Daikin EKHWS-B3V3 - Инструкция по эксплуатации - Страница 12

Installation manual

11

EKUHWBB + EKUHW2WB + EKHWSU150-300B3V3

Domestic hot water tank with option kit for air to water heat pump

system

4P344370-1 – 2013.03

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 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

2

Chemical disinfection
If applicable legislation requires a chemical disinfection in
specific situations,involving the domestic hot water tank, please
be aware that the domestic hot water tank is a stainless steel
cylinder containing an aluminium anode.
We therefore advise in these circumstances to use a
non-chloride based disinfectant approved for use with water
intended for human consumption.

3

Temperature and pressure relief valve
Check for correct operation of the temperature and pressure
relief valve. Manually operate the temperature and pressure
relief valve to ensure free water flow through discharge pipe.
Turn knob left.

4

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 cartridge, ensuring that strainer is correctly located
and reassemble the unit.

5

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.

6

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 contactor K3M by use of an
ohmmeter. All contacts of this contactor must be in open
position.

For the anode no maintenance or replacement is required.

If it is necessary to view internal of the cylinder, the booster heater
boss can be used. 

Troubleshooting

This section provides useful information for diagnosing and correct-
ing 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.

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 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 dealer.

General symptoms

Symptom 1: No water flow from hot taps

Symptom 2: Water from hot taps is cold

Symptom 3: Intermittent water discharge



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.



For E(K)HBH/X units only
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.

P

OSSIBLE

CAUSES

C

ORRECTIVE

ACTION

The main water supply is off.

The cold water inlet pressure 

reducing valve is not fitted properly

The strainer is blocked.

Turn off the water supply, remove 

and clean the strainer (see 

"Pressure reducing valve with 

integrated non return valve and line 

strainer" on page 11

 on how to do 

this).

The cold water inlet pressure 

reducing valve is not fitted properly

Check and refit as required (see 

"Pressure reducing valve with 

integrated non return valve and line 

strainer" on page 11

 on how to do 

this).

P

OSSIBLE

CAUSES

C

ORRECTIVE

ACTION

The thermal cut-out(s) has/have 

operated

Check and reset button(s).

The unit is not operating.

Check the unit operation. Refer to 

the manual delivered with the unit.

If any faults are suspected, contact 

your local dealer.

The solenoid 2-way valve is not 

operating correctly (only when option 

kit EKUHW2WB is installed).

Check the wiring, F2U and the 

plumbing connections to the 

solenoid 2-way valve.

Check the setting of the thermostat 

(79°C).

P

OSSIBLE

CAUSES

C

ORRECTIVE

ACTION

Thermal control failure (water will be 

hot).

Switch off power to the unit.

When discharge has stopped, check 

the thermal controls and replace if 

faulty.

Contact your local dealer.

The expansion vessel is broken.

Replace the expansion vessel.

4P344370-1.book  Page 11  Tuesday, April 2, 2013  2:32 PM