Components; 4-Way Valve; Main 4-Way Valve - Daikin VRV IV+ Service Manual

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3

Components

3.1

4-way valve

3.1.1

Main 4-way valve

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: Stop the unit operation (via the user interface, central
controller, operation switch, ...).
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
work" on page 118.
1 Verify that the screw is firmly fixing the coil to the valve body.
2 Check if any damage or burst is present.
Is the 4‑way valve coil firmly
fixed and not visually
damaged?
Yes
No
To perform an electrical check of the 4-way valve
Prerequisite: First perform a mechanical check of the 4-way valve,
see "Checking procedures" on page 77.
1 Unplug the 4-way valve connector from the appropriate PCB.
2 Measure the resistance of the 4-way valve coil between the
pins of the 4-way valve connector.
Result: The measured value must be 1,7 kΩ ± 10%.
Is the measured value correct? Action
Yes
No
When outdoor temperature is mild and unit can switch between
heating and cooling
INFORMATION
This procedure is ONLY possible when the outdoor
temperature is within the temperature range for both
Heating and Cooling operation mode. See the databook
on Business Portal for the temperature range of the
operation modes.
3 Connect the 4‑way valve connector to the appropriate PCB.
4 Turn ON the unit using the respective circuit breaker.
5 Activate Heating operation via the Cool/Heat master user
interface.
CAUTION
It is NOT possible to activate operation modes with another
user interface than the Cool/Heat master user interface.
6 With the 4‑way valve connector connected to the PCB,
measure the voltage on the 4‑way valve connection of the PCB.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
"3.13 Plate
Action
Perform an electrical check of the
4‑way valve, see "Checking
procedures" on page 77.
Fix or replace the 4‑way valve
coil, see "Repair procedures" on
page 78.
Continue with the next step.
Replace the 4‑way valve coil, see
"Repair procedures" on
page 78.
Result: The measured voltage MUST be 230 V AC.
7 De-activate Heating and activate Cooling operation via the
Cool/Heat master user interface.
8 Measure the voltage on the 4‑way valve connection on the
PCB.
Result: The measured voltage MUST be 0 V AC.
Are the measured voltages
correct?
Yes
No
When outdoor temperature does not allow the unit to run in
cooling or heating mode
INFORMATION
Follow this procedure when the outdoor temperature is
outside the temperature range for one of the operation
modes (Heating or Cooling). The unit CANNOT operate
in the mode for which the outdoor temperature is outside
its temperature range. See the databook on Business
Portal for the temperature range of the operation modes.
9 Connect the 4‑way valve connector to the appropriate PCB.
10 Turn ON the unit using the respective circuit breaker.
11 With the unit operating, connect the service monitoring tool to
the unit and check whether the unit is in one of the following
operation modes in which the 4-way valve is energized:
RXYQ-U units:
▪ Heating mode
RYYQ-U units:
▪ Heating mode and oil return in heating mode
▪ Defrost operation
RYMQ-U units:
▪ Heating mode and oil return in heating mode
▪ Defrost operation
Is this the case?
No
Yes
12 With the 4‑way valve connector connected to the PCB,
measure the voltage on the 4‑way valve connection of the PCB.
Result: The measured voltage MUST be 230 V AC.
Is the measured voltage
correct?
Yes
No
13 If, according to the service monitoring tool, the unit is in one of
the following operation modes in which the 4-way valve is NOT
energized:
RXYQ-U units:
▪ Oil return operation and defrost operation in heating mode
▪ Oil return operation in cooling mode
▪ Cooling mode
3 Components
Action
Perform a position check of the
4-way valve, see "Checking
procedures" on page 77.
Perform a check the main PCB,
see "3.9 Main PCB" on
page 106.
Action
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 "Checking
procedures" on page 77.
Perform a check the main PCB,
see "3.9 Main PCB" on
page 106.
Service manual
77