Refrigerant Low Pressure Sensor; Checking Procedures - Daikin VRV IV+ Service Manual

3 Components
a
a Refrigerant pressure sensor
b Refrigerant pressure sensor pipe
4 Remove the refrigerant pressure sensor.
5 Supply nitrogen to the refrigerant circuit. The nitrogen pressure
MUST NOT exceed 0.02 MPa.
6 Heat the end of the refrigerant pressure sensor pipe using an
oxygen acetylene torch and remove the refrigerant pressure
sensor pipe end.
7 Stop the nitrogen supply when the piping has cooled down.
8 To install the refrigerant pressure sensor, see
procedures" on page 125.
To install the refrigerant pressure sensor
1 Install the refrigerant pressure sensor in the correct location.
2 Supply nitrogen to the refrigerant circuit. The nitrogen pressure
MUST NOT exceed 0.02 MPa.
3 Wrap a wet rag around the refrigerant pressure sensor and
solder the refrigerant pressure sensor pipe to the refrigerant
pressure sensor.
a
a Refrigerant pressure sensor
b Refrigerant pressure sensor pipe
CAUTION
Overheating the pressure sensor will damage or destroy it.
4 After soldering is done, stop the nitrogen supply after the
component has cooled‑down.
5 Route the refrigerant pressure sensor harness towards the
appropriate PCB.
6 Connect the refrigerant pressure sensor connector to the
appropriate PCB.
7 Fix the refrigerant pressure sensor harness using new tie
straps.
8 Add refrigerant to the refrigerant circuit, see
procedures" on page 136.
Service manual
126
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
b
"3.15.2 Repair
b
"4.2.2 Repair
Is the problem solved?
Yes
No
3.16

Refrigerant low pressure sensor

3.16.1

Checking procedures

To perform an electrical check of the refrigerant
pressure sensor
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 Turn ON the power of the unit.
2 Connect a pressure gauge to the low pressure service port.
Read the pressure.
INFORMATION
When the unit is operating in heating mode, the low
pressure port is the liquid service port. When the unit is
operating in cooling (defrost) mode, the low pressure port
is the gas service port.
3 Using the graphic below, determine the expected sensor output
voltage based on the pressure measured in the previous step.
20.4
15.3
10.2
a
5.1
0
-5.1
-0.5 0 0.5 1
a Detected pressure (kg/cm²)
b Output voltage (V)
V (DC)
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
Action
No further actions required.
Return to the troubleshooting of
the specific error and continue
with the next procedure.
"3.13 Plate
1.5 2 2.5 3 3.5 4
b
2
Detected pressure kg/cm
0.00
0.63
1.21
1.79
2.38
2.96
3.54
4.12
4.70
5.28
5.86
6.44
7.03
7.61
8.12
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07