Kaisai MONO KHC-22RX3 Installation Manual Download

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Circulation pump operation

The circulation pump (1.7) and (10) will operate as long as the unit is on for space heating.

The circulation pump (1.7) will operate as long as the unit is on for heating domestic hot water (DHW).

Space heating

1) The unit (1) will operate to achieve the target water flow temperature set on the wired controller.

2) The bypass valve should be selected so that at all times the minimum water flow as mentioned in

9.4 Water piping

guaranteed.

Domestic water heating

1) When the domestic water heating mode is enabled (either manually by the user, or automatically through scheduling)

the target domestic hot water temperature will be achieved by a combination of the heat exchanger coil and the electrical

booster heater (when the booster heater in the tank is set to YES).

2) When the domestic hot water temperature is below the user configured set point, the 3-way valve will be activated to

heat the domestic water by means of the heat pump. If there is a huge demand for hot water or a high hot water tempera-

ture setting, the booster heater (12.3) can provide auxiliary heating.

The unit can be configured so that at low outdoor temperatures, water is exclusively heated by the booster heater. This

assures that the full capacity of the heat pump is available for space heating.
Details on domestic hot water tank configuration for low outdoor temperatures (T4DHWMIN) can be found in

10.7 Field

settings/How to set the DHW MODE

NOTE

Make sure to fit the 3-way valve correctly. For more details, refer to

9.7.6 Connection for other components/For

3-way valve SV1

CAUTION

8.3 Application 3

Space cooling and heating application with a room thermostat suitable for heating/cooling changeover when connected to the

unit. Heating is provided through floor heating loops and fan coil units. Cooling is provided through the fan coil units only.

Domestic hot water is provided through the domestic hot water tank which is connected to the unit.

FHL1

FHL2

FHLn

----

FCU1

FCU2

FCUn

----

2 3

8.1

8.2

12.1

12.2

12.3

12.1

1.5

1.4

1.2

1.3

1.7

1.6

1.1

The volume of balance tank(8) should be greater than 40L.The drain valve (6) should be installed at the lowest positon

of the system. Pump(10) should be controlled by outdoor unit and connect to corresponding port in the outdoor unit(refer

9.7.6 Connection for other components/For outside circulation pump P_o

NOTE

Pump operation and space heating and cooling

The unit will switch to either heating or cooling mode according to the setting of room thermostat. When space heating/cool-

ing is requested by the room thermostat (5), the pump will start operating and the unit (1) will switch to heating mode/cooling

mode. The unit (1) will operate to achieve the target cold/hot water leaving temperature. In the cooling mode. the motorized

3-way valve (19) will close to prevent cold water running through the floor heating loops (FHL).

The ON/OFF setting of the heating/cooling operation cannot be done on the user interface, the target outlet water temperature

should be set in the user interface.

Domestic water heating

Domestic water heating is as described in 8.2 Application 2.

Make sure to connect the thermostat wires to the correct terminals and to configure the ROOM THERMOSTAT in the

wired controller correctly (see

10.7 Field settings/ROOM THERMOSTAT

). Wiring of the room thermostat should follow

method A as described in

9.7.6 connection for other components/For room thermostat

Wiring of the 3-way valve (19) is different for a NC (normal closed) valve and a NO (normal open) valve! Make sure to

connect to the correct terminal numbers as detailed on the wiring diagram.

CAUTION

8.4 Application 4

Space heating with an auxiliary boiler (alternating operation).

Space heating application by either the unit or by an auxiliary boiler connected in the system.

The unit controlled contact (also called "permission signal for the auxiliary boiler") is determined by the outdoor temperature

(thermistor located at the outdoor unit). See

10.7 Field settings/OTHER HEATING SOURCE

Bivalent operation is possible for both space heating operation and domestic water heating operation.
If the auxiliary boiler only provides heat for space heating, the boiler must be integrated in the piping work and in the field

wiring according to the illustration for application a.
If the auxiliary boiler is also providing heat for domestic hot water, the boiler can be integrated in the piping work and in the

field wiring according to the illustration for application b. In this condition, the unit can sent ON/OFF signal to boiler in heating

mode, but the boiler control itself in DHW mode.

1.1

1.2
1.3

1.4
1.5
1.6

1.7

2
3

Assembly unit

Coding

6
7
8

8.1
8.2

FHL 1…n