Toshiba HWS-1501CSHM3-E(-UK), HWS-2101CSHM3-E(-UK), HWS-3001CSHM3-E(-UK) SERVICE MANUAL

AIR TO WATER HEAT PUMP

SERVICE MANUAL

Model name:

A09-002

Hydro Unit

HWS-802XWHM3-E
HWS-802XWHT6-E
HWS-1402XWHM3-E
HWS-1402XWHT6-E
HWS-1402XWHT9-E

Hot Water Cylinder

HWS-1501CSHM3-E(-UK)
HWS-2101CSHM3-E(-UK)
HWS-3001CSHM3-E(-UK)

Outdoor Unit

HWS-802H-E
HWS-1102H-E
HWS-1402H-E

Contents

1 SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 NEW REFRIGERANT (R410A). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2-1.Safety During Installation and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2-2.Installing refrigerant pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2-2-1.Steel pipe and joint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2-2-2.Processing of piping materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2-3.Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2-3-1.Necessary tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2-4.Recharging of refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2-5.Brazing of pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2-5-1.Materials of brazing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2-5-2.Flux . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2-5-3.Brazing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4 Outside Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4-1.Hydro unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4-2.Outdoor unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

4-3.Hot water cylinder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5-1.Hydro Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

5-2.Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

5-3.Hot Water Cylinder Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6 Key Electric Component Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6-1.Hydro Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

6-2.Outdoor Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6-3.Hot Water Cylinder Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

6-4.Water Heat Exchange Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

6-5.Outdoor Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

7 Refrigeration Cycle / Water System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7-1.Water System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

7-2.Refrigeration Cycle System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

8 Operational Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

1

9 Method of Defect Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

9-1.Matters to be confirmed first . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

9-1-1.Check the power supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

9-1-2.Check for any miswiring of the connection cables between the hydro unit and the

outdoor unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

9-1-3.About the installation of the temperature sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

9-2.Non-defective operation (program operation) … No fault code display appears.. . . . . . . . . . . . . . 65

9-3.Outline of the determination diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

9-3-1.Procedure of defect diagnosis. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

9-3-2.How to determine from the check code on the remote control . . . . . . . . . . . . . . . . . . . . . 66

9-3-3.How to cancel a check code on the remote controller . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

9-3-4.How to diagnose by error code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

9-4.Diagnosis flow chart for each error code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

9-4-1.Hydro unit failure detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

9-4-2.Outdoor Unit Failure Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

9-4-3.Temperature sensor, temperature-resistance characteristic table . . . . . . . . . . . . . . . . . 101

9-5.Operation check by PC board switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

9-5-1.Operation check mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

9-6.Brief method for checking the key components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

9-6-1.Hydro unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

9-6-2.Outdoor unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

10 Hydro unit and Outdoor Unit Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

11 How to Exchange Main Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

12 Periodic Inspection Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

13 Part Exploded View, Part List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

2

1 SAFETY PRECAUTIONS

The unit and this service guide list very important safety precautions.
Understand the following details (indications and symbols) before reading the body text, and follow the instructions.

[About indication]

Indication Meaning of Indication

DANGER

WARNING

CAUTION

* Property damage indicates extended damage to property, furniture, livestock, or pets.

Indicates that a wrong operation may cause a service engineer and the third persons
around to get fatal or serious injuries.

Indicates that a wrong operation may cause a service engineer and the third persons
around to get fatal or serious injuries, or that unit defective after the operation may cause
a user to have a similar serious accident.

Indicates that a wrong operation may cause a service engineer and the third persons
around to get injuries or may cause property damage*, or that unit defective after the
operation may cause a user to have a similar accident.

[About symbols]

Symbols Meaning of Symbols

Indicates a forbidden action.
Specific forbidden actions are described in text near the symbol.

Indicates a forcible (must do) action.
Specific forcible actions are described in text near the symbol.

Indicates a caution (including danger and warning).
Specific cautions are described in picture or text inside or near the symbol.

DANGER

<Turn off the power breaker>
Turn off the power breaker before removing the front panel and cabinet.

• Failure to do so may cause a high voltage electric shock, leading to death or injury.

• During an operation, the second side circuit of high pressure transmission(*) are applied with a high voltage of 230V
or higher.

• Touching the circuit even with an electrical insulator, let alone a bare hand or body, causes an electric shock.

∗: For details, see the schematic.

<Discharge between terminals>
When the front panel and cabinet are removed, make short-circuit current to discharge between high pressure

capacitor terminals.

• Failure to do so may cause a high voltage electric shock, leading to death or injury.

• After the power is turned off, the high pressure capacitor is still charged with high voltage.

<Forbidden>
Do not turn on the power breaker after removing the front panel cabinet.

• Failure to do so may cause a high voltage electric shock, leading to death or injury.

WARNING

<Check earth ground>
Before starting failure diagnosis or repair, check that the ground wire (∗) is connected to the unit ground terminal.

• An unconnected ground wire could cause an electric shock if electric leakage occurs.

• If the earth ground is not properly connected, ask an electrical worker for rework of the ground connection.

∗: Ground wire of class D grounding

3

WARNING

<No modification>
Do not modify the unit.

• Do not disassemble or modify the parts also.

• A fire, an electric shock, or an injury may occur.

<Use specified parts>
Use the specified parts (∗) when replacing them.

• Using parts other than specified ones may cause a fire or an electric shock.

∗: For details, see the parts price list.

<Keep children away from unit>
Keep any person (including children) other than service engineers away from a failure diagnosis or repairing place.

• A tool or disassembled parts may cause an injury.

• Advise the customer to keep the third persons (including children) away from the unit.

<Insulation treatment>
After connecting a cut lead with a crimp contact, discharge by facing the closed side upward.

• Connect lead wires with crimping terminals and turn the closed end upwards to avoid exposure to water.

<Watch out for fire>
Observe the following instructions when repairing the refrigerant cycle.

(1) Watch out for surrounding fire. Always put out the fire of stove burner or other devices before starting the repair.

Should the fire fail to be put out, the oil mixed with refrigerant gas could catch fire.

(2) Do no use a welder in a closed room.

A room with no ventilation may cause carbon monoxide poisoning.

(3) Keep away flammable materials.

The materials may catch the fire of a welder.

<Use refrigerant carefully>
Check the refrigerant name to use the tools and members appropriate for the refrigerant.

• A product using the refrigerant R410A has the refrigerant name prominently displayed on its outdoor unit. In
addition, the diameter of the service port is changed from that of the conventional R22 to prevent incorrect filling.

Never use refrigerant other than R410A for Air to Water Heat Pump using R410A. Also, never use R410A for Air to
Water Heat Pump using other refrigerant (such as R22).

• A mixture of R410A with different ones excessively raises the pressure in the refrigerant cycle, leading to an injury
due to burst.

Do not make additional charge of the refrigerant.

• An additional charge when refrigerant gas leaks changes the refrigerant composition in the refrigerant cycle,
causing the characteristics change of the Air to Water Heat Pump or excessive high pressure in the refrigerant
cycle with more than the specified amount of refrigerant charged. This may cause burst or an injury. If the
refrigerant gas leaks, perform refrigerant recovery or other operation to make the Air to Water Heat Pump contain
no refrigerant, and then perform vacuuming. After that, refill the unit with the defined amount of liquid refrigerant.
Never charge refrigerant exceeding the amount specified.

When the refrigerant cycle is refilled with refrigerant, do not enter air or refrigerants other than the specified
refrigerant, R410A.

• A mixture of R410A with air or an inappropriate substance causes excessive high pressure inside the refrigerant
cycle, leading to an injury due to burst.

Check that there is no refrigerant gas leak after the installation is completed.

• If it catches fire of a fan heater, a space heater, or a stove, poisonous gases may be produced.

<Be careful with wiring>
After a repair is completed, be sure to reassemble the parts and put the wiring back to its original state. In addition,

be careful with the internal wiring not to be caught in a cabinet or panel.

• A defective assembly or wiring may cause a disaster at a customer site due to electrical leakage or a fire.

<Check for water leak>
After the repair of a water pathway is completed, check that there is no water leak.

• In using the product, water leak may cause a fire at a customer site due to electrical leakage or an electric shock.

4

WARNING

<Check insulation>
After the work is completed, check with an insulating-resistance tester (500V) that the insulation resistance between

the live and dead-metal parts is 2 MΩ or higher.

• A low insulation resistance may cause a disaster at a customer site due to electrical leakage or an electric shock.

<Ventilate>
Ventilate if refrigerant gas leaks during service work.

• Should refrigerant gas catch fire, poisonous gases may be produced. A closed room full of leaking refrigerant
results in the absence of oxygen; it is dangerous. Make sure to ventilate.

<Caution: electric shock>
When checking a circuit while energized if necessary, use rubber gloves not to contact the live part.

• Contact with the live part may cause an electric shock.

• The unit contains high-voltage circuits. Contact with a part in the control board with your bare hand may cause an
electric shock. Take enough care to check circuits.

<Turn off the power breaker>
Because the electrical components are energized with high voltage, always turn off the power breaker before

starting to work.

• Failure to do so may cause an electric shock.

<Always do>
Should refrigerant gas leak, find where the gas leaks and properly repair it.

• To stop the repair work because the leakage location cannot be identified, perform refrigerant recovery and close
the service valve. Failure to do so may cause the refrigerant gas to leak in a room. Although refrigerant gas alone
is harmless, if it catches fire of a fan heater, a space heater, or a stove, poisonous gases may be produced.

When installing the unit or re-installing it after relocation, follow the installation guide for proper operation.

• A defective installation may cause a refrigerant cycle defective, a water leak, an electric shock, or a fire.

<Check after repair>
After a repair is completed, check for any abnormality.

• Failure to do so may cause a fire, an electric shock, or an injury.

• Turn off the power breaker to perform check.

After a repair is completed (and the front panel and cabinet are placed), make a test run to check for any abnormality
such as smoke or abnormal sound.

• Failure to do so may cause a fire or an electric shock. Place the front panel and cabinet before making a test run.

<Check after re-installation>
Check that the following are properly performed after re-installation.

(1) The ground wire is properly connected.
(2) The installation is stable without any tilt or wobbles.

Failure to check them may cause a fire, an electric shock, or an injury.

CAUTION

<Wear gloves>
Wear gloves (∗) when performing repair.

• Failure to do so may cause an injury when accidentally contacting the parts.

∗: Thick gloves such as cotton work gloves

<Cooling check>
Perform service work when the unit becomes cool enough after the operation.

• High temperature of compressor piping or other equipment after a cooling or heating operation may cause burn.

<Tighten with torque wrench>
Tighten a flare nut with a torque wrench in the specified method.

• A flare nut tightened too much might crack after a long period, causing refrigerant leak.

5

2 NEW REFRIGERANT (R410A)

This Air to Water Heat Pump adopts a new refrigerant HFC (R410A) to prevent destruction of the ozone layer.
The working pressure of R410A refrigerant is 1.6 times higher than that of the conventional refrigerant R22.The

refrigerant oil is also changed for the new refrigeration. Therefore, during installation or service work, be sure that
water, dust, former refrigerant, or refrigeration machine oil does not enter the refrigerant cycle of the new type
refrigerant Air to Water Heat Pump. A wrong installation or service operation may cause a serious accident.
Read carefully the following instructions to use the tools or members for R410A for safety work.

2-1. Safety During Installation and Service

• Use only the refrigerant R410A for Air to Water Heat Pump using R410A.
A mixture of R410A with different ones excessively raises the pressure in a refrigerant cycle, leading to an injury
due to burst.

• Check the refrigerant name to use the tools and members appropriate for the refrigerant.
A product using the refrigerant R410A has the refrigerant name prominently displayed on its outdoor unit. In
addition, the diameter of the service port is changed from that of the conventional R22 to prevent incorrect filling.

• Ventilate if refrigerant gas leaks during service work.
Should refrigerant gas catch fire, poisonous gases may be produced. A closed room full of leaking refrigerant
results in the absence of oxygen; it is dangerous. Make sure to ventilate.

• When the refrigerant cycle is refilled with refrigerant, do not mix air or refrigerants other than the specified
refrigerant, R410A.
A mixture of R410A with air or an inappropriate substance causes excessive high pressure inside the refrigerant
cycle, leading to an injury due to burst.

• Check that no refrigerant gas leaks after the installation is completed.
Should a refrigerant gas leak in a room and catch fire, poisonous gases may be produced.

• When installing the unit that contains large amount of refrigerant such as Air to Water Heat Pump, take measures
to prevent the refrigerant from exceeding the threshold concentration in case it leaks.
Should leaking refrigerant exceed the threshold concentration could cause an accident due to oxygen deficient.

• When installing the unit or re-installing it after relocation, follow the installation guide for proper operation.
A defective installation may cause a refrigerant cycle defective, a water leak, an electric shock, or a fire.

• Do not modify the product. Do not disassemble or modify the parts also.
A fire, an electric shock, or an injury may occur.

6

2-2. Installing refrigerant pipe

2-2-1. Steel pipe and joint

For refrigerant piping, steel pipe and joints are mainly used. Select those comply with JIS (Japanese Industrial
Standards) for a service work. Also, use such clean piping materials that less impurities attach to the inside of pipe
and joints.

Copper pipe

Use copper pipe of the “copper and copper alloy seamless pipe” type with attach oil quantity of 40 mg / 10 m or less.
Do not use pipe that is cracked, distorted, or discolored (especially inside).The expansion valve or capillary may
get clogged with impurities.
Considering that Air to Water Heat Pump using R410A is higher in pressure than those using the conventional R22,
be sure to select the material that comply with the standard.
Table 2-1 shows the thickness of copper pipe used for R410A.
Never use commercially available thin-walled copper pipe of 0.8 mm thick or less.

Table 2-1 Wall thickness of copper pipe

Wall thickness (mm)

Nominal diameter Outer diameter R410A

3/8 9.52 0.80

5/8 15.88 1.00

Joints

For the joint of copper pipe, flared joint and socket joint are used. Remove impurities from a joint before using it.

• Flared joint
A flared joint cannot be used for the copper pipe whose outer diameter is 20 mm or larger. A socket joint can be
used instead in that case.
Table 2-2-3 and 2-2-4 show the dimensions of flare pipe, the end of flared joint, and flare nuts.

• Socket joint
A socket joint is used to connect the thick-walled pipe of mainly 20 mm or larger in diameter.
Table 2-2 shows the wall thickness of socket joints.

Table 2-2 The minimum wall thickness of socket joints

Nominal diameter

3/8 9.52 0.80

5/8 15.9 1.00

Reference of outer diameter of

copper pipe connected (mm)

Minimum joint wall thickness

(mm)

7

2-2-2. Processing of piping materials

When installing refrigerant pipe, prevent water or dust from entering the pipe, and do not use oil other than lubricant
used for Air to Water Heat Pump. Make sure that no refrigerant leak occurs.

If piping needs lubrication, use lubricating oil whose water content is removed.
After the oil is put in, be sure to seal the container with airproof cover or other covers.

Flare and precautions

1) Cut a pipe.

Cut slowly with a pipe cutter so that the pipe is not distorted.

2) Remove burr and flaw.

A burr or flaw in a flare part may cause refrigerant leak. Remove carefully all the burrs, and clean up the
cut ends before installation.

3) Insert a flare nut.

4) Flare

Check that the clasps and copper pipe are clean. Flare
correctly using the clasp. Use a flare tool for R410A or the
conventional one. Flare processing dimension varies
depending on the flare tool type. When using the
conventional flare tool, use a gauge for size adjustment
to secure the A dimension.

Figure 2-2-1
Flare dimension

D

A

Table 2-2-3 Flare processing related dimension for R410A

Nominal

diameter

3/8 9.52 0.8 0 to 0.5 1.0 to 1.5 2.0 to 2.5

5/8 15.9 1.0 0 to 0.5 1.0 to 1.5 2.0 to 2.5

Outer diameter

(mm)

Wall thickness

(mm)

Flare tool for R410A

clutch type

Table 2-2-4 Dimension of flare for R410A and flare nut

Nominal

diameter

3/8 9.52 0.8 13.0 13.2 9.7 20 18

5/8 15.9 1.0 19.1 19.7 15.9 24.5 26

Outer diameter

(mm)

Wall thickness

(mm)

ABCD

Dimension (mm)

Figure 2-2-2 Relationship between flare nut and flare surface

45° - 46°

A (mm)

Conventional flare tool

Clutch type Butterfly-nut type

Flare nut width

(mm)

DCB A

43° - 45°

8

Flare connecting procedure and precautions

1) Make sure that the flare and connecting portions do not have any flaw and dust.

2) Correctly align the flared surface and the connecting axis.

3) Tighten the flare with designated torque by means of a torque wrench. The tightening torque for R410A is
the same as that for the conventional R22. If the torque is weak, gas leakage may occur. If it is too strong,
the flare nut may crack and may be made non-removable. When choosing the tightening toque, comply
with values designated by products. Table 2-2-5 shows reference values.

NOTE

When applying oil to the flare surface, be sure to use oil designated by the product. Using any other oil deteriorates
the lubricating oil, possibly causing the compressor to burn out.

Table 2-2-5 Tightening torque of flare for R410A (Reference values)

Nominal diameter Outer diameter (mm) Tightening torque N•m (kgf•m)

3/8 9.52 33 to 42 (3.3 to 14.2)

5/8 15.9 66 to 82 (6.8 to 8.2)

9

2-3. Tools

2-3-1. Necessary tools

In Air to Water Heat Pump using R410A, the service port diameter of packed valve of the outdoor unit is changed
to prevent mixing of other refrigerant. To reinforce the pressure resistance, flare dimensions and opposite side
dimensions of flare nut (For Ø 12.7 copper pipe) of the refrigerant piping are lengthened.

Because the refrigerating machine oil is changed, mixing of oil may generate sludge, clog capillary, or cause other
problems. Accordingly, the tools to be used include:

• tools dedicated for R410A (Those that cannot be used for the conventional refrigerant, R22)

• tools dedicated for R410A, but can be also used for the conventional refrigerant, R22

• tools that can be used for the conventional refrigerant, R22.
The following table shows the tools dedicated for R410A and their interchangeability.

Tools dedicated for R410A (The following tools must be for R410A)

Tools whose specifications are changed for R410A and their interchangeability

R410A Air to Water Hear Pump

No. Tool to be used Usage

1 Flare tool Pipe flaring Yes *(Note 1) Yes

2

3 Torque wrench (For Ø15.9) Connection of flare nut Yes No No

4 Gauge manifold

5 Charge hose

6 Vacuum pump adapter Vacuum evacuating Yes No Yes

7

8 Refrigerant cylinder Refrigerant charge Yes No No

9 Leakage detector Gas leakage check Yes No Yes

10 Charging cylinder Refrigerant charge *(Note 2) No No

Copper pipe gauge for

adjusting projection margin

Electrical balance for

refrigerant charging

Flaring by conventional

flare tool

Evacuating, refrigerant
charge, run check, etc.

Refrigerant charge Yes No Yes

For R410A

Existence of new

equipment

installation

Conventional

equipment can be

used

Yes *(Note 1) *(Note 1)

Yes No No

Conventional refrigerant

Air to Water Heat Pump

installation

New equipment can be

used with conventional

refrigerant

* (Note 1) Flaring for R410A by using the conventional flare tool requires projection margin adjustment. This

adjustment requires copper pipe gauge or other instrument.

* (Note 2) A charging cylinder for R410A is currently under development.

General tools (Conventional tools are available)

In addition to the above dedicated tools, the following equipment also available for R22 is necessary as the general
tools.

1. Vacuum pump
Use this by attaching vacuum pump

adapter.

4. Reamer 9. Hole core drill (Ø65)

5. Pipe bender 10. Hexagon wrench
(Opposite side 4mm)6. Level vial

2. Torque wrench (For Ø6.35) 7. Screwdriver (+, –) 11. Tape measure

3. Pipe cutter 8. Spanner or Monkey wrench 12. Metal saw

Also prepare the following equipment for other work methods or run check.

1. Clamp meter 3. Insulation resistance meter

2. Thermometer 4. Electroscope

10

2-4. Recharging of refrigerant

Recharge, if necessary, the specified amount of new refrigerant according to the following procedure.

Recover the refrigerant, and check that no
refrigerant remains in the refrigerant cycle.

Connect the charge hose to packed valve service
port on the outdoor unit's gas side.

Connect the charge hose to the vacuum pump
adapter.

Open fully both packed valves on the liquid and
gas sides.

Open fully the handle of gauge manifold Lo, turn on the
vacuum pump, and then perform vacuum evacuating.

When the compound gauge's pointer indicates

-0.1 MPa (-76cmHg), close fully the handle Lo and turn
off the vacuum pump.

Let the equipment stay as it is for one to two minutes
and check that the compound gauge pointer does not
return.

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

(For refrigerant charging, see the figure below)

NOTE

• Never charge refrigerant exceeding the specified amount.

• If the specified amount of refrigerant cannot be charged, charge it a little at a time while running refrigerant
recovery (pump down).

