L.A
Airflow (Low-Mid-High) m3/min (CFM)
External static pressure Pa (in.WG)
Operation control & Thermostat
Sound pressure level
(Low-Mid-High) dB (A)
Drain pipe mm (in.)
Dimensions W mm (in.)
D mm (in.)
H mm (in.)
kg (lbs)
INDOOR UNIT
Weight
75Pa (0.30 in.WG)
125Pa (0.50 in.WG)
200Pa (0.80 in.WG)
1 phase, 60Hz, 208/230V
15
3.00
MVZ-A12AA4
Galvanized steel cabinet - Powder coated Slate Gray
Plate fin coil
Sirocco fan ×1
0.121
2.4
7.9-9.6-11.3 (280-340-400)
75-125-200 (0.30-0.50-0.80)
Remote controller & built-in
24-28-32
27-31-35
32-36-41
19.05 (3/4) FPT
432 (17)
548 (21-5/8)
1275 (50-1/4)
51 (113)
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity A
A
External finish
Heat exchanger
Fan Fan (drive) ×No.
F
Fan motor
an motor output kW
F.L.A
Airflow (Low-Mid-High) m3/min (CFM)
External static pressure Pa (in.WG)
Operation control & Thermostat
Sound pressure level
(Low-Mid-High) dB (A)
Drain pipe mm (in.)
Dimensions W mm (in.)
D mm (in.)
H mm (in.)
kg (lbs)
INDOOR UNIT
Weight
75Pa (0.30 in.WG)
125Pa (0.50 in.WG)
200Pa (0.80 in.WG)
1 phase, 60Hz, 208/230V
15
3.00
MVZ-A18AA4
Galvanized Steel Cabinet - Powder coated Slate Gray
Plate fin coil
Sirocco fan ×1
0.121
2.4
11.6-14.1-16.6 (410-497-585)
75-125-200 (0.30-0.50-0.80)
Remote controller & built-in
26-30-34
28-32-36
33-37-41
19.05 (3/4) FPT
432 (17)
548 (21-5/8)
1275 (50-1/4)
51 (113)
SPECIFICATION
3
Air
inlet
Air
outlet
Air inlet
Air outlet
(3)Horizontal left (4)Down flow

