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Technical data
Installer and user reference guide
135
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
M1F
Motor (fan)
PS
Switching power supply (A2P)
Q1DI
Earth leakage circuit breaker (field supply)
R*
Resistor (A2P)
R2T
Thermistor (discharge)
R3T
Thermistor (suction accumulator)
R4T
Thermistor (subcool heat exchanger gas)
R5T
Thermistor (suction compressor)
R7T
Thermistor (liquid)
R10T
Thermistor (fin)
S1NPL
Low pressure sensor
S1NPH
High pressure sensor
S1PH
High pressure switch
S*S
Cool/heat selector switch (optional)
V1R
IGBT power module (A2P)
V2R
Diode module (A2P)
X1M
Terminal strip (power supply)
X2M
Terminal strip (transmission wiring)
X*Y
Connector
Y3E
Electronic expansion valve
Y1S
Solenoid valve (4‑way valve)
Z*C
Noise filter (ferrite core)
Z*F
Noise filter (A1P)
Notes for 8 HP:
1
When using the optional adapter, refer to the installation manual of the
optional adapter.
2
Refer to the installation or service manual on how to use BS1~BS3 push
buttons, and DS1+DS2 DIP switches.
3
Do not operate the unit by short-circuiting protection device S1PH.
4
For connection of INDOOR-OUTDOOR F1-F2 transmission wiring, and
OUTDOOR-OUTDOOR F1-F2 transmission wiring, refer to the service
manual.
Legend for wiring diagram 8 HP:
A1P
Printed circuit board (main)
A2P
Printed circuit board (noise filter)
A3P
Printed circuit board (inverter)
A4P
Printed circuit board (cool/heat selector)
BS*
Push button (mode, set, return) (A1P)