Daikin Altherma EAVX-D9WG, Installer'S Reference Manual

Page: 78 / 104

12 Troubleshooting
Installer reference guide
78
EPGA11~ EAVH/9W
Daikin Altherma – Low temperature split
4P556070-1 – 2019.02
12.3.6 Symptom: The pressure relief valve opens
Possible causes Corrective action
The expansion vessel is broken Replace the expansion vessel.
The valve (if equipped) of the
water circuit towards the
expansion vessel is closed. Open the valve.
The water volume in the
installation is too high Make sure that the water volume
in the installation is below the
maximum allowed value (see
"6.3.3 To check the water volume
and flow rate" on page 24
and
"6.3.4 Changing the pre-pressure
of the expansion vessel" on
page 25
).
The water circuit head is too high The water circuit head is the
difference in height between the
indoor unit and the highest point
of the water circuit. If the indoor
unit is located at the highest
point of the installation, the
installation height is considered
0 m. The maximum water circuit
head is 10 m.
Check the installation
requirements.
12.3.7 Symptom: The water pressure relief valve
leaks
Possible causes Corrective action
Dirt is blocking the water
pressure relief valve outlet Check whether the pressure
relief valve works correctly by
turning the red knob on the valve
counterclockwise:
▪ If you do NOT hear a clacking
sound, contact your dealer.
▪ If the water keeps running out
of the unit, close both the
water inlet and outlet shut-off
valves first and then contact
your dealer.
12.3.8 Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes Corrective action
The backup heater operation is
not activated Check and make sure that:
▪ The backup heater operation
mode is enabled. Go to:
▪ [9.3.8]: Installer settings >
Backup heater > Operation
[4‑00]
▪ The backup heater overcurrent
fuse has not been turned off. If
it has, check the fuse and turn
it back on.
▪ The thermal protector of the
backup heater has not been
activated. If it has, check the
following, and then press the
reset button in the switch box:
▪ The water pressure
▪ Whether there is air in the
system
▪ The air purge operation
The backup heater equilibrium
temperature has not been
configured correctly Increase the "equilibrium
temperature" to activate the
backup heater operation at a
higher outdoor temperature. Go
to:
▪ [9.3.7]: Installer settings >
Backup heater > Equilibrium
temperature [5‑01]
There is air in the system. Purge air manually or
automatically. See the air purge
function in the chapter
"9 Commissioning" on page 70 .
Too much heat pump capacity is
used for heating domestic hot
water Check and make sure that the
"space heating priority" settings
have been configured
appropriately:
▪ Make sure that the "space
heating priority status" has
been enabled. Go to [9.6.1]:
Installer settings > Balancing >
Space heating priority [5‑02]
▪ Increase the "space heating
priority temperature" to
activate backup heater
operation at a higher outdoor
temperature. Go to [9.6.3]:
Installer settings > Balancing >
Offset BSH setpoint [5‑03]
12.3.9 Symptom: The pressure at the tapping
point is temporarily unusually high
Possible causes Corrective action
Failing or blocked pressure relief
valve. ▪ Flush and clean the complete
tank including the piping
between pressure relief valve
and the cold water inlet.
▪ Replace the pressure relief
valve.