5
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity A
A
External finish
Heat exchanger
Fan Fan (drive) ×No.
F
Fan motor
an motor output kW
F.L.A
Airflow (Low-Mid-High) m3/min (CFM)
External static pressure Pa (in.WG)
Operation control & Thermostat
Sound pressure level
(Low-Mid-High) dB (A)
Drain pipe mm (in.)
Dimensions W mm (in.)
D mm (in.)
H mm (in.)
kg (lbs)
INDOOR UNIT
Weight
75Pa (0.30 in.WG)
125Pa (0.50 in.WG)
200Pa (0.80 in.WG)
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity A
A
External finish
Heat exchanger
Fan Fan (drive) ×No.
F
Fan motor
an motor output kW
F.L.A
Airflow (Low-Mid-High) m3/min (CFM)
External static pressure Pa (in.WG)
Operation control & Thermostat
Sound pressure level
(Low-Mid-High) dB (A)
Drain pipe mm (in.)
Dimensions W mm (in.)
D mm (in.)
H mm (in.)
kg (lbs)
INDOOR UNIT
Weight
75Pa (0.30 in.WG)
125Pa (0.50 in.WG)
200Pa (0.80 in.WG)
Service Ref.
Power supply (phase, cycle, voltage)
Max. Fuse Size
Min. Circuit Ampacity A
A
External finish
Heat exchanger
Fan Fan (drive) ×No.
F
Fan motor
an motor output kW
F.L.A
Airflow (Low-Mid-High) m3/min (CFM)
External static pressure Pa (in.WG)
Operation control & Thermostat
Sound pressure level
(Low-Mid-High) dB (A)
Drain pipe mm (in.)
Dimensions W mm (in.)
D mm (in.)
H mm (in.)
kg (lbs)
INDOOR UNIT
Weight
75Pa (0.30 in.WG)
125Pa (0.50 in.WG)
200Pa (0.80 in.WG)
MVZ-A24AA4
1 phase, 60Hz, 208/230V
15
3.00
Galvanized Steel Cabinet - Powder coated Slate Gray
Plate fin coil
Sirocco fan ×1
0.121
2.4
14.6-17.7-20.8 (515-625-735)
75-125-200 (0.30-0.50-0.80)
Remote controller & built-in
28-33-36
30-34-38
34-38-42
19.05 (3/4) FPT
432 (17)
548 (21-5/8)
1275 (50-1/4)
51 (113)
MVZ-A30AA4
1 phase, 60Hz, 208/230V
15
4.13
Galvanized Steel Cabinet - Powder coated Slate Gray
Plate fin coil
Sirocco fan ×1
0.244
3.3
17.3-21.1-24.8 (613-744-875)
75-125-200 (0.30-0.50-0.80)
Remote controller & built-in
30-34-38
32-36-40
35-39-43
19.05 (3/4) FPT
534 (21)
548 (21-5/8)
1378 (54-1/4)
64 (141)
MVZ-A36AA4
1 phase, 60Hz, 208/230V
15
4.13
Galvanized Steel Cabinet - Powder coated Slate Gray
Plate fin coil
Sirocco fan ×1
0.244
3.3
21.7-26.4-31.0 (767-931-1095)
75-125-200 (0.30-0.50-0.80)
Remote controller & built-in
33-37-41
35-39-43
37-41-45
19.05 (3/4) FPT
534 (21)
548 (21-5/8)
1378 (54-1/4)
64 (141)

6
0
[0]
25
[0.10]
75
[0.30]
50
[0.20]
100
[0.40]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
7
[247]
10
[353]
14
[494]
7
[247]
10
[353]
14
[494]
7
[247]
10
[353]
14
[494]
7
[247]
10
[353]
14
[494]
50
[0.20]
75
[0.30]
125
[0.50]
100
[0.40]
150
[0.60]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
7
[247]
10
[353]
14
[494]
7
[247]
10
[353]
14
[494]
75
[0.30]
100
[0.40]
150
[0.60]
125
[0.50]
175
[0.70]
200
[0.80]
225
[0.90]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
0
[0]
25
[0.10]
75
[0.30]
50
[0.20]
100
[0.40]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
25
[0.10]
50
[0.20]
100
[0.40]
75
[0.30]
125
[0.50]
150
[0.60]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
75
[0.30]
100
[0.40]
150
[0.60]
125
[0.50]
175
[0.70]
200
[0.80]
225
[0.90]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
Low Low
Low
Middle
Middle
Middle
High High
High
Low
Low Low
Middle
Middle Middle
High
High High
MVZ-A12AA4
• Vertical, Horizontal Right, Horizontal Left • Downflow
External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz
External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz
External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz
External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz
External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz
External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz
FAN PERFORMANCE AND CORRECTED AIR FLOW
4

7
0
[0]
25
[0.10]
75
[0.30]
50
[0.20]
100
[0.40]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
10
[353]
15
[530]
20
[706]
10
[353]
15
[530]
20
[706]
10
[353]
15
[530]
20
[706]
10
[353]
15
[530]
20
[706]
Airflow rate (m3/min)[cfm]
10
[353]
15
[530]
20
[706]
10
[353]
15
[530]
20
[706]
50
[0.20]
75
[0.30]
125
[0.50]
100
[0.40]
150
[0.60]
Static pressure (Pa)[in.WG]
75
[0.30]
100
[0.40]
150
[0.60]
125
[0.50]
175
[0.70]
200
[0.80]
225
[0.90]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
0
[0]
25
[0.10]
75
[0.30]
50
[0.20]
100
[0.40]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
25
[0.10]
50
[0.20]
100
[0.40]
75
[0.30]
125
[0.50]
150
[0.60]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
75
[0.30]
100
[0.40]
150
[0.60]
125
[0.50]
175
[0.70]
200
[0.80]
225
[0.90]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
Low
Low
Low
Middle
Middle
Middle
High
High
High
Low
Low
Low
Middle
Middle Middle
High
High High
MVZ-A18AA4
• Vertical, Horizontal Right, Horizontal Left • Downflow
External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz
External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz
External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz
External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz
External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz
External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

