RKHBH/X008AA
Indoor unit for air to water heat pump system
4PW50203-1A
Installation manual
3
T
YPICAL
APPLICATION
EXAMPLES
The application examples given below are for illustration purposes
only.
Application 1
Space heating only application with a room thermostat connected to
the indoor unit.
Pump operation and space heating
When a room thermostat (T) is connected to the indoor unit, the
pump (4) will operate when there is a heating request from the room
thermostat, and the outdoor unit will start operating to achieve the
target leaving water temperature as set on the user interface.
When the room temperature is above the thermostat set point, the
outdoor unit and pump will stop operating.
Application 2
Space heating only application without room thermostat connected to
the indoor unit. The temperature in each room is controlled by a valve
on each water circuit. Domestic hot water is provided through the
domestic hot water tank which is connected to the indoor unit.
Pump operation
With no thermostat connected to the indoor unit (2), the pump (4) can
be configured to operate either as long as the indoor unit is on, or
until the required water temperature is reached.
Space heating
The outdoor unit (1) will operate to achieve the target leaving water
temperature as set on the user interface.
When the Rotex system is used in series with another heat
source (e.g. gas boiler), it shall be made sure that the
return water temperature to the heat exchanger does not
exceed 55°C. Rotex shall not be held liable for any damage
resulting from not observing this rule.
1
Outdoor unit
6
Collector (field supply)
2
Indoor unit
7
Shut-off valve
3
Heat exchanger
FHL1..3
Floor heating loop
(field supply)
4
Pump
5
Shut-off valve
T
Room thermostat
(field supply)
Make sure to connect the thermostat wires to the correct
terminals (see "Connection of the thermostat cable" on
page 13) and to configure the DIP switch toggle switches
correctly (see "Room thermostat installation configuration"
on page 15).
FHL1
FHL2
FHL3
T
5
6
4
3
2
1
7
1
Outdoor unit
10
Booster heater
2
Indoor unit
11
Heat exchanger coil
3
Heat exchanger
12
Domestic hot water tank
4
Pump
FHL1..3
Floor heating loop
(field supply)
5
Shut-off valve
6
Collector (field supply)
T1..3
Individual room
thermostat (field supply)
7
Shut-off valve
8
Motorised 3-way valve
(field supply)
M1..3
Individual motorised
valve to control loop
FHL1 (field supply)
9
By-pass valve
(field supply)
NOTE
Details on pump configuration can be found under
"Pump operation configuration" on page 16.
When circulation in each space heating loop (FHL1..3) is
controlled by remotely controlled valves (M1..3), it is
important to provide a by-pass valve (9) to avoid the flow
switch safety device from being activated.
The by-pass valve should be selected as such that at all
time the minimum water flow as mentioned under "Water
pipework" on page 9 is guaranteed.
M
FHL1
FHL2
FHL3
M1
T1
M2
T2
M3
T3
5
4
3
2
1
11
12
10
7
8
6
9
1D_IM_4PW50203-1A.book Page 3 Thursday, January 29, 2009 10:51 AM
