Overview: Maintenance; Maintenance Safety Precautions; Opening The Indoor Unit; Checklist For Yearly Maintenance For Indoor Unit - Daikin Altherma Installer's Reference Manual

11.1

Overview: Maintenance

11.2

Maintenance safety precautions

DANGER: RISK OF ELECTROCUTION
DANGER: RISK OF BURNING
NOTICE: Risk of electrostatic discharge
Before performing any maintenance or service work, touch
a metal part of the unit in order to eliminate static electricity
and to protect the PCB.
11.2.1

Opening the indoor unit

See "7.1.3 To open the switch box cover of the indoor unit" on
page 28.
11.3 Checklist for yearly maintenance for
indoor unit
Check the following at least once a year:
▪ Water pressure
▪ Water filter
▪ Water pressure relief valve
▪ Pressure relief valve of the domestic hot water tank
▪ Switch box
▪ Booster heater of the domestic hot water tank
Water pressure
Check whether the water pressure is above 1 bar. If it is lower, add
water.
Water filter
Clean the water filter.
NOTICE
Handle the water filter with care. Do NOT use excessive
force when you reinsert the water filter so as NOT to
damage the water filter mesh.
1 3
2
4
5
Water pressure relief valve
Open the valve and check the correct operation. Water may be very
hot!
Checkpoints are:
▪ Water flow coming from the relief valve is high enough, no
blockage of the valve or in between piping is suspected.
ERLQ004~008CAV3 + EHBH/X04+08CA
Daikin Altherma - Low Temperature Split
4P313774-1C – 2012.11
▪ Water coming out from the relief valve and contains debris or dirt:
▪ open the valve untill the discharged water does not contain dirt
anymore
▪ flush the system and install an additional water filter (a
magnectic cyclone filter is preferably).
To make sure this water originates from the tank, check after a tank
heat up cycle.
It is recommended to do this maintenance more frequently.
Relief valve of the domestic hot water tank (field supply)
Open the valve and check the correct operation. Water may be very
hot!
Checkpoints are:
▪ Water flow coming from the relief valve is high enough, no
blockage of the valve or in between piping is suspected.
▪ Water coming out from the relief valve and contains debris or dirt:
▪ open the valve untill the discharged water does not contain dirt
anymore
▪ flush and clean the complete tank including the piping between
the relief valve and cold water inlet.
To make sure this water originates from the tank, check after a tank
heat up cycle.
It is recommended to do this maintenance more frequently.
Switch box
▪ Carry out a thorough visual inspection of the switch box and look
for obvious defects such as loose connections or defective wiring.
▪ Using an ohmmeter, check for correct operation of contactors
K1M, K2M, K3M and K5M (depending on your installation). All
contacts of these contactors must be in open position when the
power is turned OFF.
WARNING
If the internal wiring is damaged, it has to be replaced by
the manufacturer, its service agent or similarly qualified
persons.
Booster heater of the domestic hot water tank
INFORMATION
Only for wall-mounted units equipped with a domestic hot
water tank with a built-in electrical booster heater
(EKHW*).
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.
12

Troubleshooting

12.1

Overview: Troubleshooting

12.2

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.
12 Troubleshooting
Installer reference guide
71