• Do not make additional charging.
An additional charge when refrigerant leaks changes the refrigerant composition in the refrigerant cycle,
causing the characteristics change of the Air to Water Heat Pump or excessive high pressure in the refrigerant
cycle with more than the specified amount of refrigerant charged. This may cause burst or an injury.

Fig. 2-4-1 Configuration of refrigerant charging

(Hydro unit)

Refrigerant cylinder (with siphon)

Check valve

CloseOpen

Open/close valve
for charging

Electronic balance for refrigerant charging

11

(Outdoor unit)

Open

Open

Service port

NOTE

• Make sure that the setting is appropriate so that liquid can be charged.

• A cylinder with siphon enables liquid to be charged without the cylinder turned upside down.

[Cylinder without siphon]

Gauge manifold

Outdoor unit

Siphon pipe

Gauge manifold

Refrigerant
cylinder

Electronic balance

[Cylinder with siphon]

Outdoor unit

Refrigerant
cylinder

Electronic balance

NOTE

• Because R410A is HFC mixed refrigerant, charging with gas changes the charged refrigerant composition,
causing the equipment characteristics to change.

12

2-5. Brazing of pipes

2-5-1. Materials of brazing

Silver brazing metal

Silver brazing metal is an alloy mainly composed of
silver and copper.

It uses iron, copper, or copper alloy, and is relatively
expensive though it excels in soldering.

Phosphor bronze brazing metal

Phosphor bronze brazing metal is generally used to
join copper or copper alloy.

Low temperature brazing metal

Low temperature brazing metal is generally called
solder, and is an alloy of tin and lead. Do not use it for
refrigerant piping because its adhesive capacity is low.

NOTE

• Phosphor bronze brazing metal tends to react with
sulfur, producing a fragile compound water solution.
This may cause gas leakage. Therefore, use other
type of brazing metal at a hot spring resort or similar
place, and coat the surface with coatings.

• To braze the pipe again while performing service
work, use the same type of brazing metal.

2-5-2. Flux

Type of flux

• Non-corrosive flux
It is generally a compound of borax and boric acid.
It is effective when brazing temperature is higher
than 800 °C.

• Active solvent
Most of this type of flux is generally used for silver
brazing.
It features the increase of oxide film while moving the
capability to the borax-boric acid compound to add
compounds such as potassium fluoride, potassium
chloride, or sodium fluoride.

Piping materials for brazing and brazing
metal / flux

Piping material

Copper - Copper Phosphor copper Do not use

Copper - Iron Silver Paste flux

Iron - Iron Silver Vapour flux

NOTE

• Do not enter flux into the refrigerant cycle.

• If chlorine contained in the flux remains within the
pipe, the lubricating oil deteriorates. Because of
this, use a flux that does not contain chlorine.

• When adding water to the flux, use water that does
not contains chlorine. (e.g. distilled water or ion­exchange water)

• Remove the flux after brazing.

Brazing metal to be

used

Flux to be used

Why flux is necessary

• Removing all the oxide film and any foreign matter
on the metal surface assists the flow of brazing
metal.

• Flux prevents the metal surface from being oxidized
in the course of brazing.

• Reducing the brazing metal's surface tension
enables the brazing metal to adhere for better metal
processing.

Characteristics of flux

• The activation temperature of flux matches the
brazing temperature.

• A wide effective temperature range makes flux hard
to carbonize.

• It is easy to remove slag after brazing.

• The corrosive action to the treated metal and brazing
metal is minimum.

• The good performance of flux gives no harm to a
human body.
Since flux works in a complicated manner as
described above, select an appropriate type of flux
according to metal treatment type, brazing metal and
brazing method, or other conditions.

2-5-3. Brazing

Brazing must be performed by a person qualified and
experienced with theoretical knowledge since the
operation requires sophisticated techniques.
Perform brazing while flowing dry nitrogen gas (N2) to
prevent oxide film from forming during brazing
application to the inside of the pipe.

NOTE

• Never use gas other than nitrogen gas.

Brazing method to prevent oxidation

1) Attach a reducing valve and a flow meter to the
nitrogen cylinder.

2) Use a copper pipe to direct the piping material,
and attach the flow meter to the balance.

3) Apply a mark to the clearance between the
piping material and the copper pipe filled with
nitrogen to prevent the back flow of the
nitrogen gas.

4) If the nitrogen gas flows out, be sure to keep
open the piping end.

13

5) Use the reducing valve to adjust the nitrogen
gas flow speed to 0.05 m
(0.2 kgf/cm

2

).

3

/hour or 0.02 MPa

6) After the steps above, keep the nitrogen gas
flowing until the pipe cools down to a certain
extent. (Temperature where the pipe is cool
enough to be touched by hands)

7) Remove the flux completely after brazing.

Fig 2-5-1
Prevention of oxidation during brazing

Flow meter

M

Stop valve

Nitrogen gas cylinder

From nitrogen cylinder

Pipe

Nitrogen gas

Robber plug

14

3 Specifications

Unit name Hydro unit HWS-802XWHM3-E, 802XWHT6-E

Heating capacity *1 (kW) 8.0

Cooling capacity *2 (kW) 6.0

Variable range of compressor frequency 10 - 70 Hz

Power source Single phase 50Hz 230V

Operation mode Heating Cooling

Electric characteristic *1 *2 Hydro unit Current (A) 0.98 0.46

Operating noise *1 *2 *4 Hydro unit (dB(A)) 29 29

Coefficient of performance *1 *2 4.08 2.82

Hydro unit Outer dimension Height (mm) 925

Outdoor unit Outer dimension Height (mm) 890

Refrigerant piping Connection method Flare connection

Refrigerant Refrigerant name R410A

Water piping Pipe diameter R1 1/4

Operating temperature range Hydro unit (°C) 5-32

Operating humidity range Hydro unit (%) 15-85

Wiring connection Power w iring 3 wires: including ground line (Outdoor unit)

*1 Heating performance measurement conditions: outside air temperature 7 or 6 °C, water supply temperature 30 °C, outlet temperature 35 °C, refrigerant piping length 7.5 m (no height

difference), capacity 97%, COP 95%, operating noise +3 dB

*2 Cooling performance measurement conditions: outside air temperature 35 °C, water supply temperature 12 °C, outlet temperature 7 °C, refrigerant piping length 7.5 m (no height

difference), capacity 97%, COP 95%, operating noise +3 dB

*3 • The remote controller should be shipped with the hydro unit.

• Use two 1.5-meter wires to connect the hydro unit with the remote controller.

*4 The outdoor unit operating noise is measured at the point of 1m away from the unit back surface center and 1m high from the ground. The hydro unit operating noise is measured at the

point of 1m away from the unit front surface center.

The value of the operating noise varies depending on room structure where the unit is installed.
*5 Do not leave the hydro unit at 5 °C or below.
*6 Check the water piping for leakage under the maximum operating pressure.

Outdoor unit HWS-802H-E

Power (kW) 0.101 0.097

Outdoor unit Current (A) 8.26 8.90

Total Starting current (A) 9.24 9.36

Outdoor unit (dB(A)) 49 49

Net weight (kg) 50

Color Silky shade (M unsell 1Y8.5/0.5)

Remote controller
Outer dimension *3

Circulating pump Motor output (W) 125 (MAX)

Heat exchanger Plate-type heat exchange

Net weight (kg) 63

Color Silky shade (M unsell 1Y8.5/0.5)

Compressor Motor output (W) 1400

Fan motor Sta ndard air capacity (m3/min) 50.0

Hydro unit Liquid Ø9.52

Outdoor unit Liquid Ø9.52

Maximum length (m) 30

Maximum chargeless length (m) 30

Maximum height difference (m) ±30

Minimum length (m) 5

Charge amount (kg) 1.8

Maximum length (m) None (Need the flow rate 17.5 /min or more)

Maximum height difference (m) ±7

Maximum working water pressure (kPa) 300

Outdoor unit (°C) -20-43

Outdoor unit (%) 15-100

Connecting line 4 wires: includ ing ground line

Power factor (%) 9 1.5 91.7

Power (kW) 1.859 2.033

Power factor (%) 9 7.8 99.3

Width (mm) 525

Depth (mm) 355

Height (mm) 120

Width (mm) 120

Depth (mm) 20

Flow rate (L/min) 22.9 17.2

Type Non-self-suction centrifugal pump

Width (mm) 900

Depth (mm) 320

Type Twin rotary type with DC-inverter variable speed control

Model DA220A2F-22L

Motor output (W) 60

Gas Ø15.9

Gas Ø15.9

15

Unit name Hydro unit HWS-1402XWHM3-E, 1402XWHT6-E, 1402XWHT9-E

Heating capacity *1 (kW) 11.2 14.0

Cooling capacity *2 (kW) 10.0 11.0

Variable range of compressor frequency 10 - 60Hz 10 - 70 Hz

Power source Single phase 50Hz 230V

Operation mode Heating Cooling Heating Cooling

Electric characteristic *1 *2 Hydro unit Current (A) 0.63 0.61 0.67 0.63

Operating noise *1 *2 *4 Hydro unit (dB(A)) 29 29 29 29

Coefficient of performance *1 *2 4.66 2.84 4.45 2.69

Hydro unit Outer dimension Height (mm) 925

Outdoor unit Outer dimension Height (mm) 1340

Refrigerant pi ping Connection met hod Flare connection

Refrigerant Refrigerant name R410A

Water piping Pipe diameter R1 1/4

Operating temperature range Hydro unit (°C) 5-32

Operating humidity range Hydro unit (%) 15-85

Wiring connection Power w iring 3 wires: including ground line (Outdoor unit)

*1 Heating performance measurement conditions: outside air temperature 7 or 6 °C, water supply temperature 30 °C, outlet temperature 35 °C, refrigerant piping length 7.5 m (no height

difference), capacity 97%, COP 95%, operating noise +3 dB
*2 Cooling performance measurement conditions: outside air temperature 35 °C, water supply temperature 12 °C, outlet temperature 7 °C, refrigerant piping length 7.5 m (no height

difference), capacity 97%, COP 95%, operating noise +3 dB
*3 • The remote controller should be shipped with the hydro unit.

• Use two 1.5-meter wires to connect the hydro unit with the remote controller.

*4 The outdoor unit operating noise is measured at the point of 1m away from the unit back surface center and 1m high from the ground. The hydro unit operating noise is measured at the

point of 1m away from the unit front surface center.

The value of the operating noise varies depending on room structure where the unit is installed.
*5 Do not leave the hydro unit at 5 °C or below.
*6 Check the water piping for leakage under the maximum operating pressure.

Outdoor unit HWS-1102H-E HWS-1402H-E

Power (kW) 0.135 0.130 0.145 0.135

Outdoor unit Current (A) 10.14 14.88 13.57 17.47

Total Starting current (A) 10.77 15.49 14.24 18.10

Outdoor unit (dB(A)) 49 49 51 51

Net weight (kg) 54

Color Silky shade (M unsell 1Y8.5/0.5)

Remote controller
Outer dimension *3

Circulating pump Motor output (W) 190 (MAX)

Heat exchanger Plate-type heat exchange

Net weight (kg) 90

Color Silky shade (M unsell 1Y8.5/0.5)

Compressor Motor output (W) 2500

Fan motor Sta ndard air capacity (m3/min) 103.0

Hydro unit Liquid Ø9.52

Outdoor unit Liquid Ø9.52

Maximum length (m) 30

Maximum chargeless length (m) 30

Maximum height difference (m) ±30

Minimum length (m) 3

Charge amount (kg) 2.7

Maximum length (m) None (Need the flow rate 13 /min or more)

Maximum height difference (m) ±7

Maximum working water pressure (kPa) 300

Outdoor unit (°C) -20-43

Outdoor unit (%) 15-100

Connecting line 4 wires: including ground line

Power factor (%) 93.2 92.7 94.0 93.2

Power (kW) 2.265 3.39 3.005 3.945

Power factor (%) 96. 9 99.1 96.4 98.1

Width (mm) 525

Depth (mm) 355

Height (mm) 120

Width (mm) 120

Depth (mm) 20

Flow rate (L/ min) 32.1 28.9 40.1 31.5

Type Non-self-suction centrifugal pump

Width (mm) 900

Depth (mm) 320

Type Twin rotary type with DC-inverter variable speed control

Model DA422A3F-25M

Motor output (W) 100 × 2

Gas Ø15.9

Gas Ø15.9

16

4 Outside Drawing

4-1. Hydro unit

HWS-802XWHM3-E, 802XWHT6-E

HWS-1402XWHM3-E, 1402XWHT6-E, 1402XWHT9-E

40.540.5

371.5
355

2-dia.12x17 long hole
(for dia.8-10 anchor bolt)

B leg part

92554

72.5 72.5
Anchor bolt

40

2020

960

Anchor bolt long hole pitch

525

380

long hole pitch

19.5

352

9

Manometer
Remote controler

A leg part

Drain nipple
Water inlet

connecting pipe 1 1/4"

40

259

2-dia.12x17 U-shape hole
(for dia.8-10 anchor bolt)

309.5

17

11619.5

Hot water outlet
connecting pipe 1 1/4"

135.5

186.5

158

37.5

Gas line dia.15.88
Liquid line dia.9.52

59.5144.5

4-2. Outdoor unit

HWS-802H-E

Name Description

Refrigerant piping outlet

Indoor and outdoor

connecting line outlet

Power source intake hole 38 knockout hole

Mounting bolt hole

( 12 17 U-shape hole)

64

55

95

12

12

Mounting bolt hole

( 12 17 long hole)

54
48

Portion B

Drain hole ( 25 burring hole)

60

200

Air inlet

380

170

34

46

75

40

40

Air outlet

Details of portion B

Details of portion A

39

Portion A

383

96

600

150

320

900

550

52

30

Refrigerant gas

Refrigerant liquid

connection

connection

( 9.5 flare)

890

( 15.9 flare)

255
247

24

400

151

80

18

94

95

55

155

55

95

18

80

135

178

178

518

327

178

60

68

17.5

Air inlet

128

365

118

534

74

17.5

5-Drain hole ( 20 88 burring hole)

581

165
148

(12- 3 embossed)

Optional mounting hole

7

7

83

Knockout for lower part of piping

65

Z arrow view

18

HWS-1102H-E, 1402H-E

Description

38 knockout hole

Name

Refrigerant piping outlet

Indoor and outdoor

connecting line outlet

Power source intake hole
2

1

12

40

Mounting bolt hole

( 12 17 long hole)

40

Portion B

Mounting bolt hole

( 12 17 U-shape hole)

Details of portion B

Details of portion A

54
48

39

64

9555

1

1340

320

30

( 15.9 flare)

Refrigerant gas connection

( 9.5 flare)

96

Refrigerant liquid connection

1

2

613
605

1

2

12

24

400

151

80

18

94

55

95

155

55

95

1880

Z

135

Drain hole ( 25 burring hole)

60

200

Air inlet

380

17.5

170

34

46

Air inlet

128

75

118
74

Portion A

70

600

900

Air outlet

383

150

52 550

17.5 365

5-Drain hole ( 20 88 burring hole)

53412153485

360 655

518

327

178 178 178

60

68

70 581 74 581

(24- 3 embossed)

Optional mounting hole

7

83

Knockout for lower part of piping

65

7

Z arrow view

19

4-3. Hot water cylinder

HWS-3001CSHM3-E(-UK)

550

5952066.6

Specification

for UK only

2040

HWS-2101CSHM3-E(-UK)

550

5951497.6

Specification

for UK only

1474

HWS-1501CSHM3-E(-UK)

550

5951114

Specification

for UK only

1090

20

5 Wiring Diagram

SI SW14 est sur OFF la
télécommande reste bloquée

5-1. Hydro Unit

WARNING

!

Perform the grounding from the
earth terminal in the terminal
block of the outdoor unit.

CAUTION

!

Electric shock may happen.
Don't touch the electric parts.

YEL
BLU

BRW

WHI

WHI
RED

WHI

WHI

WHI

YEL

5251

WPM

RED

1211

132
1

2

Power supply
230V

BLU

53

2WV

WHI

13

3

50Hz

BRW

55

565758

54

BH

(2-wire spring return)

(3-wire SPST type)

(3-wire SPDT type)

GRY
TB 01

Outdoor
unit

YEL

WHI

RED

TB 05 TB 04

59

3WV

Type 1

YEL

WHI

RED

TB 05

58

59

57

3WV

Type 2

Type 3

TB 03

Hot water cylinder

BRW

31 32

9

9

787
6
55
4
3
2

1 1

3

3
2

1 1

F1 F2

BLU

21

CN10
(WHI)

CR10
CR11
CR12
CR13

CN01
(WHI)

F01 (5A)

PNK

RED

43

4241

MIXV

(3-wire SPST type)

PNK

RED

43

4241

MIXV

(3-wire SPDT type)

3L2

1L1

RY05

2T1

4T2

BLU

F1, F2

BRW

Fuse
AC250V
T30A

BRW

BLU

NL

Power supply
230V

50Hz

RY
10

RY

11

WHI

ORN

44

Type 1

WHI

ORN

44

Type 2

YEL/GRN

*Option

RY
12

RY

13

p.c.board

(MCC-1431)

TB 04

Relay

CN02
(WHI)

N

WPM

L

RY

A2

Remote

controller

(HWS-AMS11E)

A

GRY

55
4

4

3

3

2

2

11

N
L

A1

05

1L1

RY02

2T1

BRW

F3

F4

BRW

B

WHI

RED
BLU
ORN
GRN

BRW

BLK

BLU

BRW

RED

WHI

YEL
WHI

RED

3L2

4T2

BLU

BLU

Power supply

400V 3N

5
4
3
2
1

11

5 5

1

5L3

6T3

BLK

L1

GRY

F6F5F8

L2

*Option

Remote

controller

(HWS-AMS11E)

TB 07

6
5

CN501

4

(YEL)

3
2
1

33

CN603
(YEL)

33

CN601
(RED)

11

77

3
1

CN602
(WHI)

1L1

F7

BLU

GRY

L3

N

50Hz

B

A

7B7A

WHI

GRY

3

1

2

3

1
CN41

(BLU)

CN604
(BLU)

2

PNK

ORN

Thermal protector
(single operation)

Thermal protector
(single operation)

3L2

4T22T1

BLK

BLU

F3
Fuse
AC250V
T30A

BLU

TB 02

95 5

95

(single operation) 95 5

5L3

6T3

8

TWI

THO

TWO

TC

BLK

BLK

BLK

BLK

BLK

BLK

BLK

2

2

3

1

1

1

1
1

CN203

(YEL)

5

7

5

7

WHI

RED

5

6

4

RED

5

Thermal protector

RY04 RY04

BLU

2

RY601

RY600

RY602

RY603

RY605RY604

3
3

YEL

7

RY
06

8

2

3

1
CN204

(BRW)

1

SW01

SW02

ON

3

12

CN605
(YEL)

1
1

BLK

RY01

Backup heater 1

Backup heater 2

Backup heater 3

2

2

1

1

CN206

CN205

(WHI)

(RED)

P.C.board

(MCC-1511)

4

CN606

3

1

3

1
WHI

ORN

A2

6

RY
02

A1

4

WHI WHI

SW10

ON

(BLU)

HWS-1402XWHT9-E

BLK
3
3

21

RY
03

7

RY02

BLK

WHI

21
21

CN207

(BLU)

3

4

SW06

RY607RY606

1
1

WHI

648

1

*

1L1

F3 F6

SW11

ON

12

ON

BRW

BRW

21

RY

LPS

04

A2

F4

21
2

2
2

3

3
3

PNK

A1

3L2 5L3

4T22T1

3

4

3

4

3

4

3

4

RED
2

3

21

CN212

(WHI)

SW12

ON

4

SW07

6T3

BLU

F5

BLK

BLU

Power supply

400V 3N

*Option

21

BLK

L2L1

TTW

4

3

BLU

BRW
1
1

CN214

(WHI)

SW14

OFF ON

SW13

ON

4

12

CN305
(GRN)

3

1

3

GRY

Thermal protector
(single operation)

Thermal protector
(single operation)

3L2 5L3

1L1

4T22T1

F3 6
Fuse
AC250V
T30A

L3

N

50Hz

BA

6B6A6C6D

BRW
2
2

3

4

CN100

(WHI)

5

95 5

95 5

6T3

BLU

TB 02

TFI

TB 06

RED

RED

3

1

2

3

1
CN213

(WHI)

3

1

3

1

WHI

RED

HWS-802XWHT6-E HWS-802XWHM3-E
HWS-1402XWHT6-E

CN208
(BLU)

CN209
(GRN)

CN210
(RED)

CN211
(BLK)

CN200
(RED)

CN201
(WHI)

CN202

(YEL)

CN102
(WHI)

CN101
(WHI)

F100
Fuse
T5A
250V

WPM
3WV
2WV
MIXV
BH
RY01 RY06
LPS
Backup heater1,2,3

Backup heater 1

Backup heater 2

BLK : BLACK
BRW : BROWN
GRY : GRAY
PNK : PINK
WHI : WHITE

GRN

1

1

GRN

2

2

GRN

3

3

GRN

4

4

GRN

1

1

GRN

2

2

GRN

3

3

GRN

4

4

YEL

1

1

YEL

2

2

YEL

3

3

YEL

4

4

YEL

1

1

YEL

2

2

YEL

3

3

YEL

4

4

YEL

1

1

GRN

2

2

RED

33

BLK

11

BLK

22

BLK

11

BLK

323

BRW

1

1

BRW

2

2

RED

3

3

RED

4

4

ORN

5

5

ORN

6

6

WHI

11

WHI

33

BLK

Symbol

Color indentification

BLU : BLUE
GRN : GREEN
ORN : ORANGE
RED : RED
YEL : YELLOW

1

1

Relay

2

2

p.c.board

3

3

(MCC-1217)

4

4

PJ20

Relay

2112

p.c.board

33

(MCC-1217)

44

PJ20

11

Photocoupler input

22

p.c.board

33

(MCC-1214)

44

PJ17

11

Photocoupler input

22

p.c.board

33

(MCC-1214)

44

PJ17

RY

8

7

01

11
33

HWS-802XWHT6-E : Installed

1

*

HWS-1402XWHT6-E : Installed
HWS-1402XWHT9-E : Installed
HWS-802XWHM3-E : Not installed
HWS-1402XWHM3-E : Not installed

Parts name

Water pump motor
3-way valve (local)
2-way valve (local)
Mixing valve (local)
Booster heater
Relay01 Relay06
Low pressure sensor
Heater AC230V, 3kW

3L2 5L3

1L1

RY02

4T22T1

BLU

BRW

F3

F4

BLU

BRW

L

Power supply

230V

K1
K2

TB1

K1
K2

TB1

TB1

TB1

22

11

High pressure switch

4.15MPa

Thermal protector (auto)
75

± 3

Transformer

Symbol

TC
TWI
TWO
THO
TTW
TFI
TB

Thermal protector
(single operation)

95

±

5

6T3

F3, F4
Fuse
AC250V
T30A

TB 02

N

50Hz

HWS-1402XWHM3-E

4
3
2
1

4
3
2
1

3
2
1

3
2
1

Flow switch

Parts name

Water heat exchanger temperature sensor
Water heat exchanger inlet temperature sensor
Water heat exchanger outlet temperature sensor
Backup heater outlet temperature sensor
Hot water cylinder temperature sensor
Floor heating inlet temperature sensor
Terminal block

Backup heater 1

*Option p.c.board

Boiler control O/P
Alerm O/P

Operation O/P

Defrost O/P

Emergency stop I/P
Hot water cylinder
thermostat I/P

Cooling thermostat I/P
Heating thermostat I/P

21

1. The one-dot chain line indicates wiring at the local site, and
the dashed line indicates accessories sold separately and
service wires, respectively.

