System Refrigeerant Piping Schematic Diagrams - Carrier MMY-MAP0724FT9UL Service Manual

5. SYSTEM REFRIGERANT 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.
Mainly cooling
Before exchange
Mainly heating
Note)
In the table, status of 4-way valve is indicated in parenthesis.
<Exchange unit valve ON-OFF list>
Indoor operation mode
1. Stop (Remote controller OFF)
<When all the system stop>
2. Cooling thermo OFF
3. Cooling thermo ON
4. Heating thermo OFF
5. Heating thermo ON
6. During detection of [E04] error
All cooling
(OFF)
All cooling
(OFF)
Operation continuation
(ON) (ON
Momentary stop
(ON) (ON
All heating Momentary stop
(ON) (ON
Control valve output outline of cooling/heating exchange unit (Operation standard)
SVD
(High-pressure circuit valve)
OFF
<OFF>
OFF
OFF
ON
OFF
After exchange
Mainly cooling
(ON)
Operation continuation
(OFF ON)
OFF)
Operation continuation
OFF) (ON as it is)
Operation continuation
OFF) (ON as it is)
SVDD
(Pressure valve <For delay>)
OFF
<OFF>
OFF
OFF
OFF
ON
– 51 –
Mainly heating
(ON)
Operation continuation
(OFF ON)
Operation continuation Operation continuation
(ON as it is)
Operation continuation
Operation continuation
(ON as it is)
SVS
(Low-pressure circuit valve) (Regulator valve <For delay>)
OFF
<OFF>
OFF
ON
OFF
OFF
All heating
(ON)
Momentary stop
(OFF ON)
(ON as it is)
(ON as it is)
SVSS
ON
<OFF>
ON
ON
OFF
OFF