4-Way Valve; Checking Procedures - Daikin Altherma EBLQ011CAV3 Service Manual

2 Components
a
a Screw
5 Install the 3‑way valve knob on the 3‑way valve motor.
a
b
a 3-way valve knob
b 3-way valve motor
6 Route the 3‑way valve motor harness through the grommet in
the switch box.
7 Connect the 3‑way valve motor connector to the hydro PCB.
8 Install new tie straps to fix the 3‑way valve harness.
Is the problem solved?
Yes
No
2.2

4-way valve

2.2.1

Checking procedures

INFORMATION
It is recommended to perform the checks in the listed
order.
To perform a mechanical check of the 4-way valve
Prerequisite: Turn OFF the unit via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Service manual
38
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
Prerequisite: Remove the required plate work, see
work" on page 77.
1 Disconnect the 4‑way valve connector from the main PCB.
2 Turn ON the power of the unit.
INFORMATION
Default position of the 4‑way valve is Heating mode.
3 Activate Heating operation via the user interface.
Water temperature after plate
type heat exchanger of the
indoor unit:
Drops
Rises
Does NOT rise/drop
4 Connect a manifold to one of the service ports of the refrigerant
circuit and check the pressure.
Refrigerant pressure
measured?
Yes
No
CAUTION
To prevent damage due to liquid entering the compressor,
the steps below MUST ONLY be executed once.
CAUTION
Make sure you have a pressure difference of at least 6 bar
between the high and low pressure when performing this
test.
5 Place a round permanent magnet on the core of the solenoid
valve and listen to the 4‑way valve.
Does the 4‑way valve switch?
Yes
No
To perform an electrical check of the 4-way valve
1 First perform a mechanical check of the 4‑way valve, see
"2.2.1 Checking procedures" on
2 Activate Cooling operation via the user interface.
3 Measure the voltage on the 4‑way valve connector pins 1-3.
The measured voltage MUST be 220~240 V AC during
switching and 12 V DC after switching of the 4‑way valve.
Is the measured voltage
correct?
Yes
EBLQ+EDLQ011~016CAV3+W1 + EBLQ+EDLQ011~016CA3V3+W1
+ EK(2)CB07CAV3 + EKMBUHCA3V3+9W1
"2.19 Plate
Action
4‑way valve is stuck in cooling
position. Replace the 4‑way
valve body, see "2.2.2 Repair
procedures" on page 39.
Skip the next step of this
procedure.
Perform the next step of this
procedure.
Action
Perform a position check of the
4‑way valve, see "2.2.1 Checking
procedures" on page 38.
Leaks may be found in the
refrigerant circuit. Perform a
pressure test of the refrigerant
circuit, see "3.2.1 Checking
procedures" on page 92.
Action
Perform an electrical check of the
4‑way valve, see "2.2.1 Checking
procedures" on page 38.
Replace the 4‑way valve body,
see "2.2.2 Repair procedures" on
page 39.
page 38.
Action
Skip the next step of this
procedure.
Daikin Altherma – Monobloc
ESIE18-04 – 2019.02