Troubleshooting; General Guidelines; General Symptoms - Daikin EDLQ036BA6VJU1 Installation Manual

Backup heater vessel insulation cover
5
Check that the backup heater insulation cover is fastened tightly
around the backup heater vessel.
Domestic hot water tank pressure relief valve (field supply)
6
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.
Domestic hot water tank booster heater
7
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.
Unit switch box
8
■ 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.
In case of use of glycol
9
(Refer to Caution: "Use of glycol" on page 16)
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.
T
ROUBLESHOOTING
This section provides useful information for diagnosing and
correcting certain troubles which may occur in the unit.
This troubleshooting and related corrective actions may only be
carried out by your local Daikin technician.

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.
DANGER
When carrying out an inspection on the switch box of the
unit, always make sure that the main switch of the unit is
switched off.
When a safety device was activated, stop the unit and find out why
the safety device was activated before resetting it. Under no
circumstances safety devices may be bridged or changed to a value
other than the factory setting. If the cause of the problem cannot be
found, call your local dealer
.
If the pressure relief valve is not working correctly and is to be
replaced, always reconnect the flexible hose attached to the pressure
relief valve, to avoid water dripping out of the unit!
NOTE For problems related to the optional solar kit for
domestic water heating, refer to the troubleshooting in
the installation manual of that kit.
Installation manual
38

General symptoms

Symptom 1: The unit is turned on (y LED is lit) but the unit is not
heating or cooling as expected
P
OSSIBLE CAUSES
The temperature setting is not
correct.
The water flow is too low.
The water volume in the installation
is too low.
Symptom 2: The unit is turned on but the compressor is not starting
(space heating or domestic water heating)
P
OSSIBLE CAUSES
The unit must start up out of its
operation range (the water
temperature is too low).
The benefit kWh rate power supply
settings and electrical connections
do not match.
The benefit kWh rate signal was sent
by the electricity company.
Symptom 3: Pump is making noise (cavitation)
P
OSSIBLE CAUSES
There is air in the system.
Water pressure at pump inlet is too
low.
Symptom 4: The water pressure relief valve opens
P
OSSIBLE CAUSES
The expansion vessel is broken.
The water volume in the installation
is too high.
EDLQ036~054BA6VJU1 + EBLQ036~054BA6VJU1
C
ACTION
ORRECTIVE
Check the controller set point.
· Check that all shut off valves of the
water circuit are completely open.
· Check if the water filter needs
cleaning.
· Make sure there is no air in the
system (purge air).
· Check on the manometer that there
is sufficient water pressure. The
water pressure must be >14.5 psi
(1 bar) (water is cold).
· Check that the pump speed setting is
on the highest speed.
· Make sure that the expansion vessel
is not broken.
· Check that the resistance in the
water circuit is not too high for the
pump (refer to "Setting the pump
speed" on page 25).
Make sure that the water volume in
the installation is above the minimum
required value (refer to "Checking
the water volume and expansion
vessel pre-pressure" on page 14).
C
ACTION
ORRECTIVE
In case of low water temperature, the
system utilizes the backup heater to
reach the minimum water
temperature first (59°F (15°C)).
· Check that the backup heater power
supply is correct.
· Check that the backup heater
thermal fuse is closed.
· Check that the backup heater
thermal protector is not activated.
· Check that the backup heater
contactors are not broken.
If [D-01]=1 or 2, the wiring requires
specific installation like illustrated in
"Connection to a benefit kWh rate
power supply" on page 21. Other
correctly installed configurations are
possible, but are to be specific for
the type of benefit kWh rate power
supply type at this specific site.
Wait for the power to return.
C
ACTION
ORRECTIVE
Purge air.
· Check on the manometer that there
is sufficient water pressure. The
water pressure must be >14.5 psi
(1 bar) (water is cold).
· Check that the manometer is not
broken.
· Check that the expansion vessel is
not broken.
· Check that the setting of the pre-
pressure of the expansion vessel is
correct (refer to "Setting the pre-
pressure of the expansion vessel" on
page 15).
C
ORRECTIVE ACTION
Replace the expansion vessel.
Make sure that the water volume in
the installation is under the
maximum allowed value (refer to
"Checking the water volume and
expansion vessel pre-pressure" on
page 14).
Unit for air to water heat pump system
4PW56182-1