2. , and indicates the terminal board and the numberals
indicate the terminal numbers.

3. indicates P.C. board.

* Be sure to fix the electric parts cover surely with screws.
(Otherwise water enters into the box resulting in malfunction.)

5-2. Outdoor Unit

Symbol Item nam

Compressor

Fan motor

Pulse motor valve coil

Discharge temperature sonsor

Suction temperature sensor

Heat exchange sensor 1

Heat exchange sensor 2

Outdoor temperature sensor

Compressor case thermostat

Fuse 25 A, 250 VAC

Fuse 10A, 250 VAC

Reactor

Upper

RWB

an optional accessory or service wiring.

1. indicates a terminal plate. The number inside indicates the terminal number.

2. The double-dashed line indicates a local wiring while the dashed line indicates

3. indicates a printed board.

4. For the hydro unit circuit, see the hydro unit wiring diagram.

230V

WhiteRed

50Hz

single phase

Power supply

Earth

screw

WR B

G

(White)

White)

(

White)

(

(White)

HMS-1102,

1402H-E only

Control board

Earth screw

coil

valve

4-way

power

Operating

Hydro unit

Outdoor unit

Earth screw

(Blue)

(Yellow)

input

External

22

White)

White)

(

(

White)

Yellow)

(

White)

(

(

White)(White)(White)

(

5-3. Hot Water Cylinder Unit

Green /
Yellow

AB

TB06(TTW)

To hydro unit

Blue

Double pole thermal cut out

Brown

TTW sensor

Hot water cylinder heater

Blue

Brown

12

TB03(230V)

Green /
Yellow

Supply 230 V from hydro unit
Cable size 1.5 mm

2

(minimum)

23

6 Key Electric Component Rating

6-1. Hydro Unit

HWS-802XWHM3-E, 802XWHT6-E

No. Component name

1

Circulating pump

Backup heater 6 kW

2

3

Backup heater 9 kW

Water heat exchange

4

temperature sensor
(TC sensor)

Water inlet temperature sensor

5

(TWI sensor)

Water outlet temperature sensor

6

(TWO sensor)

Heater outlet water temperature

7

sensor
(THO sensor)

Floor inlet temperature sensor

8

(TFI sensor)

9

Pressure switch

10

Low pressure sensor

11

Bimetal thermostat (auto)

Bimetal thermostat (single

12

operation)

13

Flow switch

14

Output board (OP)

15

Input board (OP)

16

Remote control

Water 3-way valve terminal

17

18

Water 2-way valve terminal

Mixing valve terminal

19

20

Circulating pump terminal

21

Booster heater terminal

22

Fuse

Model name

Type name Rating

M3-E T6-E

OO

OO –

OO –

OO –

OO –

OO –

OO –

OO –

OO –

OO –

OO –

OO –

OP OP

OP OP

OO

OO –

OO –

OO –

OO –

OO –

OO –

UPS025-65 K 130 AC230 V 0.54 A (MAX)

–

TCB-PCIN3E AC230 V 0.5 A DC24 V 1 A

TCB-PCM03E Contact input

HWS-AMS11E

AC 400 V (3N) 6 kW (AC230 V 3 kW
compatible)

AC400V (3N) 9 kW

10 kΩ (25°C)

10 kΩ (25°C)

10 kΩ (25°C)

10 kΩ (25°C)

10 kΩ (25°C)

Operating pressure 4.15 MPa +0 -0.3 MPa

Operating pressure 0.20 MPa

Operating temperature 75±3°C DC42 V / 0.2 A

Operating temperature 95±5°C AC250 V / 16 A

Operating flowing quantity 13 L/min

AC230 V 0.1 A
2Wire, 3Wire SPST, SPDT type mountable

AC230 V 0.1 A 2Wire type mountable

AC230 V 0.1 A
3Wire SPST, SPDT type mountable

AC230 V 1.0 A

AC230 V 1.0 A

AC 250 V 30 A

O ········· Applied
OP······· Optional accessory

24

HWS-1402XWHM3-E, 1402XWHT6-E, 1402XWHT9-E

No. Component name

1

Circulating pump

2

Backup heater 6 kW

3

Backup heater 9 kW

Water heat exchange

4

temperature sensor
(TC sensor)

Water inlet temperature sensor

5

(TWI sensor)

Water outlet temperature sensor

6

(TWO sensor)

Heater outlet water temperature

7

sensor
(THO sensor)

Floor inlet temperature sensor

8

(TFI sensor)

9

Pressure switch

10

Low pressure sensor

11

Thermal protector (auto)

Thermal protector (single

12

operation)

13

Flow switch

14

Output board (OP)

15

Input board (OP)

16

Remote control

Water 3-way valve terminal

17

18

Water 2-way valve terminal

Mixing valve terminal

19

20

Circulating pump terminal

21

Booster heater terminal

22

Fuse

Model name

Type name Rating

M3-E T6-E T9-E

OOO

OO –

OOO –

OOO –

OOO –

OOO –

OOO –

OOO –

OOO –

OOO –

OOO –

OOO –

OP OP OP

OP OP OP

OOO

OOO –

OOO –

OOO –

OOO –

OOO –

OOO –

UPS25-80 130 AC230 V 0.83 A (MAX)

O–

TCB-PCIN3E AC230 V 0.5 A DC24 V 1 A

TCB-PCM03E Contact input

HWS-AMS11E

AC 400 V (3N) 6 kW (AC230 V 3kW compatible)

AC 400 V (3N) 9 kW

10 kΩ (25°C)

10 kΩ (25°C)

10 kΩ (25°C)

10 kΩ (25°C)

10 kΩ (25°C)

Operating pressure 4.15 MPa +0 -0.3 MPa

Operating pressure 0.20 MPa

Operating temperature 75±3°C DC42 V / 0.2 A

Operating temperature 95±5°C AC250 V 16 A

Operating flowing quantity 18 L/min

AC230 V 0.1 A
2Wire, 3Wire SPST, SPDT type mountable

AC230 V 0.1 A 2Wire type mountable

AC230 V 0.1 A
3Wire SPST, SPDT type mountable

AC230 V 1.0 A

AC230 V 1.0 A

AC 250 V 30 A

O ········· Applied
OP······· Optional accessory

25

6-2. Outdoor Unit

HWS-802H-E

No. Component name Type name Rating

1

Compressor DA220A2F-22L

2

Outdoor fan motor ICF-280-A60-1 Output 60 W

4-way valve coil VHV-01AP552B1 AC230 full-wave rectifier input, alive time

3

4

Pulse motor valve (PMV) coil CAM-MD12TF-15 DC12 V

5

Compressor case thermostat US-622KXTMQO-SS OFF: 125±4°C ON: 90±5°C

6

Reactor CH-56 5.8 mH, 18.5 A

PC board MCC-1571 Input 1Ø, AC230 V±23 V,

7

10 sec or less

50/60 Hz

26

HWS-1102H-E, 1402H-E

No. Component name Type name Rating

1

Compressor DA422A3F-25M

2

Outdoor fan motor (x2) ICF-280-A100-1 Output 100 W

3

Reactor (x2) CH-44 1.4 mH, 25 A

4

4-way valve coil UKV-A038 AC230 V full-wave rectifier input, alive time 10 sec or less

5

Pulse motor valve (PMV) coil VHV-01AP552B1 DC12 V

6

Board MCC-1560 Input 3Ø, AC230 V±23 V, 50/60 Hz

7

Compressor case thermostat US-622KXTMQO-SS OFF = 125 ± 4 °C, ON = 90 ± 5 °C

27

6-3. Hot Water Cylinder Unit

Model name

1501

2101

No. Component name

1

Hot water cylinder heater

Hot water cylinder temperature

2

sensor
(TTW sensor)

Thermal cut-out

3

O ········· Applied

CSH
M3-E
(-UK)

OOO

OOO

OOO

CSH
M3-E
(-UK)

3001

CSH
M3-E
(-UK)

Type name Rating

– AC230 V 2.75 KW

10 kΩ (25°C)

–

–

Operating temperature
Manual reset 82°C (+3k/-2k)

28

6-4. Water Heat Exchange Control Board

HWS-802XWHM3-E, 802XWHT6-E
HWS-1402XWHM3-E, 1402XWHT6-E, 1402XWHT9-E

Option board

connector

CN208-CN211

Built-in pump

connector

CN603

Relay board connector
CN501

TC sensor connector

Remote control

connector

CN41

CN203

TFI sensor
connector
CN213

TTW sensor connector
CN214

Low pressure sensor connector
CN207, CN212

THO sensor connector
CN206

TWI sensor connector
CN204

TWO sensor connector
CN205
Pressure switch connector
CN201
Overheat protection thermostat
input connector
CN202

Flow switch connector
CN200

Transformer connector
CN102

Hot water cylinder

drive connector

CN601

3WV drive connector
CN602

Mixing valve drive
connector
CN604

Backup heater 1 drive
connector
CN605

Transformer input connector
CN101

AC power supply connector
CN100

Serial input connector
CN305

Backup heater 2 drive connector
CN606

29

6-5. Outdoor Control Board

r

HWS-802H-E

Reactor connection connecto

Power circuit protection

fuse

F100 (250 V, 3.15 A,

plastic case)

Case thermostat connector

CN609(Blue)

4-way valve connector

CN701(White)

Compressor ON
output connector

CN704(

Blue

)

Heater output connector

CN703(Grey)

External input connector

CN610(Yellow)

Special operation switches

SW801
SW804

Fan motor output
CN300 (White)

Compressor output terminals

CN202
CN201
CN200

Electrolytic capacitors

Display change-over switches

SW800
SW803

Temperature sensor connectors

TL CN604(

TD CN603(

TO CN602(

TE CN601(
TS CN600(

Alive, error display LEDs

D800 804(

Initialization switch

Hydro-outdoor communication signal LEDs

White

)

White

)

Yellow

)

White

)

White

)

Yellow

D805(

Green

PMV connector

CN710 (White)

SW802

D503 (Green, Outdoor => Hydro)

D502 (Amber, Hydro => Outdoor)

)
)

4-way valve protection
fuse
F700 (250 V, 3.15 A,
plastic case)

Connecting cable connector

CN04(White)

Connecting cable protection fuse

F03 (250 V, 10 A)

Power circuit protection
fuse
F01 (250V, 25A)

Power supply connection lead
wires
P01(Red)
P02(White)

Earth lead wire

P09 (Black)

30

HWS-1102H-E, 1402H-E

Fan motor output (Lower)
CN300(White)

Case thermostat connector
CN609(Blue)

Power circuit protection
fuse
F100(250V,3.15A,
plastic case)

4-way valve connector
CN701(White)

Compressor ON output
connector
CN704(Blue)

External input connector
CN610(Yellow)

Fan motor output (Upper)
CN400(White)

Compressor output terminals
CN202
CN201
CN200

Electrolytic capacitors

Special operation switches
SW801
SW804

Display change-over
switches
SW800
SW803

Temperature sensor

connectors

TL CN604(White)

TD CN603(White)

TO CN602(Yellow)

TE CN601(White)
TS CN600(White)

Alive, abnormal display LEDs
D800 804(Yellow)
D805(Green)

PMV connector
CN710(White)

Initialization switch
SW802

Hydro-outdoor communication

signal LEDs

D503 (Green, Outdoor =>Hydro)

D502 (Amber, Hydro => Outdoor)

4-way valve protection fuse
F700(250V,3.15A
plastic case)

Connecting cable connector
CN04(White)

Connecting cable protection fuse
F03(250V,10A)

Power supply connection
lead wires
P01(Red)
P02(White)
P03(Black)

Earth lead wire
P09(Black)

Power supply protection fuses
F01
(250V,25A)

31

7 Refrigeration Cycle / Water System Diagram

7-1. Water System Diagram

M

Fan coil unit

zone1

Boiler

(local)

Booster heater

(local)

By-pass valve

Safety valve

set : 3.5bar

(locally procured)

Motorized 3-way valve

M

AC230V

(locally procured)

Radiator unit

2-way valve for

cooling mode

(locally procured)

AC230V

Strainer

40 mesh

(locally procured)

By-pass valve

(locally procured)

(locally procured)

Drain cock for water charge

Moterized mixing valve

zone2

90°C

10 bar

Relief valve(UK)

AC230V

(locally procured)

AC pump

(locally procured)

1 : 2.75kW
Ø

Cylinder heater

TFI

Floor

heating

Buffer tank(locally procured)

set : 3bar

Pressure relief valve

Air vent valve

set : 1bar

Expansion vessel

THO

AC pump

max : 10bar

(auto)

set : 75 ± 3°C

Thermal protector

set : 95 ± 5°C

Single operation

Thermal protector

Menometer

gage : - 6bar

TWO

Pressure switch

4.15MPa

Water vent

valve

Backup heater

TWI

Flow sw

1 : 3kWØ3 : 6kWØ3 : 9kW
Ø

TC

Low pressure sensor

32

max : 10bar

Water heat exchanger

Water outlet

Pressure relief

Set value : 7bar(UK)

TTW

(manual reset)

82°C (+3k/ -2k)

Thermal cut-out

Outdoor unit

8,11,14kw

Water inlet

3.5bar

Reducing

valve(UK)

Hot water cylinder

Local hot water system

Installation example of water circuit

(1) (2)

(3) (4)

(5) (6)

The water circuit for a system without buffer tank ((1), (2), (3), (5)) requires 5 or more branches of Floor heating or
Radiator etc.

Less than 5 branches may cause a flow deficiency. In this case, please provide a buffer tank and secondary pumps
as shown in (4).

33

7-2. Refrigeration Cycle System Diagram

HWS-802XWHM3-E, 802XWHT6-E/802H-E

Heating / Hot-water supply
Defrosting / Cooling

Compressor
(DA220A2F-22L)

Accumulator
(1800 cc)

TD

TS

Outdoor unit

4-way valve
(STF-218G)

TO

Outdoor heat
exchanger

Pulse motor valve
(CAM-B30YGTF-2)

TE

Low
pressure
sensor

Pressure switch

Plate-type
water heat
exchanger

TC

Hydro unit

Expansion vessel

Manometer

TWO

Air vent valve

Backup heater

Safety valve

THO

TWI

Flow switch
(VH-8706)

Refrigerant R410A ... 1.8 kg

HWS-1402XWHM3-E, 1402XWHT6-E, 1402XWHT9-E/1102H-E, 1402H-E

Water vent valve

Circulating pump
(UPS025-65 K 130)

P

Heating / Hot-water supply
Defrosting / Cooling

Compressor
(DA422A3F-25M)

Accumulator
(2500 cc)

TD

TS

Outdoor unit

4-way valve
(STF-0401G)

TO

Outdoor heat
exchanger

Pulse motor valve
(UKV-25D100)

TE

Hydro unit

Low
pressure
sensor

Pressure switch

Plate-type
water heat
exchanger

TC

Expansion vessel

TWO

TWI

Refrigerant R410A ... 2.7 kg

Manometer

Air vent valve

Backup heater

Safety valve

Circulating pump
(UPS25-80 130)

THO

Flow switch
(VH-8705)

Water vent valve

P

34

8 Operational Description

This chapter describes the working circuit and control of Air to Water Heat Pump about the following operations.

8-1

8-2

8-3

8-4

Item

Basic Operation

1) Operation control

2)Hot water supply operation

3)Heating operation

4)Cooling operation

Operation Mode and Control Method

1)Hot water supply operation

2)Heating operation

3)Cooling operation

4)Simultaneous operation of “hot water supply" and "heating”

5)Simultaneous operation of “how water supply" and "cooling”

6)Boiler-assisted heating operation

7)HOT WATER BOOST operation

8) Anti bacteria

9)Night setback operation

10) FROST PROTECTION operation

11) AUTO operation

12) Nighttime low-noise operation

Hydro Unit Control

1)Capacity control (compressor, high-temperature release, low-temperature release)

2) Heater control

3)Circulation pump control

4) Flow switch control

5)Mixing valve control (2-temperature heating control)

6) Q-H characteristics of hydro unit

7) Automatic restart control

8)Piping anti-freezing control

Outdoor Unit Control

1) PMV (Electronic control valve) control

2)Outlet temperature release control

3)Current release control

4)Current releases shift control

5)Outdoor fan control

6)Defrosting control

7)Winding heating control

8)Continued operation prevention under short-circuit conditions

9)Overcurrent protection control

Page

36-38

39-47

48-56

57-63

35

Item Operation flow and applicable data, etc. Operation description

8-1.

Basic
Operation

1) Operation control

Remote controller

Operation
condition selection

Heating: Run/Stop
Hot water supply: Run/Stop
Cooling: Run/Stop

Serial signals transmit

and receive

Hydro
unit

Serial signals

transmit and receive

2WV_W
3WV_W

Hot water supply
heater MG

Mixing Valve

Pressure switch

Lo pressure sensor

Remote control settings
<Heating> Temperature setting
<Hot water supply > Temperature setting
<Cooling> Temperature setting

Auto Temp
Anti Bacteria
Frost protection
Hot waterboost

AC 230 V for Hot water cylinder heater

AC 400 V (3N~) for Back up heater

Thermostat (Cooling/Heating)

Forcible stop input

Water heat
exchange
Sub board

Abnormal stop output
Defrosting output
Operation output
Boiler "ON/OFF"
Booster Heater

Condensed temperature sensor (TC)
Water inlet temperature sensor (TWI)
Water outlet temperature sensor (TWO)
Water heater outlet temperature sensor (THO)

Water heat
exchange
control board

Hot water cylinder (TTW)
Floor inlet sensor (TFI)
Overheat prevention thermostat
Flow switch

1. Purpose
The operations of the
hydro unit and the
outdoor unit are
controlled according to
user-defined operation
condition settings.

2. Details
The operation controls
include those shown in
the left.

3. Operations

1) An operation condition

is selected with the
remote controller.

2) Setting the remote

controller button to
“ON” transmits a signal
to the hydro unit.

3) The hydro unit

controller controls the
operations shown in
the left while also
controlling the water 2­way valve, water 3-way
valve, circulation
pump, mixing valve,
hot water cylinder
heater, and backup
heater.

