To Drain The Domestic Hot Water Tank; About Cleaning The Water Filter In Case Of Trouble - Daikin ERGA08DAV3 Installer's Reference Manual

INFORMATION
For yearly maintenance, you do not have to remove the
water filter from the unit to clean it. But in case of trouble
with the water filter, you might have to remove it so that
you can thoroughly clean it. Then you need to do as
follows:
▪ "11.5.1 To remove the water filter" on page 78
▪ "11.5.2 To clean the water filter in case of trouble" on
page 78
▪ "11.5.3 To install the water filter" on page 78
Water pressure relief valve
Open the valve and check if it operates correctly. The water may be
very hot!
Checkpoints are:
▪ The water flow coming from the relief valve is high enough, no
blockage of the valve or in between piping is suspected.
▪ Dirty water coming out of the relief valve:
▪ open the valve until the discharged water does NOT contain dirt
anymore
▪ flush the system
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.
Pressure relief valve hose
Check whether the pressure relief valve hose is positioned
appropriately to drain the water. See
hose to the drain" on page 30.
Relief valve of the domestic hot water tank (field supply)
Open the valve.
CAUTION
Water coming out of the valve may be very hot.
▪ Check if nothing blocks the water in the valve or in between
piping. The water flow coming from the relief valve must be high
enough.
▪ Check if the water coming out of the relief valve is clean. If it
contains debris or dirt:
▪ Open the valve until the discharged water does not contain
debris or 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.
INFORMATION
It is recommended to perform this maintenance more than
once a year.
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 if contactors K1M, K2M and K3M
operate correctly. 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.
ERGA04~08DAV3(A) + EHVZ04+08S18+23DA +
EHVZ04+08S18+23DJ
Daikin Altherma 3 R F
4P495249-1B – 2019.06
"7.4.4 To connect the drain
11 Maintenance and service
Descaling
Depending on 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.
Chemical disinfection
If the 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.
We recommend to use a non-chloride based disinfectant approved
for use with water intended for human consumption.
NOTICE
When using means for descaling or chemical disinfection,
it must be ensured that the water quality remains compliant
with EU directive 98/83 EC.
11.4.1

To drain the domestic hot water tank

DANGER: RISK OF BURNING
The water in the tank can be very hot.
Prerequisite: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Close the cold water supply.
Prerequisite: Open all the hot water tapping points to allow air to
enter the system.
1 Remove the top panel, the user interface panel and the front
panel.
2 Lower the switch box.
3 Remove the stop from the access point to the tank.
4 Use a drain hose and a pump to drain the tank via the access
point.
a
a Access point to the tank
11.5 About cleaning the water filter in
case of trouble
INFORMATION
For yearly maintenance, you do not have to remove the
water filter from the unit to clean it. But in case of trouble
with the water filter, you might have to remove it so that
you can thoroughly clean it. Then you need to do as
follows:
▪ "11.5.1 To remove the water filter" on page 78
▪ "11.5.2 To clean the water filter in case of trouble" on
page 78
▪ "11.5.3 To install the water filter" on page 78
Installer reference guide
77