Output Of Pcb - Panasonic U-8MF2E8 Service Manual

4. Output of PCB

Item
Solenoid valve
Electrical expansion valve
Crankcase heater
* DCV1A and DCV2A are only supplied with the type of 14HP and 16HP outdoor units.
DCV1A is linked to DCV1.
DCV2A is linked to DCV2.
They can be turned ON and OFF interactively.
So, DCV1A and DCV2A are abbreviated onward.
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
System stopped
heating
mode
Other outdoor
units operating
Heat exchanger
[condenser] of
Mixed
outdoor unit
cooling/
heating
Heat exchanger
operation
[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 DCV2, SCV2 and PBV2 turn ON/OFF respectively due to the capacity control of the heat exchanger.
Discharge valve 1
Discharge valve 1A
Discharge valve 2
Discharge valve 2A
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
Refrigerant interception valve
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
heat exchanger
Condenser
Condenser
Stop
Evaporator
*1
Stop
*2
Stop
Condenser
Stop
Evaporator
Stop
1 - 13
*3
DCV1 DCV2 SCV1
ON ON OFF
ON ON/OFF OFF
OFF OFF OFF
ON ON ON
OFF OFF OFF
ON ON ON
ON ON/OFF OFF
OFF OFF OFF
ON ON/OFF ON
OFF OFF OFF
3WAY SYSTEM
Control Functions
Indication on PCB
DCV1
DCV1A
DCV2
DCV2A
SCV1
SCV2
PBV1
PBV2
SAVE
RCV
RBV
ORVR
BPV
O2
MOV1
MOV2
MOV4
CH1
CH2
*3
SCV2 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/OFF ON ON/OFF
OFF OFF OFF
1
*3