RKHBH/X008AA
Indoor unit for air to water heat pump system
4PW50203-1A
Installation manual
9
Mounting the indoor unit
1
Fix the wall mounting bracket to the wall using appropriate plugs
and screws.
Make sure the wall mounting bracket is completely level. When
the unit is not installed level, air might get trapped in the water
circuit resulting in malfunctioning of the unit.
Pay special attention to this when installing an RKHBX model to
prevent overflow of the drain pan.
2
Hang the indoor unit on the wall mounting bracket.
3
Fix the indoor unit at the bottom side using appropriate plugs
and screws. To do so, the unit is equipped with 2 holes at the
bottom outer edges of the frame.
Installation of the EKHBDP drain pan kit (only for
RKHBX models)
For heating/cooling models, it is necessary to install the drain pan kit
(see "Accessories" on page 2).
During cooling operation, water vapour (humidity) in the air might
condense to liquid and collect on the cold refrigerant and water pipes.
This water is collected in the drain pan, which must be connected to a
drain.
For installation instructions, refer to the instruction sheet delivered
with the drain pan kit.
Refrigerant pipework
For all guidelines, instructions and specifications regarding
refrigerant pipework between the indoor unit and the outdoor unit,
please refer to the outdoor unit installation manual.
The location of the gas pipe and liquid pipe on the indoor unit is
shown under "Main components" on page 6.
Water pipework
Checking the water circuit
The units are equipped with a water inlet and water outlet for
connection to a water circuit. This circuit must be provided by a
licensed technician and must comply with all relevant European and
national regulations.
Before continuing the installation of the unit, check the following
points:
■
The maximum water pressure is 3 bar.
■
Two shut-off valves are delivered with the unit. To facilitate
service and maintenance, install one at the water inlet and one
at the water outlet of the indoor unit. Mind position of the shut-off
valves. Orientation of the integrated drain and fill valves is
important for servicing. See figure 3.
■
Drain taps must be provided at all low points of the system to
permit complete drainage of the circuit during maintenance.
Two drain valves integrated in the shut-off valves, and a drain
valve on the expansion vessel are provided to drain the water
from the indoor unit water system.
■
Make sure to provide a proper drain for the pressure relief valve
to avoid any water coming into contact with electrical parts.
■
Air vents must be provided at all high points of the system. The
vents should be located at points which are easily accessible for
servicing. An automatic air purge is provided inside the indoor
unit. Check that this air purge valve is not tightened too much so
that automatic release of air in the water circuit remains possible.
■
Take care that the components installed in the field piping can
withstand the water pressure.
The weight of the indoor unit is approximately 50 kg. Two
persons are required to mount the unit.
3
2
1
Make sure to position the pressure relief valve hose end in
the drain pan. Failure to do so might lead to water coming
into contact with electrical parts, resulting in electrical
shocks or short-circuit of the electrical system.
Refrigerant piping
specifications
Indoor unit
Outdoor unit
Gas pipe connection
15.9 mm (5/8 inch)
15.9 mm (5/8 inch)
Liquid pipe connection
6.4 mm (1/4 inch)
6.4 mm (1/4 inch)
When connecting the refrigerant pipes, always use two
wrenches/spanners for tightening or loosening nuts!
Failure to do so can result in damaged piping connections
and leaks.
The unit is only to be used in a closed water system.
Application in an open water circuit can lead to excessive
corrosion of the water piping.
1D_IM_4PW50203-1A.book Page 9 Thursday, January 29, 2009 10:51 AM
