Panasonic EAIRC-MJ Series Service Manual

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Mini VRF SYSTEM
Control Functions
3. Special Controls
•
In addition to ordinary heating and cooling operation, this system also includes the following 4 types of special
controls for control of the system as a whole:
3-1. Oil discharge prevention device control
3-1. Oil discharge prevention device control
3-2. Reverse cycle start control
3-3. Inter systems refrigerant oil recovery control
3-4. Reverse cycle defrost control
Perform an oil discharge prevention control when starting from the stop mode.
When starting the operation after a long hour-stop mode under a low outdoor air temperature,
control the oil discharge prevention without rapidly increasing the compressor's frequency to avoid draining
the condensed refrigerant together with oil until the overheating inside the compressor is decreased.
•
In order to judge as to whether the compressor is to be started when in a high temperature state,
a starting pattern will be changed according to the discharge temperature.
(1)
*1
*2
*3
*4
Td: Discharge temperature
HPT: High pressure saturated temperature
K: Difference in temperature (1K=1°C)
Elec. cont. valve: Electronic control valve
Control in the Cooling Mode
(2)
Control in the Heating Mode
3. Special Controls
Mini VRF SYSTEM
Control Functions
Control hour
Outdoor unit
Indoor unit
Compressor
Fan
Fan
Cooling
Thermostat ON
Elec. cont. valve*
4
Thermostat OFF
OFF
Fan
Cooling
Thermostat ON
Thermostat OFF
OFF
Frequency 22Hz (Max. 3 minutes) → Without constraint
Preset wind speed
OFF
SH (super heat) control
20 pulse
20 pulse
20 pulse
Min. 1 minute to Max. 5 minutes
(Discharge degree-of-overheating: Td*
1
- HPT*
2
>
10K*
3
)
(2-1) Discharge temperature: less than 30°C
(2-2) Discharge temperature: over 30°C
Control hour
Outdoor unit
Compressor
Elec. cont. valve*
4
Frequency 54Hz
250pls (Max. 3 mins.) 480pls (Max. 17 mins.) → 300pls（Max. 3 mins.)
Indoor unit
Fan
Elec. cont. valve*
4
Preset wind speed or fixture setting to "Stop" by indoor unit control system
480Pulse
Min. 2 mins. 30 seconds to Max. 22 mins. 30 seconds
(Discharge degree-of-overheating: Td-HPT
>
12 K)
Control hour
Outdoor unit
Compressor
Elec. cont. valve*
4
Frequency 22Hz
A certain pulse calculated by the outside temperature and thermostat ON
Indoor unit
Fan
Elec. cont. valve*
4
Preset wind speed or fixture setting to "Stop" by indoor unit control system
80Pulse
Min. 1 min. to Max. 5 mins. 30 secs.
(Discharge degree-of-overheating: Td-HPT
>
12 K)
NOTE
*1
*2
*3
*4
Td: Discharge temperature
HPT: High pressure saturated temperature
K: Difference in temperature (1K=1
°C)
Elec. cont. valve: electric control valve
NOTE
SM830195-04_Mini VRF SYS.indb 8 15/03/10 17:47:33

Panasonic EAIRC-MJ Series Specifications

General

Brand	Panasonic
Model	EAIRC-MJ Series
Category	Air Conditioner
Language	English