Panasonic U-14ME2E8 User Manual

2WAY SYSTEM
Control Functions - Outdoor unit
1 - 12
1
4. Special Control
4. Special Control
2WAY VRF SYSTEM
Control Functions
Items Remarks Indication on PCB
This valve turns OFF at cooling mode, and turns ON at heating mode.
When the outdoor unit stops, the 4-way valve maintains in the same state as before.
Regarding the operation in defrost mode, see the section "9. Defrost Control".
Solenoid valve
Motor Operated Valve
Crankcase heater
4-way valve
Save valve
Oil recovery valve
By-pass valve
Accumulator valve
O
2 valve
MOV for heat exchanger 1
MOV for heat exchanger 2
MOV for super cooling
Crankcase heater for inverter compressor 1
Crankcase heater for inverter compressor 2
20S
SAVE
ORVR
BPV
ACV
O
2
MOV1
MOV2
MOV4
CH1
CH2
(1) 4-way Valve [20S]
This valve turns ON for 5 seconds before the inverter compressor starts. After the inverter compressor starts, the
valve is ON for 10 seconds. After that, it turns OFF.
SAVE valve
5 seconds 10 seconds
Inverter compressor starts
Compressor
(2) SAVE Valve [SAVE]
Valve turns ON
α
β
3.00
MPa
2.90
3.42
Renewal
setting
Standard
setting
3.32
Valve turns OFF
This valve turns ON for 30 seconds after the outdoor unit stops. After that, it turns OFF.
This valve turns ON when the high pressure sensor detects α to prevent
abnormal pressure shown in the table at right.
This valve turns OFF when the high pressure goes down below β shown
in the table at right.
This valve turns ON when the high pressure switch is activated.
This valve stays ON for 10 seconds after the high pressure switch returns in normal.
After that, it turns OFF.
This valve might turn ON when the system capacity is excessive although the inverter compressor operates at
minimum frequency.
This valve turns ON while the discharge temperature of the compressor is low.
This valve turns ON during the operation of 4-way valve control.
2WAY VRF SYSTEM
Control Functions
4. Special Control
(3) Oil Recovery Valve [ORVR]
The purpose of this valve is to recover oil from the oil separator of its own outdoor unit or balance tube to the
compressor.
This valve turns ON when the oil level of the compressor is “0” or “1”.
This valve turns ON for 2 minutes after the compressor starts.
This valve is always OFF when outdoor unit is stopped.
* For oil level of compressor, see the section “7. Oil Control”.
This valve turns ON when recovering refrigerant from the stopped outdoor unit.
(4) By-pass Valve [BPV]
This valve is for pushing the oil in the balance piping into other outdoor units.
When the compressor oil level of its own outdoor unit is in the “2” or “1”, this valve turns ON when the oil level “0”
is detected in other outdoor units.
When the compressor itself is stopped with a full of refrigerant, this valve turns ON.
Then the refrigerant is supplied to the other operating outdoor units.
* This valve turns ON for 10 seconds and turns OFF for 20 seconds.
This operation is repeated while oil is supplied to others.
* For more information on oil level of compressor, see the section “7. Oil Control”.
(5) Accumulator Valve [ACV]
The purpose of this valve is to recover oil and refrigerant from the accumulator
to the compressor.
This valve turns OFF when the compressor operation just started.
This valve turns ON when the compressor is warmed up.
This valve turns ON while the oil recovery among the systems and defrost
control are in progress.
This valve turns ON while the MOV4 is operating.
(6) O2 Valve [O2] *O
2
valve is the local supply parts.
ACV
Accumulator
This valve works when the outdoor unit receives signal of the refrigerant leakage from the indoor unit.
The indoor unit that transmits the signal of the refrigerant leakage gives “P14”alarm.
To activate this function, it is necessary to set it to EEPROM on the main outdoor PCB and indoor PCB.
EEPROM setting in main outdoor unit
CODE: C1
Setting No.
Setting No.
0
0
1
1
2
This function invalid (at factory shipment)
This valve is turned OFF when the system is normal.
This valve is turnsd ON when the outdoor unit receives signal from the indoor unit
This valve is turned ON when the system is normal.
This valve is turnsd OFF when the outdoor unit receives signal from the indoor unit
EEPROM setting in indoor unit
CODE: 0B
Function of EXCT plug short-circuit
Indoor unit does thermostat OFF
(at factory shipment)
Indoor unit gives “P14”alarm and transmits the refrigerant leakage signal.
SM830253-00_欧州2way7_SM-TRSM.indb 12 16/08/26 19:23:15

Panasonic U-14ME2E8 Specifications

General

Brand	Panasonic
Model	U-14ME2E8
Category	Air Conditioner
Language	English