Daikin VRV IV+ Service Manual page 257

Problem solved?
Repair procedures
To remove the expansion valve coil
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
▪ Opening sequence for subcool expansion valves:
Valve closing: 8 > 7 > 6 > 5 > 4 > 3 > 2 > 1
Valve opening: 1 > 2 > 3 > 4 > 5 > 6 > 7 > 8
Phase
1 2
Ф1 ON ON
Ф2 OFF ON
Ф3 OFF OFF
Ф4 OFF OFF
7 Check if the expansion valve is open. Check with a contact thermometer (or by
touching) if refrigerant flows through the expansion valve.
Is the expansion valve open?
Yes
No
After all checking procedures listed above have been performed:
Is the problem solved?
Yes
No
Prerequisite: Stop the unit operation via the central controller.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
1 If needed, remove any parts or insulation to create more space for the
removal.
Energizing status
3 4 5
OFF OFF OFF
ON ON OFF
OFF ON ON
OFF OFF OFF
Action
Component is OK. Return to the
troubleshooting of the specific error
and continue with the next step.
Replace the Branch selector box, see
Branch selector box Installation manual.
Action
No further actions required.
Return to the troubleshooting of the
specific error and continue with the
next procedure.
"3.15 Plate
3 Components
|
6 7 8
OFF OFF ON
OFF OFF OFF
ON OFF OFF
ON ON ON
4
work" [ 315].
Service manual
257