Toshiba HWS-G1901CNMR-E, HWS-G1901CNRR-E, HWS-G1901ENXR-E, HWS-G1901CNXR-E, HWS-G2601CNRR-E Service Manual

FILE No. EU-SVM-18001 R01

AIR TO WATER HEAT PUMP

Service Manual

Domestic Hot Water Heat Pump

Model name:

HWS-G1901CNMR-E HWS-G1901CNRR-E HWS-G1901CNXR-E HWS-G1901ENXR-E HWS-G2601CNMR-E HWS-G2601CNRR-E HWS-G2601CNWR-E HWS-G2601ENXR-E

Domestic Hot Water Heat Pump Service Manual

1

Model naming convention:

H W S - G 1 9 0 1 C N M R - E

E

R

M R

X

N

C E

1

190 260

G

Europe

Area

Tank Type

Factory

HWS

Thermodynamic HWS

Model Type

A2W

TCEU

Standard Tank (45°)

180° variant tank

Deluxe PCB

Type

Coil Type

Coil

Extra coil

190l Capacity

260l Capacity

Enamelled Steel

Tank Material

Series Number

Series 1

Water Tank Capacity

Domestic Hot Water Heat Pump Service Manual

2

Contents

1.0

Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4

2.0

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6

3.0

DHW-HP Drawings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7

4.0

Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.1 PC Board and connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9 4.2 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10

5.0

Key electric component rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11

6.0

Refrigerant cycle / water system diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1 Refrigeration cycle system diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12

6.2 Water system diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12

7.0

Operational description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.1 P1 AUTO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

15

7.2 P2 ECO mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16 7.3 P3 BOOST mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

17

7.4 P4 BACKUP mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

18

7.5 P5 SILENT mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19

7.6 P6 HOLIDAY mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

19

7.7 B4 Hot on time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20 7.8 B3 Low tariff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

20

7.9 B1 Ventilation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

21

7.10 B5 Photovoltaic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

22

7.10.1 PV ECO operation in AUTO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

25

7.10.2 PV ECO operation in BOOST mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26

7.10.3 PV Storage operation in BOOST mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

27 7.11 D26 Extra function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

28

7.11.1 B6 Solar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

28

7.11.2 B7 Floor / B8 Floor T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

29

7.11.3 B9 Cooling / Cooling T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

30

7.12 D27 SG Ready . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31

7.13 D29 External control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

33 7.14 Defrost operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

35

7.15 Legionella operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36

8.0

Modbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

38

8.1 Monitoring functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

40

8.2 Read & write functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

41

9.0

Method of defect analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.1 Matters to be confirmed first . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

44

9.1.1 Check the power supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

44

9.1.2 Check the cold water supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

44

9.2 In the event of error – how to operate BACK-UP mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

45

9.3 Error codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

45

9.4 Error code analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

45 9.4.1 Er1 ~ Er5 – Temperature sensor error analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

46

9.4.2 Er HP – High pressure switch error analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

46

9.4.3 Er Evap – Evaporator temperature error analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

47

9.4.4 Er H Evap – High evaporator temperature error analysis . . . . . . . . . . . . . . . . . . . . . . . . .

47

9.4.5 Er C Evap – Low evaporator temperature error analysis . . . . . . . . . . . . . . . . . . . . . . . . .

48

9.4.6 Er Filter – Change filter error analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

48 9.5 Resetting of error code & BACK-UP mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

48

10.0

DHWHP Settings

10.1 Home view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

49

10.1.1 Information menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50

10.1.2 Mode of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

51

10.1.3 Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

52

10.1.4 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

53 10.1.5 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

54

10.1.6 Installer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

55

11.0

Periodic inspection items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

58

11.1 Environmental requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

58

11.2 Heating system and fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

58 11.3 Condensation and condensate drain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

58

Domestic Hot Water Heat Pump Service Manual

3

11.4 Water circulation and tank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11.4.1 Pressure relief valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

58

11.4.2 Anode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

59

12.0

Part exploded view, part list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

60

13.0

Main components replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13.1 Open & remove the front panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

61

13.2 Remove the top shell & top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

62

13.3 Remove the evaporator housing top . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

63

13.4 Replace the heating element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

63

13.5 Replace the safety breakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

64

13.6 Replace the anode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

64 13.7 Replace the solenoid valve, coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

65

13.8 Replace the fan kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

66

13.9 Replace the BT1 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

66

13.10 Replace the BT2 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

67

13.11 Replace the BT3 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

67

13.12 Replace the BT4 Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

68 13.13 Replace the Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

69

13.14 Replace the Tube kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

70

13.15 Replace the PCB Board standard & deluxe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

71

13.16 Replace the display & frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

71

Domestic Hot Water Heat Pump Service Manual

4

1.0 Safety precautions

 The product shall be installed, commissioned, repaired only by qualified technicians. Incorrect installation can

result in damage to property and/or injuries to people and animals.

 The unit shall be disconnected from the power supply when the cover is off.  The unit shall not be used by children or people with limited physical or mental capacity.  Children should be supervised to ensure that they do not play with the appliance.  Cleaning and maintenance shall not be made by children without supervision.  Do not place flammable materials in contact or close to the unit.  The water system and the air system should be installed as stated in the manual.  When in service, the unit should not be placed in sub-zero temperature areas.  When not in service, the unit can be placed in sub-zero temperature areas, but all the water in the tank or in the

condensate drain should be removed.

 Hot water can cause serious burns if directly connected to the taps. The installation of a mixing valve is suggested.  The unit should be used only for its specified use. The manufacturer is not liable for any damages due to failure to

observe this manual.

 Take all the possible precautions to avoid incidents.  The product contains HFC-R134a  The electrical supply, for the domestic hot water heat pump, must be protected by an earth leakage breaker and an

overcurrent protection device (fuse or circuit breaker). Failure to comply with this precaution may result in electric shock or fire

 This unit must be connected to the main power supply using a circuit breaker or switch with a contact separation of

at least 3mm

Introduction

The aim of this manual is to give information, instructions and warnings on the domestic hot water heat pump. The manual is to be used by service engineers, since it contains important safety, diagnosis and operational indications. The manual is a part of the domestic hot water heat pump and it is to be conserved with care, since it contains important installation and maintenance instructions that can be useful to assure a long life time and an efficient operation.

About the product

The product is a domestic hot water heat pump (DHWHP) that has been designed according to EU directives. The product is intended for hot water production for domestic use or for similar applications. The unit has been designed to be ready for installation.

General

The domestic hot water heat pump is composed of a water tank, a refrigerant circuit, a cabinet and a display connected to a control board. The main scope of the appliance is to heat water stored in a tank.

Operation

The unit is programmed to start heating the water inside the tank when its temperature falls below a predetermined level, BBT3 (T Tank Top) is 5K<SP. The unit stops when the water temperature reaches a set point (SP) that can be regulated by the user. In general, the appliance is designed to produce enough hot water to cover the need of a household of 4 persons or more.

There are two ways in which the DHW-HP can heat the water:

1) Heat pump operation In the operation with heat pump, a heating cycle utilizes the operation of a compressor and the extraction of the heat from the air to heat the water in the tank. This is the standard way used to heat the domestic hot water, since it leads to lower electricity consumption, hence also lower running costs.

2) Electric heater operation The water is heated using an electric heater. An electric resistance is powered to heat the water in a safe, fast and flexible way. However, using the electrical heater can become an expensive way to produce hot water. This operation should be used as a back-up or as integration of the standard operation.

Domestic Hot Water Heat Pump Service Manual

5

The electric heater is activated in case of:

 Failure of the heat pump operation, this requires an override command from the end user to be confirmed  Too high or too low air temperature  The quantity of hot water produced is not enough.

Note: The amount of water heated by the electric heater is at a reduced volume; see the performance data for these values.

Heating circuit

As depicted in the figure below, the heat pump cycle can be divided in four main processes: compression (1-2), condensation 2-3), expansion (3-4) and evaporation (4-1) described below.

 At the suction of the compressor (1) the superheated gas refrigerant enters the compressor at a low pressure.  In the compressor, the gas is compressed to a higher pressure and temperature level (2).  The gas is first de-superheated and condensed in the condenser, exchanging heat with the water stored in the

tank.

 The refrigerant exits the condenser in a subcooled, liquid form (3)  Through the thermostatic expansion valve the pressure of the refrigerant is lowered to allow its evaporation at a

lower temperature (4)

 The refrigerant is evaporated in the fin-coil heat exchanger that uses forced air as a heat source (1)  The process goes on until the power supply to the compressor is stopped.

Note: the extensive use of the electric heater leads to a higher electricity consumption and it may lead to high electricity bills. The operation with the heat pump normally consumes more than 3 times less electricity than the operation with electric heater. The energy released to the condenser (2-3) is, in fact, the sum between the free energy extracted from the air in the evaporator (1-4) and the energy supplied to the compressor (2-1). On average, the energy absorbed by the evaporator is more than double of the energy used to run the compressor.

Safety instructions – Heating circuit

 Only skilled and trained technicians shall carry out repair and service of the heat pump circuit.  Before opening the heating circuit, discharge the refrigerant to a level that allows safe working conditions.  The refrigerant can be toxic if inhaled or if in high concentrations.  Special attention should be given if the work is carried out with an open flame.

Domestic Hot Water Heat Pump Service Manual

6

2.0 Specifications

Physical data

Domestic Hot Water Heat Pump

HWS-G1901CN*R-E

HWS-G2601CN*R-E

HWS-G1901ENXR-E

HWS-G2601ENXR-E

Dimensions (Height x Diameter)

mm

1600x620

1960x620

1600x620

1960x620

Weight (dry / wet)

kg

91 / 281

106/356

107/297

126/376

Nominal insulation thickness

mm

50

Refrigerant R134A

R134A

Refrigerant charge

kg

1.2

1.28

1.2

1.28

Refrigerant charge CO2 equivalent

ton

1.70

1.80

1.70

1.80

Water connections (cold & hot water)

inch

3/4

Water connections (entry angle)

deg.

45 / 180

Condensates water connections

mm

Ø19

Max water side operating pressure

Mpa

0.6

Power supply

V-ph-Hz

230-1-50

Performance data

Domestic Hot Water Heat Pump

HWS-G1901CN*R-E

HWS-G2601CN*R-E

HWS-G1901ENXR-E

HWS-G2601ENXR-E

Energy Class - A+

A+

COP at Air7°C W10°C-52,9°C (EN16147)

-

3.57

3.69

3.57

3.69

Heat up time (A7°C W10°C-53,5°C)

hh:mm

06:27

09:12

06:27

09:12

COP at Air20°C W10°C-52,9°C (EN16147)

-

4.13

4.2

4.13

4.2

Heat up time (A20°C W10°C-53,5°C)

hh:mm

05:15

07:09

05:15

07:09

Cylinder volume

l

190

260

184

252

V40 volume (W52.9°C)

l

247

347

234

331

Maximum Qty of water by electric heater only

l (%)

75 (40%)

130 (50%)

75 (40%)

130 (50%)

Maximum water temperature

°C

60

Corrosion protection

Magnesium anode

Heat pump operating range (min/max)

°C

-7 / +40

Electrical heater Power

W

1500

Maximum Power input

W

2185

Auxiliary Power input (Paux)

W

1.61

Standby Power input (Pes)

W

17

20

17

20

Sound power level - Air7°C W10°C-52,9°C (EN16147)

dB(A)

49

Sound power level - Air20°C W10°C-52,9°C (EN16147)

dB(A)

55.6

Airflow rate nominal (min - max)

m3/h

450 (0 - 800)

Maximum fan power

W

85

Maximum external static pressure

Pa

200

Air duct connections

mm

Ø160

+Ø160

Ø160

Minimum room volume (non-ducted unit)

m3

60

Fan Curve

The graph shows the external static pressure vs airflow at different fan speeds.

In order to assure an efficient operation, it is suggested to keep the external pressure drops below 200 Pa.

Domestic Hot Water Heat Pump Service Manual

7

3.0 DHW-HP drawing

Parameter

Unit

HWS-G1901***R-E

HWS-G2601***R-E

Dimensional Data

A – Height

mm

1610

1960

B

mm

385

C

mm

280

D1

mm

180

300

D2

mm

435

670

D3

mm

375

E1

mm

285

E2

mm

305

F – Diameter

mm

603

G – Diameter

mm

160

H – Max Diameter

mm

620

Height required for installation

mm

1700

2040

Standard DHW-HP weight dry/wet

kg

94 / 284

100 / 350

Additional coil DHW-HP weight dry/wet

Kg

100/300

120/370

Nominal insulation thickness

mm

50

Domestic Hot Water Heat Pump Service Manual

8

Refrigerant circuit GQ1: Compressor GQ2: Fan RM1: Check valve EP1: Condenser EP2: Evaporator HZ1: Filter drier QN1: Solenoid valve QN2: Thermostatic expansion valve XL3: Service valve

Water circuit XL1: Water outlet XL2: Water inlet XL4*: Coil top XL5*: Coil bottom XL6: Air outlet XL7: Air inlet XL8: Condensate outlet XL9*: Hot water circulation EP3*: Coil EB1: Electric heater FR1: Anode FN1: Thermal protection

The items with * are optional.

Figure 4 – Design of the heating circuit and the main components

Sensors

BBT1: Air inlet temperature BBT2: Evaporator temperature BBT3: Tank water temperature BBT4*: Additional temperature BBT5*: Additional temperature (not included) BP1: Pressostat

Electric components AA1: Main printed circuit board AA2: Display circuit board WF1: Modbus port GC1*: Solar 0-3V/10V QA1*: SG-ready port GP1*: Additional supply to pump or damper

The items with * are optional.

Figure 5 – Design of tank, condenser and related components

Nomenclature according to standard IEC 81346-1 and 81346-2.

Domestic Hot Water Heat Pump Service Manual

9

4.0 Wiring diagram

4.1 PC Board and connections

Domestic Hot Water Heat Pump Service Manual

10

4.2 Schematic

= Schematic shows all available options connected to the DHWHP PCB. In reality it is not possible to connect the solar thermal panel / circuit at the same time as the underfloor heating circuit.

It is only possible to connect one of these options to the DHWHP at any one time

= Schematic shows all available options connected to the DHWHP PCB. These options are only available with the deluxe model DHWHP units only.

BLU

B (D-)

L

N

L

N

0V

L

0V

0~10V

Input

BT3

EB1

0V

FM

BT2

BT1

0V

L

N

PE

230VAC ~ 50Hz

0V

A (D+)

0V BLU

0~10V PWM

YEL

High pressure switch.

Compressor STOP when

Pd ≥ 2.0MPa

Solenoid valve.

Solenoid ON for 2 min

before compressor

starts and during

system defrost

BRN

BLK

N

BLU

BLK

BRN

BLU

#1

Energy Meter

Communication to

/ from power grid

SG2

SG1

0V

#2

Modbus

communication

Inverter

#2

Solar

PV

BT4

#1#1#2

BT5

Under floor

heating

or

Cooling

Room

temperature

Under floor heating circuit

#2

Solar

Thermal

BT5

#1

Domestic Hot Water Heat Pump Service Manual

11

5.0 Key electric component rating

No.

