Daikin EWAQ005ACV3P, Installation Manual

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EWAQ+EWYQ005~007ACV3P
Packaged air-cooled water chillers and
packaged reversible air to water heat pumps
4PW33165-1D
Installation manual
15
T
ROUBLESHOOTING
This section provides useful information for diagnosing and
correcting certain troubles which may occur in the unit.
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.
Before contacting your local Daikin dealer, read this chapter carefully,
it will save you time and money.
When a safety device was activated 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, contact your
local Daikin dealer.
General symptoms
Symptom 1: The unit is turned on (
o
LED is lit) but the unit is not
heating or cooling as expected
Symptom 2: Pump is making noise (cavitation)
Symptom 3: The water pressure relief valve opens
Symptom 4: The water pressure relief valve leaks
When carrying out an inspection on the switch box of the
unit, always make sure that the power supply to the unit is
switched off.
P
OSSIBLE CAUSES
C
ORRECTIVE ACTION
The temperature setting is not
correct. Check the controller set point.
The water flow is too low. • 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
>0.3 bar (water is cold), >> 0.3 bar
(water is hot).
• Check that the pump speed
setting is on the highest speed
(III).
• 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 11 ).
The water volume in the installation
is too low. 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 6
).
P
OSSIBLE CAUSES
C
ORRECTIVE ACTION
There is air in the system. Purge air.
Water pressure at pump inlet is too
low. • Check on the manometer that
there is sufficient water pressure.
The water pressure must be
>0.3 bar (water is cold), >>0.3 bar
(water is hot).
• 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 6
).
P
OSSIBLE CAUSES
C
ORRECTIVE ACTION
The expansion vessel is broken. Replace the expansion vessel.
The water volume in the installation
is too high. 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 6
.
P
OSSIBLE CAUSES
C
ORRECTIVE ACTION
Dirt is blocking the water pressure
relief valve outlet. Check for correct operation of the
pressure relief valve by turning the
red knob on the valve counter-
clockwise:
• If you do not hear a clacking
sound, contact your local Daikin
dealer.
• In case the water keeps running
out of the unit, close both the
water inlet and oulet shut-off
valves first and then contact your
local Daikin dealer.