Carrier 30AWH004HB / 30AWH006HB / 30AWH008HB / 30AWH012HB. Service Manual - page 7

97

30AW

 

   Carrier 

interfaces

7

108

ALARM-DEFROST OR 

HUMIDITY 

SELECTION

This code is use to select the output connected at PIN 11 on 
terminal strip:
1. Unit alarms and/or Defrost
2. Humidity Control

1

2

2

109

FROST DELTA     

SET-POINT

This code is use to set the frost delta set-point used by the Anti 
frost protection logic as per algorithm.

0°C

6°C

1°C

110

RESET COMPRESSOR    

RUN-TIME

This code is use to reset the compressor timer to zero.

No

yes

No

111 

(

)

FLOW SWITCH STATUS

This code displayes the Flow Switch status:
0. Water not flowing                                                                      
1. Water flowing   

-

-

-

112

HEAT CLIMATIC 

CURVE NUMBER

This code is use to select the heat climatic curve number:
0. No predefined climatic curve (Installer has to draw CC)
1 - 12. Refers to NUI manuals for climatic curve details.

0

12

0

113

HEAT WATER      

SET-POINT

This code is use to set the fixed heating water set-point.

20°C

60°C

45°C

114

ECO HEAT 

TEMPERATURE  

REDUCTION

This code is use to set the temperature reduction value for fixed 
heating water set-point when the unit is in ECO mode.

1°C

20°C

5°C

115

COOL WATER     

 SET-POINT

This code is use to set the fixed cooling water set-point.

4°C

25°C

7°C

116

ECO COOL 

TEMPERATURE  

REDUCTION

This code is use to set the temperature reduction value for fixed 
cooling water set-point when the unit is in ECO mode.

1°C

10°C

5°C

117

COOL CLIMATIC 

NUMBER

This code is use to select the cool climatic curve number:
0. No predefined climatic curve (Installer has to draw CC)
1 - 2. Refers to NUI manuals for climatic curve details

0

2

0

118

MIN OUTDOOR 

AIR TEMPERATURE 

HEATING

This code is use to select the minimum outdoor temperature of 
the heating climatic curve, depending on the country where the 
system is installed. 

-20°C

+10°C

-7°C

119

MAX OUTDOOR 

AIR TEMPERATURE 

HEATING

This code is use to select the maximum outdoor temperature of 
the heating climatic curve.

10°C

30°C

20°C

120

MIN WATER TEMPERA-

TURE HEATING

This code is use to select the minimum water temperature of the 
heating climatic curve.

20°C

60°C

40°C

121

MAX WATER TEMPERA-

TURE HEATING

This code is use to select the maximum water temperature of the 
heating climatic curve.

20°C

60°C

55°C

122

MAX OUTDOOR 

AIR TEMPERATURE 

COOLING

This code is use to select the maximum outdoor temperature of 
the cooling climatic curve, depending on the country where the 
system is installed. 

24°C

46°c

40°C

123

MIN OUTDOOR AIR 

TEMPERATURE CO-

OLING

This code is use to select the minimum outdoor temperature of 
the cooling climatic curve

0°C

30°C

22°C

124

MIN WATER TEMPERA-

TURE COOLING

This code is use to select the minimum water temperature of the 
cooling climatic curve.

4°C

20°C

4°C

125

MAX WATER TEMPERA-

TURE COOLING

This code is use to select the maximum water temperature of the 
cooling climatic curve.

4°C

20°C

12°C

126

GMC OAT THERMISTOR

This code is use to define if GMC OAT thermistor is installed or n
ot:                                                                                           
1. GMC thermistor installed
2. GMC thermistor not installed

1

2

2

127 

(

)

TO SENSOR VALUE

This code displayes the outdoor air temperature value read by 
the TO sensor.

-

-

-

128 

(

)

TE SENSOR VALUE

This code displayes the refrigerant temperature value read by the 
TE sensor.

-

-

-

129 

(

)

TS SENSOR VALUE

This code displayes the suction temperature value read by the 
TS sensor.

-

-

-

130 

(

)

TD SENSOR VALUE

This code displayes the discharge temperature value read by the 
TD sensor.

-

-

-

131 

(

)

CDU MODE

This code displayes the actual Heat Pump operating mode:

0ò

2.     Cool
3.     Heat 
4.     Fail
5.     Defrost

-

-

-

132 

(

)

MAX COMPRESSOR 

FREQUENCY

This code displayes the maximum compressor frequency calcula-
ted by GMC control board. 

-

-

-

133 

(

)

REQUESTED 

FREQUENCY

This code displays the requested frequency by the system 
control.

-

-

-

Code Nr.