Component Name

Model

Type

Rating

Standard

Deluxe

Refrigeration

1 Highly compressor

ο

WHP01900BUV-H8JU

Winding resistance

4.82/6.22Ω (at 20°C)

2 Case thermostat

ο

B110-160-241E

Contact open: 160±10°C Contact Close: 70±10°C

3

Fan motor

ο

R3G220-RC05-17

230V / 0.7A / 50-60Hz

4

Solenoid

ο

FDF2.5A 08

230V / 50-60Hz

5

High pressure switch

ο

UL1015 18AWG

Open press: 20±1 bar

Electrical

6

Heating element

ο

Kanthal D or 0Cr23AI5

230V / 1500W

7

Heater thermostat (x2)

ο

El Matik KB

80±3°C

Sensors

8

BBT1 Motron

ο

AHC3.782.244-65A (L=400mm)

R25=22.00k +/-1%, -30 to +105°C

9

BBT2 Motron

ο

AHC3.782.244-65B (L=900mm)

R25=22.00k +/-1%, -30 to +105°C

10

BBT3 Motron

ο

AHC3.782.244-65C (L=2200mm)

R25=22.00k +/-1%, -30 to +105°C

11

BBT4 Motron

-

ο

AHC3.782.244-65D (L=2700mm)

R25=22.00k +/-1%, -30 to +105°C

12

BBT5 Motron

-

ο

AHC3.782.244-65D (L=2700mm)

R25=22.00k +/-1%, -30 to +105°C

0

50000

100000

150000

200000

250000

300000

350000

-40 -20 0 20 40 60 80 100 120 140

R-ntc [ohm] vs Temperature [C]

Domestic Hot Water Heat Pump Service Manual

12

6.0 Refrigerant cycle / water system diagram

6.1 Refrigerant cycle

6.2 Water system cycle

XL1: Water outlet pipe connection XL2: Water inlet pipe connection XL4: Coil top* XL5: Coil bottom* XL9: Water circulation connection* QN3: Shut-off valve water outlet QN4: Shut-off valve water inlet QN5: Drain valve QN6: Safety valve** QN7: Expansion tank** QN8: Shut-off valve pump inlet* QN9: Shut-off valve pump outlet* RM3: Check valve RM4: Check valve water circulation* GP1: Water circulation pump*

* Optional additional coil ** Safety equipment required for the installation to be locally sourced (i.e. safety group, expansion vessel)

QN7

QN5

QN6

QN3

RM3 QN4

QN3

QN9

Domestic Hot Water Heat Pump Service Manual

13

Example of a standard circuit with the DHW-HP installation

Example of a circulation circuit with the DHW-HP installation

Example of solar thermal circuit with the DHW-HP installation

2 1

8 9 11

10

6

7 4 3

5

TOSHIBA

2

1

8 9

11

10

16

15

14

13 12

6

7 4

3

5

TOSHIBA

17

18

2

1

8 9

11

10

16

6

7 4

3

5

TOSHIBA

19

20

Domestic Hot Water Heat Pump Service Manual

14

Example of underfloor heating circuit with the DHW-HP installation

21 22

2

1

8 9

11

10

16

6

7 4

3

5

TOSHIBA

19

20

1

Bath

12

Isolation valve return flow

2

Sink

13

Check valve

3

Cold water supply shut off valve

14

Circulation pump

4

Safety group

15

Isolation valve circulation

5

Cold water supply drain valve

16

Water circulation connection point

6

Expansion vessel

17

Solar thermal collectors

7

Cold water supply pipe connection

18

Pump & expansion vessel

8

Hot water outlet pipe connection

19

Extra coil inlet

9

Temperature & pressure relief valve (6 bar / 90°C)

20

Extra coil outlet

10

Hot water supply drain valve

21

Circulation pump

11

Hot water supply shut off valve

22

Underfloor heating circuit

Domestic Hot Water Heat Pump Service Manual

15

7.0 Operational description

7.1 P1 AUTO mode

This is the standard operation mode for the domestic hot water heat pump. The temperature is set from main menu, by pressing the ’OK’ button. Select ‘A Temperatures’ and then A1 AUTO to set temperature for auto mode, default set point is 53°C. As long as the air inlet temperature, BT1, is within the specified temperature range, default -7 ~ +40°C then the DHW-HP will operate normally, if BT1 temperature is outside of its operating range then the water will be heated using the electrical heater only.

Code

Set Point

Name

Description

Range

Factory

setting

A1

T AUTO

The temperature level at which the DHW-HP heats the water when AUTO mode is selected.

50 ~ 60

53.5

The DHW-HP will then heat the water to set point using the heat pump only. If the water temperature, BT3, reduces by 5°C then the DHW-HP will start to reheat the water temperature back to set point.

 DHW-HP starts operation on selection of AUTO mode, T AUTO <SP -5k  DHW-HP stops when BT3 = T AUTO SP (53.5°C factory setting)  DHW-HP restarts when T AUTO = SP -5k  DHW-HP stops when BT3 = T AUTO SP (53.5°C factory setting)

0

10

20

30

40

50

60

70

80

00:00:00

00:07:40

00:15:20

00:23:00

00:30:40

00:38:20

00:46:00

00:53:40

01:01:20

01:09:00

01:16:40

01:24:20

01:32:00

01:39:40

01:47:20

01:55:00

02:02:40

02:10:20

02:18:00

02:25:40

02:33:20

02:41:00

02:48:40

02:56:20

03:04:00

03:11:40

03:19:20

03:27:00

03:34:40

03:42:20

03:50:00

03:57:40

04:05:20

04:13:00

04:20:40

04:28:20

04:36:00

04:43:40

04:51:20

04:59:00

05:06:40

05:14:20

05:22:00

05:29:40

05:37:20

05:45:00

05:52:40

06:00:20

06:08:00

06:15:40

06:23:20

06:31:00

06:38:40

06:46:20

T1 T air in T3 T water top

HP_OnTemp HP_OffTemp

R3 Fan R4 Comp



Fan Off

Fan On

Comp Off

Comp On







Domestic Hot Water Heat Pump Service Manual

16

7.2 P2 ECO mode

This is the standard operation mode for the domestic hot water heat pump.

The temperature is set from main menu, by pressing the ’OK’ button. Select ‘A Temperatures’ and then A2 ECO to set temperature for eco mode, default set point is

50°C. As long as the air inlet temperature, BT1, is within the specified temperature range, default -7 ~ +40°C then the DHW-HP will operate normally, if BT1 temperature is outside of its operating range then the water will be heated using the electrical heater only.

Code

Set Point

Name

Description

Range

Factory

setting

A2

T ECO

The temperature level at which the DHW-HP heats the water when ECO mode is selected.

50 ~ 55

50

The DHW-HP will then heat the water to set point using the heat pump only. If the water temperature, BT3, reduces by 5°C then the DHW-HP will start to reheat the water temperature back to set point.

 DHW-HP starts operation on selection of ECO mode, T ECO <SP -5k  DHW-HP stops when BT3 = T ECO SP (50°C factory setting)  DHW-HP restarts when T ECO = SP -5k  DHW-HP stops when BT3 = T ECO SP (50°C factory setting)

0

10

20

30

40

50

60

70

80

00:00:00

00:07:40

00:15:20

00:23:00

00:30:40

00:38:20

00:46:00

00:53:40

01:01:20

01:09:00

01:16:40

01:24:20

01:32:00

01:39:40

01:47:20

01:55:00

02:02:40

02:10:20

02:18:00

02:25:40

02:33:20

02:41:00

02:48:40

02:56:20

03:04:00

03:11:40

03:19:20

03:27:00

03:34:40

03:42:20

03:50:00

03:57:40

04:05:20

04:13:00

04:20:40

04:28:20

04:36:00

04:43:40

04:51:20

04:59:00

05:06:40

05:14:20

05:22:00

05:29:40

05:37:20

05:45:00

05:52:40

06:00:20

06:08:00

06:15:40

06:23:20

06:31:00

06:38:40

06:46:20

T1 T air in T3 T water top

HP_OnTemp HP_OffTemp

R3 Fan R4 Comp

Fan Off

Fan On

Comp Off

Comp On









Domestic Hot Water Heat Pump Service Manual

17

7.3 P3 BOOST mode

This is the standard operation mode for the domestic hot water heat pump. The temperature is set from main menu, by pressing the ’OK’ button.

Select ‘A Temperatures’ and then A2 ECO to set temperature for eco mode, default set point is

50°C. As long as the air inlet temperature, BT1, is within the specified temperature range, default -7 ~ +40°C then the DHW-HP will operate normally, if BT1 temperature is outside of its operating range then the water will be heated using the electrical heater only.

Code

Set Point

Name

Description

Range

Factory

setting

A3

T BOOST

The temperature level at which the DHW-HP heats the water when BOOST mode is selected.

50 ~ 65

55

The DHW-HP will then heat the water to set point using the heat pump and the electrical heater together. If A3 T BOOST temperature is set higher than D33 (Temp HP max – default 60°C) then the remaining temperature above this set point is reached by electrical heater only operation If the water temperature, BT3, reduces by 5°C then the EL heater will start to reheat the water temperature back to set point. The HP requires the BT3 temperature to reduce to 5°C below D33 (Temp HP Max SP) In this case 8°C below BOOST mode temperature set point (A3 = 63°C).

NOTE: A3 T BOOST set to 63°C for illustration purposes. NOTE: Volume of water heated by EL heater is only a percentage of the full water volume, as

follows: 190l = 75l (40%)

260l = 130l (50%)

0

10

20

30

40

50

60

70

80

90

100

00:00:00

00:04:20

00:08:40

00:13:00

00:17:20

00:21:40

00:26:00

00:30:20

00:34:40

00:39:00

00:43:20

00:47:40

00:52:00

00:56:20

01:00:40

01:05:00

01:09:20

01:13:40

01:18:00

01:22:20

01:26:40

01:31:00

01:35:20

01:39:40

01:44:00

01:48:20

01:52:40

01:57:00

02:01:20

02:05:40

02:10:00

02:14:20

02:18:40

02:23:00

02:27:20

02:31:40

02:36:00

02:40:20

02:44:40

02:49:00

02:53:20

02:57:40

03:02:00

03:06:20

03:10:40

03:15:00

03:19:20

03:23:40

03:28:00

03:32:20

03:36:40

03:41:00

03:45:20

03:49:40

Temperature (°C)

T1 T air in T3 T water top HP_OnTemp

HP_OffTemp E_HeatOnTemp E_HeatOffTemp

R3 Fan R4 HP R5 El Heater

Fan OFF

Fan ON

HP OFF

HP ON

EL Heat OFF

EL Heat ON



    

Domestic Hot Water Heat Pump Service Manual

18

 DHW-HP starts operation on selection of BOOST mode, T BOOST <SP -5k  HP stops operation at Temp HP Max SP (D33) 60°C  DHW-HP continues heating water using EL only until SP (63°C)  Electric Heater restart is based on SP (63°C) -5k (58°C)  HP restart is based on Temp HP Max (D33 = 60°C) -5k (55°C)  HP stops operation at Temp HP Max SP (D33) 60°C  DHW-HP continues heating water using EL only until SP (63°C)

7.4 P4 BACKUP mode

This is an emergency mode. The water is heated up by the electric heater only at a lower set temperature. The water temperature set point is set in the installer menu, D12 (Backup T). In the case of an error, a message is displayed on the LCD display requesting if Back Up mode is required. There is a yes/no input selection required to activate or disable.

The legionella control remains active.

Code

Set Point

Name

Description

Range

Factory

setting

D12

Backup T

The temperature level at which the El heater heats the water when BACK UP mode is activated /selected

0 ~ 65

35

EL starts when BBT3 (T Tank t) < D12 (BACKUP T) -5°C EL stops when BBT3 (T Tank t) = D12 (BACKUP T)

Note: Back up mode can only be deactivated after rectifying the cause of the fault. Once the fault has been repaired a power cycle (Off/ On) is required to reset the error code. Normal operation can be resumed by pressing the arrow, up or down, buttons to select the required operating mode.

If an error occurs, using the up or down buttons, select Yes or No, if no is selected the unit has No operation.

If Yes is selected the DHW-HP changes to BACKUP operation and the unit operates at the BACKUP mode temperature setting from D12. After fault rectification and power reset, using the mode selection screen, choose operation mode.

Domestic Hot Water Heat Pump Service Manual

19

7.5 P5 SILENT mode

This mode decreases the fan speed to D5 (Min fan speed) in order to minimize the sound emissions

The DHW-HP is controlled by the A1 AUTO operation mode The unit starts when BBT3 (T Tank t) < A1 (T AUTO) -5°C The unit stops when BBT3 (T Tank t) = A1 (T AUTO)

 System operating in AUTO mode  Operating mode changed to SILENT.

Fan speed lowers from D6 (AUTO Speed) SP of 57% (factory set point) to D5 (Min Fan Speed) SP of 40% (factory set point)

 Operating mode returned to AUTO mode

Fan speed raises from D5 (Min Fan Speed) SP of 40% to D6 (AUTO speed) of 57%

Note: In SILENT mode the controlled temperature set point is from AUTO mode.

7.6 P6 HOLIDAY mode

DHW-HP does not start when the water heating is required. The HP is OFF except during Legionella control, which is still activated once a week on the selected day from D15 (Legionella date). The HOLIDAY mode is connected to B4 (Hot on Time). After the HOLIDAY period is completed, the unit goes back to the previous mode of operation.

0

10

20

30

40

50

60

70

80

90

00:00:00

00:00:40

00:01:20

00:02:00

00:02:40

00:03:20

00:04:00

00:04:40

00:05:20

00:06:00

00:06:40

00:07:20

00:08:00

00:08:40

00:09:20

00:10:00

00:10:40

00:11:20

00:12:00

00:12:40

00:13:20

00:14:00

00:14:40

00:15:20

00:16:00

00:16:40

00:17:20

00:18:00

00:18:40

00:19:20

00:20:00

00:20:40

00:21:20

00:22:00

00:22:40

00:23:20

00:24:00

00:24:40

00:25:20

00:26:00

00:26:40

00:27:20

00:28:00

00:28:40

00:29:20

00:30:00

00:30:40

00:31:20

Temperature (°C)

T1 T air in T2 air out T3 T water top

FanSpeedSet R3 Fan R4 HP

Fan OFF

Fan ON

Comp OFF

Comp ON







Domestic Hot Water Heat Pump Service Manual

20

7.7 B4 Hot on time

The unit can be programmed to deliver hot water from 1 to 30 days from the moment in which the function is activated and the HOLIDAY mode is selected.

The unit switches to A1 AUTO mode after the desired number of days is reached. If OFF is selected the function is not active.

i.e. To set a 7 day Hot on Time function

1. Push the ‘OK’ button for the main menu

2. Use the Up or Down arrows to highlight ‘B Functions’ menu and push the ‘OK’ button

3. Use the Up or Down arrows to highlight ‘B4 Hot on Time’ and push the ‘OK’ button.

4. Use the Up and Down arrows to select the number of days required for the unit to switch on to A1 AUTO mode and push the ‘OK’ button.