8
0
[0]
25
[0.10]
75
[0.30]
50
[0.20]
100
[0.40]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
13
[459]
15
[530]
24
[847]
20
[706]
13
[459]
15
[530]
24
[847]
20
[706]
13
[459]
15
[530]
24
[847]
20
[706]
13
[459]
15
[530]
22
[777]
20
[706]
Airflow rate (m3/min)[cfm]
13
[459]
15
[530]
24
[847]
20
[706]
50
[0.20]
75
[0.30]
125
[0.50]
100
[0.40]
150
[0.60]
Static pressure (Pa)[in.WG]
13
[459]
15
[530]
22
[777]
20
[706]
75
[0.30]
100
[0.40]
150
[0.60]
125
[0.50]
175
[0.70]
200
[0.80]
225
[0.90]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
0
[0]
25
[0.10]
75
[0.30]
50
[0.20]
100
[0.40]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
25
[0.10]
50
[0.20]
100
[0.40]
75
[0.30]
125
[0.50]
150
[0.60]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
75
[0.30]
100
[0.40]
150
[0.60]
125
[0.50]
175
[0.70]
200
[0.80]
225
[0.90]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
Low
Low
Low
Middle Middle
Middle
High High
High
Low
Low Low
Middle
Middle Middle
High
High High
MVZ-A24AA4
• Vertical, Horizontal Right, Horizontal Left • Downflow
External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz
External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz
External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz
External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz
External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz
External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

9
0
[0]
25
[0.10]
75
[0.30]
50
[0.20]
100
[0.40]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
15
[530]
20
[706]
29
[1024]
25
[883]
15
[530]
20
[706]
29
[1024]
25
[883]
15
[530]
20
[706]
28
[989]
25
[883]
15
[530]
20
[706]
27
[953]
25
[883]
15
[530]
20
[706]
29
[1024]
25
[883]
15
[530]
20
[706]
29
[1024]
25
[883]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
75
[0.30]
100
[0.40]
150
[0.60]
125
[0.50]
175
[0.70]
200
[0.80]
225
[0.90]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
0
[0]
25
[0.10]
75
[0.30]
50
[0.20]
100
[0.40]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
25
[0.10]
50
[0.20]
100
[0.40]
75
[0.30]
125
[0.50]
150
[0.60]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
25
[0.10]
50
[0.20]
100
[0.40]
75
[0.30]
125
[0.50]
150
[0.60]
75
[0.30]
100
[0.40]
150
[0.60]
125
[0.50]
175
[0.70]
200
[0.80]
225
[0.90]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
Low Low
Low
Middle
Middle
Middle
High
High
High
Low
Low Low
Middle
Middle
Middle
High
High
High
MVZ-A30AA4
• Vertical, Horizontal Right, Horizontal Left • Downflow
External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz
External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz
External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz
External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz
External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz
External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