Name 

DESCRIPTION

VALUE RANGE

STANDARD

Min

Max

14-03-2011   14:46:20

98

30AW

 

   Carrier 

interfaces

7

134 

(

)

REAL FREQUENCY

This code displays the real compressor frequency

-

-

-

135 

(

)

COMPRESSOR

 RUNTIME

This code displays the working on hours of the compressor..

-

-

-

136 

(

)

CDU CAPACITY

This code displays the nominal heat pump capacity [kW].

-

-

-

137 

(

)

EWT SENSOR VALUE

This code displays the Entering Water Temperature read by the 
EWT sensor.

-

-

-

138 

(

)

LWT SENSOR VALUE

This code displays the Leaving Water Temperature read by the 
LWT sensor.

-

-

-

139 

(

)

TR SENSOR VALUE

This code displays the refrigerant temperature value read by the 
TR sensor.

-

-

-

140 

(

)

SYSTEM MODE

This code displayes the operating mode requested by the System 
Control:

0ò

1.     Stand by
2.     Cooling
3.     Heating
4.     N.A.
5.     N.A.
6.     Rating Heating
7.     Rating Cooling
8.     Freeze Protection 
9.     Defrost 
10.  High Temperature Protection  
11.  Timeguard
12.  System Fail

-

-

-

141 

(

)

DEF MODULE

This code displays the list of the all fault codes detected by the 
outdoor unit. If no fault are occurring, no codes will be displayed.

-

-

-

142 

(

)

GMC SOFTWARE 

VERSION

This code displays the GMC Software Version

-

-

-

143 

(

)

GMC SOFTWARE 

RELEASE

This code displays the GMC Software Release

-

-

-

144 

(

)

WATER PUMP 

RUNTIME

This code displays the working on hours of the water pump.

-

-

-

145 

(

)

CURRENT WATER SET-

POINT

This code displays the current water set-point defined by the 
system control.

-

-

-

146

DRY CONTACT OFF

5IJTDPEFJTVTFUPTFUUIFEJòFSFOU0''MPHJDT

1. Standard OFF

$POUSPMMFE0ò$ZDMF POMZJG)1JTDPOUSPMMFECZESZDPOUBDU

1

2

1

147

ALARM / SATISFIED AIR 

ROOM 

TEMPERATURE

This code is use to select the output connected at PIN 5 on 
terminal strip:
1. Alarm signal
2. Signal of reached air temperature set-point

1

2

1

148

EXTERNAL HEAT 

SOURCE OAT LIMIT

This code is use to set the OAT threshold value under which only 
the external heat source will be operative as per algorithm. (Stop 
HP) 

-20°C

65°C

-20°C

149

TEMPERATURE LIST

This code is use to set which temperature the NUI shall display in 
temperature zone.
1. Indoor air temperature 
2. Leaving water temperature (from LWT sensor)
3. Entering water temperature (from EWT sensor)
4. Refrigerant temperature (from TR sensor)
5. Suction temperature (from TS sensor)
6. Discharge temperature (from TD sensor)
7. Refrigerant temperature (from TE sensor)

1

7

1

150

AUXILIARY OAT LIMIT

This code is use to set the OAT threshold value under which both 
the heat pump and the external heat source will be operative as 
per algorithm.

-20°C

30°C

0°C

151

AUXILIARY DELAY

This code is use to set the delay time after which, when (tempe-
rature set in code 148) < OAT < (temperature set in code 150), 
the external heat source will switch on . The counting of the time 
starts when the activation of the EHS is required as per algorithm 
(if (current water temperature) < (water temperature set-point – 
auxiliary hysteresis)

1 Min

60 Min

10 Min

152

AUXILIARY 

HYSTERESIS

This code is use to set the hysteresis temperature needed to 
activate the external heat source..

1°C

20°C

5°C

153

SANITARY HOT 

WATER IN OFF MODE

5IJTDPEFJTVTFUPEFöOFJGXIFOTZTUFNNPEFJTPòUIFTBOJUBSZ

hot water logic can be activated:
1. Yes, SHW logic is always actives 
2. No, SHW logic can be activated only in Heat or Cool mode

1

2

1

Code Nr.