4) The hydro unit

controller transmits an
operation instruction to
the outdoor unit, and
uses serial signals to
transmit and receive
control statuses.

5) The outdoor unit

control unit performs
the operation controls
shown in the left while
also controlling the
compressor, outdoor
fan motor, pulse motor
valve, and 4-way valve.

Hot water cylinder heater
Backup heater 1 power-relay

Serial signals

transmit and receive

Backup heater 2 power-relay

AC pump 1 (Built-in pump)

Outdoor
unit

transmit and receive

Serial
communication

Serial signals

Outdoor

unit control

AC 230 V for heat pump

Outdoor unit contro
Inverter frequency control

Inverter

Waveform synthesis function

Calculation function (Temperature calculation)

AD conversion function
Rapid heating function
Compressor restart
Delay function

G-Tr overcurrent prevention function

Defrosting operation function

36

Compressor
Outdoor fan motor

Td sensor
Ts sensor
Te sensor
To sensor
PMV
4-way valve

Item Operation flow and applicable data, etc. Operation description

8-1.

Basic
Operation

2) Hot water supply operation Hot water supply operation

[HOT WATER]

button set to "ON"

Hydro unit

control

Hot water temperature: 40°C to 75

Circulation pump "ON/OFF" control
Water 3-way valve control
Hot water cylinder heater control

°C

Operation instruction

signal transmit

Number of compressor revolutions control

Outdoor unit

control

Number of outdoor fan motor revolutions control
Pulse motor valve control
4-way valve control

3) Heating operation Heating operation

ZONE1, 2

button set to "ON"

Heating temperature: 20°C to 55

°C

Circulation pump "ON/OFF" control

Hydro unit

control

Water 3-way valve control
Water 2-way valve control
Mixing Valve control
Backup heater control

Operation instruction

Booster heater control

signal transmit

Number of compressor revolutions control

Outdoor unit

control

Number of outdoor fan motor revolutions control
Pulse motor valve control
4-way valve control

Set temperature

(TSC_F)

[°C]

A(40)

B(35)
C(30)
D(25)

E(20)

T1-20

A, B, C, D, E Setting available range 20 to 55
T1 Setting available range -15 to 0
T3 Setting available range 0 to +15

0

T3 20

°C
°C

°C

1. Purpose
Hot water supply

2. Details
This section performs hot
water supply operation
according to heating
conditions specified for
the steps in the left.

3. Operations

1) Set the [HOT WATER]

remote controller
button to “ON”.

2) The hydro unit

controller starts to
transmit a hot water
supply operation signal
to the outdoor unit
control unit.

3) The hydro unit

performs the operation
controls shown in the
left while also
controlling the
circulation pump, hot
water cylinder heater
“ON/OFF”.

4) The outdoor unit

controls the
compressor, outdoor
fan motor, electric
expansion valve, and
4-way valve based on
the operation signals
transmitted by the
hydro unit.

1. Purpose
Heating

2. Details
This section performs
heating operation
according to heating
conditions specified for
the steps in the left.

3. Operations

1) Set the [ZONE1, 2]

remote controller
button to “ON”.

2) The hydro unit

controller starts to
transmit a heating
operation signal to the
outdoor control unit.

3) The hydro unit

performs the operation
controls shown in the
left while also
controlling the
circulation pump,
backup booster heater
“ON/OFF”, water 2­way valve, and water 3­way valve.

4) The outdoor unit

controls the
compressor, outdoor
fan motor, electric
expansion valve, and
4-way valve based on
the operation signals
transmitted by the
hydro unit.

37

Item Operation flow and applicable data, etc. Operation description

8-1.

Basic
Operation

4) Cooling operation

ZONE1, 2

button set to "ON"

Hydro unit

control

Cooling temperature: 10°C to 25

Circulation pump "ON/OFF" control
Water 3-way valve control
Water 2-way valve control

°C

Operation instruction

signal transmit

Number of compressor revolutions control

Outdoor unit

control

Number of outdoor fan motor revolutions control
Pulse motor valve control
4-way valve control

NOTE:

No coding mode in default setting. When use the cooling mode, please change the
FC02 to “0”.

Related FC

FC No. Setting item Default Setting available range

02 Cooling mode availability 1: No 0: Yes

1. Purpose
Cooling

2. Details
This section performs
cooling operation
according to cooling
conditions specified for
the steps in the left.

3. Operations

1) Set the [ZONE1, 2]

remote controller
button to “ON”.

2) The hydro unit

controller starts to
transmit a cooling
operation signal to the
outdoor unit control
unit.

3) The hydro unit

controller performs the
operation controls
shown in the left while
also controlling the
circulation pump, water
2-way valve, and water
3-way valve.

4) The outdoor unit

controls the
compressor, outdoor
fan motor, pulse motor
valve, and 4-way valve
based on the operation
signals transmitted by
the hydro unit.

38

Item Operation flow and applicable data, etc.

r

8-2.

Operation
Mode and
Control Method

The following shows the operation modes and controlled objects.

Operation

mode

Cooling

Controlled
object

Heat pump O O O O × × O O × × O

Backup
heater

Hot water
cylinder
heater

Heating

only

only

ЧOЧOЧЧЧЧЧЧЧ

××O×O×O×O×O

Hot

water

supply

only

Heating and Hot water Cooling and Hot water

Hot

side

Heat pump select

for hot water

supply

Heating

side

Heat pump select

for heating

Heating

side

water

supply

1) Hot water supply operation

1) Operation start condition
When the [HOT WATER] remote controller button is pressed and
the following operation start condition is met, the operation starts.

• TTW < 38°C is detected.

2) Operation mode determination

An operation mode is determined according to the temperature
of TTW sensor.

• Heat pump operation selection *1 *2

• When TTW < 38°C (a zone in the right figure) is met, the heat
pump operation is selected.

• Heater operation selection
When 45°C TTW < TSC_H (b zone in the right figure) is
met, the heater operation is selected.

• Thermostat status "OFF" selection
When TTW TSC_H is met, the thermostat status "OFF" is
selected.

3) Operation stop
The operation stops in the following cases.

• The remote controller gives a stop instruction.

• TTW TSC_H is met.

*1: When the outside temperature is -20°C or below, the heater

operation is selected even if the TTW temperature falls into "a
zone".

*2: When "Hot water supply" and "Heating" are simultaneously in

operation, the heater operation may be selected depending on
the outside air temperature.

Related FC

FC No. Setting item Default Setting available range

1E Upper limit of hot water supply temperature 75°C 60-80°C

1F Lower limit of hot water supply temperature 40°C 40-60°C

20 Heat pump start temperature 38°C 20-45°C

21 Heat pump end temperature 45°C 40-50°C

24 Outside air correction start temperature for hot water supply*

25 Outside air correction temperature for hot water supply*

3

3

*3:When the outside temperature is 0°C or below, the boil-up temperature will be higher that setting temperature in hot

water supply mode.

Heat pump select

for cooling

Hot

water

supply

side

Cooling

side

(Hot water cylinder unit)

TTW

(Temperature set with

HP_H OFF 45°C

0°C -20-10°C

3 deg 0 -15 deg

TSC_H

remote controller)

HP_H ON 38°C

TSC_H is hot water temperature
set with remote controller

Heat pump select

for hot water

Hot

water

supply

side

Cooling

side

O Possible

× Not possible

TTW senso

Thermostat OFF
Heater operation

b Zone

Heat pump
operation

a Zone

supply

c Zone

Hot

water

supply

side

39

Item Operation flow and applicable data, etc.

8-2.

Operation
Mode and
Control Method

2) Heating operation
<Operation only for ZONE1>

• This operation is enabled when DP_SW12_2 ZONE1 is set to "ON" (default).

• The remote controller displays settings, and only the set temperature of can be changed.

<Operation for ZONE1 and ZONE2 (2 temperatures control)>

• This operation is enabled when DP_SW12_2 ZONE1 is set to "ON" (default) and DP_SW12_3 ZONE2 to "ON".

• The remote controller displays settings, and the set temperatures of
can be changed.

• To set temperatures for and , use SELECT to switch and
.

• For 2 temperatures control, the flow adjustment of MIXING VALVE controls the water temperature of . For

details,
see the description on MIXING VALVE control in 8-3-5.

1) Operation start condition

Pressing the [ZONE1, 2] button of remote controller starts a
heating operation. *1 *2

2) Operation mode selection

An operation mode is determined according to the temperature
of TWI sensor.

• Heat pump operation selection *1 *2
When TWI < TSC_F (d zone in the right figure) is met, the heat
pump operation is selected.

• Thermostat status "OFF"
When TWI TSC_F (e zone in the right figure) is met, the
thermostat status "OFF" is selected.

3) Operation stop condition
When the following condition is met, the heating operation stops.

• The remote controller gives a stop instruction.

TWI

Thermostat off
operation

TSC_F

C_f = 0

Heat pump operation

TSC_F is a heating temperature
set with remote controller

e zone

diff2K
d zone

*1: When the outside temperature is -20°C or below, the heater

operation is selected even if the TTW temperature falls into "d
zone".

*2: When "Hot water supply" and "Heating" are simultaneously in

operation, the heater operation may be selected depending on
the outside air temperature.

Related FC

FC No. Setting item Default Setting available range

1A Upper limit of heating (Zone1) limited temperature 55 37-55°C

1B Lower limit of heating (Zone1) limited temperature 20 20-37°C

1C Upper limit of heating (Zone2) limited temperature 55 37-55°C

1D Lower limit of heating (Zone2) limited temperature 20 20-37°C

40

Item Operation flow and applicable data, etc.

8-2.

Operation
Mode and
Control Method

3) Cooling operation

Pressing the [ZONE1, 2] button and then [OPERATION MODE] starts a cooling operation.

1) Operation start condition
Pressing the [ZONE1, 2] button and then [OPERATION MODE]
starts a cooling operation.

2) Operation mode selection
An operation mode is determined according to the temperature
of TWI sensor.

• Heat pump operation selection *1 *2

When TWI TSC_F (d zone in the right figure) is met, the heat
pump operation is selected.

• Thermostat status "OFF"

When TWI < TSC_F (e zone in the right figure) is met, the
thermostat status "OFF" is selected.

3) Operation stop condition
When either of the following conditions is met, the cooling
operation stops.

• The remote controller gives a stop instruction.

• The operation is switched to heating.

*1: When the outside temperature is 10°C or below, cooling does

not start even if the TWI temperature falls into "d zone".

Related FC

FC No. Setting item Default Setting available range

02 Cooling mode availability 1: No 0: Yes

18 Upper limit of cooling setting temperature 25 18-30°C

19 Lower limit of cooling setting temperature 10 10-18°C

TSC_F

(Temperature set with

remote controller)

TSC_F

TWI

Heat pump operation

d zone

TSC is a cooling temperature
set with the remote controller

(cooling)

e zone

Thermostat off operation

Diff : 2k

4) Simultaneous operations of "hot water supply" and "heating"
At the time of "Hot water supply" and "Heating" simultaneous
operation, the operation mode is select as follows depending on
the outside air temperature.

• f zone Operation with hot water supply priority

A heat pump operation is performed in the hot water supply side,
and a heating operation in the heating side.

• g zone Operation with heating priority

A heat pump operation is performed in the heating side, and a
heating operation in the hot water supply side.

Operation mode by zone

Zone Hot water supply side Heating side

f Heat pump * Stop *

g Heater Heat pump

h Heater Heater

TO

D

(Note)

-20

Hot water

supply heat

pump priority

operation

Heating heat

pump priority

operation

Heater operation

f zone

Diff : 5deg

g zone

Diff : 5deg

h zone

* Note that after a heat pump operation for "Hot water supply" is selected in f zone, when the operation moves to a

heater operation for "hot water" and then 5 minutes has passed (Hot water supply operation in b zone), the operation
mode changes as follows.

Zone Hot water supply side Heating side

f' Heater Heat pump

When TTW 45°C (FC: changeable) is met, the operation ends f' zone and returns to f zone.

Related FC

FC No. Setting item Default Setting available range

Maximum HP operation time in “hot water supply” + “heating

07

mode”

22 Priority mode switch temperature (D) 0 -20-20°C

30 min 0-120min

* Note: When user selects “hot water supply” and “ZONE1,2”, and Heat pump selects hot water supply mode, the

Maximum operating time of heat pump is 30 mins.

41

Item Operation flow and applicable data, etc.

8-2.

Operation
Mode and
Control Method

5) Simultaneous operations of "hot water supply" and "cooling"

For simultaneous operations of "hot water supply" and "cooling", basically cooling runs by a heat pump operation, and
hot water supply by a heater operation.

Hot water supply side Cooling side

Normal Heater * Heat pump *

* Note that after a "cooling" heat pump operation is selected, if the thermostat off status continues for 10 minutes and

TTW < 38°C is met, the operation switches to a hot water supply operation.

Hot water supply side Cooling side

Cooling

thermostat off

10 min. passed

Heat pump Stop

When TTW 45°C (FC: changeable) is met, the operation returns to the normal mode.

6) Boiler-assisted heating operation

This operation is enabled when DPSW13_2 is ON (A boiler exists).

• I zone Heat pump operation

A heat pump operation is usually performed.

• J zone Heat pump operation + Boiler operation *1

A heat pump + boiler operations (*2) are performed, and a heater operation is performed in the Hot water supply side.

TO

Heat pump

I zone

operation

E

Heat pump

J zone

boiler operation

*1: In J zone, the hydro unit setting has a priority, and when the set temperature is reached, the boiler output also becomes

OFF.
Setting FC_3E to "1" makes the boiler has a priority, and even if the hydro unit set temperature is reached, the boiler
output remains "ON".

*2: The boiler operation only gives boiler instruction from the hydro unit through the option board.

Related FC

FC No. Setting item Default Setting available range

23 Heat pump only / Simultaneous operation switching TO

temperature (E)

3E Hydro unit setting / Boiler set temperature priority switching 0: Priority on

-10 -20-20°C

hydro unit
setting

1: Priority on boiler setting

42

Item Operation flow and applicable data, etc.

8-2.

Operation
Mode and
Control Method

7) Hot water boost operation

A hot water boost operation boils water quickly to the set temperature TSC_H = 75°C (FC_09).

1) How to operate

• When pressing the [HOT WATER BOOST] button after pressing the remote controller [HOT WATER] button, a heat

pump operation in progress in the heating side switches to in the hot water side, and continues the operation
regardless of the hot water supply start condition, TTW < 38°C. In addition, the hot water cylinder is immediately
energized to start a Hot water supply operation under TSC_H = 75°C.

• A hot water boost operation returns to the usual operation after 60 minutes.

• The remote controller display during a hot water boost operation is the same as the set temperature display of a usual

Hot water supply operation.

• The usual set temperature change is used for changing the set temperature during a hot water boost operation.

Change the BOOST set temperature with FC_09, if necessary.

HOT WATER button set to "ON"

HOT WATER BOOST button set to "ON"

Current heat pump

Heating side

operation

Hot water
supply side

Switches to Hot water

supply operation

75°C Hot water operation

60 minutes passed

Usual operation

Related FC

FC No. Setting item Default Setting available range

09 HOT WATER BOOST set temperature 75°C 40-80°C

08 HOT WATER BOOST operation time 60 mins 30-180 mins

Every 10 mins

43

Item Operation flow and applicable data, etc.

8-2.

Operation
Mode and
Control Method

8) Anti bacteria (ANTI BACTERIA) operation

An anti bacteria operation regularly performs a Hot water supply operation with the set temperature TSC_H = 75°C (can
be set with FC_0A).

1) How to operate

• Pressing the [HOT WATER] button and then the remote controller [ANTI BACTERIA] button changes the setting to

TSC_H = 75°C at the set cycle and time (both can be set with the remote controller FC) to start ANTI BACTERIA
operation.

• The first auti bacteria operation starts when press the [ANTI BACTERIA] button and starting time come.

• When the set temperature 75°C is reached after the ANTI BACTERIA operation started, the set temperature remains

another 30 minutes (can be set with FC_0B).

• The priority zone determined by the outside temperature selects an operation, Hot water heat pump or hot water

supply heater.

• The hot water heat pump operation, when selected, ignores the hot water supply start condition (TTW < 38°C) and

forcibly performs a hot water operation.

• During ANTI BACTERIA operation (Forcible hot water operation at 75°C), the hot water set temperature display is

not changed. If it is changed from the remote controller, the normal hot water set temperature will be changed.

HOT WATER button set to "ON"

ANTI BACTERIA button set to "ON"

Anti bacteria start time

75°C hot water supply operation

75°C hot water supply operation for 30 minutes

Usual hot water supply operation

(Set temperature: 40°C to 75°C)

Caution

• During a 75°C hot water supply operation with ANTI
BACTERIA, the remote controller does not display 75°C.

• Be careful not to burn yourself; Output water may be hotter
than that displayed on the remote controller.

Related FC

FC No. Setting item Default Setting available range

0A Anti bacteria set temperature 75°C 70-80°C

0B Anti bacteria holding time 30 mins 0 - 60 mins

Remote control OCAnti bacteria start time 22:00 0:00-22:00

Remote control ODAnti bacteria operation cycle 7 days Every day to 10 days

44

Item Operation flow and applicable data, etc.

8-2.

Operation
Mode and
Control Method

9) Night set back (NIGHT SET BACK) operation
A night set back operation performs heating at 5°K lower and cooling at 5°K temperatures against the remote controller

set temperature from the setting start time (22:00) to the end time (6:00) every day.

Note) • Set the remote controller time before starting a NIGHT SET BACK operation.

• The set time can be changed with remote controller FC.

Related FC

FC No. Setting item Default Setting available range

Remote controllerOENight set back start Time setting 22:00 0:00-23:00

Remote controllerOFNight set back end Time setting 6:00 0:00-23:00

26 Night set back setting Temperature width 5 deg 3 -20 deg

10) FROST PROTECTION operation
A frost protection operation performs heating at the set temperature RSC_F = 15°C (FC).

1) How to operate

• Pressing the remote controller [ZONE1, 2] button and then the [FROST PROTECTION] button starts a heating
operation at the set temperature of 15°C.

• Pressing again the [FROST PROTECTION] button cancels the FROST PROTECTION operation.

• The remote controller displays "F" as the temperature during FROST PROTECTION.

• A set temperature change during a FROST PROTECTION operation cancels the operation.

Related FC

FC No. Setting item Default Setting available range

3A FROST PROTECTION Yes / No 1: Yes 0: No

3B FROST PROTECTION Set temperature 15°C 10-20°C

45

Item Operation flow and applicable data, etc.

8-2.

Operation
Mode and
Control Method

11) AUTO operation
An auto operation sets the water temperature TSC_F depending on the outside temperature TO by following the table
below.

1) How to operate

• Pressing the remote controller [ZONE1, 2] button and then the [AUTO] button starts AUTO operation for heating. An
operation starts at the set temperature of straight -line approximation for the following: water temperature 40°C with
the outside temperature -20°C (FC), 35°C with -10 °C (T1)(FC), 30°C with 0°C (FC), 25°C with 10°C (T3), and 20°C
with 20°C (TC).

• For 2-temperature control, although Auto-Curve in ZONE2 shows 80% of that of ZONE1 (FC), the water temperature
setting does not fall below 20°C.

• During an AUTO operation, pressing again the [AUTO] button returns to the usual manual set heating operation.

• The remote controller displays "A" as the temperature during an AUTO operation.
(When 2-temperature control is enabled, the remote controller displays "A" "A".)

• Long-pressing the [AUTO] button during an AUTO operation activates the Auto-Curve FC change mode, enabling
the set Auto-Curve water temperature to be changed in the ±5K range. (FC_27)

• Even if the temperature setting is changed during an AUTO operation, the operation continues.

• An AUTO operation works with a heating operation only, not with a cooling or a hot water supply operation.

Auto-Curve
ZONE1

40(A)

35(B)
30(C)
25(D)

20(E)

Auto-Curve
ZONE2

-20

-10

(T1)

010

(T3)

20

Related FC

FC No. Setting item Default Setting available range

27 Set temperature shift with heating set to Auto 0 -5 to 5 k

29 Outside air temperature T1 temperature -10°C -15-0°C

2B Outside air temperature T3 temperature 10°C 0-15°C

2C Set temperature when out side air temperature is -20 °C. 40°C 20-55°C

2D Set temperature when out side air temperature is -10 °C (T1). 35°C 20-55°C

2E Set temperature when out side air temperature is 0 °C. 30°C 20-55°C

2F Set temperature when out side air temperature is 10 °C (T3). 25°C 20-55°C

30 Set temperature when out side air temperature is 20 °C. 20°C 20-55°C

31 Auto-Curve ratio of

ZONE2

80% 0-100%

46

Item Operation flow and applicable data, etc.

8-2.

Operation
Mode and
Control Method

12) Nighttime low-noise operation
A night time low-noise operation reduces operation frequency and the number of outdoor fan rotations for a certain period
during nighttime as noise control for neighborhood.