10
0
[0]
25
[0.10]
75
[0.30]
50
[0.20]
100
[0.40]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
19
[671]
25
[883]
20
[706]
33
[1165]
30
[1059]
19
[671]
25
[883]
20
[706]
32
[1130]
30
[1059]
19
[671]
25
[883]
20
[706]
32
[1130]
30
[1059]
Airflow rate (m3/min)[cfm]
19
[671]
25
[883]
20
[706]
32
[1130]
30
[1059]
19
[671]
25
[883]
20
[706]
32
[1130]
30
[1059]
50
[0.20]
75
[0.30]
125
[0.50]
100
[0.40]
150
[0.60]
Static pressure (Pa)[in.WG]
75
[0.30]
100
[0.40]
150
[0.60]
125
[0.50]
175
[0.70]
200
[0.80]
225
[0.90]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
25
[0.10]
50
[0.20]
100
[0.40]
75
[0.30]
125
[0.50]
175
[0.70]
150
[0.60]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
19
[671]
25
[883]
20
[706]
32
[1130]
30
[1059]
0
[0]
25
[0.10]
75
[0.30]
50
[0.20]
100
[0.40]
125
[0.50]
50
[0.20]
75
[0.30]
125
[0.50]
100
[0.40]
150
[0.60]
175
[0.70]
200
[0.80]
Airflow rate (m3/min)[cfm]
Static pressure (Pa)[in.WG]
Low
Low
Low
Middle
Middle
Middle
High
High
High
Low
Low Low
Middle
Middle Middle
High
High
High
MVZ-A36AA4
• Vertical, Horizontal Right, Horizontal Left • Downflow
External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz
External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz
External static pressure 0.60 [in.WG] (150Pa) 208/230V 60Hz
External static pressure 0.30 [in.WG] (75Pa) 208/230V 60Hz
External static pressure 0.50 [in.WG] (125Pa) 208/230V 60Hz
External static pressure 0.80 [in.WG] (200Pa) 208/230V 60Hz

11
Airflow rate (m3/min)[cfm]
External static pressure (Pa)[in.WG]
0
[0]
10
[353]
20
[706]
30
[1059]
40
[1412]
50
[1766]
MVZ-A12, 18, 24, 30, 36AA4
0
[0]
5
[0.020]
10
[0.040]
15
[0.060]
20
[0.080]
25
[0.100]
Power source:208/230V 60Hz
A
ir filter
A12,18,24
A12,18,24
A30,36
A30,36

12
SOUND PRESSURE LEVELS
5
5-1. Sound pressure level
Aux.duct
Front side
3-1/4ft.
(1m)
3-1/4ft.
(1m)
3-1/4ft.
(1m) 6-1/2ft.
(2m)
Aux.duct
Measurement location
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center requencies (Hz)
NC-20
NC-30
High
Middle Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500 1k
NC-60
NC-50
Approximate minimum
audible limit on
continuous noise
NC-40
Octav
NC-20
NC-30
High
Middle Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250
NC-60
NC-50
500 1k 2k
Approximate minimum
audible limit on
continuous noise
NC-40
Octave band center requencies (Hz)
NC-20
NC-30
High
Middle Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500 1k 2k 4k 8k
NC-60
NC-50
NC-40
Octave band center requencies (Hz)
NC-20
NC-30
High
Middle Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500
NC-60
NC-50
NC-40
Octave band center requencies (Hz)
NC-20
NC-30
High
Middle Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
63 125 250 500 1k 2k 4k 8k
NC-60
NC-50
NC-40
Octave band center requencies (Hz)
NC-20
NC-30
High
Middle Low
External static pressure 0.30 [in.WG] (75Pa) External static pressure 0.30 [in.WG] (75Pa)
External static pressure 0.50 [in.WG] (125Pa)
External static pressure 0.80 [in.WG] (200Pa)
External static pressure 0.50 [in.WG] (125Pa)
External static pressure 0.80 [in.WG] (200Pa)
kk8k
e band center requencies (Hz)
24
4k 8k
Approximate minimum
audible limit on
continuous noise
Approximate minimum
audible limit on
continuous noise
1k 2k 4k 8k
Approximate minimum
audible limit on
continuous noise
63 125 250 500 1k 2k 4k 8k
Ceiling concealed
5-2. NC curves
MVZ-A12AA4 MVZ-A18AA4