The duration of the HOLIDAY mode is now set. Note: This function is not activated until ‘HOLIDAY’ is selected from the mode selection screen,

accessed by pushing the Up or Down arrow from the home screen.

7.8 B3 Low Tariff

The low tariff allows the electric heater and the heat pump to run only during periods with low electricity prices, according to the menu item that regulate the program of the low tariff D17/ D18 (Low tariff weekday/weekends). The unit runs only during pre-defined hours of the day.

Code

Set point name

Description

Range

Factory setting

B3

Low Tariff Standard

If the PV function (B5) is active, this allows the electric heater and the heat pump to run outside the low tariff period.

OFF/ Standard/ Optimal 1/ Optimal 2

OFF

Low Tariff Optimal 1

This function allows the maximum exploitation of the lower electricity price during the night periods between 00:00 and 05:00

Low Tariff Optimal 2

This function allows the maximum exploitation of the lower electricity price during the night periods between 00:00 and 05:00.

During the day, the unit works according to Low Tariff periods D17 and D18

Electric heater operation (Optimal 1 and Optimal 2)

 The EL can operate only at night, between 01:00 and 05:00  The EL starts operating when the amount of heat that can be produced by the HP (Qdisp) is not

sufficient to cover the amount of heat needed to reach the water temperature set point by 5:00 (Qreq).

 The EL cannot operate more than3 hours/day. 2 other hours are used to calculate the Qreq and

Qdisp (normallybetween00:00-01:00 and 02:00-03:00) and EL cannot be used in these periods.

 The EL, if activated, works for at least one continuous hour.  If the water set point temperature has not been reached by 4:00, EL will operate for the last

hour(until05:00), or until the water temperature set point is reached.

 In normal conditions, the EL is activated only if also the HP is active.  If the heat pump is not operating, the EL will be activated only in case the external ambient

conditions don’t allow HP operation (Inlet air temperaturebelow-7°C or above40 °C.

Domestic Hot Water Heat Pump Service Manual

21

Heat pump operation (Optimal 1 and Optimal 2)  If the water temperature is below set point temperature minus hysteresis, the HP starts its operation

(normally at 00:00).

 Optimal 1: The HP is allowed to run also during the day(according to MODE of operation  Optimal 2: The HP is always allowed to run in the night period(between00:00 and 5:00) plus it is

allowed to run in the periods described by D17/D18 (Low tariff period weekday/weekend)

7.9 B1 Ventilation

This mode is used for the ventilation of air from a room and distributed either into the DHW-HP room location or ducted outside of the building.

Using the function B1 (Ventilation) the DHW-HP can be set to 3 operation modes, Off, single speed or 2 speed

To complete the ventilation mode setup B2 (Ventilation Fan Speed) can be set.

Code

Set point name

Description

Range

Factory setting

B1

Ventilation OFF

The fan switches off when the heat pump does not run.

OFF/ Single Speed/ 2Speeds

OFF

Single speed

The fan is always running at a single fixed speed (B2 Fan speed), both when the heat pump is operating and when it is not.

2 Speeds

The fan is always in operation but it runs normally at a higher speed D6 (Fan AUTO Speed) when the heat pump starts operating and at (B2 Fan speed) when it is not operating.

B2

Fan speed

The main fan speed regulation for the ventilation function. There are three ventilation level that can be selected: LOW D5 (Min Fan Speed), MEDIUM D4 (Fan medium speed) HIGH D3 (Max fan speed).

LOW/ MEDIUM/ HIGH

HIGH

Domestic Hot Water Heat Pump Service Manual

22

Single Speed Operation 2 Speed Operation

7.10 B5 Photovoltaic

The domestic hot water heat pump (DHWHP) can be controlled by a signal from a solar photovoltaic (PV) converter or an energy meter, either as simple start/stop via a potential free contact or by a variable signal.

The diagrams below represent possible installation configurations with or without energy meter. Using the variable signal option, a certain output (VDC or mA) from the (PV) inverter or the

energy meter corresponds to a given amount of excess power for use in the DHWHP. This excess power can be used to activate either the electrical immersion heater, the heat pump (HP) or both.

PV installation 1: control signal from inverter. PV installation 2: control signal from energy meter.

\

T3:Temperature Tank Top

DHW AUTO mode set point of 53°C Ventilation ON

Ventilation fan speed LOW

Ventilation mode single speed Note: This may have an impact on performance due to fan reduction in DHW mode

Temperature °C

Fan

Auto

Low5350

48

12

T3:Temperature Tank Top

DHW AUTO mode set point of 53°C Ventilation ON

Ventilation fan speed LOW

Ventilation mode 2 speed

Auto

4812Low

Fan

Temperature °C

53

50

TB1: DC/AC Inverter BU: Energy meter E1-2-3: Electric loads WG1: Heat pump

power supply

GC1: Photovoltaic

function input signal (0-10 VDC 0-3 VDC, 4-20 mA).

Domestic Hot Water Heat Pump Service Manual

23

A graph to convert the signal input to % is available in figure 21

Conversion table of the controller input signal to percentage

The following schematic shows the electrical connections for the Solar PV operation

BLU B (D-)

N

L

0V

L

L 0V

0~10V

Input

BT3

EB1

0V0V0V

FM

BT2

BT1

0V

L

N

PE

230VAC ~ 50Hz

0V A (D+)

0V BLU 0~10V PWM

YEL

High pressure switch.

Compressor STOP when

Pd ≥ 2.0MPa

Solenoid valve.

Solenoid ON for 2 min

before compressor

starts and during

system defrost

BRN

BLK

N

BLU

BLK

BRN

BLU

Inverter

Solar

PV

BT4

Domestic Hot Water Heat Pump Service Manual

24

PV operation is set up using a combination of the following functions:

Code

Set point name

Description

Range

Factory setting

B5

OFF

The PV function is not active. If this function is activated, the heat pump and the electric heater can start only if the input voltage in GC1 (0-10V) is higher than D20/D21 (PV min Voltage HP/EL) for longer than D22 (PV min time).

OFF/ ECO/ STORAGE

ECO

PV ECO

The PV function allows for water heating only with the heat pump until temperature set point defined by the MODE of operation is reached.

PV STORAGE

The PV function allows for water heating to the maximum temperature level, giving priority to the operation of the heat pump if the BOOST or BACK UP mode is not active. The heat pump operates alone until the max allowed temperature for the heat pump operation D33 (T HP Max) is reached. The electric heater operates only from D33 to the maximum allowable temperature D9 (Water T max).

D20

PV min Voltage HP

The minimum voltage (V) required to start the HP when the PV function is active.

0-10

0

D21

PV min Voltage EL

The minimum voltage (V) required to start the electric heater when the PV function is active.

0-10

0

D22

PV min time

The minimum time (minutes) at which the input voltage from the PV panel should be above the set point D20/D21 (PV min Voltage HP/EL) in order to start the electric heater or heat pump when the PV function is active D22 also regulates the minimum heat pump operational time when started by the PV function.

1-120

15

The following operational charts have these settings applied:

i) D20 (PV min voltage HP) set to 5V ii) D21 (PV min voltage EL) set to 8V iii) D22 (PV min time) set to 5mins iv) PV mode selected from B5 dependant on operation required (ECO or STORAGE)

Domestic Hot Water Heat Pump Service Manual

25

7.10.1 PV ECO operation in AUTO mode

When the photovoltaic mode is set to PV ECO and the DHW-HP mode is set to AUTO, there is no operation of the electrical heater, even if the 0~10V input rises above the D21 (PV Min Voltage EL) set point.

 0~10V input raised in small steps until >5V, set from D20 (PV Min Voltage HP)  HP starts after 5 minutes delay, set from D22 (PV Min Time)  In ECO / AUTO mode the heater should not operate, Voltage raised to >8V D21 (PV Min Voltage

EL)

 0~10V input decreased until <5V, set from D20 (PV Min Voltage HP)  HP stops after 5 minutes delay, set from D22 (PV Min Time)

Note: If water set point temperature is achieved then the heat pump stops operation.

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

0

10

20

30

40

50

60

70

80

90

00:00:00

00:01:20

00:02:40

00:04:00

00:05:20

00:06:40

00:08:00

00:09:20

00:10:40

00:12:00

00:13:20

00:14:40

00:16:00

00:17:20

00:18:40

00:20:00

00:21:20

00:22:40

00:24:00

00:25:20

00:26:40

00:28:00

00:29:20

00:30:40

00:32:00

00:33:20

00:34:40

00:36:00

00:37:20

00:38:40

00:40:00

00:41:20

00:42:40

00:44:00

00:45:20

00:46:40

00:48:00

00:49:20

00:50:40

00:52:00

00:53:20

00:54:40

00:56:00

00:57:20

00:58:40

01:00:00

01:01:20

01:02:40

01:04:00

01:05:20

01:06:40

01:08:00

Voltage

Temperature

Time

T3 T water top R3 Fan R4 HP

R5 El heater V in (0-10V)

Fan Off

Fan On

HP Off

HP On

El H Off

El H On

Fan Off

Fan On

HP Off

HP On

El H Off

El H On

Fan Off

Fan On

HP Off

HP On

El H Off

El H On











Domestic Hot Water Heat Pump Service Manual

26

7.10.2 PV ECO operation in BOOST mode

When the photovoltaic mode is set to PV ECO and the DHW-HP mode is set to BOOST, there is no operation of the electrical heater, even if the 0~10V input rises above the D21 (PV Min Voltage EL) set point.

 0~10V input raised until >8V, set from D20 (PV Min Voltage HP) & D21(PV Min Voltage EL)  HP starts after 5 minutes delay, set from D22 (PV Min Time). Electric heater does not start due to

PV ECO mode being selected.

 0~10V input decreased until <5V, set from D20 (PV Min Voltage HP)  HP stops after 5 minutes delay, set from D22 (PV Min Time)

Note: If water set point temperature is achieved then the heat pump stops operation.

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

0

10

20

30

40

50

60

70

80

90

00:00:00

00:01:10

00:02:20

00:03:30

00:04:40

00:05:50

00:07:00

00:08:10

00:09:20

00:10:30

00:11:40

00:12:50

00:14:00

00:15:10

00:16:20

00:17:30

00:18:40

00:19:50

00:21:00

00:22:10

00:23:20

00:24:30

00:25:40

00:26:50

00:28:00

00:29:10

00:30:20

00:31:30

00:32:40

00:33:50

00:35:00

00:36:10

00:37:20

00:38:30

00:39:40

00:40:50

00:42:00

00:43:10

00:44:20

00:45:30

00:46:40

00:47:50

00:49:00

00:50:10

00:51:20

00:52:30

00:53:40

00:54:50

00:56:00

00:57:10

00:58:20

00:59:30

01:00:40

01:01:50

Voltage

Temperature

Time

T3 T water top R3 Fan R4 HP R5 El heater V in (0-10V)

Fan Off

Fan On

HP Off

HP On

El H Off

El H On





 

Domestic Hot Water Heat Pump Service Manual

27

7.10.3 PV Storage operation in BOOST mode

When the photovoltaic mode is set to PV STORAGE and the DHW-HP mode is set to BOOST, the HP operates when the 0~10V input rises above the D20 (PV Min Voltage HP) and the electrical heater operates when the 0~10V input rises above the D21 (PV Min Voltage EL) set point.

 0~10V input raised in small steps until >5V, set from D20 (PV Min Voltage HP)  HP starts after 5 minutes delay, set from D22 (PV Min Time)  0~10V input raised in small steps until >8V, set from D21 (PV Min Voltage EL)  EL starts after 5 minutes delay, set from D22 (PV Min Time)  0~10V input decreased until <8V, set from D20 (PV Min Voltage HP)  EL stops after 5 minutes delay, set from D22 (PV Min Time)  0~10V input decreased until <5V, set from D20 (PV Min Voltage HP)  HP stops after 5 minutes delay, set from D22 (PV Min Time)

Note: If water set point temperature is achieved then the heat pump stops operation.

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

0

10

20

30

40

50

60

70

80

90

00:00:00

00:01:10

00:02:20

00:03:30

00:04:40

00:05:50

00:07:00

00:08:10

00:09:20

00:10:30

00:11:40

00:12:50

00:14:00

00:15:10

00:16:20

00:17:30

00:18:40

00:19:50

00:21:00

00:22:10

00:23:20

00:24:30

00:25:40

00:26:50

00:28:00

00:29:10

00:30:20

00:31:30

00:32:40

00:33:50

00:35:00

00:36:10

00:37:20

00:38:30

00:39:40

00:40:50

00:42:00

00:43:10

00:44:20

00:45:30

00:46:40

00:47:50

00:49:00

00:50:10

00:51:20

00:52:30

00:53:40

00:54:50

00:56:00

00:57:10

00:58:20

00:59:30

01:00:40

01:01:50

Voltage

Temperature

Time

T3 T water top R3 Fan R4 HP R5 El heater V in (0-10V)

Fan Off

Fan On

HP Off

HP On

El H Off

El H On





 

  

Domestic Hot Water Heat Pump Service Manual

28

7.11 D26 Extra Function (Only available with the deluxe DHW-HP)

There are 3 additional modes available for the Deluxe model DHW-HP, solar, floor heating and cooling functions. These are activated from D26 Extra Function accessed within the Installer menu.

NOTE: It is only possible to connect one of these options to the DHW-HP at any time.

Code

Set point name

Description

Range

Factory setting

D26

Extra function

The desired extra function is selected here. The possible functions are Solar, Floor or Cooling. Once the function is activated, move to the function menu and adjust the set point as desired.

OFF/ Solar/ Floor/ Cooling

OFF

7.11.01 B6 Solar

The Solar function allows the water to be heated up by the solar collector, activating a water pump controlled by the extra relay (GP1).

The setup of the solar function is carried out using the function menu and B6 (Solar)

Code

Set point name

Description

Range

Factory setting

B6

Solar

The Solar function allows the water to be heated up by the solar collector, activating a water pump controlled by the extra relay (GP1). The pump starts when BT5 > BT3 + D24 (Solar DT min). The pump stops if the temperature in the tank goes above D23 (Solar T max) or if BT5 is below BT3.

OFF/ON

OFF

The following schematic shows the electrical connections for the Solar Thermal operation

BLU B (D-)

N

L

0V

L

L 0V

0~10V

Input

BT3

EB1

0V0V0V

FM

BT2

BT1

0V

L

N

PE

230VAC ~ 50Hz

0V A (D+)

0V BLU 0~10V PWM

YEL

High pressure switch.

Compressor STOP when

Pd ≥ 2.0MPa

Solenoid valve.

Solenoid ON for 2 min

before compressor

starts and during

system defrost

BRN

BLK

N

BLU

BLK

BRN

BLU

Solar

Thermal

BT5

BT4

Domestic Hot Water Heat Pump Service Manual

29

7.11.02 B7 Floor / B8 Floor T

The floor heating function activates an external circulation pump, controlled by the extra relay (GP1) The setup of the floor heating function is carried out using the function menu and B7 (Floor) & B8 (Floor T)

Code

Set point name

Description

Range

Factory setting

B7

Floor

If the temperature at the bottom of the tank BT4 (T water b) is higher than the setting menu D25 (Floor T start) the floor heating function is activated. If the extra temperature BT5 (T Extra) is higher than the floor heating temperature (B8 T floor) the circulation pump (Extra relay GP1) stops.

