5
6
7
8
9
Backup heater vessel insulation cover
General symptoms
Check that the backup heater insulation cover is fastened tightly
around the backup heater vessel.
Domestic hot water tank pressure relief valve (field supply)
Symptom 1: The unit is turned on (y LED is lit) but the unit is not
heating or cooling as expected
Applies only to installations with a domestic hot water tank.
Check for correct operation of the pressure relief valve on the
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domestic hot water tank.
The temperature setting is not
correct.
Check the controller set point.
Domestic hot water tank booster heater
The water flow is too low.
· Check that all shut off valves of the
Applies only to installations with a domestic hot water tank.
water circuit are completely open.
· Check if the water filter needs
It is advisable to remove lime buildup on the booster heater to
cleaning.
extend its life span, especially in regions with hard water. To do
so, drain the domestic hot water tank, remove the booster heater
· Make sure there is no air in the
system (purge air).
· Check on the manometer that there
from the domestic hot water tank and immerse in a bucket (or
is sufficient water pressure. The
similar) with lime-removing product for 24 hours.
water pressure must be >14.5 psi
(1 bar) (water is cold).
Unit switch box
· Check that the pump speed setting is
on the highest speed.
■
Carry out a thorough visual inspection of the switch box and
look for obvious defects such as loose connections or
defective wiring.
· Make sure that the expansion vessel
is not broken.
· Check that the resistance in the
water circuit is not too high for the
■
Check for correct operation of contactors K1M, K3M, K5M
pump (refer to "Setting the pump
speed" on page 25).
(applications with domestic hot water tank only) and K4M by
use of an ohm meter. All contacts of these contactors must
The water volume in the installation
is too low.
Make sure that the water volume in
the installation is above the minimum
be in open position.
required value (refer to "Checking
In case of use of glycol
the water volume and expansion
vessel pre-pressure" on page 14).
(Refer to Caution: "Use of glycol" on page 16)
Symptom 2: The unit is turned on but the compressor is not starting
Document the glycol concentration and the pH-value in the
(space heating or domestic water heating)
system at least once a year.
■
A pH-
value below 8.0 indicates that a significant portion of
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the inhibitor has been depleted and that more inhibitor needs
to be added.
The unit must start up out of its
operation range (the water
temperature is too low).
In case of low water temperature, the
system utilizes the backup heater to
reach the minimum water
■
When the pH-value is below 7.0 then oxidation of the glycol
occurred, the system should be drained and flushed
temperature first (59°F (15°C)).
· Check that the backup heater power
supply is correct.
thoroughly before severe damage occurs.
· Check that the backup heater
Make sure that the disposal of the glycol solution is done in
thermal fuse is closed.
· Check that the backup heater
accordance with relevant local laws and regulations.
thermal protector is not activated.
· Check that the backup heater
contactors are not broken.
T
ROUBLESHOOTING
The benefit kWh rate power supply
settings and electrical connections
do not match.
If [D-01]=1 or 2, the wiring requires
specific installation like illustrated in
"Connection to a benefit kWh rate
This section provides useful information for diagnosing and
power supply" on page 21. Other
correctly installed configurations are
correcting certain troubles which may occur in the unit.
possible, but are to be specific for
the type of benefit kWh rate power
This troubleshooting and related corrective actions may only be
supply type at this specific site.
carried out by your local Daikin technician.
The benefit kWh rate signal was sent
Wait for the power to return.
by the electricity company.
General guidelines
Symptom 3: Pump is making noise (cavitation)
Before starting the troubleshooting procedure, carry out a thorough
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visual inspection of the unit and look for obvious defects such as
There is air in the system.
Purge air.
loose connections or defective wiring.
Water pressure at pump inlet is too
· Check on the manometer that there
low.
is sufficient water pressure. The
DANGER
water pressure must be >14.5 psi
(1 bar) (water is cold).
When carrying out an inspection on the switch box of the
· Check that the manometer is not
unit, always make sure that the main switch of the unit is
switched off.
broken.
· Check that the expansion vessel is
not broken.
When a safety device was activated, stop the unit and find out why
· Check that the setting of the pre-
pressure of the expansion vessel is
the safety device was activated before resetting it. Under no
correct (refer to "Setting the pre-
circumstances safety devices may be bridged or changed to a value
other than the factory setting. If the cause of the problem cannot be
pressure of the expansion vessel" on
page 15).
found, call your local dealer
.
Symptom 4: The water pressure relief valve opens
If the pressure relief valve is not working correctly and is to be
replaced, always reconnect the flexible hose attached to the pressure
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relief valve, to avoid water dripping out of the unit!
The expansion vessel is broken.
Replace the expansion vessel.
The water volume in the installation
Make sure that the water volume in
NOTE
For problems related to the optional solar kit for
domestic water heating, refer to the troubleshooting in
the installation manual of that kit.
is too high.
the installation is under the
maximum allowed value (refer to
"Checking the water volume and
expansion vessel pre-pressure" on
page 14).
Installation manual
EDLQ036~054B EBLQ036~054BA6VJU1
38
Unit for air to water heat pump system
4PW56182-1
