Output Of Pcb - Panasonic U-72MF2U9 Service Manual

4. Output of PCB

Item
Solenoid valve
Expansion valve
Crankcase heater
4-1. [DCV, SCV, PBV]
Turn DCV, SCV and PBV to ON/OFF.
Change the outdoor unit heat exchanger mode and/or control the heat exchanger capacity.
See the basic operation listed below.
Normal
All
Low ambient
cooling
temperature
mode
All
heating System stopped
mode
Other outdoor
units operating
Heat exchanger
[condenser] of
Mixed
outdoor unit
cooling/
heating
Heat exchanger
mode
[evaporator] of
outdoor unit
*1 The system which is stopped in heating mode shows the status of all outdoor units stopped.
*2 When other outdoor units are operating in heating mode, the outdoor unit in stop mode is holding the pulse
at 0 pulses of MOV1 and MOV2 in a situation in which the heat exchanger is evaporator.
*3 DCV1, SCV1 and PBV1 turn ON/OFF respectively due to the capacity control of the heat exchanger.
Discharge valve 1
Discharge valve 2
Suction valve 1
Suction valve 2
Heat exchanger pressure balance valve 1
Heat exchanger pressure balance valve 2
Save valve
Refrigerant control valve
Refrigerant balance valve
Oil recovery valve
By-pass valve
Accumulator valve
O valve
2
MOV for heat exchanger 1
MOV for heat exchanger 2
SC circuit electronic control valve
Crankcase heater control 1
Crankcase heater control 2
Status of
DCV1
heat exchanger
Condenser ON
Condenser ON/OFF
Stop OFF
Evaporator ON
*1
Stop OFF
*2
Stop ON
Condenser ON/OFF
Stop OFF
Evaporator ON/OFF
Stop OFF
1 - 13
*3 *3
DCV2 SCV1 SCV2
ON OFF
ON OFF
OFF OFF
ON ON
OFF OFF
ON ON
ON OFF
OFF OFF
ON ON/OFF
OFF OFF
3WAY VRF SYSTEM
Control Functions
Indication on PCB
DCV1
DCV2
SCV1
SCV2
PBV1
PBV2
SAVE
RCV
RBV
ORVR
BPV
ACV
O
2
MOV1
MOV2
MOV4
CH1
CH2
*3
PBV1 PBV2
OFF OFF OFF
OFF OFF OFF
OFF OFF OFF
ON ON ON
OFF OFF OFF
ON ON ON
OFF OFF OFF
OFF OFF OFF
ON ON/OFF ON
OFF OFF OFF
1
2
3
4
5
6
7
8
9