OFF/ON

OFF B8

Floor T

The desired floor heating temperature in °C with hysteresis of 1K.

15 - 40

35

The following schematic shows the electrical connections for the underfloor heating operation

ON

OFF

PUMP

22

2112292330

Tank Temperature °C

Floor Temperature °C

T4: Temperature Tank Bottom Control T5: Floor Temperature

Based on following set conditions Installer menu D24: Floor Set Start = 30°C (T4) D26: Extra Function = Floor Function menu B7: Floor = ON B8: Floor Temp = 22°C (T5)

BLU B (D-)

N

L

0V

L

L 0V

0~10V

Input

BT3

EB1

Room Temperature

0V0V0V

FM

BT2

BT1

0V

L

N

PE

230VAC ~ 50Hz

0V A (D+)

0V BLU 0~10V PWM

YEL

High pressure switch.

Compressor STOP when

Pd ≥ 2.0MPa

Solenoid valve.

Solenoid ON for 2 min

before compressor

starts and during

system defrost

BRN

BLK

N

BLU

BLK

BRN

BLU

BT5

BT4

Domestic Hot Water Heat Pump Service Manual

30

7.11.03 B9 Cooling / B10 Cooling T

The cooling function activates a three-way damper, which directs the cold exhaust air to a room with cooling requirements. The two functions operate the damper in opposite directions. The Cooling function allows an area to be cooled up by the DHW-HP exhaust air, activating a damper motor controlled by the extra relay (GP1). The setup of the cooling function is carried out using the function menu B9 (Cooling) & B8 (Cooling T) and installer menu D28 m(Cooling type)

Code

Set point name

Description

Range

Factory setting

B9

Cooling

The Cooling function can be activated. See installer menu D28 (Cooling type).

OFF/ON

OFF

B10

Cooling T

The air temperature set point (°C) below which the heat pump stops, when the unit is in the Cooling function.

10 - 30

21

D28

Cooling 1

The fan and heat pump run until the additional temperature sensor, BT5, placed in the room environment is below a certain level. The water temperature can only reach the maximum temperature allowed in the tank D33 (T HP max). The cooling function activates a three-way damper, which directs the cold exhaust air to a room with cooling requirements. The two functions operate the damper in opposite directions

Cooling1 / Cooling2

Cooling1

Cooling 2

Cooling 1 (2). If BT5 is higher than B10 T Cooling, the extra relay that operates the damper (GP1) switches ON (OFF).

If BT5 is lower than B10 (T Cooling), the extra relay that operate the damper (GP1) switches OFF (ON).

The following schematic shows the electrical connections for the cooling operation

BLU B (D-)

N

L

0V

L

L 0V

0~10V

Input

BT3

EB1

0V0V0V

FM

BT2

BT1

0V

L

N

PE

230VAC ~ 50Hz

0V A (D+)

0V BLU 0~10V PWM

YEL

High pressure switch.

Compressor STOP when

Pd ≥ 2.0MPa

Solenoid valve.

Solenoid ON for 2 min

before compressor

starts and during

system defrost

BRN

BLK

N

BLU

BLK

BRN

BLU

BT5

Underfloor

heating

or

Cooling

Room

temperature

BT4

Domestic Hot Water Heat Pump Service Manual

31

7.12 D27 SG Ready

A smart grid is an electrical grid which includes a variety of operational and energy measures including smart meters, smart appliances, renewable energy resources, and energy efficient resources. Electronic power conditioning and control of the production and distribution of electricity are important aspects of the smart grid.

The DHW-HP is controlled based on inputs received from the Smart Grid energy meter on QA1and set up using installer menu D27.

Code

Set point name

Description

Range

Factory setting

D27

SG Ready

The SG ready function can be activated by the installer here. Three possible modes can be selected. This function allows the start of the heat pump from an external access (See QA1).

OFF

The heat pump and electric heater must start, if below the max water temperature allowed in the tank. Both Heat Pump and Electric heater are forced to operate (SG1 ON and SG2 ON).

SG BOOST

The heat pump operates minimizing costs, only the heat pump is activated (SG1 OFF, SG2 ON).

SG ECO

The unit can be stopped even if there is a need for hot water (SG1 ON, SG2 OFF).

SG BLOCK

OFF

<53

19

ON

T Extra Temperature °C Tank T °C

25

21

HP Operation

20

65

53

DHW

Set Point

>53

OFF

Aux

ON

T3:Temperature Tank Top T5: Temperature Extra (Room) Cooling Type 1 Cooling temperature set point 20°C

Note: If DHW temperature is greater than Auto set point (>53°C)

then HP OFF when Cool satisfied If cooling demand during this time then HP start at 65°C set point

CAUTION: DHW temperature could be hot 60°C

DHW AUTO mode set point of 53°C

Tank T °C

T Extra Temperature °C

252120

DHW

Set Point

Aux

OFF

65

ON

53

19

HP Operation

<53

ON

>53

OFF

T3:Temperature Tank Top T5: Temperature Extra (Room) Cooling Type 2 Cooling temperature set point 20°C

Note: If DHW temperature is greater than Auto set point (>53°C)

then HP OFF when Cool satisfied If cooling demand during this time then HP start at 65°C set point

CAUTION: DHW temperature could be hot 60°C

DHW AUTO mode set point of 53°C

Domestic Hot Water Heat Pump Service Manual

32

The following schematic shows the electrical connections for the SG Ready operation

BLU B (D-)

N

L

0V

L

L 0V

0~10V

Input

BT3

EB1

Energy Meter

Communication to / from power grid

SG2

SG1

0V0V0V0V0V

FM

BT2

BT1

0V

L

N

PE

230VAC ~ 50Hz

0V A (D+)

0V BLU 0~10V PWM

YEL

High pressure switch.

Compressor STOP when

Pd ≥ 2.0MPa

Solenoid valve.

Solenoid ON for 2 min

before compressor

starts and during

system defrost

BRN

BLK

N

BLU

BLK

BRN

BLU

#2

TB1: DC/AC Inverter BU: Energy meter E1-2-3: Electric loads WG1: Heat pump power supply GC1: Photovoltaic function

input signal (0-10 VDC 03 VDC, 4-20 mA).

____: represents the cables to

the switch inputs SG1 & SG2

E1

E2

E3

BU - Smart Grid

Energy Meter

GC1

WG1

TB1 From the Grid

SG1

SG2

TOSHIBA

Domestic Hot Water Heat Pump Service Manual

33

 DHW-HP normal operation  SB Block – SG switch positions: SG1 ON, SG2 Off – DHW-HP stops operation  SG Boost – SG switch positions; SG1 On, SG2 On – DHW-HP operates with HP & EL Heater  SG Eco – SG Switch positions; SG1 Off, SG2 On – DHW-HP operates with HP only  When DHW-HP reaches mode set point (AUTO mode = 53.5°C), DHW-HP stops operation

7.13 D29 External control

This function allows for the external control of the ventilation function using a 0 ~ 10 Volt input. Using the installer menu, D29 (External control) function.

Code

Set point name

Description

Range

Factory setting

D29

OFF

Normal operation.

OFF/ Hygrostat/ Ventilation Max/ Start-Stop

OFF

Hygrostat

The fan always runs according to the input signal in GC1 (0-10V) from an external hygrostat, CO2 – sensor or similar appliances.

1. If the voltage is between 0-3.0V the fan speed id D5 (Fan min speed)

2. If the voltage is between 3.0-8.0V the fan speed is D4 (Fan medium speed)

3. If the voltage is higher than 8V the fan speed is D3 (Fan max speed)

Ventilation max

If the ventilation function is already selected,

a signal higher of 2V to GC1 leads to maximum air flow.

Start/ Stop

If GC1 receives a signal higher than 2V, the unit operation is stopped.

0

20

40

60

80

100

120

11:56:00

11:59:00

12:02:00

12:05:00

12:08:00

12:11:00

12:14:00

12:17:00

12:20:00

12:23:00

12:26:00

12:29:00

12:32:00

12:35:00

12:38:00

12:41:00

12:44:00

12:47:00

12:50:00

12:53:00

12:56:00

12:59:00

13:02:00

13:05:00

13:08:00

13:11:00

13:14:00

13:17:00

13:20:00

13:23:00

13:26:00

13:29:00

13:32:00

13:35:00

13:38:00

13:41:00

13:44:00

13:47:00

13:50:00

13:53:00

13:56:00

13:59:00

14:02:00

14:05:00

14:08:00

14:11:00

14:14:00

14:17:00

14:20:00

14:23:00

14:26:00

14:29:00

T3 T water top R4 HP R5 El Heate r

SG1 input SG2 input SG state

HP_OnTemp HP_OffTemp

HP Off

HP On

EL Off

EL On

SG1 Off

SG1 On

SG2 Off

SG2 On

SG Off

SG Block

SG1 Eco

SG1 Boost

    

Domestic Hot Water Heat Pump Service Manual

34

Hygrostat Function – fan speed control The air flow is automatically adjusted depending on the ambient air conditions or by manual

adjustments. The fan constantly runs changing the speed level depending on the 0~10V input signal from

external humidity sensors, CO2 sensors or human interface panel:

 When the input signal is from 0 to 3.3V, the fan switches to minimum speed level (from D5)  When the input signal is from 3.3 to 8V, the fan switches to medium speed level (from D4)  When the input signal is from 8 to 10V, the fan switches to high speed level (from D3)

Humidity / CO2 Sensor

Human Interface

Humidity / CO2 Sensor

Receiver

Room 1

Room 2

BLU B (D-)

N

L

0V

L

L 0V

0~10V

Input

BT3

EB1

0V0V0V

FM

BT2

BT1

0V

L

N

PE

230VAC ~ 50Hz

0V A (D+)

0V BLU 0~10V PWM

YEL

High pressure switch.

Compressor STOP when

Pd ≥ 2.0MPa

Solenoid valve.

Solenoid ON for 2 min

before compressor

starts and during

system defrost

BRN

BLK

N

BLU

BLK

BRN

BLU

Domestic Hot Water Heat Pump Service Manual

35

7.14 Defrost operation

When the evaporation temperature (BT2) falls below 0°C, the evaporator starts to accumulate ice on its fins. In order to maintain the unit reliability and performance, an automatic defrosting operation is activated.

Defrosting can occur between 60 minutes and 120 minutes from the last defrosting or from the last moment in which the evaporation temperature was above 0°C.

Defrosting can occur with two different strategies according to the conditions of the inlet air.

1) If the air temperature is above 4°C, then the defrosting occurs running both compressor and fan. The fan runs at speed D3 (Fan max speed).

2) If the air temperature is below 4°C, then the defrosting occurs running the compressor and

stopping the fan.

Before defrosting is completed the fan stops for a short period to allow the excess water in the unit to leave the unit from the condensate drain.

Defrosting automatically stops when the temperature of the evaporator (BT2) becomes higher than the set point (D10).

-5

5

15

25

35

45

55

65

75

85

95

00:00:00

00:05:50

00:11:40

00:17:30

00:23:20

00:29:10

00:35:00

00:40:50

00:46:40

00:52:30

00:58:20

01:04:10

01:10:00

01:15:50

01:21:40

01:27:30

01:33:20

01:39:10

01:45:00

01:50:50

01:56:40

02:02:30

02:08:20

02:14:10

02:20:00

02:25:50

02:31:40

02:37:30

02:43:20

02:49:10

02:55:00

03:00:50

03:06:40

03:12:30

03:18:20

03:24:10

03:30:00

03:35:50

03:41:40

03:47:30

03:53:20

03:59:10

04:05:00

04:10:50

04:16:40

04:22:30

04:28:20

04:34:10

04:40:00

04:45:50

04:51:40

Temperature (°C)

T1 T air in T2 air out

T3 T water top FanSpeedSet

R2 Defrost DefrostState

Defrost Valve ON

Defrost Valve OFF

Defrost OFF

Defrost Timer

Defrost ON

Fan OFF

Fan Auto Speed

Fan Max Speed





 

 



Domestic Hot Water Heat Pump Service Manual

36

 System start up with BT1 (Air Inlet Temp) at 3°C  After 60 minute operation the defrost countdown timer is activated  After a further 60 minutes, the DHW-HP enters defrost operation

The solenoid valve opens and because the BT1 temperature is <4°C the compressor stays on

and the fan stops operation

 Defrost operation stops after a maximum time limit of 12 minutes or when BT2 (T Air Out),

evaporator temperature, becomes higher than the set point of D10 (Defrosting Temp Stop), factory set to 4°C.

 BT1 (Air Inlet Temp) raised to 4.2°C  After a further 60 minutes, the DHW-HP enters defrost operation

The solenoid valve opens and because the BT1 temperature is >4°C the compressor and fan

operate. The fan increases operation to Max Fan Speed, D3 (Fan Speed Max) set point.

 Defrost operation stops after a maximum time limit of 12 minutes or when BT2 (T Air Out),

evaporator temperature, becomes higher than the set point of D10 (Defrosting Temp Stop), factory set to 4°C.

7.15 Legionella operation

In order to prevent the possibility of legionella bacteria accumulating in the DHW-HP, a pasteurisation, or anti-legionella cycle, should be performed weekly.

Using the installer menu set up parameters D13 to D15 (detailed below). It is possible to select the day, temperature and to enable or disable the anti-legionella cycle.

The anti-legionella cycle is activated at midnight (00:00) on the day set (code D15) but the higher temperature is not activated until the next compressor start operation (DHW demand condition). Note:

i) If there is no DHW demand, and therefore no compressor start, within 24 hours of the anti-

legionella control becoming active the anti-legionella control is forced to start regardless of the water temperature inside the DHW-HP

ii) When the DHW-HP is set in HOLIDAY mode the anti-legionella control operates on the

selected day and starts the heat pump at 00:00.

Code

Set point name

Description Range

Factory setting

D13

Legionella

The legionella function can be activated. The legionella function does not switch the heat pump on, but just continues the heat up cycle to a higher temperature D14 (Legionella T). The legionella operation works only with the heat pump until 60°C. The remaining temperature lift is accomplished with the electric heater alone.

OFF/ON

OFF D14

Legionella Temp

The legionella temperature set point can be regulated. 60-65

60

D15

Legionella date

The legionella week day can be set

Monday/ Sunday

Sunday

Domestic Hot Water Heat Pump Service Manual

37

 Anti-legionella control activates at midnight (00:00). No operation of heat pump due to no

demand.

 Heat pump starts operation when demand is required and the HP off temperature is raised to

the legionella set point temperature, in this case D14 is set to standard factory setting of 60°C.

 Heat pump stops operation when legionella set point is achieved, 60°C.

