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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.
Each inspection has to be carried out by a licensed
technician and not by the user.
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.
The described checks must be executed at least once a year by
qualified personnel.
1
Checking for leaks
To be able to check for leaks, first remove the front decoration
panel of the indoor unit and then the front panels of the tank
module.
2
Temperature and pressure relief valve
Check for correct operation of the temperature and pressure relief
valve. Remove the front decoration panels and insulation piece.
Manually operate the temperature and pressure relief valve to
ensure free water flow through the discharge pipe. Turn knob left.
3
Pressure reducing valve with integrated non return valve and
line strainer
Depending on local water conditions, annual inspection of the
integral line strainer, pressure reducing valve cartridge and
seating may be necessary.
-
Unscrew the retaining nut of the valve. The complete
operating mechanism, including the strainer can be removed.
-
Clean the filter mesh and cartridge under running water.
-
Replace the cartridge, ensuring that the strainer is correctly
located and reassemble the unit.
4
Expansion relief valve
Check for correct operation of the expansion relief valve.
Manually operate the expansion relief valve to ensure free water
flow through discharge pipe. Turn knob left.
Depending on local water conditions, annual inspection of the
expansion relief valve cartridge and seating may be necessary.
-
Unscrew the expansion relief headwork from valve body.
-
Clean valve seat face and seating - do not scratch or damage
either seat face or seating.
-
Refit in reverse order. Do not over tighten.
Descaling
Depending on the water quality and set temperature, scale can
deposit on the heat exchanger inside the domestic hot water tank
and can restrict heat transfer. For this reason, descaling of the heat
exchanger may be required at certain intervals.
When using means for descaling, it must be ensured that
the water quality remains compliant with the requirements
of EU directive 98/83/EC.
Installation manual
10
Draining
Follow the next steps to drain the tank:
1
Switch off the power supply.
2
Turn off the cold water supply valve.
3
Open the hot water taps.
4
Open the drain valve.
T
ROUBLESHOOTING
This section provides useful information for diagnosing and
correcting certain troubles which may occur in the unit.
General guidelines
Before starting the trouble shooting procedure, carry out a thorough
visual inspection of the unit and look for obvious defects such as
loose connections or defective wiring.
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.
When a safety device was activated, stop the unit and find out why
the safety device was activated before resetting it. Under no circum-
stances 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.
General symptoms
Symptom 1: No water flow from hot taps
P
OSSIBLE CAUSES
The main water supply is off.
The strainer is blocked.
The cold water inlet pressure
reducing valve is not fitted properly.
Symptom 2: Water from hot taps is cold
P
OSSIBLE CAUSES
The thermal cut-out located in the
indoor unit has operated
The indoor unit (EKHBRD) is not
operating.
Symptom 3: Intermittent water discharge
P
OSSIBLE CAUSES
Thermal control failure (water will be
hot).
The expansion vessel is broken.
Domestic hot water tank with UK kit for air to water heat pump system
C
ORRECTIVE ACTION
Check that all shut off valves of the
water circuit are completely open.
Turn off the water supply, remove
and clean the strainer (see
"Pressure reducing valve with
integrated non return valve and line
strainer" on page 10
on how to do
this).
Check and refit as required (see
"Pressure reducing valve with
integrated non return valve and line
strainer" on page 10
on how to do
this).
C
ORRECTIVE ACTION
• Check and find the cause of tripping
and then reset button.
• Check if thermistor is correctly
installed in thermistor socket.
Procedure: remove front panel and
insulation, replace or fix the sensor.
Check the indoor unit operation.
Refer to the manual delivered with
the unit.
If any faults are suspected, contact
your local dealer.
C
ORRECTIVE ACTION
Contact your local dealer.
Replace the expansion vessel.
EKHTSU200+260AA + EKUHWHTA
4PW53247-1B
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