Name 

DESCRIPTION

VALUE RANGE

STANDARD

Min

Max

14-03-2011   14:46:21

99

30AW

 

   Carrier 

interfaces

7

154

EXTERNAL HEAT 
SOURCE STATUS

This code is use to define the external heat source status when 
EHS is activated and OAT < temperature value set in Code 148:
0. Always On

0O0òEFQFOEJOHCZBDUVBM3PPN5FNQFSBUVSFWTSPPNUFN

-

perature set-point(same hysteresis of Thermostat function). In

DBTFPG/6*JTOPUJOTUBMMFEPSSPPNTFOTPSVOBWBJMBCMF0O0ò

depending by water set-point (+1/-4 °C of hysteresis)

0O0òEFQFOEJOHCZXBUFSTFUQPJOU ¡$PGIZTUFSFTJT

0

2

1

155

MAIN WATER PUMP 

LOGIC VS EHS STATUS

This code is use to define the water pump logic when EHS is 
activated and OAT < (temperature value set in Code 148):

"MXBZT0ò
0O0òEFQFOEJOHCZ&)40O0òTUBUVT

2. Always On

0

2

1

156

TRACE HEATER / ADDI-

TIONAL WP LOGIC

This code is use to select the output connected at PIN 11 on 
terminal strip. In case an additional water pump option is active, 
this code is use to select its operating logic vs the SHW request (if 
OAT > (temperature value set in Code 148)).  
0. Trace he

"EEJUJPOBMXBUFSQVNQ0O0òEFQFOEJOHCZNBJOXBUFS

pump logic. This it means that in case of SHW activation, the 
additional WP will be ON.

"EEJUJPOBMXBUFSQVNQ0O0òEFQFOEJOHCZNBJOXBUFS

pump logic, but always OFF when SHW is activated.

0

2

1

157

ADDITIONAL WATER 

PUMP LOGIC

This code is use to define the additional water pump logic, if it 
has been installed, when OAT < temperature value set in Code 
148:

"MXBZT0ò
0O0òEFQFOEJOHCZ&)40O0òTUBUVT

2. Always On

0

2

2

158

DELTA AIR          

SET-POINT

This code is use to define the hysteresis versus the temperature 

SPPN4FU1PJOUUP0òUIF6OJUXIFOUIF4ZTUFN5ZQFJT/6*

installed and used as Thermostat (100 NUI code = 4).  

0.2°C

1°C

0.3 °C

302

UNIT CONFIGURATION

This code is use to configure the unit:                                              0. 
Cooling Only 
1. Heat & Cooling 
2. Heating Only 

0

2

1

7.3.5 Climatic curves

Pre-set curves

 
Twelve heating curves and two cooling curves are available by accessing 

to parameters 112 and 117 respectively of installer configuration table. 

The curves are set to maintain a target indoor temperature of 20°C. 

Code Nr.

Name 

DESCRIPTION

VALUE RANGE

STANDARD

Min

Max

14-03-2011   14:46:23

100

30AW

 

   Carrier 

interfaces

7

 

 

14-03-2011   14:46:25

101

30AW

 

   Carrier 

interfaces

7

 

1. CODE 

N° 

121 

2. CODE 

N° 

120 

3. CODE 

N° 

118 

4. CODE 

N° 

119 

 

5.  CODE N° 125 
6.  CODE N° 124 
7.  CODE N° 123 
8.  CODE N° 122 

NOTE:

 In case application requires fixed water set point in necessary to set an horizontal climatic curve by setting NUI code120=121 for Heating Climatic 

Curve and 124=125 for Cooling Climatic Curve.

Custom curves

 

Parameters 112 and 117 set to 0 allows to load in the control a custom 
climatic curve.
Below figures show which parameter of installer configuration table 

need to be set to create customized heating and cooling curves. 

14-03-2011   14:46:26

102

30AW

 

    Maintenance

8

8.1 Refrigerant charge check

8.2 Cleaning the coil

This check becomes necessary after any refrigerant leak or after 
replacement of the compressor.
The best method to correctly charge refrigerant is to completely empty 
the refrigerant circuit using refrigerant recovery equipment.
Then charge the exact quantity of refrigerant according to the data 
shown on the unit nameplate.
R-410A systems must be charged with liquid refrigerant.
Use the special recharging equipment (normally on the market) to 
control the refrigerant correctly.
When it is necessary to recharge refrigerant, charge the specified 
amount of new refrigerant according to the following steps:

1. Recover the refrigerant, and check no refrigerant remains in the 

equipment.

2. Connect the charge hose to packed valve service port (see the 

Check joint in the figure illustrated in chapter 3.4 Refrigerant 
schematics).

3. Connect the charge hose of the vacuum pump adapter.
4. Place the handle of the gauge manifold Low in the fully opened 

position, and turn on the vacuum pump’s power switch. Then, 
evacuating the refrigerant in the cycle.

5. When the compound gauge’s pointer has indicated -0.1 MPa              

( - 76 cmHg ), place the handle Low in the fully closed position, and 

UVSOPòUIFWBDVVNQVNQTQPXFSTXJUDI

6. Keep the status set as it is for 1 to 2 minutes, and ensure that the 

compound gauge’s pointer does not return.

7. Set the refrigerant cylinder to the electronic balance, connect the 

connecting hose to the cylinder and the connecting port of the 
electronic balance, and charge liquid refrigerant.