Maximum operation frequency 40.2 Hz (Hot water supply/ Heating/ Cooling)
Maximum fan tap 460 rpm (802H-E)

500 rpm (1102H-E, 1402H-E)

The nighttime low-noise operation is enabled/ disabled by changing the remote controller FC_09.

<How to set>

1) Press the TEMP. and TEST button at the same time for 4 seconds or longer. (Shifted to the nighttime low­noise setting mode)
The Code No. field displays "09", and the DATA "0000", , and being displayed blink.

2) Press TIME to set enable "1" or disable "0".
Pressing SET change DATA and display to be lit and the setting is confirmed.
(When "1" as enable is set, the nighttime low-noise setting is enabled, the control starts at the set start time.)

3) Press TEST to exit the nighttime low-noise time setting mode. The and goes out, returning to its original
status.

47

Item Operation flow and applicable data, etc.

8-3.

Hydro Unit
Control

1) Capacity control (compressor, high-temperature release, low-temperature release)

This unit controls the compressor frequency and heater output so that the water outlet temperature matches the remote
controller set temperature.

1-1) Compressor control

• Calculates the different between the remote controller set temperature (TSC_H, TSC_F) and the water outlet
temperature (Hot water supply: THO, Heating: TWO).

• Sets the Hz signal correction amount that determines the number of compressor rotations by the temperature
difference.

• Detects the number of compressor rotations.

• Compares the Hz signal correction amount and the current operation Hz, and changes the compressor output
according to the difference.

* The control details are the same for hot water supply, heating, and cooling.

Remote controller

Temperature settings

(TSC_H, TSC_F)

TSC_H-THO for hot water supply

TSC_F-TWO

for heating/cooling

Hz signal correction

Number of compressor

rotation detection

Hz signal correction Operation Hz

Inverter output change

Number of compressor

rotation change

Hydro unit

Water outlet temperature

(THO, TWO)

Compressor frequency changeable range 10 Hz to 70 Hz (802, 1402H-E)

10 Hz to 60 Hz (1102H-E)

48

Item Operation flow and applicable data, etc.

8-3.

Hydro Unit
Control

1-2) High temperature release control

A heat pump operation is performed as shown in the table below according to the TC sensor detecting temperature.

• For the detected temperature, TC (= TWO + 2 degree) of a heat pump operation is used. The values of T7 through
T10 vary depending on TWI. (See the table below)

• If the compressor frequency instruction from the hydro unit is less then 10 Hz, the compressor stops.

• TC > 62°C causes the compressor to stop abnormally. When the compressor restarts 140 seconds after the stop
and TC > 62°C is not detected for 20 minutes, the abnormal stop counter is cleared. 10 times of compressor
abnormal stop stops the operation of heat pump, and confirms the abnormality (Display: A11).

* If the heat pump operation is switched to other operation, the abnormality detection counter is reset to 0.

TC (TWO+2)

T11

(62.0°C)

T10

T9
T8

R1
(slow up)

T7

Forcible stop
O (down)

P (slow down)
Q (keep)
R2 (slow up)

S (normal)

Zone Control operation

R1 Increase compressor frequency by 1.2 Hz every

60 secs.

R2 Increase compressor frequency by 0.6 Hz every

60 secs.

O Decrease compressor frequency to 70% every

10 secs.

P Decrease compressor frequency by 3 Hz every

10 secs.

Q Keep compressor frequency.

TC=TWO+2deg (°C)

TWI T7T8T9T10T11

TWI<30 57.0 59.0 60.0 61.0 62.0

30 TWI<35 57.0 59.0 60.0 61.0 62.0

35 TWI<40 56.5 58.5 59.5 60.5 62.0

40 TWI<45 56.5 58.5 59.5 60.5 62.0

45 TWI<50 56.0 58.0 59.0 60.0 62.0

50 TWI 56.0 58.0 59.0 60.0 62.0

1-3) Low temperature release control

A heat pump operation is performed as shown in the table below according to the TC sensor detecting temperature.

• For the detected temperature, TC = TWO of a heat pump operation is used. The values of T7 through T10 varies
depending on TWI. (See the table below)

• If the compressor frequency instruction from the hydro unit is less then 10 Hz, the compressor stops.

• TC < 3°C causes the compressor to stop abnormally. When the compressor restarts when 140 seconds has
passed after the stop and TC < 3°C is not detected for 20 minutes, the abnormal stop counter is cleared. 10 times
of compressor abnormal stop stops the operation of heat pump, and confirms the abnormality (Display: A11).

* If the heat pump operation is switched to other operation, the abnormality detection counter is reset to 0.

TC (TWO)

S (normal)

T7
T8

T9

T10

R1
(slow up)

R2 (slow up)
Q (keep)

P (slow down)
O (down)

T11

Forcible stop

TC=TWO (°C)

TWI T7T8T9T10T11

TWI<10 10.0 8.0 6.0 4.0 3.0

10 TWI<15 10.5 8.5 6.5 4.5 3.0

15 TWI<20 11.0 9.0 7.0 5.0 3.0

20 TWI 11.5 9.5 7.5 5.5 3.0

49

Zone Control operation

R1 Increase compressor frequency by 1.2 Hz every

60 secs.

R2 Increase compressor frequency by 0.6 Hz every

60 secs.

O Decrease compressor frequency to 70% every

10 secs.

P Decrease compressor frequency by 3 Hz every

10 secs.

Q Keep compressor frequency.

Item Operation flow and applicable data, etc.

8-3.

Hydro Unit
Control

2) Heater control
2-1) Hot water supply operation

During a hot water heat pump operation, the unit energizes the hot water cylinder heater (2.75 kW) when all the
following conditions are met. Note that when the hot water supply set temperature (TSC_F) is reached, the unit stops
energizing the heater.

• When 30 minutes has passed after the hot water heat pump operation started.

• The water inlet temperature (TWI) reaches 50°C.

• The hot water cylinder sensor reaches the HP_OFF temperature (45°C-FC).

• The HP_ON temperature (38°C-FC) is reached without the hot water HP status.

• HOT WATER BOOST operation is in progress.

TTW

Z zone

85

Y zone
Heater off

TSC_H

HP_OFF(45)

2-2) Heating operation

1) Heater control at the time of heat pump operation

• Object to be controlled: Backup heater
The backup heater control starts when 13 minutes has passed after the heating heat pump operation started and
select the ZONE (A-D). The backup heater control increases, decreases, or maintains the number of heaters
every 10 minutes (FC) depending on the difference between the heating set temperature (TSC_F) and the heater
outlet temperature (THO). When the heating set temperature (TSC_F) is reached, the hydro stops energizing
the backup heater.

THO

70

TSC_F-2

TSC_F-4

TSC_F-6

X zone
Heater on

(Heater on without
hot water HP)

E zone

D zone

C zone

B zone

A zone

Abnormality detection

Abnormality detection

Diff : 2K

TSC_H-4

Hot Water Boost
Heater on only with
Hot Water Boost in operation

HP_ON (38)
(Hot water HP start)

Diff : 2K

Heater off

Heater output down every
5, 10, 15, or 20 minutes

Diff : 2K

KEEP

Diff : 2K

Heater output up every
10, 20, 30, or 40 minutes

Status Heater ON / OFF

Heater 1 Backup heater 3 kW = ON

Heater 2 Backup heater 9 kW = ON

The single-phase model of 3 kW has the backup heater 1 only.
The three-phase model of 6 kW has heater 1+2 of 6 kW.

50

Item Operation flow and applicable data, etc.

8-3.

Hydro Unit
Control

2) Control at the time of heating heater operation

• Controlled Object: Backup heater, Booster heater
The backup heater control starts when 13 minutes has passed after the heating heat pump operation started.
The backup heater control increases, decreases, or maintains the number of heaters every 10 minutes (FC)
depending on the difference between the heating set temperature (TSC_F) and the heater outlet temperature
(THO). Note that when the heating set temperature (TSC_F) is reached, the unit stops energizing the heater.

THO

E zone

70

D zone

TSC_F-0

C zone

Abnormality detection

Diff : 2K

Heater off

Heater output down every
5, 10, 15, or 20 minutes

TSC_F-2

B zone

TSC_F-4

A zone

Diff : 2K

KEEP

Diff : 2K

Heater output up every
10, 20, 30, or 40 minutes

Status Heater ON / OFF

Heater 1 Backup heater 3 kW = ON

Heater 2 Backup heater 9 kW = ON

Heater 3 Heater 2 + Booster heater

The single-phase model of 3 kW has the backup heater 1 only.
The three-phase model of 6 kW has heater 1+2 of 6 kW.
Contact point output only is available for booster heater.

Related FC

FC No. Setting item Default Setting available range

20 Hot water supply heat pump start temperature 38°C 20-45°C

21 Hot water supply heat pump stop temperature 45°C 40-50°C

33 Heater control of down time 1:10 mins 0:5 mins 2:15 mins 3:20 mins

34 Heater control of up time 0:10 mins 1:20 mins 2:30 mins 3: 40 mins

2-3) Heater control at the time of defrosting

• Object to be controlled: Backup heater
When a defrosting operation starts during the heating heat
pump operation, the unit energizes a backup heater (3 kW)
according to the heater outlet temperature sensor (THO) and
the set temperature (TSC_F) as follows.

TSC_F-β (β=2)

TSC_F-α (α=4)

THO

TSC_F

Heater off

Heater 1
Heater 1

1) When the heater outlet temperature sensor (THO) drops to
the temperature of 2°C below the set temperature

Defrosting ends according to the usual heater control.

Status Heater ON / OFF

Heater 1 Backup heater 3 kW = ON

2-4) Forcible heater energization

To prevent freeze, the unit energizes or stops energizing a backup heater (3 kW) regardless of the unit status, not
operated or in operation.

• Object to be controlled: Backup heater

1) Energization start condition: TWO < 4 or TWI < 4 or THO < 4

2) Energization stop condition: TWO 5 and TWI 5 and THO 5

Defrosting ends according to the usual heater control.

2-5) No heater operation

According to the DP_SW11 setting, the unit switches the energize/ not energize for the hot water cylinder, backup
heater, and booster. For details, see 10-1.

51

Item Operation flow and applicable data, etc.

8-3.

Hydro Unit
Control

3) Circulation pump control
One circulation pump (enhancing pump P2) can be connected to the unit in addition to the built-in circulation pump P1.
DP_SW10-1, 3 within the water heat exchanger enables the built-in pump P1 to be set either to usual energization or
only HP and backup heater energization, and also enables the enhancing pump P2 to be set either to interlocked or
non-interlocked with the built-in pump.

Item Heater ON / OFF Initial value Switch

AC pump

Existence &
position setting

01: None

02: None

03: Enhanced pump (P2)

Interlock / Non-interlock with
built-in pump

04: None

OFF: Interlock

*2

*1 The pump 1 in HP operates only in hot water supply side.
*2 Setting the enhancing pump P2 to non-interlock sets the pump P1 to usual energization.

3-1) Circulation pump (Built-in pump P1)

Pump type: AC motor, rated voltage 230V, manually changeable 3-level pump speed

The pump operation starts when the following condition is met.

• The [HOT WATER] or [ZONE1, 2] button is pressed.

The pump operation ends when the following condition is met.

• Pressing the [HOT WATER] or [ZONE1, 2] button stops the about 1 minute later.

The pump operation stops or re-starts as follows:

• Stops for 30 seconds when the operation mode changes.

• Stops the pump when a boiler instruction is given and 70°C TWI or TWO or THO is met.

• Re-starts the pump when a boiler instruction is given and 65°C > TWI and TWO and THO is met.

SW10-3

Operation when DP_SW10-1 "ON: HP operation only" is selected

• The pump stops only when the hot water cylinder heater is in operation. The pump does not stop with the heating
thermostat off.

3-2) Circulation pump (Enhanced pump P2)

Pump type: AC motor, rated voltage 230V, directly connectable to the unit with the rated output of up to 200W.
DP_SW10-3 enables the pump P2 to be set either to interlock or non-interlock with the built-in pump P1. Setting to
non-interlock sets the pump1 to usual energization.

4) Flow switch operation

Setting the flow switch to On or OFF determines whether water flows in the water heat exchanger.

Model Criteria for water flowing Criteria for water not flowing

HWS-802**-E Flow 13 L/min or more Flow less than 13 L/min

HWS-1402**-E Flow 17.5 L/min or more Flow less than 17.5 L/min

When start the hot water supply, heating, or cooling operation, failure to determine whether water flows does not energize
HP, the backup heater, and booster heater. The "A01" error code display also blinks in this case.

52

Item Operation flow and applicable data, etc.

8-3.

Hydro Unit
Control

5) Mixing Valve control (2-temperature heating control)
To set different radiator unit supply temperatures or floor heating supply temperatures, the unit performs Mixing Valve

control.
When Mixing Valve "Yes" is selected, the unit controls Mixing Valve every 4 minutes (FC) based on the difference TSC_Δ
T between the Zone2 set temperature and TFI (floor inlet water temperature sensor) temperature as follows:

TSC_ΔT2 TSC_ΔT -2 TSC_ΔT < 2 -2 > TSC_ΔT

Control value + 1 step (Open) ± 0 step - 1 step (Close)

Initial value Driving range 1 step Control cycle

6 0-12 3 WV move 7.5 degs 4 mins (FC)

For 2-temperature control, DP_SW12-3 Zone2 "Yes" must be selected.

Related FC

FC No. Setting item Default Setting available range

0C Mixing Valve operation time 60 30 - 240 secs

59 Mixing Valve control time 4 1 - 30 mins

6) Q-H characteristics of hydro unit
The following shows the Q-H characteristics.

6-1) HWS-801XWHM3-E, T6-E

Hydraulic heat exchanger(8kW)QH characteristics

Minimum flow rate

8

7

6

5

4

Pump head(m)

3

2

Out of

1

Operation
Range

0

10 15 20 25 30

6-2) HWS-1402XWHM3-E, T6-E, T9-E

Hydraulic heat exchanger(14kW)QH characteristics

10

9
8
7
6
5
4

Pump head(m)

3

Out of Operation
Range

2
1
0

0 5 10 15 20

SW3

SW2

SW1

Flow rate(L/min)

Minimum flow rate

SW3

SW2

SW1

25 30 35 40 45 50 55 60 65

Flow rate(L/min)

53

Item Operation flow and applicable data, etc.

8-3.

Hydro Unit
Control

7) Automatic restart control
The unit records operation information before a power outage and retrieves the information after the power is on again
to restart automatically the operation with the information.

7-1) Operation during remote controller

• The operation status before a power outage automatically restarts after the power is on again. (The merit functions
are also enabled)

• Approximately 6 hours or more after a power outage
The operation status before a power outage automatically restarts after the power is on again.
But the merit functions (Night Set Back, Anti Bacteria) are disabled.
The remote controller time displays "--:--". (The merit functions are disabled)

7-2) Operation during forcible automatic operation

A forcible automatic operation is performed when the power is on again after a power outage.

7-3) Operation during defrosting operation

When the power is on again after a power outage, the usual operation restarts.
Note: The operation details recorded before a power outage

Operation mode: Hot water supply, Heating, Cooling, Hot water supply + Heating, Hot water supply + Cooling
Set temperature: Hot water set temperature, Heating set temperature, Cooling set temperature

Merit function: Hot water supply operation (Anti Bacteria)

8) Piping freeze prevention control
This control operates when the power is on regardless the remote controller setting ON or OFF.
To prevent frost bursting of the water piping for hot water supply and heating, the unit flows water with the circulation
pump when the temperature sensor value falls below a certain temperature.

Heating operation (Night Set Back)

8-1)Piping freeze prevention control 1

1) Start condition: TWO < 4°C or THWI < 4°C.or THO < 4°C

2) End condition: TWO 5°C and TWI 5°C and THO 5°C

3)-1 How to operate (circulation pump)

• When the circulation pump is not in operation, if the sensor detects the freeze prevention control start
temperature, the unit operate the circulation pump.

• During a freeze prevention operation, a heat pump operation does not start.

• When neither [HOT WATER] nor [ZONE1, 2] is in operation, if the end condition is not met when 3 minutes has
passed after an operation starts, the unit performs the operation in 3)-2 to prevent freeze.

3)-2 How to operate (circulation pump + backup heater)

• When neither [HOT WATER] nor [ZONE1, 2] is in operation, if the end condition is not met when 3 minutes has
passed after an operation starts.

• End condition: TWO 5°C and TWI 5°C and THO 5°C

• Heating with the set temperature 55°C operates.

3)-3 Abnormal stop

• If a freeze prevention operation continues for 30 minutes and does not meet the end condition, the operation
stops as abnormal stop. (Remote controller check code: A5)

54

Item Operation flow and applicable data, etc.

8-3.

Hydro Unit
Control

8-2) Piping freeze prevention control 2

TC and TWO activates freeze prevention regardless of a heat pump operation mode.

1) Determination condition: TWO>20°C, 2*TC+TWO<-12°C is continuously detected for 30 seconds or longer. Or
TWO 20°C, TC+TWO<4°C is continuously detected for 30 seconds or longer.

2) Determination cancellation conditions

• The stop or operation mode is changed by the remote controller

• The mode is defrosting at the time of determination

At the next time of defrosting, the start condition is not met.

• The mode is other than defrosting at the time of determination

After cooling, heating, hot water heat pump restarts, the start condition is not met for 10 minutes.

3) Error display

• If freeze determination cancellation condition is not met, A4 error is displayed.

8-3) Piping freeze prevention control 3

This control applies only when defrosting is in operation.

1) Determination condition: During defrosting, TWI 15°C is continuously detected for 30 seconds or longer (After
the stop, the unit restarts.)

2) Determination cancellation condition

• At the next time of defrosting, the start condition is not met.

3) Error display

• If freeze determination cancellation condition is not met, A4 error is displayed.

8-4) Piping freeze prevention control 4

When the value of Ps sensor is low, freeze prevention is activated regardless of a heat pump operation mode.

1) Determination condition: Lo pressure sensor detects PS < 0.2 MPa and 30 seconds passes (defrosting and

2) Determination cancellation condition

• After a restart, the start condition is not met for 30 minutes.

• At the next time of defrosting, the start condition is not met. (Defrosting operation for heating or hot water supply)

3) Error display

• If freeze determination cancellation condition is not met, A8 error is displayed.

cooling) (During a defrosting operation for cooling and heating, or hot water supply)
Lo pressure sensor detects PS < 0.2 MPa and 10 minutes passes (heating and hot water
supply operation)

9) High return water protect control.
The hydro unit protects against high return water which made by separate boiler system.

TWI, TWO, THO

70

When A02 error appeared, the built-in pump will stop.

A02 error detect

(Diff : 2K)

Normal operation

55

Item Operation flow and applicable data, etc.

CLOSE

CLOSE

Open

Open

CLOSE

CLOSE

Open

Up

Lower

L'incrémentation de 1 °C est modifiable FN 35
L'intervalle de consultation en fermeture (demande) en minutes aussi ( x 5mn )
FN 36
L'intervalle de consultation en ouverture (non-demande) en minutes aussi ( x

5mn ) FN 37

3. Hydro Unit
Control

10) Room temperature thermostat control (Option
board TCB-PCM03E is necessary. Connect
the connection cable to the water heat
exchange board CN211.)
When the room thermostat is connected and
heating or cooling operates with DP_SW12-4
set to ON, an room thermostat operation is

TCB-PCMO3E

performed.

Terminal label

10-1)Heating thermostat operation

When the heating room thermostat is OPEN, the usual heating AUTO operation is performed.
After 30 minutes has passed, if the heating room thermostat continues to be in the OPEN status, the operation raises
the water temperature by 1 degree every 30 minutes. The same heater control as that of the usual HP operation
applies to the backup heater and booster heater.

When the heating room thermostat is CLOSE, the heat pump performs thermostat off. During the thermostat off, the
operation lowers the set water temperature by 1 deg every 30 minutes. When the thermostat off is completed, the
backup heater and booster heater stops being energized.

10-2)Cooling thermostat operation

When the cooling room thermostat is CLOSE, the usual cooling operation is performed. (Initial set water temperature
20°C)
After 30 minutes has passed, if the room thermostat continues to be in the OPEN status, the operation lowers the
water temperature by 1°C every 30 minutes.

PJ17

CN210
Red

CN211
Black

When the cooling room thermostat is OPEN, the heat pump performs thermostat off. During the thermostat off, the
operation raises the set water temperature by 1 degree every 30 minutes.

Indoor thermostat

contact point

OPEN Setting shift UP Thermostat ON

CLOSE Setting shift DOWN Thermostat OFF

Correction control Heating operation Cooling operation

Up water temperature by 1 deg every 30
mins

Lower water temperature by 1 deg every
30 mins

Thermostat OFF
Lower water temperature by 1 deg every
30 mins

Thermostat ON
Up water temperature by 1 deg every 30
mins

11) Forcible stop control (Option board TCB-PCMO3E is necessary. Connect the connection cable to the water heat
exchange board CN210.)