0

10

20

30

40

50

60

70

80

90

100

16:08:00

16:29:20

16:50:40

17:12:00

17:33:20

17:54:40

18:16:00

18:37:20

18:58:40

19:20:00

19:41:20

20:02:40

20:24:00

20:45:20

21:06:40

21:28:00

21:49:20

22:10:40

22:32:00

22:53:20

23:14:40

23:36:00

23:57:20

00:18:40

00:40:00

01:01:20

01:22:40

01:44:00

02:05:20

02:26:40

02:48:00

03:09:20

03:30:40

03:52:00

04:13:20

04:34:40

04:56:00

05:17:20

05:38:40

06:00:00

06:21:20

06:42:40

07:04:00

07:25:20

07:46:40

08:08:00

08:29:20

08:50:40

09:12:00

09:33:20

09:54:40

10:16:00

10:37:20

10:58:40

Temperature

Time

T3 T water top R3 Fan R4 HP Legionella State HP_OffTemp

R3 Fan Off

R3 Fan On

R4 Comp Off

R4 Comp On

Legionella Off

Legionella On

R3 Fan Off

R3 Fan On

R4 Comp Off

R4 Comp On

Legionella Off

Legionella On

1

32

Domestic Hot Water Heat Pump Service Manual

38

8.0 Modbus

As standard the Toshiba Domestic Hot Water Heat Pump units are supplied with a ModBus controller. The controller provides a secondary port to be connected to a system network thanks to an RS485 bus. The controller has the ability to communicate without an amplifier. The length of the bus does not exceed 500m.

Description

Line

Spec.

Maximum

Length

(m)

Connection Destination

RS-485

connection

2 wire

shielded

500m

PCB WF1

Pin 1

A

+RS485

Pin 2

B

-RS485

The following schematic shows the electrical connections for the Modbus operation

BLU B (D-)

N

L

0V

L

L 0V

0~10V

Input

BT3

EB1

0V0V0V

FM

BT2

BT1

0V

L

N

PE

230VAC ~ 50Hz

0V A (D+)

0V BLU 0~10V PWM

YEL

High pressure switch.

Compressor STOP when

Pd ≥ 2.0MPa

Solenoid valve.

Solenoid ON for 2 min

before compressor

starts and during

system defrost

BRN

BLK

N

BLU

BLK

BRN

BLU

Modbus

communication

Domestic Hot Water Heat Pump Service Manual

39

ModBus should be set form the installer menu D2, see the table below:

Code

Set point

name

Description

Range

Factory setting

D2

Modbus

D2.1

Address

The Modbus address can be selected between 1 and 247

1 ~ 247

30

D2.2

Baud Rate

The Modbus baud rate can be selected or de-activated

9600 ~ 19200

19200

D2.3

Parity

The Modbus parity can be selected or de-activated

Even /

Odd /

OFF

Even

D2.4

Modify

If this function is activated, it is possible to modify the set points kept for development with a data logger

OFF / ON

OFF

Note: Stop bits are factory set to 1. ModBus can be accessed by means of the XB/WF1 connection and by the use of the micro-USB

connection on the front panel, located under the display surround. The factory settings are displayed in the table below.

Parameter

MODBUS

Via connector X8/WF1

MODBUS

via USB

Modbus Mode:

RTU

Baud rate:

19200 / 9600 (Default = 19200)

Data bits:

8

Parity:

Even / Odd / None (Default = Even)

Stop bits:

1

Modbus Address

1 ~ 247 (Default = 30)

Only 30

ModBus has 2 control levels. The first control level is used for monitoring functions only and the second can be used for reading or writing data depending on the status of installer menu parameter D2.4 ModBus Modify. This parameter can only be changed by using the controller on the front of the DHW-HP.

Domestic Hot Water Heat Pump Service Manual

40

8.1 Monitoring Functions

Modbus

Code

Parameter

Format

Unit

Modbus

Code

Parameter

Format

Unit

3x0000

ADC value CH2

*1 - 3x0021

R3 Fan

*1

OFF/ON

3x0001

ADC value CH3

*1 - 3x0022

R4 HP

*1

OFF/ON

3x0002

ADC value CH4

*1 - 3x0023

R5 El Heater

*1

OFF/ON

3x0003

ADC value CH7

*1 - 3x0024

R6 Pressostat

*1

OFF/ON

3x0004

ADC value CH10

*1 - 3x0025

SG1 Input

*1

OFF/ON

3x0005

ADC value CH11

*1 - 3x0026

SG2 Input

*1

OFF/ON

3x0006

ADC value CH12

*1 - 3x0027

V in (0/3-10V)

*10

Volt

3x0007

ADC value CH13

*1 - 3x0028

Temperature avg air

*10

°C

3x0008

ADC value CH14

*1 - 3x0029

Temperature avg evap

*10

°C

3x0009

ADC value CH15

*1 - 3x0030

El Power

*100

-

3x0011

BT1 T air in

*10

°C

3x0031

Total power

*100

-

3x0012

BT2 T air out

*10

°C

3x0032

Heating C

*100

-

3x0013

BT3 T water top

*10

°C

3x0033

Water P

*100 - 3x0014

BT4 T water low

*10

°C

3x0035

BT1 Error

*1

OFF/ON

3x0015

BT5 T extra

*10

°C

3x0036

BT2 Error

*1

OFF/ON

3x0019

R1 Extra

*1

OFF/ON

3x0037

BT3 Error

*1

OFF/ON

3x0020

R2 Defrost

*1

OFF/ON

3x0038

BT4 Error

*1

OFF/ON

Modbus

Code

Parameter

Format

Unit

Modbus

Code

Parameter

Format

Unit

3x0039

BT5 Error

*1

OFF/ON

3x0058

Max Fan Speed At Start Up

*1

OFF/ON

3x0040

HP Error

*1

OFF/ON

3x0059

Compressor State

*1

OFF/ON

3x0041

Evaporator Error

*1

OFF/ON

3x0060

WP_State Timer

*1

Seconds

3x0042

Cold Evap Error

*1

OFF/ON

3x0061

Defrost Valve Off Timer

*1

Seconds

3x0043

Modbus Error

*1

OFF/ON

3x0062

Compressor On Timer

*1

Seconds

3x0044

Filter Error

*1

OFF/ON

3x0063

T without Defrost Cnt

*1

Seconds

3x0045

HotEvapError

*1

OFF/ON

3x0064

BT3 Stable Cnt

*1

Seconds

3x0047

Fan speed set

*100 % 3x0065

BT1 Stable Cnt

*1

Seconds

3x0048

HP_On temp

*10

°C

3x0066

Fan Stable Cnt

*1

Seconds

3x0049

HP_Off temp

*10

°C

3x0067

BT1 minus BT2 old

*10

°C

3x0050

HP_Released

*1

OFF/ON

3x0068

Defrost On Cnt

*1

Seconds

3x0051

E_Heat On Temp

*10

°C

3x0069

BT1 minus BT2 step

*1

3x0052

E_Heat Off Temp

*10

°C

3x0072

HP_Hours_Sec

*1

Seconds

3x0053

E_Heat Released Level

*1

OFF/ON

3x0073

El_Hours_Sec

*1

Seconds

3x0054

Cold Mode On

*1

OFF/ON

3x0074

Fan_Hours_Sec

*1

Seconds

3x0055

Hot Mode ON

*1

OFF/ON

3x0075

Back Up Mode Rest Time_sec

*1

Seconds

3x0056

Defrost State

*1

OFF/ON

3x0076

Hot On Rest Time_sec

*1

Seconds

3x0057

Defrost Fan Off

*1

OFF/ON

3x0077

Back Up Mode On Time_sec

*1

Seconds

Domestic Hot Water Heat Pump Service Manual

41

Modbus

Code

Parameter

Format

Unit

Modbus

Code

Parameter

Format

Unit

3x0077

Back Up Mode On Time_sec

*1

Seconds

3x0096

Optimal Release HP

*1

OFF/ON

3x0078

Filter On Time_sec

*1

Seconds

3x0097

Optimal EL ON

*1

OFF/ON

3x0079

Defrost Run Out Cnt

*1

Seconds

3x0098

Legionella State

*1

-

3x0081

BT1_Error Cnt

*1

Seconds

3x0099

Low Tariff On/Off

*1

3x0082

BT2_Error Cnt

*1

Seconds

3x0100

PV State

*1

Binary

3x0083

BT3_Error Cnt

*1

Seconds

3x0101

SG State

*1

3x0084

BT4_Error Cnt

*1

Seconds

3x0102

Cooling State

*1

3x0085

BT5_Error Cnt

*1

Seconds

3x0103

Extern Control State

*1

3x0086

Pressostat Error Cnt

*1

Seconds

3x0105

Power Fan

*1

3x0087

Evap Error Cnt

*1

Seconds

3x106

Power Compressor

*1 3x0088

Cold Evap Error Cnt

*1

Seconds

3x107

HPWe (Compressor + Fan)

*1 3x0089

Modbus Error Cnt

*1

Seconds

3x111

HPWe Acc Temp Debug

*1 3x0090

HotEvapErrorCnt

*1

Seconds

3x0112

El Acc Temp Debug

*1

3x0093

ErrorList

*1

Binary

3x0113

Water P Acc Temp Debug

*1

3x0095

Fan RPM

*1

RPM

3x0116

Password O K Cnt Down

*1

8.2 Read & write functions

Modbus

Code

Parameter

Read / Write

Modbus Modify

Data

Range

Value

Range

Format

Unit

D02.4 = 0

D02.4 = 1

4x0000

P Mode (0=AUTO 1=ECO 2=BOOST 3=BACKUP 4=SILENT 5=HOLIDAY)

R

R/W 0 ~ 5

*1

-

4x0001

D16.3 Low tariff weekday start hour #2

R

R/W - 0 ~ 23

*1

Hours

4x0002

D16.4 Low tariff weekday end hour #2

R

R/W - 0 ~ 23

*1

Hours

4x0003

D16.5 Low tariff weekday start hour #3

R

R/W - 0 ~ 23

*1

Hours

4x0004

D16.6 Low tariff weekday end hour #3

R

R/W - 0 ~ 23

*1

Hours

4x0005

D17.3 Low tariff weekend start hour #2

R

R/W - 0 ~ 23

*1

Hours

4x0006

D17.4 Low tariff weekend end hour #2

R

R/W - 0 ~ 23

*1

Hours

4x0007

Um8 R R/W - 0

*1

-

4x0008

A1 T Auto

R

R/W

500 ~ 650

50 ~ 65

*10

°C

4x0009

A2 T ECO

R

R/W

500 ~ 550

50 ~ 55

*10

°C

4x0010

A3 BOOST

R

R/W

500 ~ 650

50 ~ 65

*10

°C

4x0011

D17.5 Low tariff weekend start #3

R

R/W - 0 ~ 23

*1

Hours

4x0012

D17.6 Low tariff weekend end hour #3

R

R/W - 0 ~ 23

*1

Hours

4x0013

B01 Ventilation (0=OFF, 1=Single speed, 2=2xSpeed)

R

R/W - 0 ~ 2

*1

-

4x0014

B02 Ventilation Speed (0=Low, 1=Medium, 2=High)

R

R/W - 0 ~ 2

*1 - 4x0015

B03 Low tariff (0=OFF, 1=Standard, 2=EL Optimal 1, 3=EL Optimal 2)

R

R/W - 0 ~ 3

*1

OFF/ON

4x0016

B04 Hot on time

R

R/W - 0 ~ 30

*1

Days

4x0017

B05 PV (0=OFF, 1=ECO, 2=STORAGE)

R

R/W - 0 ~ 2

*1

-

4x0018

B06 Solar 1( = ON)

R

R/W - 0 ~ 1

*1

OFF/ON

Domestic Hot Water Heat Pump Service Manual

42

Modbus

Code

Parameter

Read / Write

Modbus Modify

Data

Range

Value

Range

Format

Unit

D02.4 = 0

D02.4 = 1

4x0019

B07 Floor (1 = ON)

R

R/W - 0 ~ 1

*1

OFF/ON

4x0020

B08 Floor temperature

R

R/W

50 ~ 500

5 ~ 50

*10

°C

4x0021

B09 Cooling (1 = ON)

R

R/W - 0 ~ 1

*1

OFF/ON

4x0022

B10 Cooling temperature

R

R/W

100 ~ 300

10 ~ 30

*10

°C

4x0023

Um24 R R/W - 0

*1 4x0024

Sm1 R R/W - 0

*1

4x0025

C0 Reset (1 = Reset)

R

R/W - 0 ~ 1

*1

NO/YES

4x0026

C1.1 Model

R R -

0 ~ 65535

*1

Seconds

4x0027

C1.2 Software

R R 0 ~ 65530

0 ~ 6553

*10

Seconds

4x0028

C1.3 Version

R R -

0 ~ 65535

*1 - 4x0029

C2.1 Hour

R

R/W - 0 ~ 23

*1

Hours

4x0030

C2.2 Minutes

R

R/W

-

0 ~ 23

*1

Minutes

4x0031

C3.1 Date

R

R/W - 0 ~ 31

*1

Days

4x0032

C3.2 Month

R

R/W - 0 ~ 12

*1

Month

4x0033

C3.3 Year

R

R/W - 0 ~ 99

*1

Year

4x0034

C4 Day (1=Monday 7=Sunday)

R

R/W - 1 ~ 7

*1

DoW

4x0035

C5 Language (0=UK, 1=DE, 2=FR, 3=DK, 4=NL, 5=PL, 6=ITA)

R

R/W - 0 ~ 6

*1

-

4x0036

C6 Contrast

R

R/W - 0 ~ 8

*1

-

4x0038

D0 Reset All (1 = Reset)

R

R/W - 0 ~ 1

*1

NO/YES

4x0039

D02.1 Modbus address

R

R/W - 0 ~ 247

*1

-

4x0040

D02.2 Modbus baud rate (0=9600 1=19200)

R

R/W - 0 ~ 1

*1

4x0041

D02.3 Modbus parity (0=None 1=Even 2=Odd)

R

R/W - 0 ~ 2

*1

4x0042

D02.4 Modbus modify (0=Write Disabled)

R

R/W - 0 ~ 1

*1

OFF/ON

4x0043

D03 Ventilation min speed

R

R/W - 0 ~ 100

*1

%

4x0044

D05 Ventilation max speed

R

R/W - 0 ~ 100

*1

%

4x0045

D06 AUTO speed

R

R/W - 0 ~ 100

*1

%

4x0046

D07 Air Temperature max

R

R/W

-70 ~ 100

-7 ~ 10

*10

°C

4x0047

D08 Air temperature min

R

R/W

300 ~ 400

30 ~ 40

*10

°C

4x0048

D09 Water temperature max

R

R/W

550 ~ 650

55 ~ 65

*10

°C

4x0049

D10 Defrosting temperature stop

R

R/W

0 ~ 100

0 ~ 10

*10

°C

4x0050

D11 Evaporator temperature max

R

R/W

100 ~ 400

10 ~ 40

*10

°C

4x0051

D12 Temperature Backup

R

R/W

0 ~ 650

0 ~ 65

*10

°C

4x0052

D13 Legionella (1 = ON)

R

R/W - 0 ~ 1

*1

OFF/ON

4x0053

D14 Legionella temperature

R

R/W

600 ~ 650

60 ~ 65

*10

°C

4x0054

D15 Legionella date (1=Monday 7=Sunday)

R

R/W - 1 ~ 7

*1

Day

4x0055

D16 Forced operation (1 = ON)

