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M
AINTENANCE AND SERVICE
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.
This maintenance has to be carried out by your local Daikin
technician.
DANGER: ELECTRIC SHOCK
Before carrying out any maintenance or repair activity,
always switch off the circuit breaker on the supply
panel, remove the fuses (or switch off the circuit
breakers) or open 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.
Do not touch live parts for 10 minutes after the power
supply is turned off because of high voltage risk.
The heater of the compressor may operate even in
stop mode.
Please note that some sections of the electric
component box are hot.
In order to prevent damage to the PCB, first eliminate
static electricity by touching a metal part (e.g. stop
valve) with your hand. Then pull out the connector.
After measuring the residual voltage, pull out the
outdoor fan connector.
Make sure you do not touch a conductive section.
The outdoor fan may rotate due to strong backblow
wind, causing the capacitor to charge. This may result
in an electric shock.
Make sure you do not touch a conductive section.
Do not rinse the unit. This may cause electric shocks
or fire.
When service panels are removed, live parts can be
easily touched by accident.
Never leave the unit unattended during installation or
servicing when service panel is removed.
After maintenance, make sure the outdoor fan connector is
connected again. Otherwise, the unit may break down.
Play it safe!
Touch a metal part by hand (such as the stop valve) in
order to eliminate static electricity and to protect the PCB
before performing service.
DANGER
Do not touch water pipes during and immediately after
operation as the pipes may be hot. Your hand may suffer
burns. To avoid injury, give the piping time to return to
normal temperature or be sure to wear proper gloves.
E(D/B)(H/L)Q011~016BA6V3+W1
Unit for air to water heat pump system
4PW57621-1A
WARNING
Do not touch the refrigerant pipes during and
immediately after operation as the refrigerant pipes
may be hot or cold, depending on the condition of the
refrigerant flowing through the refrigerant piping,
compressor, and other refrigerant cycle parts. Your
hands may suffer burns or frostbite if you touch the
refrigerant pipes. To avoid injury, give the pipes time to
return to normal temperature or, if you must touch
them, be sure to wear proper gloves.
Do not touch the internal parts (pump, backup heater,
etc.) during and immediately after operation.
Your hands may suffer burns if you touch the internal
parts. To avoid injury, give the internal parts time to
return to normal temperature or, if you must touch
them, be sure to wear proper gloves.
The described checks must be executed at least once a year by
qualified personnel.
1
Water pressure
Check if the water pressure is above 1 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 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.
4
Pressure relief valve hose
Check that the pressure relief valve hose is positioned
appropriately to drain the water.
5
Backup heater vessel insulation cover
Check that the backup heater insulation cover is fastened tightly
around the backup heater vessel.
6
Domestic hot water tank pressure relief valve (field supply)
Applies only to installations with a domestic hot water tank.
Check for correct operation of the pressure relief valve on the
domestic hot water tank.
7
Domestic hot water tank booster heater
Applies only to installations with a domestic hot 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 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.
8
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, K3M, K5M
(applications with domestic hot water tank only) and K4M by
use of an ohm meter. All contacts of these contactors must
be in open position.
Installation manual
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