13
MVZ-A24AA4
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
v
NC-20
NC-30
High
Middle Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
Approximate mi imum
audible limit o
co ti uous oise
NC-40
NC-20
NC-30
High
Middle Low
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle Low
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle Low
00
5.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle Low
0.0
5.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle Low
Exter al static pressure 0.30 [i .WG] (75Pa) Exter al static pressure 0.30 [i .WG] (75Pa)
Exter al static pressure 0.50 [i .WG] (125Pa)
Exter al static pressure 0.80 [i .WG] (200Pa) Exter al static pressure 0.80 [i .WG] (200Pa)
Exter al static pressure 0.50 [i .WG] (125Pa)
4k 8k63 125 250 500 1k 2k 4k 8k
Octa e ba d ce ter freque cies (Hz)
125 250 500 1k 2k
Octave ba d ce ter freque cies (Hz)
36
Approximate mi imum
audible limit o
co ti uous oise
Approximate mi imum
audible limit o
co ti uous oise
63 125 250 500 1k 2k 4k 8k
Octave ba d ce ter freque cies (Hz)
10.010.0
63 125 250 500 1k 2k 4k 8k
Octave ba d ce ter freque cies (Hz)
Approximate mi imum
audible limit o
co ti uous oise
Approximate mi imum
audible limit o
co ti uous oise
63 125 250 500 1k 2k 4k 8k
Octave ba d ce ter freque cies (Hz)
63 125 250 500 1k 2k 4k 8k
Octave ba d ce ter freque cies (Hz)
10.0
Approximate mi imum
audible limit o
co ti uous oise
MVZ-A30AA4

14
MVZ-A36AA4
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle Low
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle Low
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
60.0
65.0
70.0
NC-60
NC-50
NC-40
NC-20
NC-30
High
Middle Low
External static ressure 0.30 [in.WG] (75Pa)
External static ressure 0.50 [in.WG] (125Pa)
External static ressure 0.80 [in.WG] (200Pa)
10.0
63 125 250 500 1k 2k 4k 8k
A roximate minimum
audible limit on
continuous noise
Octave band center frequencies (Hz)
10.0
63 125 250 500 1k 2k 4k 8k
A roximate minimum
audible limit on
continuous noise
Octave band center frequencies (Hz)
10.0
63 125 250 500 1k 2k 4k 8k
A roximate minimum
audible limit on
continuous noise
Octave band center frequencies (Hz)