R

R/W - 0 ~ 1

*1

OFF/ON

4x0056

D17.1 Low tariff weekday start hour #1

R

R/W - 0 ~ 23

*1

Hour

4x0057

D17.2 Low tariff weekday end hour #1

R

R/W - 0 ~ 23

*1

Hour

4x0058

D18.1 Low tariff weekend start hour #1

R

R/W - 0 ~ 23

*1

Hour

4x0059

D18.2 Low tariff weekend end hour #1

R

R/W - 0 ~ 23

*1

Hour

4x0060

D04 Ventilation medium speed

R

R/W - 0 ~ 100

*1

%

4x0061

D19 Daylight saving (1 = ON)

R

R/W - 0 ~ 1

*1

OFF/ON

4x0062

D20 PV voltage HP

R

R/W

0 ~ 100

0 ~ 10

*10

Volt

4x0063

D21 PV voltage EL

R

R/W

0 ~ 100

0 ~ 10

*10

Volt

Domestic Hot Water Heat Pump Service Manual

43

Modbus

Code

Parameter

Read / Write

Modbus Modify

Data

Range

Value

Range

Format

Unit

D02.4 = 0

D02.4 = 1

4x0064

D22 PV min time

R

R/W - 1 ~ 120

*1

Minutes

4x0065

D23 Solar temperature max

R

R/W

550 ~ 890

55 ~ 89

*10

°C

4x0066

D24 Solar DT min

R

R/W

10 ~ 50

1 ~ 5

*10

°C

4x0067

D25 Floor temperature start

R

R/W

250 ~ 450

25 ~ 45

*10

°C

4x0068

D26 Extra function (0=OFF 1=Solar 2=Floor 3=Cooling)

R

R/W - 0 ~ 3

*1 - 4x0069

D27 SG ready (1 = ON)

R

R/W - 0 ~ 1

*1

OFF/ON

4x0070

D28 Cooling type (0=Normal 1=Inverted)

R

R/W - 0 ~ 1

*1

OFF/ON

4x0071

D29 External control (0=OFF 1=Hygrostat 2=Max 3=ON/OFF)

R

R/W - 0 ~ 3

*1

-

4x0072

D30 Filter timer

R

R/W - 0 ~ 1

*1

OFF/ON

4x0073

D31 Filter interval

R

R/W - 1 ~ 9

*1

Months

4x0074

D32 Filter reset (1 = YES)

R

R/W - 0 ~ 1

*1

NO/YES

4x0075

D33 Temperature HP max

R

R/W

500 ~ 650

50 ~ 65

*10

°C

4x0081

M01 Minimum time defrosting

R

R/W - 0 ~ 999

*1

Minutes

4x0082

M02 Timer 1

R

R/W - 0 ~ 999

*1

Minutes

4x0083

M03 max interval defrosting

R

R/W - 0 ~ 999

*1

Minutes

4x0084

M04 Admitted variation defrosting

R

R/W

0 ~ 100

0 ~ 10

*10

°C

4x0085

M05 Delta T defrosting min

R

R/W

0 ~ 100

0 ~ 10

*10

°C

4x0086

M06 Fan defrosting temperature

R

R/W

-50 ~ 150

-5 ~ 15

*10

°C

4x0087

M07 Max time defrosting

R

R/W - 0 ~ 30

*1

Minutes

4x0088

M08 Temperature water for max fan

R

R/W

0 ~ 1000

0 ~ 100

*10

°C

4x0089

M09 Delta T heat on

R

R/W

10 ~ 100

1 ~ 10

*10

°C

4x0090

M10 Password

R

R/W

-

0 ~ 65535

*1

-

4x0091

M11 Reset event log (1 = YES)

R

R/W - 0 ~ 1

*1

NO/YES

4x0092

M12 Save restore set points (1=Restore 2=Save)

R

R/W - 0 ~ 2

*1 4x0096

HP MWHe

R

R/W

-

0 ~ 65535

*1

-

4x0097

HP MWHt

R

R/W

-

0 ~ 65535

*1

-

4x0098

EL MWHe

R

R/W

-

0 ~ 65535

*1

-

4x0099

EL Start / Stops

R

R/W

-

0 ~ 65535

*1 - 4x0100

E2 HP hours (2 hours)

R

R/W

-

0 ~ 65535

*1

-

4x0101

E3 EL hours (2 hours)

R

R/W

-

0 ~ 65535

*1 - 4x0102

E4 Fan hours (2 hours)

R

R/W

-

0 ~ 65535

*1 - 4x0103

Back up mode rest time

R

R/W

-

0 ~ 65535

*1

-

4x0104

Hot on rest time

R

R/W

-

0 ~ 65535

*1 - 4x0105

Power on count

R

R/W

-

0 ~ 65535

*1 - 4x0106

Back up mode on time

R

R/W

-

0 ~ 65535

*1

-

4x107

Filter (2 hours)

R

R/W

-

0 ~ 65535

*1 - 4x0115

Last Legionella (date / month)

R

R/W

-

0 ~ 65535

*1

-

Domestic Hot Water Heat Pump Service Manual

44

9.0 Method of defect analysis

9.1 Matters to be confirmed first

In addition check out the following questions before contacting an installer

• Is the cold water supply open?

• Has the periodic cleaning of evaporator, condensation drain and fan as described in the

maintenance section been followed?

• Has any of the safety features disengaged the heat pump/electrical emersion heater?

• Has external short-circuiting of terminals disengaged the heat pump?

• Has factory resetting been tested?

• If it is not one of the above errors, please contact;

In the warranty period (0-2 years): The distributor, from which the unit was purchased. After the warranty period (> 2 years): The distributor from which the unit was purchased or partners of the manufacturer

Please have data from name plate ready (silver plate on the unit).

Problem Possible reasons Possible Solution

The product does not supply hot water

The unit is not connected to the power supply

Make sure the display turns ON

Alarms from the controller stop the operation of the unit

Check the alarms in the Info menu Er

Low water temperature set points

Increase all temperature set points in menu A Temperatures Low airflow in evaporator

Clean the evaporator and the air ducts

Fan does not work

Make sure that the fan is connected to the PCB or substitute the component.

SG Ready function is active

Switch OFF SG Ready function

Thermal safety switch FN1 opens and stops the power supply to the electric heater

Restore the original conditions of the thermal safety switch FN1.

High sound emissions

Too high maximum fan speed

Reduce the fan maximum speed in the Installer menu

Activate the SILENT mode

Obstruction of the air ducts.

Remove the obstruction

Dirt on fan or evaporator.

Clean the evaporator and the fan. Do not use cleaning spray that can be damage the EPS housing

Components vibration

Make sure all components as compressor and solenoid valve are well fastened

9.1.1 Check the supply voltage

Ensure the power is switched on and the display is on and that the voltage is correct, the voltage should be between 220VAC & 240VAC

Note: For the Deluxe model an extreme low voltage may result in the DHW-HP running as a

Standard unit.

9.1.2 Check the cold water supply

Ensure the cold water feed is turned on and there is water flow. Note: If the unit is low on water or has been switched off: turn on the water supply and bleed the

DHW-HP by opening a tap at the furthest point from the unit to ‘bleed’ the system.

Domestic Hot Water Heat Pump Service Manual

45

9.2 In the event of an error – how to operate BACK-UP mode

In the event of an error occurring it is possible to produce domestic hot water by operating the DHW-HP in Back-Up mode, for more information see section 7.4. If Yes is selected the unit operates at the lower set point set by D12 (BACK-UP Temp)

Note: The Back-up mode uses the electric heater only to heat a smaller volume of water to set point. In the 190l tank this is 80l and in the 260l tank this is 130l.

Code

Set point name

Description

Range

Factory setting

D12

BACKUP Temp

The water temperature at which the unit stops the backup mode with only the electric heater.

0-65

35

9.3 Error codes

The following error codes are shown on the remote controller LCD screen at the time of a fault.

Class

Code

Menu Item

Description

Er

Er1

BT1 Error

The temperature sensor BT1 is out of range

Er2

BT2 Error

The temperature sensor BT2 is out of range

Er3

BT3 Error

The temperature sensor BT3 is out of range. If BT3 Error occurs, the unit does not heat the water in any way

Er4

BT4 Error*

The temperature sensor BT4 is out of range. The error Er4 is ignored and the unit runs normally

Er5

BT5 Error*

The temperature sensor BT5 is out of range. The error Er5 is ignored and the unit runs normally

Er6

Err HP

The pressure switch opens, when the pressure in the heating circuit is above the limit of pressure specified on the high pressure switch

Er7

Err Evap

The temperature sensor BT2 is above BT1 - 2°C for more than one hour

Er8

Err C Evap

The temperature BT2 is below - 25°C

Er9

Err H Evap

The temperature BT2 is above D11 (Evaporator T max)

Er10

Filter

Replace filter. The alarm is displayed on the main screen, but the operation of the unit is not affected.

9.4 Error Code Analysis

Alarm Meaning Possible reasons Possible solutions

Er1, Er2, Er3, Er4, Er5

Temperature sensors out of range

The temperature sensor BT1, BT2, BT3, BT4 or BT5 is defective or not connected to the PCB

Check that the sensor is connected to the PCB

Substitute the temperature sensor

Er- Err HP

High pressure switch High pressure in the heating system

Reduce the water temperature set point Reduce the fan maximum speed in the installer

High pressure switch BP1 is defective or not connected to the PCB

Substitute component

Er 7 - Err Evap / Er9 - Err H Evap

High evaporator temperature

Wrong position of the temperature sensor

Check that BT2 is positioned in the evaporator Leakage of refrigerant

Fix leakages and charge refrigerant

Er- Err C Evap

Low evaporation temperature

Mal-functioning fan

Make sure that the fan is connected to the PCB or substitute the component

Low air flow

Increase the minimum fan speed in the installer menu

Low air inlet temperature BT1

Increase the minimum air temperature in the installer menu

Er10 Filter

Change filter

Substitute the air filter

Domestic Hot Water Heat Pump Service Manual

46

9.4.1 Er1 ~ Er5 – Temperature sensor error analysis

Temperature sensor errors occur if: The measured temperature is < -29 or >129 If the sensor is disconnected form the PCB, the measured value will be -30, so an error will occur. The DHWHP operation is interrupted and the error is displayed only for BBT1, BBT2 and BBT3.

9.4.2 Er HP – High pressure switch error analysis

An error occurs if the gauge pressure in the refrigerant circuit reaches a value of 20bar

Is the BT temperature sensor(s) positioned and connected correctly?

No

Yes

Is the sensor(s)

correctly

positioned?

No

Move sensor(s) into correct position

Is the sensor(s) connected to the PC board?

No

Connect sensor(s) to the PC board

Is the BT temperature sensor(s) characteristics correct?

Yes

Check PC board and replace if defective

Is the fan motor operating correctly?

No

Yes

Is the fan motor

connected to

the PC board?

No

Connect fan motor to PC board

Does the fan motor turn?

No

Replace the fan motor

Does the high pressure switch automatically reset when DHWHP stops?

No

Replace the high pressure switch

Yes

Is the water temperature set too high?

No

Lower the water set point temperature

Yes

Check PC board and replace if defective

Does the high pressure switch automatically reset when DHWHP stops?

No

Replace the high pressure switch

Yes

Is the fan speed set too high?

No

Reduce the fan speed

No

Replace the BT temperature sensor

Domestic Hot Water Heat Pump Service Manual

47

9.4.3 Er Evap – Evaporator temperature error analysis

Er Evap is activated in the case of a possible leak in refrigerant; the control is activated if: BBT2>BBT1 -2k

The compressor is ON The duration of the temperature difference is longer than one hour.

9.4.4 Er H Evap – High evaporator temperature error analysis

Er H Evap (high evaporator temperature) is activated under the following conditions: Compressor in ON

BBT2 > Evaporator Temperature Max (D11 Evaporator temp max, factory setting 30°C) The control is active 10 minutes after compressor starts and is activated after 5 minutes.

Are the BBT1 & BT2 sensors operating correctly with no defects?

No

Complete steps

from 8.4.1

Is there a lack of refrigerant?

Yes

Check for leaks.

Recharge with refrigerant.

Are the BBT1 & BT2 sensors operating correctly with no defects?

No

Complete steps

from 8.4.1

Is there a lack of refrigerant?

Yes

Check for leaks.

Recharge with refrigerant.

Domestic Hot Water Heat Pump Service Manual

48

9.4.5 Er C Evap – Low evaporator temperature error analysis

The Low evaporation temperature error occurs if:

-29 < BBT2 < -25

9.4.6 Er Filter – Change filter error analysis

Filter error occurs if D30 (Filter Timer) is ON and the time of the D31 (Filter Timer Time) has elapsed since the last time the filter timer has been reset in D32 (Filter Reset).

9.5 Resetting of error code & BACK-UP mode

Once the cause of the error has been corrected or a repair has been completed the DHW-HP can be reset to normal operation.

To reset the error code a power cycle musty be established. Switch the electrical supply to the DHW-HP OFF and then back ON after approximately 30 seconds.

Once the power has been reset, using the Up & Down arrow buttons on the remote controller, select the operation mode required, i.e. AUTO mode.

The unit should now operate correctly.

The filter timer has elapsed Yes

Replace or clean

filters

Is the fan motor operating correctly?

No

Yes

Is the fan motor

connected to

the PC board?

No

Connect fan motor to PC board

Does the fan motor turn?

No

Replace the fan motor

Is the fan speed set too high?

No

Reduce the fan speed

Is the BT temperature sensor(s) positioned and connected correctly?

No

Yes

Is the sensor(s)

correctly

positioned?

No

Move sensor(s) into correct position

Is the sensor(s) connected to the PC board?

No

Connect sensor(s) to the PC board

Are the BBT1 & BT2 sensors operating correctly with no defects?

No

Complete steps

from 8.4.1

Yes

Is the inlet temperature too low

Yes

Increase the minimum air

temperature from

D7

Domestic Hot Water Heat Pump Service Manual

49

10.0 DHW-HP settings

10.1 Home view

The unit can be controlled from the control panel described in Figure 17. From the home view, all the main operational modes, functions, set points and information on the unit can be accessed.

1: Electric heating state (ON/OFF) 2: Main menu (Can be open by pressing ) 3: OK/Enter

4: Mode (Change with or )

5: Scroll down 6: Scroll up 7: Return back 8: Information (open with ) 9: Temperature set point 10: Heat pump operation (Heat pump, Ventilation, Defrosting) 11: Time

The top part of the screen gives information about the unit operation, time and temperature set point. This part is passive and it is changed automatically.

Domestic Hot Water Heat Pump Service Manual

50

The bottom part of the screen is active, meaning that the icon on the screen contains other menu items. This part is divided in three menus:

 INFORMATION MENU (8), that can be accessed by pressing ( )  MODE MENU (4), that can be accessed by pressing ( ) or ( )  MAIN MENU (2), that can be accessed by pressing ( )

The MAIN MENU is composed of 4 sub menus:

– Temperatures – Functions – General – Installer

 The menu items with * are optional functions.

