Maintenance And Service; Maintenance Introduction; Maintenance Activities; Service Precautions - Daikin EBHQ006BAV3 Installation Manual

16. M
AINTENANCE AND SERVICE

16.1. Maintenance introduction

In order to ensure optimal operation of the unit, a number of checks
and inspections should be carried out on the unit at regular intervals,
preferably yearly.
This maintenance must be carried out by your local Daikin
technician.
To execute the maintenance activities as mentioned below, it is
required to open the outdoor unit covers. See "Opening the outdoor
unit" on page 9, as well as the indoor unit front panel, See "Opening
the indoor unit" on page 9.

16.2. Maintenance activities

Service precautions

DANGER: ELECTRICAL SHOCK
See "2. General Safety precautions" on page 2.
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.
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.
Make sure you do not touch a conductive section.
Do not rinse the indoor 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.
CAUTION: 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 PIPING AND INTERNAL
PARTS
See "2. General Safety precautions" on page 2.
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.
EBHQ006+008BAV3 + EKCBX/H008BAV3
Unit for air to water heat pump system
4PW64602-1A – 09.2010
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.

Checks

The described checks must be executed at least once a year.
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. 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.
5. 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.
6. 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.
7. Outdoor unit and indoor unit switch box
- Carry out a thorough visual inspection of the switch box
(in- and outdoor unit) and look for obvious defects such as
loose connections or defective wiring.
- Check for correct operation of contactors K1M, K2M, K3M,
K5M (applications with domestic hot water tank only) and
K4M by use of an ohmmeter. All contacts of these contactors
must be in open position.
8. In case of use of glycol
(Refer to the caution at "10.5. Protecting the water circuit against
freezing" on page 20)
Document the glycol concentration and the pH-value in the
system at least once a year.
A pH-value below 8.0 indicates that a significant portion of
the inhibitor has been depleted and that more inhibitor needs
to be added.
When the pH-value is below 7.0 then oxidation of the glycol
occurred, the system should be drained and flushed
thoroughly before severe damage occurs.
Make sure that the disposal of the glycol solution is done in
accordance with relevant local laws and regulations.
Installation manual
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