If necessary, proceed as follows for more careful cleaning of the coil:
- Switch the mains supply OFF.
- Remove unit top cover by losening the fixing screws and lifting 

thecover. Carefully clean the coil with a vacuum cleaner from inside to 
outside.  

IMPORTANT: 

All maintenance operations must be performed by qualified personnel.

IMPORTANT:

- Never charge refrigerant exceeding the specified amount.
- If the specified amount of refrigerant cannot be charged, charge 

refrigerant bit by bit in COOL mode.

- Do not carry out additional charging. When additional charging is 

carried out if refrigerant leaks, the refrigerant composition changes 
in the refrigeration cycle, that is characteristics of the heat pump 
changes, refrigerant exceeding the specified amount is charged, and 
working pressure in the refrigeration cycle becomes abnormally high 
pressure, and may cause a rupture or personal injury.

- A cylinder with siphon enables liquid to be charged without the 

cylinder turned upside down.(see the figure below)

With the same vacuum cleaner, remove the dust from inside the fan 
compartment and the fan blades. Avoid any damage to the blades 
which may cause future vibrations and noise.

Replace the unit cover and tighten the screws.

14-03-2011   14:46:27

103

30AW

N°

Exchange
parts
name

Work procedure (IMPORTANT: Ensure gloves are 
worn at all times to avoid risk of injury)

Remarks

30 AWH 004, 30 AWH 006, 30 AWH 008

(1)

Common 
procedure

t

 Detachment

 

4UPQPQFSBUJPOPGUIFIFBUQVNQBOEUVSOPò

switch of the breaker.

3FNPWFUIFGSPOUQBOFM 451tQDT

After unscrewing the screws, remove the front 
panel while drawing it downward.

3. Remove the power cable from cord clamp and  

terminal.

3FNPWFUIFSPPGQMBUF 451tQDT

t

Attachment

.PVOUUIFSPPGQMBUF 451tQDT

6. Connect the power cable and to terminal, and 

then fix them with cord clamp.

REQUIREMENT  

Secure the power cables using a tie-wrap or rub-
ber band to ensure they do not come into contact 
with  the compressor, valves and discharge pipe.

"UUBDIUIFGSPOUQBOFM 451tQDT

(2)

Side 
cabinet

t

Detachment

1. Perform the work from 1 to 4 of (1).
2. Remove the screws fixing the inverter assembly 

BOEUIFTJEFDBCJOFU .tQD

3. Remove the screws fixing the GMC assembly and  

UIFTJEFDBCJOFU 451tQDT

4. Remove the screw for the side cabinet and the 

QJQJOHQBOFM 3FBS 451tQD

5. Remove the screw for the side cabinet and the 

CBTFQMBUF 451tQDT

6. Remove the screws for the side cabinet and heat   

FYDIBOHFS 451tQDT

7. Remove the screws of the side cabinet and the 

Brazzed plate heat exchanger assembly.  (ST8P 

tQDT

t

Attachment

8. Replace the cabinet removed and attach the 

UBLFOPòTDSFXTUPUIFPSJHJOBMQPTJUJPOT

(3)

Air-outlet 
cabinet

t

 Detachment

1. Perform the work from 1 to 4 of (1).
2. Remove the screws for the air-outlet cabinet and 

UIFQBSUJUJPOQMBUF 451tQDT

3. Remove the screws for the air-outlet cabinet and 

UIFCBTFQMBUF 451tQDT

4. Remove the screws for the air-outlet cabinet and 

UIFIFBUFYDIBOHFS .tQD

t"UUBDINFOU

5. Replace the cabinet removed and attach the 

UBLFOPòTDSFXTUPUIFPSJHJOBMQPTJUJPOT

 

    Maintenance

8

8.3 Replacement of the main parts

Heat exchanger

Motor fan

Air outlet cabinet

Gloves

Front panel

Roof plate

Inverter assembly

GMC assembly

Side cabinet

14-03-2011   14:46:29

104

30AW

 

    Maintenance

8

N°

Exchange
parts
name

Work procedure (IMPORTANT: Ensure gloves are 
worn at all times to avoid risk of injury)

Remarks

(4)

Inverter 
assembly

1. Perform the works from 1 to 4 of (1) and (2) .

WARNING

'PSNJOVUFBGUFSUIFQPXFSJTUVSOFEPòEPOPU

disassemble the inverter to prevent an electric shock. 
Perform discharging by connecting the discharging 
resistance or plug of soldering iron to + , – terminals 
of the C10 too 13 electrolytic capacitor (760μF) of 
P.C. board. 
Never use a screwdriver or similar device to di-
scharge the electrolytic capacitor components as a 
electric shock may occur.
Under system fault condition, the electrolytic capa-
citor components may not have discharged. Ensure 
these are discharged before proceeding.

