Installation manual
6
EKHWS150~300B3V3 + EKHWS200+300B3Z2
Domestic hot water tank for air to water heat pump system
4PW44499-1D
Note: only relevant field wiring is shown.
MAINTENANCE
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 Domestic hot water tank pressure relief valve (field supply)
Check for correct operation of the pressure relief valve on the
domestic hot water tank.
2 Domestic hot water tank booster heater
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 domestic hot water tank, remove the booster heater
from the domestic hot water tank and immerse in a bucket (or
similar) with lime-removing product for 24 hours.
TROUBLESHOOTING
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 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 dealer
General symptoms
Symptom 1: No water flow from hot taps
Symptom 2: Water from hot taps is cold
A4P
K6M
F2B
K3M
K7M
21
X4M
4a
OPTIONAL
X2M
2120
Q2L
3-way valve2-way valve
12114
thermostat
213 56789
10 13 19
thermal
fuse
14 15 16 17 18
SOLAR PUMP
NL
L2L1
X3M (230V)
F1B
TR1
TR1
A1P
A1P
X2M
X1M
K5M
K2M
K1M
K1M
K2M
K5M
K4M
K3M
X9A
X13A
12 4
2
3
X4M X2M
>50 mm
X4M
X3M
230 V AC
3 kW
L N
400 V AC
3 kW
L1 L2
V3
Z2
3 way
valve
L
BRN
BLU
BLK
N Y
■ 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 supply panel or on
the switch box of the unit, always make sure that the circuit
breaker of the unit is switched off.
POSSIBLE CAUSES CORRECTIVE ACTION
The main water supply is off. Check that all shut off valves of the
water circuit are completely open.
POSSIBLE CAUSES CORRECTIVE ACTION
The thermal cut-out(s) has/have
operated
• Check and reset button(s).
• Check if thermistor is correctly
installed in thermistor socket.
The indoor unit (EKHBH/X) is not
operating.
Check the indoor unit (EKHBH/X)
operation. Refer to the manual
delivered with the indoor unit.
If any faults are suspected, contact
your local dealer.
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