Daikin VRV IV+ Service Manual page 210

3 | Components
Service manual
210
4 Connect a manifold to one of the service ports of the refrigerant circuit and
check the pressure (suction, discharge). Compare with normal operation
conditions of the unit.
Refrigerant pressure correct?
Yes
No
5 De-activate Heating and activate Cooling operation via the Cool/Heat
master user interface.
6 Check with a contact thermometer (or by touching) if the flow through the 4-
way valve corresponds with the flow shown in the flow diagram. (See
"6.3 Piping diagram" [
Is the flow 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.
7 With the unit operating, connect the service monitoring tool to the unit and
check in which of the following operation modes the unit is operating:
▪ Cooling mode
▪ Heating mode
▪ Simultaneous Cooling/Heating Operation
▪ Oil return operation in Cooling mode
▪ Defrost / Oil return Operation in Heating mode
▪ Oil return Operation in Simultaneous Cooling/Heating mode
8 Check with a contact thermometer (or by touching) if the flow through the 4-
way valve corresponds with the flow shown in the flow diagram of the specific
operation mode. (See
Is the flow correct?
Yes
No
Action
Replace the body of the 4‑way valve,
see "3.1.2 Repair
Leaks may be found in the refrigerant
circuit. Perform a pressure test of the
refrigerant circuit, see
procedures" [
4
401]).
Action
4‑way valve is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
Replace the body of the 4‑way valve,
see "3.1.2 Repair
4
"6.3 Piping diagram" [
Action
4‑way valve is OK. Return to the
troubleshooting of the specific error
and continue with the next procedure.
Perform the next step of this procedure.
4
procedures" [
"4.2.1 Checking
4
363].
4
procedures" [
401]).
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
211].
211].