9.1.1 Information Menu

The information menu can be opened pressing button ( ) from the home view. This menu gives all the operational information of the unit. The available information are divided in four groups:

• Temperatures (T)

• Collected data on the unit operation and performance (I)

• The state of the relays of the unit (R)

• The errors and alarms of the unit (Er)

All the information that can be shown in the information menu are described in the following table. All temperatures are in °C.

Class

Code

Menu Item

Description

T

BT1

T air i

The air temperature at the inlet of the unit

BT2

T air o

The evaporator temperature at the outlet of the unit

BT3

T water t

The water temperature at the top of the unit

BT4

T water b

The water temperature at the bottom of the unit

BT5

T extra

The temperature measured by the additional sensor

V V1

Fan %

The actual speed of the fan in %

V2

Input V

The actual input signal in GC1 (0-10V) from the PV or hygrostat in Volts

I

I1

HP hr

The total amount of hours that the compressor has been running

I2

EL hr

The total amount of hours that the electric heater has been running

I3

Fan hr

The total amount of hours that the fan has been running

I4

T Avg a

The average air temperature with operating unit is displayed in °C since last Reset All

I5

T Avg e

The average evaporator temperature with operating unit in °C since last Reset All

I6

HP ON

The number of START/STOPS for the entire unit life time since last Reset All

I7

W el

The calculated instantaneous electricity consumption in W since last Reset All

I8

MWh el

The total calculated electricity consumption in MWh since last Reset All

I9

W th

The calculated instantaneous heating capacity is displayed in W

Domestic Hot Water Heat Pump Service Manual

51

Class

Code

Menu Item

Description

I

I10

MWh th

The total calculated hot water production is displayed in MWh since last Reset All

I11

EL MWh

The electricity consumption of the electric resistance in MWh since last Reset All

R

R1

Extra

The operation of the extra relay, for example for the operation of a circulation

R2

Defrost

The operation of the relay that controls the solenoid valve for the defrosting function is shown

R3

Fan

The fan speed is shown in %

R4

HP

The operation of the compressor is shown

R5

EL

The electric heater operation is shown

Er

Er1

BT1 Error

The temperature sensor BT1 is out of range

Er2

BT2 Error

The temperature sensor BT2 is out of range

Er3

BT3 Error

The temperature sensor BT3 is out of range. If BT3 Error occurs, the unit does not heat the water in any way

Er4

BT4 Error

The temperature sensor BT4 is out of range. The error Er4 is ignored and the unit runs normally

Er5

BT5 Error

The temperature sensor BT5 is out of range. The error Er5 is ignored and the unit runs normally

Er6

Err HP

The pressure switch opens, when the pressure in the heating circuit is above the limit of pressure specified on the high pressure switch

Er7

Err Evap

The temperature sensor BT2 is above BT1 - 2°C for more than one hour Er8

Err C Evap

The temperature BT2 is below - 25°C

Er9

Err H Evap

The temperature BT2 is above D11 (Evaporator T max)

Er10

Filter

Replace filter. The alarm is displayed on the main screen, but the operation of the unit is not affected.

*Optional

10.1.2 Mode of operation

Different strategies to heat the water can be selected from the main control panel pressing 5 or 6 (Scroll down or scroll up) from the home view. The possible modes of operation to choose from are found in the following table:

Figure 18 – Modes of operation

Domestic Hot Water Heat Pump Service Manual

52

Code Set point name Description

P1

AUTO

The heat pump heats the water when required, normally using the heat pump operation. The unit starts when the water temperature BT3 is more than 5°C below A1 (T AUTO) and it stops when this temperature is reached. If the air temperature is out of the feasible limits, the water is heated with the electric heater.

P2

ECO

The heat pump consumes as low energy as possible The heat pump has a lower water temperature set point A2 (T ECO). The heat pump heats the water to a lower temperature compared to the other operations.

P3

BOOST

The heat pump and the electrical heater operate simultaneously when possible. The unit starts when the water temperature BT3 is more than 5 °C below A3 (T BOOST) and it stops when this temperature is reached. If A3 (T BOOST) is higher than D33 (T HP max) the compressor stops when the temperature D33 (T HP max) is reached. The remaining temperature lift is accomplished with only the electric heater.

P4

BACKUP

This is an emergency mode. When an error occurs, preventing the operation of the heat pump, the water cannot be heated. On the display the possibility to activate the BACKUP mode is asked to the user. In BACKUP mode the water is heated up by the electric heater at a lower temperature than the desired one. The Legionella control is active in any case. The unit starts when the water temperature BT3 is more than 5 °C below D13 (BACKUP T) and it stops when this temperature is reached.

P5

SILENT

The fan speed decreases to the minimum in order to minimize the sound emission of the unit in operation. The unit starts when the water temperature BT3 is more than 5 °C below BT1 (T AUTO) and it stops when this temperature is reached.

P6

HOLIDAY

The heat pump is turned off and only the LCD display is active. The heat pump does not start when water heating is required. The compressor is OFF except during LEGIONELLA control in which it can be activated. The HOLIDAY mode is connected to the Hot on time function B4 (Hot on time). After the HOLIDAY period is completed, the unit goes back to the previous mode of operation.

Note: the unit can be turned off switching to HOLIDAY mode.

10.1.3 Temperatures

Code

Set point name

Description

Range

Factory setting

A1

T AUTO

The temperature level at which the unit heats the water when the AUTO mode is selected. The unit starts if the temperature of the water in BT3 falls of 5 °C below the set point.

50 - 60

53 A2

T ECO

The temperature level at which the unit heats the water when the ECO mode is selected. The unit starts if the temperature of the water in BT3 falls of 5 °C below the set point.

50 - 55

50 A3

T BOOST

The temperature level at which the unit heats the water when the BOOST mode is selected. The unit starts if the temperature of the water in BT3 falls of 5 °C below the set point.

50 - 65

55

Domestic Hot Water Heat Pump Service Manual

53

10.1.4 Functions

The functions are similar to the modes of operation but they cannot be accessed directly from the home view and they can vary from unit to unit

In addition, since SOLAR, FLOOR and COOLING (called extra functions) cannot be used simultaneously, the choice of these functions should be made from the Installer menu (D26 Extra function). In the function menu, only one of these extra functions is normally shown.

The function menu is described in the following table.

Code

Set point name

Description

Range

Factory setting

B1

Ventilation OFF

The fan switches off when the heat pump does not run.

OFF/ Single Speed/ 2Speeds

OFF

Single speed

The fan is always running at a single fixed speed (B2 Fan speed), both when the heat pump is operating and when it is not.

2 Speeds

The fan is always in operation but it runs normally at a higher speed D6 (Fan AUTO Speed) when the heat pump starts operating and at (B2 Fan speed) when it is not operating.

B2

Fan speed

The main fan speed regulation for the ventilation function. There are three ventilation level that can be selected: LOW D5 (Min Fan Speed), MEDIUM D4 (Fan medium speed) HIGH D3 (Max fan speed).

LOW/ MEDIUM/ HIGH

HIGH

B3

Low Tariff Standard

The low tariff allows the electric heater and the heat pump to run only during periods with low electricity prices, according to the menu item that regulate the program of the low tariff D17/ D18 (Low tariff weekday/weekends). The unit runs only during pre-defined hours of the day.

OFF/ Standard/ Optimal 1/ Optimal 2

OFF

Low Tariff Optimal 1

This function allows the maximum exploitation of the lower electricity price during the night periods between 00:00 and 05:00

Low Tariff Optimal 2

This function allows the maximum exploitation of the lower electricity price during the night periods between 00:00 and 05:00.

During the day, the unit works according to Low Tariff periods D17 and D18

B4

Hot on time

The unit can be programmed to deliver hot water from 1 to 30 days from the moment in which the function is activated and the HOLIDAY mode is selected. The unit switches to AUTO MODE in the desired number of days. If OFF is selected, the function is not active.

OFF/ON

OFF

Domestic Hot Water Heat Pump Service Manual

54

Code

Set point name

Description

Range

Factory setting

B5

OFF

The PV function is not active. If this function is activated, the heat pump and the electric heater can start only if the input voltage in GC1 (0-10V) is higher than D20/D21 (PV min Voltage HP/EL) for longer than D22 (PV min time).

OFF /

ECO / STORAGE

ECO

PV ECO

The PV function allows for water heating only with the heat pump until temperature set point defined by the MODE of operation is reached.

PV STORAGE

The PV function allows for water heating to the maximum temperature level, giving priority to the operation of the heat pump if the BOOST or BACK UP mode is not active. The heat pump operates alone until the max allowed temperature for the heat pump operation D33 (T HP Max) is reached. The electric heater operates only from D33 to the maximum allowable temperature D9 (Water T max).

B6

Solar

The Solar function allows the water to be heated up by the solar collector, activating a water pump controlled by the extra relay (GP1). The pump starts when BT5 > BT3 + D24 (Solar DT min). The pump stops if the temperature in the tank goes above D23 (Solar T max) or if BT5 is below

OFF/ON

OFF

B7

Floor

The floor heating function activates an external circulation pump. If the temperature at the bottom of the tank BT4 (T water b) is higher than the setting menu D25 (Floor T start) the floor heating function is activated. If the extra temperature BT5 (T Extra) is higher than the floor heating temperature (B8 T floor) the circulation pump (Extra relay GP1) stops.

OFF/ON

OFF

B8

Floor T

The desired floor heating temperature in °C with hysteresis of 1K.

15 - 40

35

B9

Cooling

The Cooling function can be activated. See installer menu D28 (Cooling type).

OFF/ON

OFF

B10

Cooling T

The air temperature set point (°C) below which the heat pump stops, when the unit is in the Cooling function.

10 - 30

21

10.1.5 General

The general section collects all the standard settings that have little or no effect on the heat pump operation, except for the menu item Reset. Activating the Reset function brings all the set points to the factory settings value. The set

points of the General menu are described in the Table below

Code

Set point name

Description

Range

Factory setting

C0

Reset

The set points in the user menu are reset. The more advanced settings can be reset only from the installer menu.

The information as number of hours of the compressor and fan cannot be reset

OFF/ON

OFF

C1

Info

The software version is displayed

-

C2

Time

The time can be adjusted here

- - C3

Date

The date can be adjusted here

- - C4

Day

The day can be adjusted here

-

Monday

C5

Language

More languages can be selected here

-

English

C6

Contrast

The brightness of the screen can be adjusted here

0 – 10

5

Domestic Hot Water Heat Pump Service Manual

55

10.1.6 Installer

The installer menu should be accessed only by qualified personnel. Some of the set points that can be regulated from this menu can have large effects on the unit performance depending on the type of commissioning and installation. There should be a proper match between installer set points and type of installation in order to optimize the performance and lifetime of the unit.

In order to access the Installer Menu, a 4-digits password needs to be entered. The password is:

2016. All temperatures are expressed in °C.

Code

Set point name

Description

Range

Factory setting

D0

Reset all

All the set points are reset to original factory settings. Also the Information menu and the installer set points are modified.

OFF/ON

OFF D1

Errors

The alarms of the unit can be checked here.

-

D2

D2.0 Address

Modbus address. The Modbus address can be selected between 1 and 247.

1-247

30

D2.1 Baud Rate

Modbus baud rate. The ModBus baud rate can be selected between 19200 and 9600.

9600/ 19200

19200

D2.2 Parity

Modbus parity. The ModBus parity can be chosen between Even or Odd or deactivated.

Even/ Odd/

Even

D2.3 Write enable

Modbus modify. If this function is activated, it is possible to modify the set points kept for development with a data logger.

OFF/ON

ON

D3

Fan max speed

The maximum fan speed (%) can be regulated. This is the highest limit at which the fan can run both when the ventilation function is active and when the heat pump is in standard operation.

0-100

70 D4

Fan medium speed

The medium fan speed (%) can be adjusted. 0-100

50

D5

Fan min speed

The minimum fan speed (%) can be adjusted. 0-100

40

D6

AUTO speed

The automatic speed of the fan (%) when the heat pump is running in AUTO and ECO mode can be regulated. This is a nominal value while the fan speed may automatically vary its speed at a higher level, depending on the operating conditions.

0-100

57

D7

Air Temp min

The minimum air temperature allowed during the operation of the heat pump can be regulated here. If BT1 is below Air T min the electric heater starts and it works alone until the set point is reached. (Even if the air temperature increases in the meanwhile).

(-7) (+10)

-7 D8

Air Temp max

The maximum air temperature allowed during the operation of the heat pump can be regulated here.

30-40

40

D9

Water Temp max

The maximum allowed temperature in the tank. 55-65

65

D10

Defrosting Temp Stop

The temperature of BT2 at which the defrosting function stops. The defrosting function is automatic and it occurs not more often than once every hour.

0-10

4

D11

Evaporator Temp max

The maximum evaporator temperature allowed during the operation of the heat pump can be regulated here. If BT2 has a higher temperature than the set point, then use electric heater. This function is active 10 minutes after the compressor start.

10-40

30

Domestic Hot Water Heat Pump Service Manual

56

Code

Set point name

Description Range

Factory setting

D12

BACKUP Temp

The water temperature at which the unit stops the backup mode with only the electric heater.

0-65

35

D13

Legionella

The legionella function can be activated. The legionella function does not switch the heat pump on, but just continues the heat up cycle to a higher temperature D14 (Legionella T). The legionella operation works only with the heat pump until 60°C. The remaining temperature lift is accomplished with the electric heater alone.

OFF/ON

OFF D14

Legionella Temp

The legionella temperature set point can be regulated. 60-65

60

D15

Legionella date

The legionella week day can be set

Monday/ Sunday

Sunday

D16

Forced operation

The forced operation of the heat pump can be activated here. The heat pump starts even if there is no demand for hot water. When the maximum temperature allowed by the heat pump is reached the unit will stop. This function is to use for testing purposes. It becomes OFF again after one heat up cycle is completed.

OFF/ON

OFF D17

Low Tariff weekday

The start and stop time of the low electricity tariff period for weekdays. Three periods can be selected.

0-23 0-23 0-23

0 0 0

D18

Low Tariff weekend

The start and stop time of the low electricity tariff period for weekends. Three periods can be selected.

0-23 0-23 0-23

0 0 0

D19

Light Saving Time

Light Saving Time can be deactivated. OFF/ON

ON

D20

PV min Voltage HP

The minimum voltage (V) required to start the HP when the PV function is active.

0-10

0 D21

PV min Voltage EL

The minimum voltage (V) required to start the electric heater when the PV function is active.

0-10

0

D22

PV min time

The minimum time (minutes) at which the input voltage from the PV panel should be above the set point D20/D21 (PV min Voltage HP/EL) in order to start the electric heater or heat pump when the PV function is active D22 also regulates the minimum heat pump operational time when started by the PV function.

1-120

15 D23

Solar Temp max

The maximum allowed temperature (°C) in the solar collector. 55-89

89

D24

Solar DT min

The minimum temperature (°C) difference between solar collector and tank.

1-5 5

D25

Floor Temp start

The temperature (°C) that needs to be in the tank to allow the floor function to be active with hysteresis of 1K.

25-45

35

D26

Extra function

The desired extra function is selected here. The possible functions are Solar, Floor or Cooling. Once the function is activated, move to the function menu and adjust the set point as desired.

