Installation manual
25
EKHBH/ EKSWW150-300V3/Z2
Indoor unit for air to water heat pump and sanitary warm water tank for air to water heat pump system
4PW36978-1C
M
AINTENANCE
In order to ensure optimal availability of the unit, a number of checks
and inspections on the unit and the field wiring have to be carried out
at regular intervals.
The described checks must be executed at least once a year.
1
Water pressure
Check if the water pressure is above 0.3 bar. If necessary add
water.
2
Water filter
Clean the water filter.
3
Water pressure relief valve
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 Daikin
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 Daikin dealer.
4
Pressure relief valve hose
Check that the pressure relief valve hose is positioned
appropriately to drain the water.
If the (optional) drain pan kit is installed, make sure that the
pressure relief valve hose end is positioned in the drain pan.
5
Backup heater vessel insulation cover
Check that the backup heater insulation cover is fastened tightly
around the backup heater vessel.
6
Sanitary water tank pressure relief valve (field supply)
Applies only to installations with a sanitary water tank.
Check for correct operation of the pressure relief valve on the
sanitary water tank.
7
Sanitary water tank booster heater
Applies only to installations with a sanitary water tank.
It is advisable to remove lime buildup on the booster heater to
extend its life span, especially in regions with hard water. To do
so, drain the sanitary water tank, remove the booster heater
from the sanitary water tank and immerse in a bucket (or similar)
with lime-removing product for 24 hours.
8
Indoor unit switch box
■
Carry out a thorough visual inspection of the switch box and
look for obvious defects such as loose connections or
defective wiring.
■
Check for correct operation of contactors K1M, K2M, K3M,
K5M (applications with sanitary water tank only) and K4M by
use of an ohmmeter. All contacts of these contactors must be
in open position.
T
ROUBLESHOOTING
This section provides useful information for diagnosing and
correcting certain troubles which may occur in the unit.
General guidelines
Before starting the troubleshooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
Before contacting your local Daikin dealer, read this chapter carefully,
it will save you time and money.
When a safety device was activated, stop the unit and find out why
the safety device was activated before resetting it. Under no
circumstances safety devices may be bridged or changed to a value
other than the factory setting. If the cause of the problem cannot be
found, call your local Daikin dealer
.
If the pressure relief valve is not working correctly and is to be
replaced, always reconnect the flexible hose attached to the pressure
relief valve, to avoid water dripping out of the unit!
General symptoms
Symptom 1: The unit is turned on (
y
LED is lit) but the unit is not
heating or cooling as expected
Symptom 2: The unit is turned on but the compressor is not starting
(space heating or sanitary heating)
■
Before carrying out any maintenance or repair activity,
always switch off the circuit breaker on the supply
panel, remove the fuses or open the protection
devices of the unit.
■
Make sure that before starting any maintenance or
repair activity, also the power supply to the outdoor
unit is switched off.
When carrying out an inspection on the switch box of the
unit, always make sure that the main switch of the unit is
switched off.
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The temperature setting is not
correct.
Check the controller set point.
The water flow is too low.
• 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).
• Check that the pump speed setting is
on the highest speed.
• Make sure that the expansion vessel
is not broken.
• Check that the resistance in the
water circuit is not too high for the
pump (refer to
The water volume in the installation
is too low.
Make sure that the water volume in
the installation is above the minimum
required value (refer to
the water volume and expansion
vessel pre-pressure" on page 10
P
OSSIBLE
CAUSES
C
ORRECTIVE
ACTION
The unit must start up out of its
operation range (the water
temperature is too low).
In case of low water temperature, the
system utilizes the backup heater to
reach the minimum water
temperature first (15°C).
• Check that the backup heater power
supply is correct.
• Check that the backup heater
thermal fuse is closed.
• Check that the backup heater
thermal protector is not activated.
• Check that the backup heater
contactors are not broken.