• When CLOSE occurs between "HEAT" and "COM" of TCB-PCM03E, the RED LED on the option board lights and

the operation (hot water supply, heating, cooling) stops. To restart the operation, use the operation button of the
remote controller.

12) Output signal control 1 (Option board TCB-PCIN3E is necessary. Connect the connection cable to the water heat
exchange board CN208.)

• If an error detecting signal is output, CLOSE occurs between the terminal 1 and 2.

• If a boiler output signal is output, CLOSE occurs between the terminal 3 and 4.

• In either signal above is output, the red LED on the Option board lights.

13) Output signal control 2 (Option board TCB­PCIN3E is necessary. Connect the connection
cable to the water heat exchange board
CN209.)

TCB-PCIN3E

PJ20

CN208
Blue

• When defrosting is in operation, CLOSE

occurs between the terminal 1 and 2.

• When the compressor is in operation,

CLOSE occurs between the terminal 3 and

4.

In either signal above is output, the red LED on
the OP board lights.

Terminal label

CN209
Green

56

Item Operation flow and applicable data, etc.

8-4.

Outdoor unit
control

1) PMV (Pulse motor valve) control

Valve opening is controlled using the expansion valve with a pulse motor according to a heat pump operation status.

• PMV is controlled between 30 and 500 pulses during an operation.

• At the time of a cooling operation, PMV is controlled with the usual target value of 1 to 4 K temperature difference
between TS sensor and TC sensor.

• At the time of a hot water supply or heating operation, PMV is controlled with the usual target value of 2 to 4 K (for
802H-E) or -1 to 4 K (for 1102, 1402H-E) temperature difference between TS sensor and TE sensor.

• For both cooling and heating, if the cycle is overheated, PMV is controlled using the TD sensor.The usual target value
is 91°C for a cooling operation, and 96°C for a heating operation.

* A defective sensor may cause liquid back flow or abnormal overheat of the compressor, significantly shortening the

compressor life. If the compressor or other equipment is repaired, first check that the resistance of each sensor or
the refrigerant cycle has no problem, then start the operation.

2) Discharge temperature release control
This control detects an abnormality of the refrigerant cycle or compressor to perform failure prevention.

• This control reduces operation frequency if the PMV control does not lower the outlet temperature or if the outlet
temperature rapidly rises. The frequency control is broken down to the unit of 0.6 Hz to stabilize the cycle.

• If the discharge temperature detects the abnormal stop zone, the compressor stops and then restarts after 150
seconds. The abnormality detection counter is cleared when the operation continues for 10 minutes. If detected 4
times, the error code is displayed and the compressor does not restart.

* An abnormality could occur due to too less refrigerant, PMV defective, or cycle stuck.

• For details about an error displayed, see the check code list.

TD [°C]

Abnormal stop

111

Frequency normal down

109

Frequency slow down

106

Frequency hold

103

96

Frequency slow up

(up to the point instructed)

As instructed

57

Item Operation flow and applicable data, etc.

8-4.

Outdoor unit
control

3) Current release control
The number of compressor rotation is controlled so that current value of the compressor drive circuit does not exceed the

specified value.

• The outdoor unit detects the input current.

• The outside air temperature is detected and used to set the specified value of current.

• The number of compressor rotation instructed by the hydro unit is used to determine whether the current value
exceeds the specified value.

• If exceeds, the number of compressor rotation is reduced to the most approximate number instructed by the hydro
unit within the specified value range.

Outdoor unit current inverter

Outside air temperature (TO)

Main circuit control current

Current release point setting

Operation current Settings

Yes

Compressor operation Hz down

No

Current degradation

Capacity control continue

Heating

Outside temperature

TO (degree °C)

35 TO 12.0 12.0

15 TO < 35 20.0 - (To - 15) × 0.4 20.0 - (To - 15) × 0.4

TO < 15 20.0 20.0

Cooling

Outside temperature

TO (degree °C)

44 TO 9.5 15.0

39 TO < 44 13.0 17.7

10 TO < 39 16.0 20.0

No cooling operation available for TO < 10°C.

Current release value (A)

802H-E 1102, 1402H-E

Current release value (A)

802H-E 1102, 1402H-E

CT(A)

20.0

12.0
15 35 TO

4) Current releases shift control
During a cooling operation, this control prevents the electronic parts, such as a compressor drive element, and

compressor from failing.

• The current release control value (I) is selected from the following table according to the TO sensor value.

Current release control value (I)

Temperature range 802H-E 1102H-E 1402H-E

50°C TO 10.5 14.1 14.1

45°C TO < 50°C 10.5 14.1 14.1

39°C TO < 45°C 14.0 14.1 16.4

TO < 39°C 16.0 14.1 16.4

TO abnormal 10.5 14.1 14.1

58

Item Operation flow and applicable data, etc.

8-4.

Outdoor unit
control

5) Outdoor fan control
The outdoor side control part controls the number of fan motor rotations by receiving an operation instruction from the

indoor side (Hydro unit) control part.

* Although the fan motor is a DC motor, which has non-step variable numbers of rotations, it is limited to some steps for convenience of

control.

The number of fan tap rotation allocation [rpm]

W1 W2 W3 W4 W5 W6 W7 W8

802H-E 200 230 260 300 340 380 420 460

1102,
1402H-E

802H-E 520 570 600 630 670 710 740

1102,
1402H-E

Upper 200 240 240 260 320 380 480 500

Lower 200 200 200 280 360 400 500 520

W9 WA WB WC WD WE WF

Upper 530 610 640 660 720 780 890

Lower 550 630 660 700 740 820 910

5-1) Cooling fan control

• The TL sensor, TO sensor and operation frequency control the outdoor fan. The control is performed by 1 tap of
the DC fan control (14 taps).

• For 60 seconds after the start, the maximum fan tap for each zone that is shown in the following table is fixed. After
that, the fan is controlled according to the TL sensor temperature.

TL [°C]

58

WE tap

55

+ 1 tap/20 secs
(Up to the maximum number of rotation for each zone)

38

Number of rotation hold

35

- 1 tap/20 secs
(Up to the minimum number of rotation for each zone)

HWS-802H-E

Temperature range

38°C TO W6 WC W8 WE WA WE

29°C TO < 38°C W5 WB W7 WD W9 WD

15°C TO < 29°C W4 W8 W6 WA W8 WC

5°C TO < 15°C W3 W6 W5 W8 W7 WA

0°C TO < 5°C W2 W4 W4 W6 W5 W8

-4°C TO < 0°CW2W3W3W5W4W6

TO < -4°C OFF OFF OFF W2 OFF W3

TO abnormal OFF WC OFF WE OFF WE

Less than 20 Hz

Minimum Maximum Minimum Maximum Minimum Maximum

HWS-1102H-E, 1402H-E

Temperature range

38°C TO W6 WC W8 WC WA WD

29°C TO < 38°C W5 WB W7

15°C TO < 29°C W4 W8 W6 WA W8 WC

5°C TO < 15°C W3 W6 W5 W8 W7 WA

0°C TO < 5°C W2 W4 W4 W6 W5 W8

-4°C TO < 0°CW2W3W3W5W4W6

TO < -4°C W1W2W1W4W2W6

TO abnormal W1 WC W1 WC W2 WD

Less than 20 Hz

Minimum Maximum Minimum Maximum Minimum Maximum

20 Hz or more to less

than 45 Hz

20 Hz or more to less

than 45 Hz

WC

(WB for 1102)

45 Hz or more

45 Hz or more

W9 WC

59

Item Operation flow and applicable data, etc.

8-4.

Outdoor unit
control

5-2) Hot water supply and heating fan control

1) The TE sensor, TO sensor and operation frequency control the outdoor fan.

(The minimum W1 to the maximum are controlled according to the table below.)

2) For 3 minutes after the start, the maximum fan tap for each zone that is shown in the following table is fixed. After

that, the fan is controlled according to the TE sensor temperature.

3) If TE 24°C continues for 5 minutes, the operation stops. No error code is displayed for this; the status is the same

as the usual thermostat off. The operation restarts after 150 seconds. This intermittent running is not abnormal.

4) If the situation in 3) frequently occurs, the possible cause is that the filter in the air inlet part of the hydro unit is

dusty. Clean the filter, and restart the operation.

TE [°C]

-2 tap/20 secs (to W1)
Stop time count

24

-2 tap/20 secs (to W1)

21

-1 tap/20 secs (to W1)

18

Number of revolutions hold

15

+ 1 tap/20 secs
(Up to the maximum tap for each zone)

For 802H-E

Temperature range

10°C TO W7 W8 W9

5°C TO < 10°C W9 WB WD

-3°C TO < 5°C WD WD WE

-10°C TO < -3°C WE WE WE

TO < -10°C WF WF WF

TO abnormal WF WF WF

Less than 20 Hz

Maximum Maximum Maximum

20 Hz or more to less

than 45 Hz

45 Hz or more

For 1102H-E

Temperature range

10°C TO W7 W8 W9

5°C TO < 10°C W9 WA WA

-3°C TO < 5°C WA WA WB

-10°C TO < -3°C WB WB WB

TO < -10°C WD WD WD

TO abnormal WD WD WD

Less than 20 Hz

Maximum Maximum Maximum

20 Hz or more to less

than 45 Hz

45 Hz or more

For 1402H-E

Temperature range

10°C TO W7 W8 W9

5°C TO < 10°C W9 WA WB

-3°C TO < 5°C WB WB WC

-10°C TO < -3°C WC WC WC

TO < -10°C WD WD WD

TO abnormal WD WD WD

Less than 20 Hz

Maximum Maximum Maximum

20 Hz or more to less

than 45 Hz

45 Hz or more

60

Item Operation flow and applicable data, etc.

8-4.

Outdoor unit
control

6) Defrosting control
This control defrosts the outdoor heat exchanger. The temperature sensor (TE sensor) of the outdoor heat exchanger

determines frost formation, and then defrosting is performed in the 4-way valve reverse defrosting method.

1) During a heating operation, defrosting is performed when the TE sensor meets any of the conditions in A through D
zones.

2) During defrosting, when TE sensor maintains 12°C or higher for 3 seconds or 7°C TE < 12°C for a minute, the
defrosting ends. Also, when defrosting continues for 10 minutes even if the TE sensor temperature is below 7°C, the
defrosting ends.

3) After the defrosting, stop the compressor for approx. 40 seconds before starting a heating operation.

4) Switching the jumper "J805" and "J806" of the outdoor control board can change the time of d above mentioned.
(Factory setting: 150 minutes)

Heating operation starts

0 10 15 39 45 55 d

TE

°C]

[

-2

-5

A zone

[min]

-10

B zone

-23

2

(-25)*

*1

A Zone Maintain " (TEO - TE) - (ToO - To) 3°C" for 20 secs

B Zone Maintain " (TEO - TE) - (ToO - To) 2°C" for 20 secs

C Zone

D Zone Accumulate compressor operation status of TE < -2°C for 150 mins

A Zone Maintain " TEO - TE 3°C" for 20 secs

B Zone Maintain " TEO - TE 2°C" for 20 secs

C Zone

D Zone Accumulate compressor operation status of TE < -2°C for 150 mins

C zone

To Normal

Maintain " TE -23°C" for 20 secs (1102, 1402H-E)

Maintain " TE < -25°C" for 20 secs (802H-E)

To Normal

Maintain " TE -23°C" for 20 secs (1102, 1402H-E)

Maintain " TE < -25°C" for 20 secs (802H-E)

D zone

*1 In 10 to 15 minutes after the heating

operation starts, the lowest value of
TE is recorded as TEO, and the
lowest temperature of To as ToO.

2

*

Inside brackets: For 802H-E

Jumper switching O: Short circuit ×: Open

J805 J806 d (1102,1402H-E) d (802H-E)

O O 150 mins (Factory setting) 150 mins (Factory setting)

O × 90 mins 90 mins

× O 60 mins 60 mins

× × 30 mins 30 mins

Compressor

Outdoor fan

4-way valve

Outdoor PMV

ON

OFF

ON

OFF

ON

OFF

500pulse
200pulse

0pulse

0s 30s 40s

Defrosting operation

0s 30s10s 40s

61

Item Operation flow and applicable data, etc.

8-4.

Outdoor unit
control

7) Winding heating control

1) This control energizes the inactive compressor instead of the case heater to warm the compressor. The purpose is
to prevent the refrigerant from staying inside the compressor.

2) After the unit is installed, failure to perform energization for the given time period may cause the compressor to fail.
Also, when starting an operation long after the power left off, first energize the compressor before starting the
operation in the same way as a trial run.

3) Energization is determined by the TD sensor and TO sensor. If the TO sensor fails, the TE sensor automatically takes
over the operation. Determine whether the TO sensor fails by checking the LED outside.

4) If TD is 30°C or higher, the energization stops.

(Usual)

TO

Not energized

Intermittently energized
10 mins: ON / 5 mins: OFF

*Energization
condition
TD 30°C

18
15

10

°C
°C

°C

Output "equal to 40W"

8

°C

Continuously energized
Output "equal to 40W"

(when TO sensor fails)

TE

Not energized

Intermittently energized
10 mins: ON / 5 mins: OFF
Output "equals to 40W"

Continuously energized
Output "equals to 40W"

*Energization
condition
TD 30°C

20
18

12
10

°C
°C

°C
°C

Notes
During winding energization, energizing noise may be heard, but this is not abnormal.

8) Short circuit operation prevention control

1) In 10 minutes after the operation start, the compressor may not stop for protection. This status is not abnormal. (The
operation duration time of the compressor varies depending on a operation status.)

2) If the operation stops with the remote controller, the operation does not continue.

9) Over current protection control

1) A detection of abnormal current with the over current protection control stops the compressor.

2) Set the abnormality detection counter to 1, and restarts the compressor after 150 seconds.

3) When the stop by over current protection control counts 8 times, error code is displayed and the compressor does
not restart.
(Remote controller error code display: HO1)

62

Item Operation flow and applicable data, etc.

8-4.

Outdoor unit
control

10) High temperature release control

1) To prevent excessive hi pressure rise, operation frequency is controlled by the TL sensor when cooling and by TWO
sensor when heating.

2) If the TL sensor when cooling or the TWO sensor when heating detects an abnormal stop zone temperature, the
compressor stops and the abnormality detection counter increments.

3) When the compressor stops in 2), the operation restarts when the temperature returns to the usual operation zone
("e" or below) after 150 seconds.

4) When the compressor stops in 2), the abnormality detection counter is cleared when the operation continues for 10
minutes. If the counter counts 10 times, error code is displayed and the compressor does not restart.

5) For details about an check code displayed, see the check code list.

Heating TC
Cooling TL

[°C]

Abnormal stop

a

Frequency normal down

b

Frequency slow down

c

Frequency hold

d

e

Frequency slow up

(up to the point instructed)

As instructed

802H-E 1102H-E, 1402H-E

Heating Cooling Heating Cooling

TC (TWO+2) TL TC (TWO+2) TL

a 61°C 63°C 62°C 63°C

b 56°C 62°C 57°C 62°C

c 54°C 60°C 55°C 60°C

d 52°C 58°C 53°C 58°C

e 48°C 54°C 49°C 54°C

63

9 Method of Defect Diagnosis

In order to diagnose the defective part of the heat pump system, first understand the symptom of the defect.
(1) Check the operation status. (It does not move, or it moves but stops, etc.)
(2) Flashing display on the display part of the hydro unit.
(3) Check the “check code” by the remote control.

Please refer to the following procedure of defect diagnosis for the identification.

No. Procedure of defect diagnosis Remark

Matters to be confirmed first 9-1-1 Check the power supply voltage

9-1-2 Check for any miswiring of the connection

9-1

Non-defective operation (program operation) Non-defective program operations for the

9-2

Outline of the determination
diagram

9-3

Diagnosis flow chart for each
error code

9-4

Operation check by PC board 9-5-1 Operation check mode The operation check mode allows to

9-5

Brief method for checking the

9-6

key components

cables between the hydro unit and the
outdoor unit

9-1-3 About the installation of the temperature

sensor

9-3-1 Procedure of defect diagnosis
9-3-2 How to determine from the check code

display on the remote controller

9-3-3 How to cancel a check code on the

remote controller

9-3-4 How to diagnose by error code

9-4-1 Hydro unit failure detection
9-4-2 Outdoor unit failure detection

9-4-3 Temperature sensor, temperature-

resistance characteristic table

9-6-1 Hydro unit
9-6-2 Outdoor unit

Check the power supply for the heat pump
hot water heater, the crossover between
the hydro unit and the outdoor unit, and the
installation of temperature sensors.

protection of the heat pump unit.

With reference to the "check code",
roughly identify the defect from the defect
diagnosis for the heat pump hot water
heater and determine the defective part
from individual symptoms.

determine good or not by checking the
operation of the 4-way valve, 2-way valve
and pulse motor valve.

How to determine the presence of any
defect particularly in functional parts.

64

9-1. Matters to be confirmed first

9-1-1. Check the power supply voltage

Check that the power supply voltage is AC230 V±23 V. If the power supply voltage is not in this range, it may not
operate normally.

9-1-2. Check for any miswiring of the connection cables between

the hydro unit and the outdoor unit

The hydro unit and the outdoor unit are connected with three connection cables. Make sure the interconnecting
connections between the hydro unit and the outdoor unit terminal blocks are connected to the correct terminal
numbers. If not connected correctly, the heat pump system does not operate. However, a miswiring would not
cause damage to the equipment.

9-1-3. About the installation of the temperature sensor

If each sensor is removed due to the replacement of the water heat exchange or inverter board, or the replacement
of the refrigeration cycle parts, make sure to put the sensor back to the position where it was before.

• Each sensor position has a marking. Make sure to put it back to the exact position.

• Make sure to install it with a sensor holder so that the temperature sensing part of the sensor and the straight
part of the copper piping are attached with each other tightly.

• If the installation of the sensor is incomplete or the installed position is wrong, it will not perform a normal control
operation and may cause a defect such as a malfunction of the equipment or an occurrence of an abnormal
sound, etc.

9-2.

Non-defective operation (program operation) … No fault
code display appears.

In order to control the heat pump unit, there are the following operations as the built-in program operations in the
microcomputer. If a claim occurs about the operation, please confirm whether it falls under any of the contents in
the following table.

If it does, please understand that the symptom is not a defect of the equipment, and it is an operation necessary
for the control and maintenance of the heat pump unit.

Table 9-2-1 Non-defective operation

No. Operation of the heat pump system Explanation

The compressor sometimes does not operate even within the

1

range of compressor “ON”.

During the hot water supply or heating operation, without
reaching the set temperature, the compressor operation

2

frequency stays at a frequency of less than the maximum Hz or
lowers down.

The “Stop” operation on the remote control will not stop the

3

circulating pump. (The same for hot water supply, heating and
cooling)

“ON” on the remote control will not operate the compressor. (It
will not operate even after the reboot delay timer elapsed)

4

When the power is turned on, it starts operation without
operating the remote control.

5

The compressor does not operate during the operation of the
compressor reboot timer (3 min). Even after the power
activation, the compressor reboot timer continues to be active.

It may be caused by the high temperature release control
(release protection control by the temperature of the water
heat exchanger) or the current release control.

In order to deal with the temperature increase in the heat
exchanger after stopping, the operation continues for 1 min
after the compressor is stopped.

When the outdoor temperature (TO sensor detection
temperature) is -20°C or lower, the heat pump will not operate
in order to protect the compressor, and the heater will operate
instead.

• The auto restart operation may be working.

• The antifreeze operation may be working.

• If the TWI, TWO or THO sensor detects a temperature
below 4°C, the operation changes from circulating pump

--->> circulating pump + heater.)

65

9-3. Outline of the determination diagram

The first determination of whether a defective part is in the hydro unit or the outdoor unit can be performed by the
following method.

9-3-1. Procedure of defect diagnosis

In the case of a defect, please apply the following procedure in order to find the defective part.

Defect

Confirm the check
code on the remote
control display

Abnormality in the outdoor unit or hot-water
tank unit

Check code

A01-A12

No

Check code

L07-L16

No

Check code

FXX

No

Yes

Yes

Yes

Defect in Hydro unit

Abnormality in the
communication or setting
system

Abnormality in the water
heat exchange or outdoor
unit sensor system

9-3-2. How to determine from the check code on the remote

control

If the defect is limited by the check code displayed on the remote control, please repair the defect based on the
table on the next page.
The check codes are separated into two groups: software and hardware errors.

Since a hardware error cannot be cancelled without a part replacement etc., please perform a repair.
If its abnormality is determined, the abnormality is noticed by indicating the check code on the remote control check

code display part while letting off a buzzer.

Check code display part

9-3-3. How to cancel a check code on the remote controller

(1) Press or button (on the operation side) to clear the check code.
(2) Press to stop a buzzer for an abnormality only.

