Daikin VRV IV+ Service Manual page 330

3 | Components
3.17 Refrigerant high pressure sensor
3.17.1 Checking procedures
To perform an electrical check of the refrigerant pressure sensor
Service manual
330
Prerequisite: Stop the unit operation via the central controller.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see
1 Turn ON the power of the unit.
2 Connect a pressure gauge to the high pressure service port. Read the
pressure.
INFORMATION
When the unit is operating in heating mode, the high pressure port is the gas service
port. When the unit is operating in cooling (defrost) mode, the high pressure port is
the liquid service port.
3 Using the graphic below, determine the expected sensor output voltage based
on the pressure obtained in the previous step.
5
4.5
4
3.5
3
2.5
a
2
1.5
1
0.5
0
-0.5
-0.5 0 0.5 1
a Detected pressure (MPa)
b Output voltage (V)
V (DC)
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.5 2 2.5 3 3.5 4
b
Detected pressure MPa
0.00
0.14
0.28
0.42
0.56
0.70
0.84
4
"3.15 Plate work" [ 315].
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05