OFF/ Solar/ Floor/ Cooling

OFF

Domestic Hot Water Heat Pump Service Manual

57

Code

Set point name

Description

Range

Factory setting

D27

SG Ready

The SG ready function can be activated by the installer here. Three possible modes can be selected. This function allows the start of the heat pump from an external access (See QA1 in Figure 16).

SG ready is not active if there is not external input (SG1 OFF, SG2 OFF).

OFF

The heat pump and electric heater must start, if below the max water temperature allowed in the tank. Both Heat Pump and Electric heater are forced to operate (SG1 ON and SG2 ON).

SG BOOST

The heat pump operates minimizing costs, only the heat pump is activated (SG1 OFF, SG2 ON).

SG ECO

The unit can be stopped even if there is a need for hot water (SG1 ON, SG2 OFF).

SG BLOCK

D28

Cooling 1

The fan and heat pump run until the additional temperature sensor, BT5, placed in the room environment is below a certain level. The water temperature can only reach the maximum temperature allowed in the tank D33 (T HP max). The cooling function activates a three-way damper, which directs the cold exhaust air to a room with cooling requirements. The two functions operate the damper in opposite directions

Cooling1 / Cooling2

Cooling1

Cooling 2

Cooling 1 (2). If BT5 is higher than B10 T Cooling, the extra relay that operates the damper (GP1) switches ON (OFF).

If BT5 is lower than B10 (T Cooling), the extra relay that operate the damper (GP1) switches OFF (ON).

D29

OFF

Normal operation.

OFF/ Hygrostat/ Ventilation Max/ Start-Stop

OFF

Hygrostat

The fan always runs according to the input signal in GC1 (0-10V) from an external hygrostat, CO2 – sensor or similar appliances.

1. If the voltage is between 0-3.0V the fan speed id D5 (Fan min speed)

2. If the voltage is between 3.0-8.0V the fan speed is D4 (Fan medium speed)

3. If the voltage is higher than 8V the fan speed is D3 (Fan max speed)

Ventilation max

If the ventilation function is already selected,

a signal higher of 2V to GC1 leads to maximum air flow.

Start/ Stop

If GC1 receives a signal higher than 2V, the unit operation is stopped. D30

Filter timer

The filter function is activated (ON) or deactivated (OFF). OFF/ON

OFF

D31

Filter timer time

If the filter function is ON then the timer of the filter can be selected. This set point determines the number of months after which the filter alarm is displayed.

0 -12

3 D32

Filter reset

Once the air filter has been replaced, activate this function to reset the filter timer.

OFF/ON

OFF

D33

Temp HP max

The maximum water temperature that can be reached by the heat pump in °C .

50-65

60

Domestic Hot Water Heat Pump Service Manual

58

11.0 Periodic inspection items

Please observe local rules and regulations regarding potential periodical inspections of the domestic hot water heat pump by skilled personnel.

11.1 Environmental requirements When repairing or dismantling the domestic hot water heat pump please follow the environmental regulations and legal requirements in relation to the recycling and disposal of materials.

11.2 Heating system and fan Servicing primarily consists of cleaning the evaporator if no air inlet filter is installed.

 Remove the top plate of the unit.  Relocate cables from the top part of the EPS housing.  Remove the top part of the EPS housing off the unit.  Clean the evaporator and fan with a bottle and brush.

NOTE: Do not use air conditioner cleaning fluids and aerosols, the chemicals contained in these products can damage the EPS parts.

Be careful not to remove balancing weights on the fan wheel during this process, as this will cause an imbalance and lead to a higher noise level as well as wear and tear on the fan.

11.3 Condensation and condensate drain Together with inspecting and cleaning of the fan, the condensate drain shall be cleaned of dirt. Pour some water in the lower half of the EPS part and check if the water flows freely. If not, then the drain must be cleaned.

11.4 Water circulation and water tank

11.4.1 Pressure relief valve

Your installer has installed a pressure relief valve near the cold water connection on the domestic hot water tank to protect the water tank against excessive pressures when the domestic water expands during the heating process.

The back pressure valve (check valve), which is installed in front of the pressure relief valve on the cold water pipe, prevents water from the tank flowing back into the cold water pipe. Therefore, the pressure relief valve opens. The redundant water discharges. If the pressure relief valve did not open, the water tank would burst.

The pressure relief valve must be operated regularly to remove lime deposits and to verify that it is not blocked. It is tested by pressing the lever/turning the handle on the pressure relief valve while checking that water discharges. Damage due to a faulty pressure relief valve are not covered by the warranty

Please note that the water may drip from the discharge pipe of the pressure relief valve due to heating of the water.

Domestic Hot Water Heat Pump Service Manual

59

11.4.2 Anode

In order to prevent corrosion of the enamelled hot water tank, a magnesium anode is installed behind the front panel at the top half of the water tank. The anode has a life expectancy of approximately 2-5 years depending on the water quality. It is recommended to inspect the anode every year.

 Disconnect the electrical power supply or pull out the power plug  Remove the plastic front cover. This allows access to the anode.  Disconnect the wire connection between the anode and the tank (se picture below).  Insert a multimeter (range mA) between the anode and the tank.

 Anode current >0.3mA: Anode is active and ok.  Anode current <0.3mA: Anode should be checked and possibly be replaced.

 Reconnect the wire connection between the anode and the tank. Close the front cover and

switch on the unit.

Figure 21 – Anode control

Please note that the water has to be heated to operational temperatures at least once before the test above can be performed.

In order to replace the anode the following should be done:

 Close the water inlet.  Connect a hose to the drain valve so the water from the water from the tank can run to the

nearest drain.

 Open a hot water tapping point (to avoid vacuum in the water tank).  When the water level in the tank is below the anode, this can be removed for inspection and

replacement

Check and replacement of anode must be performed by skilled personnel.

Domestic Hot Water Heat Pump Service Manual

60

12.0 Part exploded view, parts list

Ref No

Part Number

Description

1

43E41001

Compressor

2

43E6V002 43E6V003

PCB Board standard PCB Board deluxe

3

43E50002

Sensor, thermo

4

43E20001

Fan Kit

5

43E57002

Heating element

6

43E3V001

Anode

7

43E0N001

Adjustable foot

8

43E4J001

Evaporator

9

43E4Q001

Tube kit

10

43E4N013

Solenoid valve, coil

11

43E50003

Safety breakers

12

43E0A005

Front panel white

13

43E08001

Display with frame

14

43E0A006

Top shell white

15

43E0C001

Top cover white

16

43E11004

Evaporator housing

17

43E11005

Insulation panel

Domestic Hot Water Heat Pump Service Manual

61

13.0 Replacement of parts

Warning: Turn off power supply before removing or replacing any parts

13.1 Open & remove the front panel

Tools:

BT20 Torx Screwdriver

1.

Using the BT20 Torx screwdriver remove the screw at the base of the unit.

2.

A lip on the top edge of the front panel stops it from moving. Lift the panel upwards and over the lip to remove.

3.

 Disconnect the

grounding cables from the top shell.

 Disconnect the

ribbon cable connector from the rear of the display.

The front cover is now disconnected and can be removed





Domestic Hot Water Heat Pump Service Manual

62

13.2 Remove the top shell & top cover

Tools:

BT20 Torx Screwdriver

1.

Complete step 13.1

 Using the BT20

Torx screwdriver, remove the screw on the lower left hand side of the cable entry slot.

 Lift latch on clip

lock and un hook from locking slot

2.

 Open the left

hand side of the cabinet slowly and disconnect the earth cable from the top shell

 There are 3 ‘L’

shaped location points around the base of the top shell. Twist the top shell anti-clockwise to release and lift the top shell off the DHW-HP

3.

To remove the top cover, lift it up over the top of the fan guards.

  



Domestic Hot Water Heat Pump Service Manual

63

13.3 Remove the evaporator housing

Tools:

BT20 Torx Screwdriver

1.

Complete steps 13.1 & 13.2

 There are 6

spring clips holding the upper evaporator housing to the lower half of the housing. Remove the clips taking note of the cable positions and routing

 Lift off the cables

located on the top of the evaporator housing, taking note of cable location and routing.

 Remove upper

evaporator housing by lifting upwards

13.4 Replace the heating element

Tools:

BT20 Torx Screwdriver

1.

Complete step 13.1

 Using the BT20

Torx screwdriver loosen the screw holding the electric heater retaining bracket

 Twist the

retaining bracket to the side until the electric heater becomes loose

Remove the power cables, the electric heater can now be removed by sliding it out of the tube

  

    

Domestic Hot Water Heat Pump Service Manual

64

13.5 Replace the safety breakers

Tools:

BT20 Torx Screwdriver , drill, rivet gun

1.

Complete step 13.1

 Remove the

cables to the safety breaker(s).

 Using the drill:

gently drill the rivets to remove the safety breaker.

Note: the new safety breakers must be riveted back on to the DHW-HP.

13.6 Replace the anode

Tools:

BT20 Torx Screwdriver , 14mm socket, 34mm socket

1.

Complete step 13.1 Drain the tank so the

water level is below the level of the anode.

 Remove the foam

insulation covering the anode location

 Using the 14mm

socket, remove nut retaining the grounding cable.

 Using the 34mm

socket remove the anode from the tank.











Domestic Hot Water Heat Pump Service Manual

65

13.7 Replace the solenoid valve, coil

Tools:

BT20 Torx Screwdriver , No.2 Philips screwdriver, terminal screwdriver

1.

Complete steps 13.1 & 13.2

 The solenoid coil

is located at the rear of the unit behind the refrigeration circuit pipe work

 Remove the

insulation panel by sliding the panel out

 The solenoid

valve coil is now easily visible and accessible

 Using the No.2

Philips screwdriver remove the retaining screw and lift the coil to remove

 The cables

connect to the PC board on terminals 12 & 13 (QN1), bottom left corner of the board. This terminal has a push to fit type connector. Using the terminal screwdriver push into the top of the terminal to release and pull the cable downwards



  



Domestic Hot Water Heat Pump Service Manual

66

13.8 Replace the fan kit

Tools:

BT20 Torx Screwdriver

1.

Complete steps

13.1, 13.2 & 13.3

 The fan assembly

is located to the rear right of the DHW-HP

 Disconnect the 2

cables and plugs from the PC Board, GQ2 (X2 & X7), taking note of the routing of the cables

 To remove the

fan carefully lift upwards out of the lower evaporating housing

13.9 Replace the BT1 sensor

Tools:

BT20 Torx Screwdriver , terminal screwdriver

1.

Complete steps

13.1, 13.2 & 13.3

 The BBT1 sensor

is located to the right hand side of the insulation panel. Take note os sensor position

 Remove the

cables from the terminal block at the top of the PC Board, labelled BBT1. The connection block is a push fit type, using the terminal screwdriver in the slot, push up and pull the cable up to remove.











Domestic Hot Water Heat Pump Service Manual

67

13.10 Replace the BT2 sensor

Tools:

BT20 Torx Screwdriver , terminal screwdriver

1.

Complete steps

13.1, 13.2 & 13.3

 The BBT2 sensor

is located into the heat exchanger at the front of the DHW-HP. The sensor is placed into the heat exchanger 11cm from the top,

7.5 cm from the edge and 3cm in.

 Remove the

cables from the terminal block at the top of the PC Board, labelled BBT2. The connection block is a push fit type, using the terminal screwdriver in the slot, push up and pull the cable up to remove.

13.11 Replace the BT3 sensor

Tools:

BT20 Torx Screwdriver , terminal screwdriver

1.

Complete step 13.1 & 13.2

 The BBT3 sensor

is located into the top pocket to the right of the electric heating element. The sensor is inserted all the way in until it stops.

 Remove the

cables from the terminal block at the top of the PC Board, labelled BBT3. The connection block is a push fit type, using the terminal screwdriver in the slot, push up and pull the cable up to remove.









Domestic Hot Water Heat Pump Service Manual

68

13.12 Replace the BT4 sensor

Tools:

BT20 Torx Screwdriver , terminal screwdriver

1.

Complete steps 13.1 & 13.2

 The BBT4 sensor

is located into the lower pocket to the right of the electric heating element. The sensor is inserted all the way in until it stops.

 Remove the

cables from the terminal block at the top of the PC Board, labelled BBT4. The connection block is a push fit type, using the terminal screwdriver in the slot, push up and pull the cable up to remove.





Figure 1 Update to Deluxe PCB

Domestic Hot Water Heat Pump Service Manual

69

13.13 Replace the compressor

Tools:

BT20 Torx Screwdriver , 8mm socket, reclaim equipment, brazing equipment

1.

Complete steps

13.1, 13.2 & 13.3

 The compressor

is located at the rear of the DHW-HP

 The service port

is located to the right of the refrigeration circuit. Remove the cap and connect the reclaim equipment.

 Using the 8mm

socket remove the compressor connection cap.

 Take note of the

compressor connections. Snip the cable ties which hold the lead in place. Disconnect the compressor connections and move the cable and overload protector away from compressor location.

 Remove the

insulation tape to the compressor discharge pipe and peel back away from the compressor

 Using the brazing

equipment, de-braze the suction and discharge pipes from the compressor

 Remove the

compressor retaining clips, 2 at the front and 1 at the rear, and lift the compressor free from the unit.















Domestic Hot Water Heat Pump Service Manual

70

13.14 Replace the tube kit

Tools:

BT20 Torx Screwdriver , 8mm socket, reclaim equipment, brazing equipment

1.

Complete steps

13.1, 13.2 & 13.3

 The tube kit is

located at the rear of the DHW-HP

 The service port

is located to the right of the refrigeration circuit. Remove the cap and connect the reclaim equipment.

 Remove the

insulation tape to the compressor discharge pipe and peel back away from the compressor and remove insulation, jacket and wiring.

 Using the brazing

equipment, de-braze the suction and discharge pipes from the compressor

 De-braze pipes

from the heat exchanger.

 Remove the

insulation tape and move the insulation on the condenser pipe. De-braze pipe at joint just above mechanical fitting.





  



Domestic Hot Water Heat Pump Service Manual

71

13.15 Replace the PCB board, Standard (1.) & Deluxe (2.)

Tools:

BT20 Torx Screwdriver , terminal screwdriver

1.

Complete steps 13.1 & 13.2, Std PCB

 Although all

cables are identified for location, take note of the conductor colour for the terminal block connection

 The PC Board is

held on to the PC board bracket using plastic mounts, pinch to release

 The PC Board

bracket can be removed by use of a BT20 Torx screwdriver

2.

Complete steps 13.1 & 13.2, Deluxe PCB

 Although all

cables are identified for location, take note of the conductor colour for the terminal block connection

 The PC Board is

held on to the PC board bracket using plastic mounts, pinch to release

 The PC Board

bracket can be removed by use of a BT20 Torx screwdriver

13.16 Replace the display & frame

Tools:

BT20 Torx Screwdriver

1.

Complete step 13.1

 Unclip the display

frame from the display by gently pulling the top edge.

 Using the BT20

Torx screwdriver, remove the 4 retaining screws from the panel.







  





Figure 2 Update to Deluxe PCB

TOSHIBA CARRIER EUROPE S.A.S

Route de Thil 01120 Montluel France

1402410401R01