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4. SYSTEM REFRIGEERANT PIPING SCHEMATIC DIAGRAMS
<Exchange of operation mode>
For exchange between each operation mode, follow the table below: When “Momentary stop” is executed, the
unit does not operate for 3 minutes after stop of operation before update.
Before exchange
After exchange
Single heating
(ON)
Collective heating
(ON)
Collective cooling
(ON)
Single cooling
(OFF)
Momentary stop
(OFF Æ ON)
Operation continuation
(OFF Æ ON)
Operation continuation
(OFF Æ ON)
Single cooling
(OFF)
Operation continuation
(ON as it is)
Operation continuation
(ON as it is)
Operation continuation
(ON Æ OFF)
Collective cooling
(ON)
Operation continuation
(ON as it is)
Operation continuation
(ON as it is)
Momentary stop
(ON Æ OFF)
Collective heating
(ON)
Operation continuation
(ON as it is)
Operation continuation
(ON as it is)
Momentary stop
(ON Æ OFF)
Single heating
(ON)
Control valve output outline of cooling/heating exchange unit (Operation standard)
SVD
(High-pressure circuit valve)
SVDD
(Pressure valve <For delay>)
SVS
(Low-pressure circuit valve)
SVSS
(Regulator valve <For delay>)
Note)
In the table, status of 4-way valve is indicated in parenthesis.
Indoor operation mode
OFF
<OFF>
1. Stop (Remote controller OFF)
<When all the system stop>
OFF
<OFF>
OFF
<OFF>
ON
<OFF>
OFF2. Cooling thermo OFF OFF OFF ON
OFF3. Cooling thermo ON OFF ON ON
OFF6. During detection of [E04] error ON OFF OFF
ON
4. Heating thermo OFF
OFF OFF OFF
5. Heating thermo ON
<Exchange unit valve ON-OFF list>
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