Toshiba MMU-P0121H Service Manual page 38

Item
4. Automatic (1) Based upon difference between Ta and Ts, the operation
capacity control frequency is indicated to the outdoor unit.
NOTE :
The operation frequency in the above zone differs according to
horse power or protective control of the outdoor unit.
5. Capacity (1) Frequency correction control
correction
Frequency of the outdoor unit is corrected so that the present
control
capacity reaches to the certain specified capacity.
(2) PMV opening correction control
PMV opening is corrected so that the refrigerant status of the
indoor unit becomes most appropriate status.
6. Air volume (1) By the command from the remote controller or the central
control controller, "HIGH", "MED.", "LOW", or "AUTO" operation is
executed.
(2) The status becomes "Ultra LOW" and "STOP" when thermostat
is turned off during heating operation.
(3) While air volume is in AUTO mode, the air volume is changed
according to the difference between Ta and Ts.
+2
+ 1
7. Prevention of (1) In heating operation, the indoor fan is controlled based upon the
cold air detection temperature of TC2 (Temperature sensor of indoor
discharge heat exchanger).
Operation explanation and applied data, etc.
COOL
+ 2
SD
SB
+ 1
S9
S7
Ts
S5
S3
S0
– 1
Compressor-
OFF
COOL
HIGH
MED.
Ts
LOW
(˚C)
30
A
B
26
20
C
16
HEAT
+ 1
Compressor
S0
S3
OFF
S5
Ts
S7
S9
– 1
SB
SD
–2
SF
HEAT
+1
Ultra LOW
(Compressor-OFF)
Ts
LOW
–1
MED.
–2
HIGH
A zone : Set air volume from
remote controller
B zone : Low air
C zone : OFF
3-35
Remarks
Ts : Set up temp.
Ta : Room temp.
Duct : Air volume "FIX".
"STOP" controls
prevention of cold air
discharge by TC2.
"PRE-HEAT/DEFROST"
go on.