Panasonic LZ2 - Oil Control

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Mini VRF SYSTEM
Control Functions - Outdoor unit
1
6. Oil Control
6. Outdoor Unit CCU (command controller unit) Control
2WAY VRF SYSTEM
Control Functions
*
Operating time “XX” under Section “(4) Drain Pump Control” described on previous page is able to set
in EEPROM of the main outdoor unit.
*
The drain pump always operates when the indoor unit is thermostat ON in cooling operation.
*
The above mentioned “XX” is able to set in EEPROM of the main outdoor unit.
∆To : Cooling (Discharge air temperature) - (Preset discharge air temperature)
Heating (Preset discharge air temperature) - (Discharge air temperature)
∆To ≤ - 3.5 degrees Celsius, and this condition continues for 7 minutes
∆To < - 2.0 degrees Celsius, and this condition continues for (20 + XX) minutes
*
In the above 2 cases, the drain pump operates by the signal of indoor PCB, not by the CCU.
Once the drain pump operates, it keeps operating for 20 minutes.
EEPROM setting in main outdoor unit
CODE: 2B
Setting No.
20
30
40
60
XX
20 (minutes)
30 (minutes)
(factory preset mode)
40 (minutes)
50 50 (minutes)
60 (minutes)
*
Regarding the preset discharge air temperature that is set in the indoor unit is able to change,
see Section “5. REMOTE CONTROLLER FUNCTIONS”.
EEPROM setting in main outdoor unit
CODE: E1
Setting No.
-20
-19
-18
0
XX
-20 (minutes)
-19 (minutes)
...
...
-18 (minutes)
...
10
...
0 (minutes)
(factory preset mode)
10 (minutes)
(5) Discharge Air Temperature Control
For some indoor units, discharge air temperature is controlled from the CCU to prevent dew
condensation on duct surface in cooling operation.
The CCU monitors and adjusts ∆To of indoor unit.
The adjustment is made by compressor capacity and MOV operation in the indoor unit.
Situation in which indoor unit thermostat OFF by discharge air temperature control
2WAY VRF SYSTEM
Control Functions
7. Oil Control
(1) Self-separator Oil Recovery Control
Oil is recovered from the oil separator to the compressor through the ORVR.
2-1.
(2) System Oil Recovery Control
All indoor units MOV are opened for recovering oil from indoor side to compressor.
Start of system oil recovery control
Amount of oil in the compressor is presumed from operation condition. If presumed oil shortage, system oil
recovery control start.
This control is performed every 30 minutes - 5 hours.
For 3 minutes
Indoor units
Control time
Outdoor units
MOV
RAP valve kit
Fan
Operate for 90 seconds at 15Hz + for 90 seconds at 15 ~ 90Hz.
MOV at all indoor units operate at a fixed pulse according to the indoor unit
capacity or SH control.
All indoor units operate in Cooling mode (OFF status).
Fan rotates at the set fan speed depending on the indoor unit operation mode
or at fan speed “LL”.
In the case of cooling mode
2-2.
The system oil recovery control shall be performed as the flow mentioned below.
Normal operation → System oil recovery control → Normal operation
Simplified flow of system oil recovery control
For max 3 minutes
Indoor units
Control time
Outdoor units
MOV
RAP valve kit
Fan
Operate for 90 seconds at 15Hz + for 90 seconds at 15 ~ 90Hz.
MOV at all indoor units operate at 250 pulses.
All indoor units operate in Heating mode (ON status.)
Fan rotates at the set fan speed depending on the indoor unit operation mode
or at fan speed “LL”.
In the case of heating mode
SM830289-01_欧州向け R32 mini VRF 8,10HP SM&TRSM.indb 19SM830289-01_欧州向け R32 mini VRF 8,10HP SM&TRSM.indb 19 2021/05/07 10:10:282021/05/07 10:10:28