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Opening the unit
I
To facilitate access to the air
purge valve, thermal cut-out,
3-way valve, thermistors, field
wiring
duct,
...,
the
decoration panel of the unit
can be removed by removing
the 2 screws at the rear and
then unhitch the panel. Both
the
drain
plates
can
removed.
I
To gain access to the indoor unit at the front side, the total switch
box can be removed from the unit.
1
To remove the front decoration
panel, remove the 2 bottom
screws and then unhitch the
panel.
2
Loosen the front screws and unhitch the total switch box.
Switch off all power supply – also outdoor unit power
supply, etc., ... – before removing the switch box
service cover.
The switch box can now be placed just before the indoor unit.
The compressor cable located at the backside of the unit can be
untied to place the switch box further away from the unit.
1
1
2
4x
1
1
3
I
Make sure to always fix the cover with the screws
when removing the switch box.
I
Parts inside the unit can be hot and burning is
possible.
I
Make sure to switch off all power supplies before
removing the switch box from the unit.
EKHBRD011~016ADV17+Y17
Indoor unit for air to water heat pump system
4P402191-1B – 2017.09
top
be
2x
4
2
5
General symptoms
Symptom 1: The unit is turned on (
2x
heating as expected
P
OSSIBLE CAUSES
The temperature setting is not
correct.
4x
The water flow is too low.
The water volume in the installation
is too low.
Capacity shortage
Symptom 2: Pump is making noise (cavitation)
P
OSSIBLE CAUSES
There is air in the system.
Water pressure at pump inlet is too
low.
Symptom 3: The water pressure relief valve opens
P
OSSIBLE CAUSES
The expansion vessel is broken.
The water volume in the installation
is too high.
Symptom 4: The water pressure relief valve leaks
P
OSSIBLE CAUSES
Dirt is blocking the water pressure
relief valve outlet.
LED is lit) but the unit is not
C
ORRECTIVE ACTION
Check the controller set point.
• Check that all shut-off valves of
the water circuit are completely
open.
• Check if the water filter needs
cleaning.
• Make sure there is no air in the
system (purge air).
• Check on the manometer that
there is sufficient water pressure.
The water pressure must be
>0.3 bar (water is cold), >>0.3 bar
(water is hot).
• Make sure that the expansion
vessel is not broken.
Make sure that the water volume in
the installation is above the minimum
required value (refer to
"Checking
the water volume and expansion
vessel pre-pressure" on page
13).
• Check if the cooling fan at the rear
of the switch box is working
properly.
• Check if the unit is not installed in
a too hot location (>30°C).
C
ORRECTIVE ACTION
Purge air.
• Check on the manometer that
there is sufficient water pressure.
The water pressure must be
>0.3 bar (water is cold), >>0.3 bar
(water is hot).
• Check that the manometer is not
broken.
• Check that the expansion vessel is
not broken.
• Check that the setting of the pre-
pressure of the expansion vessel
is correct (refer to
"Setting the pre-
pressure of the expansion vessel"
on page
14).
C
ORRECTIVE ACTION
Replace the expansion vessel.
Make sure that the water volume in
the installation is under the
maximum allowed value (refer to
"Checking the water volume and
expansion vessel pre-pressure" on
page
13).
C
ORRECTIVE ACTION
Check for correct operation of the
pressure relief valve by turning the
red knob on the valve counter
clockwise:
• If you do not hear a clacking
sound, contact your local dealer.
• In case the water keeps running
out of the unit, close both the
water inlet and outlet shut-off
valves first and then contact your
local dealer.
Installation manual
36
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