2. Remove the inverter cover to gain access to 
inspect the P.C.Board

5BLFPòTDSFXT 451tQDTöYJOHUIF

main body and the inverter box.
4. Remove various lead wires from the holder at 
upper part of the inverter box and wiring holder at 
right side of the terminal block.
5. Remove the lead wire from the bundled part at left 
side of the terminal block. 
6. Pull the inverter box upward. 
7. Disconnect connectors of various lead wires.

REQUIREMENT

 As each connector has a lock mechanism, avoid to 
remove the connector by holding the lead wire, but 
by holding the connector.

(5)

Control 
P.C. board
assembly

t%JTDPOOFDUMFBEXJSFTBOEDPOOFDUPSTDPOOFDUFE

from the control P.C. board assembly to other parts

1. Lead wires Connection with the power terminal 
block: 3 wires (Black, White, Orange) Earth wire: 1 
wire (Black)
2. Connectors
Connection with compressor: Remove 3P connector.
Connection with reactor: Remove the relay connec-
tors from P08, P11 and P31,P30.CN500: 
TE sensor (2P)CN501: 
TD sensor (3P)
CN502: TO sensor (2P)
CN503: TS sensor (3P)
CN300: Outdoor fan (3P)
CN500: Case thermo. (2P)
CN701: 4-way valve (3P)
CN700: PMV (Pulse Motor Valve) 

REQUIREMENT

As each connector has a lock mechanism, avoid to
remove the connector by holding the lead wire, but
by holding the connector.

$VUPòUJFMBQXIJDIöYFTWBSJPVTMFBEXJSFTUPUIF

inverter assembly. 

5BLFPòUIFTDSFXTöYJOHUIF1$CPBSEBOEUIF

base. 

5BLFPòTDSFXTöYJOHUIFIFBUTJOLBOENBJO

control board assembly side, and replace the board
with a new one.
Caution: When mounting a new board, check that 
the board is correctly set in the groove of the base 
holder of P.C. board base. Attach the P.C. board so
that the heat sink comes securely contact with the 
metal sheet.

t.PVOUUIFJOWFSUFSBTTFNCMZ

Caution

: 

Mount the inverter assembly to the partition plate so 
that hooks of the heat sink cover do not come near 
the partition plate but also near the fan side.

t"UUBDIUIFSFNPWFEDPOOFDUPSTBUUIF1$CPBSE
BOEBUUBDIUIFUBLFOPòTDSFXTUPUIFPSJHJOBM

positions.

Inverter cover

P.C. Board

Inverter assembly

Heat sink

Different lock mechanisms of different inverter board connectors

Control P.C. board assembly

heat sink

Fixed Screws

P.C. Board

Fixed Screws

Heat sink

Terminal block

k

T

Scc

S

S

S

S

14-03-2011   14:46:32

105

30AW

 

    Maintenance

8

N°

Exchange
parts
name

Work procedure (IMPORTANT: Ensure gloves are 
worn at all times to avoid risk of injury)

Remarks

(6)

Reactors

1. Perform the works from 1 to 4 of (1) and (2).
2. Remove the inverter assembly item (4).
3. Remove the reactors’ connectors. 

5BLFPòUIFTDSFXT 451tQDTöYJOH

the reactor to the partition plate.

5. Pull the reactor upward and detach it from the 

partition plate. 

6. Replace the fail reactor with a new one.

(7)

GMC 
Board 
assembly

1. Perform the works from 1 to 4 of (1).

5BLFPòUIFTDSFXT 455Y-QDTöYJOHUIF

GMC cover and remove it gain access to inspect the
board.

3. Disconnect lead wires and connectors connected

from the GMC board assembly to other parts.
J6A Water Enter Exchanger Sensor
J6B TR Sensor
J6C Water Exit Exchanger Sensor
J22 Outdoor Air Sensor
J18 Mode (Heat/Cool)
J5 Remote Control
J20 Eco / Antifreeze Switch
J8 Communications Receive
J16 ON/OFF and Power limitation Switch
J20 Sanitary Water Dry contact 
J4 Water Exchanger and 3 way valve
J7 Water pump Speed – Defrost and TFC status – EHS 
and Dehumidifier
J11 Alarm status and Defrost signal
REQUIREMENT
As each connector has a lock mechanism, avoid to 
remove the connector by holding the lead wire, but 
by holding the connector.
4. Pull the GMC assembly upward and detach it from 
the partition plate. The GMC board is attach to the 
partition plate by two hooks.
5. Remove 4 hooking claws of GMC board base and 
pull the GMC board upward. 