Although the above procedure cancels the check code, the hardware error will be displayed again until the
hardware repair is completed.

ZONE1,2 HOT WATER

CL

66

9-3-4. How to diagnose by error code

Defect mode detected by the water heat exchange

O ... Possible

× .... Not possible

Check

code

Pump or flowing quantity error

1) Detected by TC sensor
TC 63°C is detected in the heating or
hot water supply heat pump operation
(except for defrosting).

2)Detected by flow switch abnormality

When no signal of the flow switch is
showing 2 min after the built-in pump
operation started.

A01

3)Detection of chattering abnormality in
the flow switch input

Chattering detection: Detects input
changes (OFF⇔ON) 4 times within
10 seconds during operation.

4)Disconnection of the flow switch
connector

When the stopped built-in pump starts
its operation, the flow switch status is
detecting "water flow".

Temperature increase error (heating)
When one of the TWI, TWO and THO

A02

sensors exceeds 70°C.

Temperature increase error (hot water
supply)

A03

When the TTW sensor exceeds 85°C.

Antifreeze operation

1)TWO>20°C condition:
2×TC+TWO < -12°C is detected.

2)TWO 20°C condition:
TC+TWO < 4°C is detected.

3)TWI 10°C is detected during

A04

A05

defrosting.

Piping antifreeze operation

Activating the heater under the condition
of TWO<4orTWI<4orTHO<4 does not
achieve TWO,TWI,THO 5°C after 30
min elapsed.

Diagnostic functional operation

Operational cause

Backup
present

Heating

Hot water

Automat

ic reset

×

O

×

O

×

Heating

O

Hot water

O

×

O

OO

×

Determination and action

1. Almost no or little water flow.

• Not enough vent air

• Dirt clogging in the water piping
system.

• The water piping is too long.

• Installation of buffer tank and
secondary pump

1. Disconnection of the flow switch

connector.

2. Defect of the flow switch.

1. Check the water inlet, water outlet

and heater outlet (TWI, TWO, THO)
sensors.

2. Defect of the backup heater (defect

automatic reset thermostat).

1. Check the hot water cylinder sensor

(TTW).

2. Check the hot water cylinder thermal

cut-out.

1. Almost no or little water flow.

• Dirt clogging in the water piping
system.

• The water piping is too long.

2. Check the heater power circuit.

• Power supply voltage, breaker,
power supply connection

3. Set the presence of the backup

heater.

4. Check the water inlet, water outlet

and heat exchange (TWI, TWO, TC)
sensors.

1. Check the heater power circuit.

• Power supply voltage, breaker,
power supply connection

2. Check the water inlet, water outlet

and heater outlet sensors (TWI,.
TWO, THO).

3. Disconnection of the backup heater.

Number of

abnormalities

for

confirmation

474

274

474

274

175

176

Heating2

Hot water2

Cooling4

178

Detailed

item

77

67

Check

code

Pressure switch operation

The pressure switch operates for 300
sec continuously during the heat pump

A07

operation.

Low pressure sensor operation error

The low pressure sensor detected 0.2
MPa or less.

A08

Overheat protection operation

When the thermostat of the backup
heater activates during the operation of

A09

the heat pump or backup heater.
When the thermostat operation is
activated while it has been stopped.

Operation of the release protection

When the TWO release counts to 10.

A11

Heating, hot water heater

The antifreeze control is detected under
the condition of TWI<20°C while

A12

TWI

>15°C, TTW>20°C is not detected

after the heater backup.

Regular communication error
between hydro unit and remote
controller

E03

When there is no regular communication
from the remote control for 3 min, or
when no remote control is equipped.

Regular communication error
between hydro unit and outdoor unit

E04

The serial signal cannot be received
from outdoor.

TC sensor error

F03

Open or short circuit in the heat
exchange temperature sensor.

TWI sensor error

F10

Open or short circuit in the water inlet
temperature sensor.

TWO sensor error

F11

Open or short circuit in the water outlet
temperature sensor.

TTW sensor error

F14

Open or short circuit in the hot water
cylinder sensor.

Diagnostic functional operation

Operational cause

Backup
present

Heating

Cooling

Hot water

Automat

ic reset

O

O

O

×

O

OO

×

×

×

×

× O

OO

OO

OO

× O

× O

Number of

Determination and action

1. Almost no or little water flow.

2. Defect of the flow switch.

3. On-load operation under the above

conditions.

4. Defect in the pressure switch.

1. Almost no or little water flow.

2. Defect of the flow switch.

3. On-load cooling or prolonged

defrosting (a lot of frost formation)
under the above conditions.

4. Defect in the low pressure sensor. 2

1. No water (heating without water) or

no water flow.

2. Defect of the flow switch.

3. Defect of the backup heater (poor

automatic reset thermostat).

1. Almost no water flow.

2. Defect of the flow switch.

3. Check the water outlet temperature

sensor (TWO).

1. Activated by a large load of heating

or hot water supply.

2. Check the heater power circuit

(backup or hot water cylinder
heater).

• Power supply voltage, breaker,
power supply connection

1. Check remote control connection.

2. Defect in the remote control.

1. Check the serial circuit.

• Miswiring of the crossover between
the water heat exchanger and the
outdoor unit

1. Check the resistance value and

connection of the heat exchange
temperature sensor (TC).

1. Check the resistance value and

connection of the water inlet
temperature sensor (TWI).

1. Check the resistance value and

connection of the water outlet
temperature sensor (TWO).

1. Check the resistance value and

connection of the hot water cylinder
sensor (TTW).

abnormalities

confirmation

for

179

8

2

1

10 82

183

1—

184

185

186

187

187

Detailed

item

80

81

68

Check

code

TFI sensor error

F17

Open or short circuit in the floor
temperature sensor.

THO sensor error

F18

Open or short circuit in the heater outlet
temperature sensor.

Detection of THO disconnection error

F19

When TWO–THO>15K is detected and
30 sec elapsed.

TFI sensor error

F20

When TWO–TFI>30K is detected and
TFI<TWI–5K is detected.

Low pressure sensor error

When PS<0.07 MPa is detected for 2

F23

sec or more.

EEROM error

F29

Inconsistency is detected once without
verify ACK after writing to EEPROM.

Extended IC error

F30

When the extended IC is abnormal.

Communication error

L07

Individual hydro units have a group line.

Communication error

The capability of the hydro unit has not

L09

been set.

Setting error

L16

When ZONE1 has not been set, while
ZONE2 has been set.

Diagnostic functional operation

Operational cause

Number of

Backup
present

Automat

ic reset

× O

× O

××

××

OO

××

××

××

××

Determination and action

1. Check the resistance value and

disconnection of the floor-inlet
temperature sensor (TFI).

1. Check the resistance value and

disconnection of the heater outlet
temperature sensor (THO).

1. Check for any disconnection of the

heater outlet temperature sensor
(THO).

1. Check any disconnection of the

floor-inlet temperature sensor (TFI).

1. Check for any disconnection (body

or connection wiring) of the low
pressure sensor.

2. Check the resistance value of the

low pressure sensor.

1. Replace the water heat exchange

control board.

1. Replace the water heat exchange

control board.

1. Replace the water heat exchange

control board.

1. Check the setting of the FC01

capability specifications.
HWS-802xx-E = 0012
HWS-1402xx-E = 0017

abnormalities

for

confirmation

187

188

188

189

189

190

190

190

190

××1. Check the body DP-SW12_2,3. 1 90

Detailed

item

69

Defect mode detected by the outdoor unit

O ... Possible

× .... Not possible

Check

code

TD sensor error

F04

Open or short circuit in the discharge
temperature sensor.

TE sensor error

F06

Open or short circuit in the heat
exchange temperature sensor.

TL sensor error

F07

Open or short circuit in the heat
exchange temperature sensor.

TO sensor error

F08

Open or short circuit in the outdoor
temperature sensor.

TS sensor error

F12

Open or short circuit in the suction
temperature sensor.

TH sensor error

F13

Open or short circuit in the heat-sink
temperature sensor.

TE, TS sensors error

Open or short circuit in the temperature

F15

sensors.

F31 EEPROM error O

Compressor breakdown

1 When the operation frequency lowers

due to the current release 40 sec or
later after the compressor activation
and it stops by underrunning the
minimum frequency.

H01

2 When the operation frequency lowers

due to the current limit control and it
stops by underrunning the minimum
frequency.

3 When an excess current is detected

0.8 sec or later after the compressor
activation.

Compressor lock

1 When the input current is more than

H02

H03

zero 20 sec or later after the
compressor activation and the
activation has not been completed.

Defect in the current detection circuit

Diagnostic functional operation

Operational cause

Backup
present

Automat

ic reset

O ×

O

O

O

O

O

O

O

O

O

Number of

Determination and action

1. Check the resistance value and

connection of the discharge sensor
(TD).

1. Check the resistance value and

×

×

×

×

×

×

connection of the heat exchange
temperature sensor (TE).

1. Check the resistance value and

connection of the heat exchange
temperature sensor (TL).

1. Check the resistance value and

connection of the outdoor
temperature sensor (TO).

1. Check the resistance value and

connection of the suction
temperature sensor (TS).

1. Check the resistance value and

connection of the heat-sink
temperature sensor (TH).

1. Check for any wrong installation of

the heat exchange temperature
sensor (TE) and the suction
temperature sensor (TS).

abnormalities

for

confirmation

1

1

1

1

1100

1100

1100

Detailed

item

85
99

85
99

86
99

86
99

× 1100

1. Check the power supply voltage

(AC230 V±23 V).

2. Over-loaded condition of the

×

×

×

refrigeration cycle.

3. Check that the service valve is fully

open.

1. Defect of compressor (lock)

– Replace the compressor.

2. Defect of compressor wiring (open

phase).

1. Replace the outdoor inverter control

board.

891

892

892

70

Check

code

Operation of case thermostat

When the case thermostat exceeds
125°C.

H04

Unset service PC board jumper

L10

Jumpers J800-J803 have not been cut.

The communication between the
outdoor PC board MUCs error

L29

No communication signal between IPDU
and CDB.

The outlet temperature error

When the discharge temperature sensor

P03

(TD) exceeds 111°C.

P04 The high pressure switch error O

The power supply voltage error

P05

When the power supply voltage is
extremely high or low.

Overheating of heat-sink error

When the heat-sink exceeds 105°C.

P07

Detection of gas leak

When the discharge temperature sensor
(TD) exceeds 106°C for consecutive 10
min.
When the suction temperature sensor

P15

(TS) exceeds 60°C for cooling or 40°C
for heating for 10 consecutive min.

The 4-way valve inversion error

When the heat exchange temperature
sensor (TE) exceeds 30°C or the suction

P19

temperature sensor (TS) exceeds 50°C
during the heat pump operation.

Diagnostic functional operation

Operational cause

Backup
present

Number of

Automat

ic reset

O

O

O

O

×

× 1.Cut J800-J803. 1 92

× 1.Replace the outdoor control board. 1 93

×

Determination and action

1. Check the refrigeration cycle (gas

leak).

2. Check the case thermostat and

connector.

3. Check that the service valve is fully

open.

4. Defect of the pulse motor valve.

5. Check for a kinked piping.

1. Check the refrigeration cycle (gas

leak).

2. Defect of the pulse motor valve.

3. Check the resistance value of the

discharge temperature sensor (TD).

abnormalities

for

confirmation

492

494

Detailed

item

× 10 94

1. Check the power supply voltage.

O

O

O

O

×

×

×

×

(AC230 V±23 V)

1. Check the thread fastening and

heat-sink grease between the
outdoor control board and the heat­sink.

2. Check the heat-sink fan duct.

3. Check the resistance value of the

heat-sink temperature sensor (TH).

1. Check the refrigeration cycle (gas

leak).

2. Check that the service valve is fully

open.

3. Defect of the pulse motor valve.

4. Check for a kinked piping.

5. Check the resistance value of the

discharge temperature sensor (TD)
and the suction temperature sensor
(TS).

1. Check the operation of the 4-way

valve unit or the coil characteristics.

2. Defect of the pulse motor valve.

3. Check the resistance value of the

heat exchange temperature sensor
(TE) and the suction temperature
sensor (TS).

494

495

495

496

71

Check

code

High pressure protection operation

When an abnormal stop occurs due to
the high pressure release control.
When the heat exchange temperature
sensor (TL) detects 63°C during the

P20

cooling operation.
When the water outlet sensor (TWO)
detects 60°C during the heating or hot
water supply operation.

Outdoor fan system error

When a DC fan rotor position detection
NG, element short circuit, loss of

P22

synchronization, or abnormal motor
current occurs.

Short circuit of the compressor driver
element error

When an abnormal short circuit of IGBT
is detected.

P26

Compressor rotor position error

The rotor position in the compressor
cannot be detected.

P29

Diagnostic functional operation

Operational cause

Backup
present

O

O

O

O

Automat

ic reset

×

×

×

×

Determination and action

1. Check that the service valve is fully

open.

2. Defect of the pulse motor valve.

3. Check the outdoor fan system

(including clogging).

4. Over-filling of refrigerant.

5. Check the resistance value of the

heat exchange temperature sensor
(TL) and the water outlet
temperature sensor (TWO).

1. Check the lock status of the motor

fan.

2. Check the connection of the fan

motor cable connector.

3. Check the power supply voltage

(AC230 V±23 V).

1. P26 abnormality occurs when

operating with the compressor
wiring disconnected … Check the
control board.

2. No abnormality occurs when

operating with the compressor
wiring disconnected … Compressor
rare short.

1. Even if the connection lead wire of

the compressor is disconnected, it
stops due to an abnormality in the
position detection … Replace the
inverter control board.

2. Check the wire wound resistor of the

compressor. Short circuit
… Replace the compressor.

Number of

abnormalities

for

confirmation

10 97

1-4 98

898

898

Detailed

item

72

Defect mode detected by the remote control

Diagnostic functional operation

Check code

Not

displaying at

all

(cannot
operate by
the remote

control)

E01

E02

E09

Operational cause

No communication between hydro
unit an remote controller

• The remote control wiring is not
connected correctly.

• The hydro unit has not been turned
on.

No communication between hydro
unit and remote controller

• Disconnection of the crossover
between the remote control and the
base unit of the indoor unit
(detected on the remote control
side).

Defect in the signal transmission
to the hydro unit.

(Detected on the remote control side)

Several remote control base units

(Detected on the remote control side)

Status of air­conditioning

Stop – Defect in the remote control power

Stop
(Automatic reset)

Stop
(Automatic reset)

Stop
(The handset
continues)

Condition

Displayed when
the abnormality
is detected.

Displayed when
the abnormality
is detected.

Displayed when
the abnormality
is detected.

Determination and action

supply

1. Check the remote controller wiring.

2. Check the remote controller.

3. Check the hydro unit power supply
wiring.

4. Check the water heat exchange
control board.

Defect in the reception of the remote
control

1. Check the remote control crossover.

2. Check the remote control.

3. Check the hydro power supply wiring.

4. Check the water heat exchanger
board.

Defect in the transmission of the remote
control

1. Check the transmitter circuit inside the
remote control.

… Replace the remote control.

1.2 Check several base units with the

remote control

… The base unit is only one, and others

are handsets.

73

9-4. Diagnosis flow chart for each error code

9-4-1. Hydro unit failure detection

[A01] Error Pump flow determination

[A01] occurs

Operation restarts

Perform

air vent

Yes

Pump rotates

Yes

Excess air noise

comes from inside

the pump

No

Chattering noise comes

from flow switch

No

Pump stops 2-3

minutes after its rotation

started

No (No pump sound)

Flow switch is

connected to board

Built-in pump is

connected to board

Flow switch is normal

No

Yes

Yes

Yes

Yes

No

No

No

Connect flow switch
connector to board

Connect pump
connector to board

Replace flow switch

Replace pump

No

TC sensor characteristic

is correct

Yes

Flow switch is normal

Yes

Water heat exchanger control board

is defective, replace it

Flow shortage

No

No

(Identify causes, and resolve)

Dirt clogging inside
water circuit

(strainer)

12 M or longer water
pipe to a branch,
or 5 or less branches

74

Replace TC sensor

Remove waste

Fit buffer tank and the
second pump

Attach or replace
flow switch

[A02] Error Temperature rise and error short circuit

Start

TWI, TWO, and THO

sensor characteristics are

correct

Yes

Flow switch is normal

Yes

Water outlet

temperature is 70

or higher

Hot water from

boiler or other circuits does

not come in

Yes

No

°C

(TWI,TWO,THO 70°C)

No

No

No

Yes

Replace TWI, TWO,
and THO sensors

Replace flow switch

Correct water circuit
(To prevent hot water of
other circuits from entering)

Backup heater is energized

(Measure heater current)

No

Replace water heat exchange control board

Yes

Failure of backup heater
(Too large heater input,
thermostat short circuit)

Replace heater unit

75

[A03] Error Temperature rise and error short circuit

Start

TTW sensor

characteristic is correct

Yes

Hot water cylinder heater

is energized

Yes

Mg-sw (RY05) for

heater operates

Yes

At normal

temperature, tank thermostat

is energized

Yes

(TTW 85°C is detected)

No

No

No

Operating noise at normal time

No

Replace TTW sensor

Replace Mg-sw

Hot water cylinder

thermostat operates

Operation
temperature 82°C

Yes

Replace water heat exchange control board

No

Replace hot water
cylinder thermostat

76

[A04] Error Freeze prevention control

When the outside temperature or inlet water temperature is low (approx. 20°C or lower) and the room load is large
(operation frequency rating), the freeze prevention control may be activated.

Start

Operation restart

Perform

air vent

Secure water
circulation amount

Dirt clogging
inside water circuit

(inside strainer, etc)

Replace flow switch

Yes

Excess air

inside pump

No

Chattering from

flow switch

No

Water heat

exchanger board DP_SW11-1

is ON

Yes

Backup

heater terminal has

230ACV ( ± 23V)

Yes

Backup

heater element

is conductive

Yes

No

No

No

Circulation
flow shortage

Power is

connect to backup

heater terminal

Yes

(Backup heater NG)

12 M or longer
water pipe to
a branch, or 5 or
less branches

No

Fit buffer tank and the
second pump

Set DP_SW11-1 to ON

Connect backup heater
power cable

Set heater breaker to ON
Check indoor wiring

Replace backup heater unit

Yes

TC, TWO, TWI

sensor characteristics

are correct

Yes

Replace water heat

exchange control board

No

(See Characteristic table on page 101)

77

Replace TC, TWO,
and TWI sensors

[A05] Error Piping freeze prevention control

Restart

TWI 4, TWO 4, or

THO 4 is detected

Circulation pump keeps

being energized or 3 minutes

passed after the start

Water heat

exchange control board

DPSW11-1 is ON

Yes

Backup heater terminal

has 230ACV ( ± 23V)

Yes

Backup heater element

is conductive

Yes

TWI, TWO, THO

sensor characteristics

are correct

No

No

Power is connect to

built-in heater terminal

Yes

No
(Backup heater NG)

No
(See characteristic table in page 101)

No

Set water heat board
DPSW11-1 to ON

Place power cable for
backup heater

Set breaker for backup heater
to ON, or Check indoor
electronic wiring

Replace backup heater
and safety valve

Replace TWI, TWO,
and THO sensors

Yes

Replace water heat

exchange control board

78

[A07] Error Pressure switch operation (Hot water supply/Heating operation)

Start

Flow switch is normal

No

Yes

Excess air

noise comes from

Yes

inside pump

No

Chattering

noise comes from

Yes

flow switch

No

Continued

operation at high outside air

temperature and at 50°C or higher

set temperature

Yes

No

Secure water
circulation amount

Circulation flow
shortage

Remove sufficiently
excess air

Waste stuck inside
water circuit

12 M or longer water
pipe to a branch,
or 5 or less branches

Replace flow switch

Remove waste

Place buffer tank and
the second pump

Lower set temperature

TWO sensor

is attached

to pipe.

Yes

Pressure switch

is normal

Yes

Replace water heat

exchange control board

No

No

Attach TWO sensor

Replace pressure switch

79

[A08] Error Lo pressure sensor lowering operation failure (Cooling/Defrosting operation)

Start

Flow switch is normal

No

Yes

Excess air

noise comes from

Yes

inside pump

No

Chattering

noise comes from

Yes

flow switch

No

Continued

operation at low outside

temperature and at 15°C or lower

set temperature

Yes

(Cooling overload operation)

No

Secure water
circulation amount

Circulation flow
shortage

Remove sufficiently
excess air

Waste stuck inside
water circuit

12 M or longer water
pipe to a branch,
or 5 or less branches

Replace flow switch

Remove waste

Place buffer tank and
the second pump

Raise set temperature

Defrosting

takes 15 mins or longer

(Frost remains)

No

Lo pressure sensor

is normal

Yes

Replace water heat

exchange control board

Yes

No

Defrost outdoor unit
where frost remains

Replace lo pressure sensor

80

[A09] Error Overheat prevention thermostat failure (Hot water supply/Heating operation)

Start

Water cycle contains water

Yes

Flow switch is normal

Yes

At normal temperature,

overheat preventive thermostat

is normal

Yes

Replace water heat exchange control board

or overheat preventive thermostat failure

*Replace water heat exchange control board or overheat preventive thermostat failure: After the control
board is replaced, if the same operation repeats, the overheat preventive thermostat is determined as
defective (does not operate at 75°C).

