installation manual

The following table summarizes the required configuration and thermostat wiring at the terminal block in the switch box. Pump operation is listed in the third column. The three last columns indicate whether the following functionality is available on the user interface

(UI) or handled by the thermostat (T):

• space heating or cooling on/off ( y

)

• heating/cooling changeover (

=

)

• heating and cooling schedule timers ( pr

)

Thermostat

No thermostat

Configuration

• SS2-3 = OFF

• wiring: (non)

X2M

H C L N

1 2 3 4

• SS2-3 = ON

• wiring:

X2M

H C L N

1 2 3 4

Pump operation

determined by leaving water temperature

(a) on when space heating or cooling is on

( y

)

UI

UI

= p r

UI UI

UI UI

T — — Heating only thermostat

• SS2-3 = ON

• wiring:

X2M

H C L N

1 2 3 4 on when heating request by room thermostat th

Thermostat with heating/cooling switch

• SS2-3 = ON

• wiring:

X2M

H C L N

1 2 3 4 on when heating request or cooling request by room thermostat

T

H C th

T — th =

C =

H =

L, N =

Thermostat contact

Cooling contact

Heating contact

230 V AC

(a) The pump will stop when space heating/cooling is turned off or when the water reaches the desired water temperature as set on the user interface. With space heating/cooling turned on, the pump will then run every 5 minutes during 3 minutes to check the water temperature.

Pump operation configuration

NOTE

To set the pump speed, refer to

"Setting the pump speed" on page 16

.

Without room thermostat

When no thermostat is connected to the indoor unit, pump operation will be determined by the leaving water temperature.

To force continuous pump operation when no room thermostat is connected do the following:

set toggle switch SS2-3 to ON,

short-circuit the terminal numbers 1-2-4 on the terminal block in the switch box.

With room thermostat

When a thermostat is connected to the indoor unit, the pump will operate continuously whenever there is heating or cooling demand requested by the thermostat.

Domestic hot water tank installation configuration

■

When no domestic hot water tank is installed, toggle switch SS2-2 should be set to

OFF (default).

■

When a domestic hot water tank is installed, toggle switch SS2-2 should be set to ON.

1 2 3 4

1 2 3 4

Initial start-up at low outdoor ambient temperatures

During initial start-up and when water temperature is low, it is important that the water is heated gradually. Failure to do so may result in cracking of concrete floors due to rapid temperature change.

Please contact the responsible cast concrete building contractor for further details.

To do so, the lowest leaving water set temperature can be decreased to a value between 15°C and 25°C by adjusting the field setting

[9-01] (heating set point lower limit). Refer to

"Field settings" on page 16

.

NOTE

If leaving water temperature is set between 15°C and

25°C, heating is performed by the backup heater only.

Re-start at low outdoor ambient temperatures

When re-starting at low ambient temperature, it is important to ensure that the unit operates within its operation range as soon as possible (water temperature

≥

30°C) by reducing the load as much as possible during start-up. This procedure is applicable whenever the water temperature is out of the operation range (e.g. after long period of stand still, ...).

For example:

You can do this by switching off the fans of the fan coil units until the water temperature has increased to 30°C.

OR

For floor heating applications: start up circuit by circuit using a

(automatic) by-pass valve guaranteeing that water returning to the unit is more than 20°C.

EKHBH/XE008AA3V3

Indoor unit for air to water heat pump system

4PW48441-1B

Installation manual

15