6. Replace the fail GMC board with a new one.

Caution: When mounting a new board, check that 
the board is correctly set in the groove of the base 
holder of GMC board base.

7. Attach the removed connectors at the GMC board 

BOEBUUBDIUIFUBLFOPòTDSFXTUPUIFPSJHJOBM

positions.

(8)

Fan motor

1. Perform the works from 1 to 4 of (1) and (3).

5BLFPòUIFøBOHFOVUöYJOHUIFGBONPUPSBOEUIF

propeller. Lose the flange nut by turning clockwise. 
(To tighten the flange nut, turn counter-clockwise.)

3. Remove the propeller fan.
4. Disconnect the connector for fan motor from the 

inverter.

5BLFPòUIFöYJOHTDSFXT 451YQDT

holding by hands so that the fan motor does not fall.

6. Replace the fail fan motor with a new one.

Caution:

Be sure that the propeller fan does not come to 
contact with the fan motor lead.

Connector

Screws

Reactors

Hooks

GMC cover

GMC board

Flange nut

Propeller

Expansion vessel

Fan motor

14-03-2011   14:46:34

106

30AW

 

    Maintenance

8

N°

Exchange
parts
name

Work procedure (IMPORTANT: Ensure gloves are 
worn at all times to avoid risk of injury)

Remarks

(9)

Compressor

Perform the works from 1 to 4 of (1) and (2), (3), (4), 
(6), (7).
1. Discharge refrigerant gas.

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also the nut fixing the liquid receiver and the parti-
tion plate.

4. Remove the noise-insulator.
5. Remove the terminal covers of the compressor, and 

disconnect lead wires of the compressor and the 
compressor thermo assembly from the terminal.

6. Remove pipes connected to the compressor with a 

burner.

CAUTION

Ensure flames of burner do not damage 4-way valve 
or PMV. (If doing so, a malfunction may be caused.)

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8. Pull upward the refrigerating cycle.

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place.

CAUTION

When reconnecting the lead wires to the 
compressor terminals after replacement of the
compressor, be sure to caulk the Faston terminal 
without loosening.

10. Draw out the compressor toward you

(10)

Liquid 
receiver

1. Perform the works from 1 to 4 of (1) and (2), (3), (4), 

(6), (7).

2. Discharge refrigerant gas.
3. Remove the nut fixing the liquid receiver and the 

partition plate.

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5. Remove pipes connected to the liquid receiver with 

a burner.

CAUTION

Ensure flames of burner do not damage other com-
ponents. (If doing so, a malfunction may be caused.)

Piping panel

Screws

Partition plate

Liquid receiver nut

4-way valve

Compressor

Noise-insulator

Terminal cover

Noise-insulator

Liquid receiver

4 way valve

Partition plate

PMV

14-03-2011   14:46:36

107

30AW

 

    Maintenance

8

N°

Exchange
parts
name

Work procedure (IMPORTANT: Ensure gloves are 
worn at all times to avoid risk of injury)

Remarks

(11)

Pulse
modula-
ting
valve 
(PMV)
coil

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1. Perform the works from 1 to 4 of (1) and (3).
2. Hold outside of the coil by hands and turn it while 

lifting upward.

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then the coil can be removed from PMV body.

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4. Match the positioning extrusion of the coil surely to 

the concave part of PMV body, and then fix it.

(12)

Fan guard

t

 Detachment

1. Perform works from 1 to 4 of (1) and (3).
2. Remove the front cabinet, and put it down so that 

fan guard side directs downward.
Caution: Perform works on a corrugated cardboard, 
cloth, etc. to prevent flaw on the product.

3. Remove the screws fixing the bell-mouth (ST8P Ø8.2 

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4. Remove the bell-mouth.
5. Remove the screws fixing the fan guard (ST8P Ø8.2 

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6. Remove hanging hook of the fan guard by pushing 

with a minus screwdriver.

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7. Fix the hanging hooks by pushing with hands.

REQUIREMENT

PMV Coil

Bell-mouth

Screw

Screw

Hanging Hooks

h

w

w

14-03-2011   14:46:38

108

30AW

 

    Maintenance

8

N°

Exchange
parts
name

Work procedure (IMPORTANT: Ensure gloves are 
worn at all times to avoid risk of injury)

Remarks

Water 
circuit

CAUTION:

To replace a water circuit part, first close the water 
supply source valve and the valve of water pipe 
connected to the unit.

(13)

Expansion 
vessel 
(Only H 
versions)

1. Perform works from 1 to 4 of (1) and (3).
2. Remove the fixed band of the expansion vessel. 

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3. Remove the expansion vessel connection (flare nut).
4. Replace the packing to new one when installing the 

expansion vessel.

