Installation manual
18
0 EKCBX/H008BAV3
Unit for air to water heat pump system
4PW64602-1A – 09.2010
4
Reattach the upper part of the user interface.
First begin fitting from the clips at the
bottom.
Heater kit installation
Refer to the installation manual of the EKMBUH heater kit for more
details.
9.5.
Drain work of the outdoor unit
In case drain work on your outdoor unit is neccessary, follow the
guidelines below.
■
Two drain outlets are provided in the bottom plate of unit (drain
plug and drain hose are field supply).
■
In cold areas, do not use a drain hose with the unit. Otherwise,
drain water may freeze and block the drain. In case the use of a
drain hose is unavoidable for one reason or another, it is
recommended to install a heater tape in order to protect drain
from freezing.
■
Make sure the drain works properly.
1
Drain water holes
2
Bottom frame
10. P
IPING
CONNECTION
WORK
10.1. Checking the water circuit
The units have 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.
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.
Before continuing the installation of the unit, beware of the following
points:
■
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 unit.
■
Drain taps must be provided at all low points of the system to
permit complete drainage of the circuit. Two drain valves are
provided inside the unit.
■
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 outdoor
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 (maximum 3 bar + static pressure
of the pump).
■
The maximum waterpiping temperature is 65°C according to
safety device setting.
■
Always use materials which are compatible with the water used
in the system and with the materials used in the unit.
■
Select piping diameter in relation to required water flow and
available external static pressure (ESP) of the pump. The
recommended water piping diameter is 1".
■
The minimum required water flow for the unit operation is
12 l/min. When the water flow is lower than this minimum value,
flow error
7H
will be displayed and the operation of the unit will
be stopped.
10.2. Checking the water volume and expansion vessel
pre-pressure
The unit is equipped with an expansion vessel of 6 litre which has a
default pre-pressure of 1 bar.
To assure proper operation of the unit, the pre-pressure of the
expansion vessel might need to be adjusted and the minimum and
maximum water volume must be checked.
1
Check that the total water volume in the installation is 10 l
minimum:
2
Using the table below, determine if the expansion vessel
prepressure requires adjustment.
3
Using the table and instructions below, determine if the total
water volume in the installation is below the maximum allowed
water volume.
NOTICE
■
The user interface can only be wired from the
back. Use the user interface wire delivered with
the control box and route it through the
pre-drilled hole in the front panel of the indoor
unit.
■
When wiring, run the wiring away from the power
supply wiring in order to avoid receiving electric
noise (external noise).
■
Peel the shield for the part that
has to pass through the inside of
the user interface case (
l
).
CAUTION
Be careful not to pinch the wiring when attaching.
WARNING
The EBHQ outdoor unit and EKCB indoor unit can not be
operated without installed EKMBUH heater kit.
NOTICE
If drain holes of the outdoor unit
are covered by a mounting base
or by floor surface, raise the unit
in order to provide a free space
of more than 100 mm under the
outdoor unit.
1
≥
100
66
151
322
913
1
2
In most air conditioning applications this minimum
water volume will have a satisfying result. In critical
processes or in rooms with a high heat load though,
extra water volume might be required.
4PW64602-1A.book Page 18 Thursday, September 23, 2010 10:40 AM