15
6OUTLINES & DIMENSIONS
INDOOR UNIT
MVZ-A12, 18, 24, 30, 36AA4
Control box
Air filter
Air outlet
Air inlet
(Duct)
(Gravity drain)
Secondary drain pipe (Emergency draining) ø19.05(3/4) 3/4"FPT
(Gravity drain) (Horizontal left)
(Horizontal Right)
Secondary drain pipe (Emergency draining)
Primary drain pipe (Gravity drain) ø19.05(3/4) 3/4"FPT
Secondary drain pipe Primary drain pipe
ø19.05(3/4) 3/4"FPT
Primary drain pipe
ø19.05(3/4) 3/4"FPT
ø19.05(3/4) 3/4"FPT
(Emergency draining)
ø19.05(3/4) 3/4"FPT
Refrigerant piping
brazing connection(gas)
Refrigerant piping
brazing connection(liquid)
Terminal block (Indoor / Outdoor unit connection)
Terminal block (Remote controller transmission)
2-ø4.6 Burring Holes for electric heat installation
ø26 Knockout Hole
(Remote controller transmission)
ø26 Knockout Hole
ø26 Knockout Hole
ø26 Knockout Hole
(Indoor / Outdoor unit
connection)
(Indoor / Outdoor
unit connection)
(Remote controller
transmission)
Unit:mm(in.)
Model A B C D E F G H J Gas pipe Liquid pipe
MVZ-A12AA4 432
(17)
376
(14-13/16)
281
(11-1/8)
224
(8-7/8)
1275
(50-1/4)
680
(26-13/16)
823
(32-7/16)
735.5
(29)
360
(14-3/16)
ø
12.7
(1/2)
ø
6.35
(1/4)
MVZ-A18AA4 MVZ-A24AA4
ø
15.88
(5/8)
ø
9.52
(3/8)
MVZ-A30AA4 534
(21)
477
(18-13/16)
382.6
(15-1/8)
266.5
(10-1/2)
1378
(54-1/4)
737
(29-1/16)
953.5
(37-9/16)
792
(31-3/16)
461
(18-3/16)
MVZ-A36AA4
Top
Top
view
Front
Bottom
Bottom
view
view
Left side
view
Right side
view
Model
Nominal Filter Size Duct Connection
MVZ-A12AA4 508X406.4X25.4
(20X16X1)
376X402
(14-13/16X15-7/8)
MVZ-A18AA4 MVZ-A24AA4 MVZ-A30AA4 508X508X25.4
(20X20X1)
477X402
(18-13/16X15-7/8)
MVZ-A36AA4
J
77.8(3-1/8) 66(2-5/8)
525.5(20-3/4)
36.8(1-1/2)
50.8(2)
470(18-9/16)
H55(2-3/16)
G70(2-13/16)
43(1-3/4) 8(3/8) 92(3-5/8) 30(1-3/16)
8(3/8)
F
55(2-3/16)
43(1-3/4)
8(3/8)
D
55(2-3/16)
548(21-5/8)
117.4 (4-5/8)
402(15-7/8)
B(Duct) 28.8(1-3/16)
76(3)
C
E
A
24(15/16)
13.2(9/16)
Note 1.Keep the service space for maintenance at the front.
1
3
3
2
1 2

16
609.6(24)
Width of Unit
609.6(24)
Length of Unit
Clearance Area
Vertical Installation Horizontal Installation
Unit:mm(in.)