IMPORTANT:
After the expansion vessel replacement repair,
open the water supply source valve and water
piping valve to pass water through the hydro unit, and 
check that the expansion vessel connection has no 
water leakage.

(14)

Relief 
valve

1. Perform works from 1 to 4 of (1) and (2).
2. Remove the piping panel.
3. Remove the relief valve.

CAUTION:
The relief valve connection uses an O ring for water 

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water leakage may occur.
IMPORTANT:
After the relief valve replacement repair, open the 
water supply source valve and water piping valve to 
pass water through the hydro unit, and check that 
the relief valve connection has no water leakage.

Exiting water

Water Drain

Entering water

Water pump motor

Relief valve

BPHE

Water Pump

Flow switch

Automatic purge valve

Relief valve

Expansion vessel

Screw

Nut

Fixed band

on vessel

14-03-2011   14:46:40

109

30AW

 

    Maintenance

8

N°

Exchange
parts
name

Work procedure (IMPORTANT: Ensure gloves are 
worn at all times to avoid risk of injury)

Remarks

(15)

Automatic 
purge 
valve

1. Perform works from 1 to 4 of (1) and (2).
2. Remove the automatic purge valve.

IMPORTANT
After the automatic purge valve replacement repair, 
open the water supply source valve and water 
piping valve to pass water through the hydro unit, 
and check that the air vent valve connection has no 
water leakage.

(16)

Flow 
switch

1. Perform works from 1 to 4 of (1) and (2).
2. Remove the relative connector
3. Remove the flow switch.

CAUTION:
The flow switch connection uses an O ring for water 

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water leakage may occur.
Place a flow sensor parallel to the water heat 
exchanger inlet pipe so that the wire is place on the 
right side from the front view.

(17)

Water 
heat
exchanger 
(BPHE)

1. Perform works from 1 to 4 of (1) and (2).
2. Disconnect all the power source cable and cylinder 

connection cable.

3. Discharge refrigerant gas.

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the water circuit

5. Remove refrigerant pipes connected to the com-

pressor with a burner.
CAUTION
Ensure flames of burner do not damage PMV. (If 
doing so, a malfunction may be caused.)

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the heat exchanger cover.

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IMPORTANT:
After the water heat exchanger replacement repair, 
open the water supply source valve and water 
piping source valve to pass water through the hydro 
unit, and check that the connection has no water 
leakage.
After connecting the refrigerant pipe, check that the 
connection has no refrigerant leakage.

(18)

TWI 
sensor
TR sensor
TWO 
sensor

1. Perform works from 1 to 4 of (1) and (2).
2. Take the sensors out.

Flow switch

Automatic purge 

valve

BPHE

PMV

Nut

Heat exchanger cover

E

r

14-03-2011   14:46:41

110

30AW

 

    Maintenance

8

N°

Exchange
parts
name

Work procedure (IMPORTANT: Ensure gloves are 
worn at all times to avoid risk of injury)

Remarks

(19)

Pump
(Only H 
versions)

1. Perform works from 1 to 4 of (1) and (2).
2. Remove the relative connectors
3. Remove the 2 nuts of the heater connection and the 

lower side of the pump.

4. Remove the pump pulling it out.

CAUTION:

The pump connection uses a liquid packing for
water seal. When replacing the pump, use a
packing which was slathered with the liquid gasket.

IMPORTANT:

After the pump replacement repair, open the water 
supply source valve and water piping valve to pass 
water through the hydro unit, and check that the 
pump connection has no water leakage.

30 AWH 012, 30 AWH 015

(1)

Common 
procedure

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switch of the breaker.

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    After unscrewing the screws, remove the front
    panel while drawing it downward.
3. Remove the power cable from cord clamp and 

terminal.

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9. Connect the power cable and to terminal, and then 

fix them with cord clamp.
REQUIREMENT
Secure the power cables using a tie-wrap or rubber 
band to ensure they do not come into contact with 
the compressor, valves and discharge pipe.

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(2)

Side 
cabinet

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1. Perform the work from 1 to 4 of (1).
2. Remove the screws fixing the inverter assembly and 

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9.5, 1 pc.).