No

No

No

Put water into water circuit
(Recommended: 1 - 2 Bar)

Replace flow switch

Replace heater unit
exchanger air vent valve

81

[A11] Error Release protection operation

Start

Flow switch is normal

Yes

Excess air

noise comes from

inside pump

No

Chattering

noise comes from

flow switch

No

TWI sensor is

attached to pipe

Yes

No

Yes

Yes

No

Secure water
circulation amount

Circulation flow
shortage

Remove sufficiently
excess air

Waste stuck inside
water circuit

12 M or longer water
pipe to a branch,
or 5 or less branches

Replace flow switch

Remove waste

Place buffer tank and
the second pump

Attach TWI sensor

TWI and TWO

sensor characteristics

are normal

Yes

Replace water heat

exchange control board

No

Replace TWI or TWO sensor

82

[A12] Error Heating or Hot water supply heater failure

Restart

Operation starts under
10 TWI 20°C

Freeze prevention control is detected once

Heater backup operation
Heating: Booster heater
Hot water supply: Hot water cylinder heater

After 1 hour since heater operation
started, neither TWI 15
nor TTW 20

°C

is met

°C

A12 abnormality detection

exchanger board DPSW11-1,2

Water heat

is ON

Yes

Backup heater or

hot water cylinder terminal

has 230ACV ( ± 23V)

Yes

Backup heater element

is conductive

Yes

No

No

Power is connect

to backup heater or hot water

cylinder terminal

No

(Backup heater NG)

Yes

No

Set water heat board
DPSW11-1,2 to ON

Place electric wire for
backup heater
Place electric wire for
hot water cylinder

Set breaker for backup
heater to ON
Set breaker for hot water
cylinder to ON
or check indoor wiring

Replace booster heater
unit and safety valve

Hot water

cylinder heater element

is conductive

Yes

TWI, TTW sensor

characteristics are

normal

Yes

Replace water heat

exchange control board

No

(Hot water cylinder heater NG)

No

(See characteristic table in page 101)

83

Replace hot water
cylinder heater

(Refer to hot water
cylinder guide)

Replace TWI or TTW
sensor

[E04] Error

Outdoor unit operates

Yes

No

Group address

of remote controller is

correctly set

Yes

Hydro unit

Internal wiring and

connecting wire (1, 2, 3)

are correct

Yes

CN04 connector

and terminal block (1, 2, 3) wiring

are normal

Yes

When power is

on again, D502 (Amber LED)

blinks

No

No

No

No

Check item code "14"

Correct wiring and
connecting wire

Correct connector and
terminal block wiring

Check water heat
exchanger board
If defective, replace it

Check water heat exchanger

control board

If defective, replace it

Yes

Check outdoor control board

If defective, replace it

84

[F03] Error TC sensor failure

Start

TC sensor

connector (CN203) is

connected

Yes

TC sensor

resistance characteristic

is normal

Yes

Replace water heat exchange control board

[F04] Error TD sensor failure

Start

TD sensor

connector (CN603) is

connected

Yes

No

No

No

Correct TC sensor
connection

Replace TC sensor

Correct TD sensor
connection

TD sensor

resistance characteristic

is normal

Yes

Replace water heat exchange control board

[F06] Error TE sensor failure

Start

TE sensor

connector (CN601) is

connected

Yes

TE sensor

resistance characteristic

is normal

Yes

No

No

No

Replace TD sensor

Correct TE sensor
connection

Replace TE sensor

Replace water heat exchange control board

85

[F07] Error TL sensor failure

Start

TL sensor

connector (CN604) is

connected

Yes

TL sensor

resistance characteristic

is normal

Yes

Replace water heat exchange control board

[F08] Error TO sensor failure

Start

TO sensor

connector (CN602) is

connected

Yes

No

No

(See characteristic table on page 101)

No

Correct TL sensor
connection

Replace TL sensor

Correct TO sensor
connection

TO sensor

resistance characteristic

is normal

Yes

Replace water heat exchange control board

[F10] Error TWI sensor failure

Start

TWI sensor

connector (CN205) is

connected

Yes

TWI sensor

characteristic is normal

Yes

No

(See characteristic table on page 101)

No

No

(See characteristic table on page 101)

Replace TO sensor

Correct TWI sensor
connection

Replace TWI sensor

Replace water heat exchange control board

86

[F11] Error TWO sensor failure

Start

TWO sensor

connector (CN205) is

connected

Yes

TWO sensor

characteristic is normal

Yes

Replace water heat exchange control board

[F14] Error TTW sensor failure

Start

TTW sensor

connector (CN214) is

connected

Yes

No

No
(See characteristic table on page 101)

No

Correct TWO sensor
connection

Replace TWO sensor

Correct TTW sensor
connection

TTW sensor

characteristic is normal

Yes

Replace water heat exchange control board

[F17] Error TFI sensor failure

Start

TFI sensor

connector (CN213) is

connected

Yes

TFI sensor

characteristic is normal

Yes

No
(See characteristic table on page 101)

No

No
(See characteristic table on page 101)

Replace TTW sensor

Correct TFI sensor
connection

Replace TFI sensor

Replace water heat exchange control board

87

[F18] Error THO sensor failure

Start

THO sensor

connector (CN206) is

connected

Yes

THO sensor

characteristic is normal

Yes

Replace water heat exchange control board

No

No
(See characteristic table on page 101)

[F19] Error THO sensor detach failure

Start

THO sensor

is attached to pipe

Yes

No

Correct THO sensor
connection

Replace THO sensor

Attach THO sensor
to pipe

THO sensor

characteristic is normal

Yes

TWO sensor

characteristic is normal

Yes

Replace water heat exchange control board

No

(See characteristic table on page 101)

No
(See characteristic table on page 101)

Replace THO sensor

Replace TWO sensor

88

[F20] Error TFI detach failure

Start

TFI sensor

is attached to pipe

Yes

TFI sensor

characteristic is normal

Yes

TWI sensor

characteristic is normal

Yes

TWO sensor

characteristic is normal

Yes

Replace water heat exchange control board

No

No
(See characteristic table on page 101)

No
(See characteristic table on page 101)

No
(See characteristic table on page 101)

Attach TFI sensor
to pipe

Replace TFI sensor

Replace TWI sensor

Replace TWO sensor

[F23] Error Lo pressure sensor detach failure

Start

Lo pressure sensor

is detached (CN207, 212)

No

When operation

is stopped, lo pressure sensor

is normal *1

Yes

Replace water heat exchange control board

*1 How to determine: When operation is stopped

Yes

No

Attach lo pressure sensor

Replace lo pressure sensor

89

[F29] Error EEPROM failure

A failure is detected in the IC10 non-volatile memory on the water heat exchanger board during a hot water supply
unit operation. Replace the service board.

* If the unit does not have EEPROM inserted when the power is turned on, or if EEPROM data read or write is

unavailable, automatic address mode repeats. In this case, the intensive control unit displays [97 Abnormal].

(Approx. 3 mins) (Approx. 1 mins)

(Power on) Handy remote

controller displays
"Setting"

"Setting"

disappears

(Repeat)

Reboot

(reset)

[F30] Error Enhanced IC failure

Enhanced IC on water heat exchanger control board is abnormal.
Replace the water heat exchanger control board to a service board.

[L07] Error

L07: In group control, one or more "individual" for group address exist.

At the time of power on, detecting the above failure automatically activates the automatic address setting
mode.

(Check code is not output)
Note that if the above failure is detected in the automatic address setting mode, a check code may be output.

[L09] Error

Hydro unit capacity

is not set

No

Yes

Set indoor unit capacity data

Setting item code (FC) = 01
8 kW = 12
14 kW = 17

Water heat exchange control
board (MCC-1511) Check
If defective, replace it

[L16] Error

In DP_SW12-2, 3 of main unit water heat exchanger, if ZONE1 is not set and ZONE2 is set, [L16] displays
abnormality.

Set correctly DP_SW12-2, 3.

90

9-4-2. Outdoor Unit Failure Detection

Diagnosis procedure for each check code

• One check code may indicate multiple symptoms. In such a case, see the LED indication on the outdoor board
to narrow down the check details.

• The handy remote controller displays a check code only when the same failure repeatedly occurs while the LED
on the outdoor board indicates an error even if it occurs only once. This may cause indication inconsistency
between the remote controller and LED.

Outdoor board LED indication method

Dip switch setting

• Setting 1 only of SW803 to ON indicates the latest failure.
Because the error history is recorded, you can see the detail
even after the power is once turned off. (Not including outside
air temperature sensor (TO) failure)

• After check work is done or when outside air temperature
sensor (TO) failure is detected, set all the SW803 switches to
OFF.
(An abnormality now is indicated.)

Indication switching

• One or more LEDs of D800 through D804 lit yellow indicates
that a failure occurred. <Indication 1>

• With the status above, pressing the SW800 button for one
second causes the yellow LED to blink. <Indication 2>

• Pressing again SW800 for one second or longer returns to
<Indication 1>.

• The combination of <Indication 1> and <Indication 2> can
determine what kind of abnormality.

<Latest abnormality>

SW803 1 only is ON

234
1

ON

(Normal) (Abnormality occurs)(Press SW800)
D800 (yellow)
D801 (yellow)
D802 (yellow)
D803 (yellow)
D804 (yellow)
D805 (green)

(Example of outlet temperature sensor failure)

Off Light Blink

<Abnormality now>

SW803 All OFF (Initial status)

234
1

ON

<Indication 1> <Indication 2>

Check code

[H01]

Outdoor LED

indication

<Indication 1> <Indication 2>

(No specific description indicates outdoor unit parts.)

Check and Action procedure

[Compressor fails]

Power voltage is normal.
230ACV

±

23V

Yes

Wiring connection is normal.
Compressor lead (Board side, compressor
side reactor lead, power lead)

Yes

Abnormally over loaded

No

Check outdoor control board

If defective, replace it

No

No

Yes

Improve power line

Check and correct wiring
connection

Deal with or remove causes

91

Check code

[H02]

Outdoor LED

indication

<Indication 1> <Indication 2>

(No specific description indicates outdoor unit parts.)

Check and Action procedure

[Compressor lock]

[H04]

<Indication 1> <Indication 2>

Power voltage is normal.
230ACV

±

23V

Yes

Wiring connection is normal.
Compressor lead (board side,
compressor side) reactor, power lead

Yes

Compressor is normal.

Yes

Refrigerant stays inside.

Yes

Pulse motor valve operates
normally.

Yes

Check outdoor board

If defective, replace it

[Case thermostat operation]

No

No

No

No

No

Improve power line

Check and correct
wiring connection

Lock compressor and
replace it.

TE, TS sensor pulse
motor valve check
If defective, replace

[L10]

<Indication 1> <Indication 2>

CN609 connector and case

No

thermostat is normal.

Yes

If case thermostat is short circuited,

No

cooling and heating can operate.

Yes

No gas leakage.

No

Enough Refrigerant.

Yes

Service valve is fully opened.

No

Yes

Pulse motor valve is normal.

No

Yes

Check for piping collapse and break.

If defective, repair or replace it.

[Model not set] Only when service board is used

Correct connector
Replace case thermostat

Check outdoor board
If defective, replace it

Correct defective portion
Re-charge refrigerant

Open fully service valve

Correct defective portion
Replace defective parts

Cut jumper line by following the instruction
comes with the service board package

92

Check code

Outdoor LED

indication

(No specific description indicates outdoor unit parts.)

Check and Action procedure

[L29] * Any of the following abnormality may occur.

Seeing the LED on the outdoor board can determine which abnormality occurs.

Communication failure between MCUs, Heat sink temperature sensor (TH) failure, EEPROM
failure, Model not specified, Heat sink overheat failure, gas leakage detection, 4-way valve
invert failure

<Indication 1> <Indication 2>

[Communication failure between MCUs]

Check outdoor control board

If defective, replace it

<Indication 1> <Indication 2>

<Indication 1> <Indication 2>

<Indication 1> <Indication 2>

<Indication 1> <Indication 2>

[Heat sink temperature sensor (TH) failure] → See [F13] details

[EEPROM failure] → See [F31] details

[Model not set] → See [L10] details

[Heat sink overheat failure] → See [P07] details

<Indication 1> <Indication 2>

<Indication 1> <Indication 2>

[Gas leakage failure] → See [P15] details

[4-way valve invert failure] → See [P19] details

93

Check code

[P03]

Outdoor LED

indication

<Indication 1> <Indication 2>

(No specific description indicates outdoor unit parts.)

Check and Action procedure

[Abnormal outlet temperature]

No gas leakage.
Appropriate refrigerant amount.

Yes

Pulse motor valve is normal.

Yes

Abnormally over loaded

No

CN603 connector is normal.
TD sensor resistance is normal

Yes

Check outdoor control board

If defective, replace it

[P04] * Any of the following abnormality may occur.

Seeing the LED on the outside board can determine which abnormality occurs.

Power source failure (Vdc), Hi pressure protection operation, Case thermostat operation

<Indication 1> <Indication 2>

[Case thermostat operation] → See [H04] details

No

No

Yes

No

Correct defective portion
Re-charge refrigerant

Correct defective portion
Replace defective parts

Deal with or remove
causes

Correct connector
Replace sensor

[P05]

<Indication 1> <Indication 2>

<Indication 1> <Indication 2>

<Indication 1> <Indication 2>

[Power source failure (Vdc)] → See [P05] details

[Hi pressure protection operation] → See [P20] details

[Power source failure (voltage defective, open phase)]

Power voltage abnormally
drops or rise (230ACV

±

23V)

Yes

No

Check outdoor control board

If defective, replace it

Check electric work

94

Check code

[P07]

Outdoor LED

indication

<Indication 1> <Indication 2>

(No specific description indicates outdoor unit parts.)

Check and Action procedure

[Heat sink overheat failure]

[P15]

<Indication 1> <Indication 2>

The screws are loose in motor
drive element, Q200/300/400,
of outdoor control board and
rectifier, DB01/02/03.
Radiation grease was not applied
to backside of Q200, DB01,
DB02, or DB03.

No

Ventilation flue of heat sink
is cleared, Blower is not blocked
(Short circuit, etc.).

Yes

Check outdoor control board

If defective, replace it

[Gas leakage detection]

No gas leakage.
Appropriate refrigerant amount.

Yes

Pulse motor valve is normal.

Yes

Yes

No

No

No

Apply radiation grease as
needed Tighten screws
(Be sure to place back
the insulation sheet
between Q300/400 and
the heat sink.)

Remove obstacles,
Deal with short circuit

Correct defective portion
Re-charge refrigerant

Correct defective portion
Replace defective parts

Service valve is fully opened.

Yes

Piping collapse

No

Temperature sensor check
Discharge sensor CN603
Suction sensor CN600

OK

Check outdoor control board

If defective, replace it

No

Yes

NG

Open fully service valve

Repair or replace pipe

Correct connector
Replace sensor

95

Check code

r

r

[P19]

Outdoor LED

indication

<Indication 1> <Indication 2>

(No specific description indicates outdoor unit parts.)

Check and Action procedure

[4-way valve invert failure]

4-way valve operates normally.
(Check piping temperature at the

No

time of cooling/heating operation)

Yes

Temperature sensor check
TE sensor CN601
TS sensor CN600
Hydro TWO sensor
If defective, repair or replace it

4-way valve coil resistance
is 1.3 to 1.6 k .

No

Replace 4-way coil

Yes

Outdoor control board operation
check (See below)

NG

Check outdoor board
If defective, replace it

OK

4-way valve check

If defective, replace it

Outdoor control board operation check direction (Self-hold valve)

1)With the dip switch SW804 set as in the table below, pressing SW801 for approx. 1 second
can check the operation of switching to cooling cycle or to heating cycle.

• The board are energized for 10 seconds.

• Take more than a minute for the next check because the parts (coil, resistance R700)

generate large heat.(This does not apply when no coil is connected.)

2)After the check, set all the SW804 dip switches to OFF.

Switching to cooling cycle Switching to heating cycle

CN701SW804 SW801

180DCV or highe

ON

234
1

Press

CN701SW804 SW801

180DCV or highe

ON

234
1

Press

Note: Check with a tester

With an analog tester: If a tester shows 180DCV or higher, the board is good.
With digital tester: Although values shown has some range, if its maximum value is

180DCV or higher, the board is good.

96

Check code

[P20]

Outdoor LED

indication

<Indication 1> <Indication 2>

(No specific description indicates outdoor unit parts.)

Check and Action procedure

[Hi pressure protection operation]

Service valve is fully opened.

Yes

Reset the power source and perform

No

Heating season
Heating operation

a trail operation according to the season.

Cooling season
Cooling operation

Outdoor TL sensor is normal.

No

(Measure resistance)

Yes

Outdoor fan is free from crack

No

or looseness.

Yes

Outdoor fan operates normally.

No

Yes

Something prevents outdoor unit
heat exchange

Yes

- Clogged heat exchanger

- short circuit

No

Open fully service valve

Replace sensor

Check outdoor fan
If defective, replace or tighten it

Check the same item as
those for [P22] abnormality

Remove the disturbing
element

Check for refrigerant overcharged, clogged
cycle, pipe break, abnormal overload, etc.
If defective, repair defective portion

Something prevents heat
exchange of hydro unit.

- Clogged filter

Yes

- Clogged heat exchanger

- Short circuit

No

Check for refrigerant overcharged, clogged
cycle, pipe break, abnormal overload, etc.
If defective, repair defective portion

Remove the
disturbing element

97

Check code

[P22]

Outdoor LED

indication

<Indication 1> <Indication 2>

(No specific description indicates outdoor unit parts.)

Check and Action procedure

[Blower system failure]

Power voltage is normal
(230ACV

±

23V)

No

Check wiring
Request power source repair

Yes

When not energized, the fan motor
can be smoothly rotated by hand.
Fan motor coil resistance is normal.
Between red - white leads 12 -20

No

Replace fan motor

Between white - black leads 12 - 20
Between black - red leads 12 - 20

Yes

Check outdoor control board

If defective, replace it

Outdoor fan sole operation check

1)With the dip switch SW804 set as in the table below, pressing SW801 for approx. 1 second
can check the outdoor fan sole operation. Perform this check to determine which of upper or
lower fan has a problem.

• When SW801 is pressed again for 1 second or when 2 minutes has passed, the fan stops.

2)After the check, set all the SW804 dip switches to OFF.

Outdoor fan sole operation

SW804 SW801

[P26]

[P29]

<Indication 1> <Indication 2>

<Indication 1> <Indication 2>

234
1

ON

[Compressor drive element shorted out]

Press

The connection between compressor
lead and reactor is correct.
(Check with wiring diagram)

Yes

A operation without compressor lead
does not cause the same problem.

Yes

Compressor check

(rare short circuit, etc.)

If defective, replace it

[Position detection circuit failure]

Check outdoor control board

If defective, replace it

No

No

Correct wiring

Replace outdoor board

98

Check code

No code

Outdoor LED

indication

<Indication 1> <Indication 2>

(No specific description indicates outdoor unit parts.)

Check and Action procedure

[Discharge abnormality] Compressor's loss of synchronism due to rapid load change, etc.
* Although the outdoor LED indicates abnormality, the compressor restarts and no abnormality

is confirmed.

* This may occur due to the open phase of the compressor or wiring detach.

[F04]

[F06]

<Indication 1> <Indication 2>

<Indication 1> <Indication 2>

[Discharge temperature sensor (TD) failure]

TD sensor connector

No

(CN603) is connected

Yes

TD sensor resistance
characteristic is normal

Yes

No

See the

characteristic table
on page 101

Replace outdoor control board

[Heat exchanger temperature sensor (TE) failure]

TE sensor connector (CN601)

No

is connected

Yes

TE sensor resistance
characteristic is normal

Yes

No

See the
characteristic table
on page 101

Replace outdoor control board

Correct TD sensor
connection

Replace TD sensor

Correct TE sensor
connection

Replace TE sensor

[F07]

[F08]

<Indication 1> <Indication 2>

<Indication 1> <Indication 2>

[Heat exchanger temperature sensor (TL) failure]

TL sensor connector (CN604)

No

is connected

YES

TL sensor resistance
characteristic is normal

YES

No

See the
characteristic table
on page 101

Replace outdoor control board

[Outside air temperature sensor (TO) failure]

TO sensor connector (CN602)

No

is connected

Yes

TO sensor resistance
characteristic is normal

Yes

No

See the
characteristic table
on page 101

Replace outdoor control board

Correct TL sensor
connection

Replace TL sensor

Correct TO sensor
connection

Replace TO sensor

99