17
7WIRING DIAGRAM
MVZ-A12, 18, 24, 30, 36AA4
TO OUTDOOR UNIT
S3
S1
S2
RFI
11
2
CNXB1
CN2A
U
(BLUE)
TB15
CNXA2
t˚
TH2 TH5
TB4
CN2L
(BLUE)
(BLUE)
CN22
t˚
TH1
CN3C
2
LED3
(RED)
(RED)
(BLUE)
CNXA1 CNMFCNXC1
ON
OFF
LED2
LED1
DC280-340V
RECTIFIER CIRCUIT
(BLACK)
CN44
(RED)
ZNR01
CND
ZNR02
DSA
F01
CNXC2
CNXB2
CN51
CN41
CN105
CN90
CN20
SWE
X10
(RED)
U
FAN MOTOR
P. B .
I.B.
INSIDE SECTION OF CONTROL BOX
4
4123
3
2
4
51 2
2
1
3
4
1
5
3
1
2
1
153
2
1
4
3
1
2
12 321 17654
3~
MS
CNF
(GREEN)
CN24-1
(YELLOW)
CN24-2
(BLUE)
CN2C
(BLACK)
CNER
(RED) CN25
W.B.
1
2
3
4
5
6
7
8
9
t˚
OPTIONAL PARTS
TRANSMISSION
WIRES DC 12V
SW2
SW1
REMOTE CONTROLLER
R.B.
SW5
TB6
OPTIONAL PARTS
4
3
1
2
CN4F
CN32
4
5
3
2
1
ON
12345
SW2 SW2 SW2
ON
5
5
4
4
3
3
2
2
1
1
SW1
54321
SW1
ON
54321
SW1
ON
54321
54321687
SW5
ON
54321687
ON
54321687
SW5 SW5
Note1.Since the outdoor side electric wiring may change be sure
to check the outdoor unit electric wiring for servicing.
2.Indoor and outdoor connecting wires are made with
polarities,make wiring matching terminal numbers
(S1,S2,S3).
3.Symbols used in wiring diagram above are as follows.
:CONNECTOR
:TERMINAL
(HEAVY DOTTED LINE):FIELD WIRING
(THIN DOTTED LINE):OPTIONAL PARTS
4.Use copper supply wire.
UTILISER DES FILS D'ALIMENTATION EN CUIVRE.
SWITCH (FOR MODE SELECTION)
SW5
CONNECTOR (HEATER CONTROL 1ST)
CN2A
CONNECTOR (RADIO FREQUENCY INTERFACE)
INDOOR CONTROLLER BOARD
I.B.
CN105
SYMBOL EXPLANATION
CONNECTOR (WIRELESS)
FUSE AC250V 6.3A
CONNECTOR (CENTRALLY CONTROL)
CONNECTOR (HA TERMINAL-A)
LED(REMOTE CONTROLLER SUPPLY)
INDOOR CONTROLLER BOARD
CONNECTOR (REMOTE SWITCH)
LED(TRANSMISSION INDOOR-OUTDOOR)
F01
CN41
CN51
CN2L
NAME
SW1
SW2
CN32
I.B.
SYMBOL SYMBOL NAME
SWE
TH1 INTAKE AIR TEMP. THERMISTOR
TH2 PIPE TEMP
. THERMISTOR/LIQUID
TH5 COND
. /EVA . TEMP . THERMISTOR
LED1
LED2
LED3
CONNECTOR (LOSSNAY)
LED(POWER SUPPLY)
NAMESYMBOL
TERMINAL BLOCK
(REMOTE CONTROLLER TRANSMISSION LINE)
TERMINAL BLOCK
(INDOOR/OUTDOOR CONNECTING LINE)
TB4
TB15
P. B .
POWER SUPPLY BOARD
VARISTOR
ZNR01,02
CN90
SWITCH (FOR MODEL SELECTION)
SWITCH (FOR CAPACITY CODE)
CONNECTOR (EMERGENCY OPERATION)
RADIO FREQUENCY INTERFACE FOR RF THERMOSTAT
RFI
TERMINAL BLOCK
(REMOTE CONTROLLER TRANSMISSION LINE)
TB6
WIRED REMOTE CONTROLLER BOARD
R.B.
SW2
SWITCH(COOLING ON/OFF)
SWITCH(HEATING ON/OFF)
SW1
IR WIRELESS REMOTE CONTROLLER BOARD
LED(RUN INDICATOR)
BUZZER
OPTIONAL PARTS
LED1
BZ1
RECEIVING UNIT
RU
W.B.
CN24-1
CN24-2
CONNECTOR (HEATER CONTROL 2ND)
CONNECTOR (0-10V ANALOG INPUT)
CN25
CONNECTOR (HUMIDITY OUTPUT)
CN2C
CONNECTOR (ERV OUTPUT)
CONNECTOR (ERV INPUT)
CNER
CNF
CONNECTOR (HUMIDITY INPUT)
ON
SW2 SW2
ON
ON
5
5
4
4
3
3
2
2
1
1
SW1
ON
54321
MODEL
MVZ-A12AA4
MVZ-A18AA4
MVZ-A24AA4
MVZ-A30AA4
MVZ-A36AA4
SW1
ON
54321
ON
ON
54321687
SW5
ON
54321687
ON
SW5
SWITCH
DSA
X10
ARRESTOR
AUX.RELAY
RU
BZ1
CN1
123456789
SW2SW1
LED1

18
8REFRIGERANT SYSTEM DIAGRAM
MVZ-A12, 18, 24, 30, 36AA4
Thermistor TH2
Pipe temperature(Liquid)
Distributor
with strainer (#50)
Thermistor TH5
(Cond./ Eva.temperature)
Thermistor TH1
(Room temperature)
Refrigerant flow in cooling
Refrigerant flow in heating
Strainer (#50)
Strainer (#50)
Heat exchanger Refrigerant GAS pipe connection
(Flare)
Refrigerant LIQUID pipe connection
(Flare)