3. Remove the screws fixing the GMC assembly and 

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4. Remove the screw for the side cabinet and the 

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5. Remove the screw for the side cabinet and the base 

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6. Remove the screws for the side cabinet and the fin 

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7. Remove the screws of the side cabinet and the 

Brazzed plate heat exchanger assembly. (ST8P Ø9.75 

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8. Replace the cabinet removed and attach the taken-

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Pump  motor                                                   

                                                 

                                               

Nuts                                                

Gloves

Gloves

Roof plate     

Side cabinet

Front panel

                                       

   

14-03-2011   14:46:44

111

30AW

 

    Maintenance

8

N°

Exchange
parts
name

Work procedure (IMPORTANT: Ensure gloves are 
worn at all times to avoid risk of injury)

Remarks

(3)

Air-outlet 
cabinet

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1. Perform the work from 1 to 4 of (1).
2. Remove the screws for the air-outlet cabinet and 

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3. Remove the screws for the air-outlet cabinet and 

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4. Remove the screws for the air-outlet cabinet and 

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5. Remove the screw for the air-outlet cabinet and the 

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6. Replace the cabinet removed and attach the taken-

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(4)

Inverter 
assembly
(012)

1. Perform the works from 1 to 4 of (1) and (3) .

WARNING

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-

sassemble the inverter to prevent an electric shock. 
Perform discharging by connecting the discharging 
resistance or plug of soldering iron to + , – terminals 
of the C10 too 13 electrolytic capacitor (760μF) of 
P.C. board. 
Never use a screwdriver or similar device to di-
scharge the electrolytic capacitor components as a 
electric shock may occur.
Under system fault condition, the electrolytic capa-
citor components may not have discharged. Ensure 
these are discharged before proceeding.

2. Remove connectors which are connected from the 

cycle P.C. board to the other parts.

3. Lead wires Connection with the power terminal 

block: 3 wires (Black, White, Orange)
Earth wire: 1 wire (Black)

4. Connectors

Connection with compressor: Remove 3P connector.
Connection with reactor: Remove the relay 
connectors from P08, P09 and P12, P13.
CN600: TD sensor (3P)
CN601: TO sensor (2P)
CN604: TE sensor (2P) 
CN605: TS sensor (3P)
CN301: Upper outdoor fan (3P)
CN300: Detection of upper outdoor fan (5P)
CN302: Lower outdoor fan (3P)
CN303: Detection of lower  outdoor fan (5P)
CN500: Case thermo. (2P)
CN700: 4-way valve (3P)
CN702: PMV (Pulse Motor Valve) (6P)

REQUIREMENT

As each connector has a lock mechanism, avoid to 
remove the connector by holding the lead wire, but 
by holding the connector.

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inverter assembly.

6. Lift up the hook (upper left) with the partition plate 

upward just removing.

Heat exchanger

Fin guard                

Air-outlet cabinet

One of two hooks

Heat sink cover

P.C. Board

Different lock mechanisms of different inverter board connectors

14-03-2011   14:46:47

112

30AW

 

    Maintenance

8

N°

Exchange
parts
name

Work procedure (IMPORTANT: Ensure gloves are 
worn at all times to avoid risk of injury)

Remarks

(5)

Cycle PC 
board 
(012)

1. Perform the works from 1 to 4 of (1) ,(3) and (4).
2. Remove connectors and lead wires: 

Connector
CN800: Connection with IPDU P.C. board (5P)
CN01: Connection with IPDU P.C. board (5P)
CN02: Indoor/Outdoor connection terminal block 
(3P)
CN03: Connection with IPDU P.C. board (3P)
CN04: Connection with IPDU P.C. board (2P).

REQUIREMENT

As each connector has a lock mechanism, avoid to 
remove the connector by holding the lead wire, but 
by holding the connector.

3. Remove the supporting hooks at 4 corners to remo-

ve the cycle P.C. board.

4. Mount a new cycle P.C. board.
5. Lift up the hook (upper left) with the partition plate 

upward just removing.

(6)

IPDU P.C. 
board 
(012)

1. Perform the works from 1 to 4 of (1) ,(3), (4), and (5).
2. Remove the screws of the inverter assembly to sepa-

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3. Remove the connectors and the lead wires which 

are connected from IPDU P.C. board to the other 
parts.

Connector

CN04: Connection with cycle P.C. board (3P)
CN05: Connection with cycle P.C. board (2P)
CN06: Connection with cycle P.C. board (5P)
CN13: Connection with cycle P.C. board (5P)
CN600: Heat sink sensor (2P)
Lead wire
CN01: Connection with power terminal block (Red)
CN02: Connection with power terminal block (White)
CN03: Connection with inverter box (Black)
CN09: Connection with compressor (Red)
CN10: Connection with compressor (White)
CN11: Connection with compressor (Black)
Rectifier diode
+ : Red lead wire 
– : White lead wire 

ATTENTION:

The rectifier diode has polarity, so be careful to + and 
–. If + and – are mistaken, a trouble is caused.
~ : Orange lead wire (Top)
~ : Brown lead wire (Bottom)
REQUIREMENT
As each connector has a lock mechanism, avoid to 
remove the connector by holding the lead wire, but 
by holding the connector.

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5. Remove the two screws which fix the heat sink and 

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board (5 positions) to remove IPDU P.C. board.

6. Mount a new IPDU P.C. board.

14-03-2011   14:46:47