Panasonic U-20ME1E81, Руководство по обслуживанию

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2WAY SYSTEM
Control Functions
-
Outdoor Unit
1 - 26
1
8. 4-Way Valve Adjustment Control
8. 4-Way Valve Adjustment Control
2WAY SYSTEM
Control Functions-Outdoor Unit
This control is to change over the 4-way valve appropriately with big differential pressure.
8-2-1. Whole Process
8-2-2. 4-way valve adjustment control Process
8-1. Start of 4-way valve adjustment control
8-2. Simplified flow of 4-way valve adjustment control
When the microcomputer is initialized immediately after power-ON.
After a set amount of time has elapsed 60 minutes when all outdoor units are stopped.
After warning output occurs
Tube refrigerant recovery control shall be performed as the flow mentioned below.
(0) Stopped
(1) 4-way valve adjustment control processing time
(1) Control when the outdoor unit heat exchanger is acting as a condenser
(2) Control when the outdoor unit heat exchanger is acting as an evaporator
(2) Post-processing time of 4-way valve adjustment control for non stop operation
(3) Normal operation
* When the above operation is finished, normal operation starts at the horsepower determined by the indoor units
where thermostats are ON.
2 minutes
All outdoor units operate at maximum horsepower.
Valves at all indoor units operate at a fixed pulse according to
the indoor unit capacity.
Fan operates at the set fan speed depending on the indoor unit
operation mode.
Control time
Outdoor units
Electronic control valve
Fan
All Indoor Units
* When the above operation is finished, normal operation starts at the horsepower determined by the indoor units
where thermostats are ON.
All outdoor units operate at maximum horsepower.
Valves at all indoor units operate at 250 pulses.
Control time
Outdoor units
Electronic control valve
Fan
As for heating thermostat ON indoor units, follow the indoor unit
control system.
The fan speed of the heating thermostat OFF high static pressure
ducted type indoor unit (Type E1) is changed to LL.
Fan and/or heating (thermostat OFF) operation of indoor unit will be
stopped.
All Indoor Units
Minimum 1 minute – Maximum 21 minutes (Until Tc 35°C)
>_
9. Defrost Control
2WAY SYSTEM
Control Functions-Outdoor Unit
EEPROM setting in main outdoor unit
CODE: A3
Setting No.
20
21
40
90
XX
20
21
Interval of “1”
40
(factory preset mode)
Never use
41
System employs
1 outdoor unit in the refrigerant system
2 or more outdoor units in the refrigerant system
Defrost control method
Reverse cycle defrost
Ambient air
temperature
Minute XX + 6 XX + 3 XX
Outdoor unit cycle defrost
This system uses the following 2 defrosting systems.
Time until next defrost permission when defrost was completed is changed according to the ambient air temperature.
Frost detection does not occur for 10 minutes after operation starts.
Defrost does not begin again for 40 minutes of operation after defrost was once completed.
If all indoor units are stopped while defrosting, or if the outdoor unit is stopped due to protection control or
another reason, then defrost control will not start for a minimum of 5 minutes after restart occurs.
9-1. Defrost Methods
9-2. Constraint Conditions
To ≤ -10°C -10 < To ≤ -5°C -5°C < To
9-3. Frost Detection
(1) Frost detection does not occur for 5 minutes after operation starts.
(2) Frost is detected when either condition 1 or 2 below is met.
Condition 1: L2 line or below is detected twice, each time continuously for 4 minutes, when the compressor
is operating.
Condition 2: L1 line or below is detected for a total of 60 minutes when the compressor is operating.
–25.5
–27.5
–10
The frost detection area is
located under the thick lines
L2
L1
–3
–25
–8
–1
10
10 External temperature°C
Heat exchange liquid temperature °C
Defrosting operation
end temperature
(The end temperature
is different from the
above detection
temperature.)
SM830204-05_2WAY SYS.indb 26 2015/01/21 17:00:03