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Toshiba
8-3.
Hydro Unit
Control
1-2)High temperature release control
A heat pump operation is performed as shown in the table below according to the TC sensor detecting temperature.
• For the detected temperature, TC (= TWO + 2 degree) of a heat pump operation is used. The values of T7 through
T10 vary depending on TWI. (See the table below)
• If the compressor frequency instruction from the hydro unit is less then 10 Hz, the compressor stops.
• TC > 62°C causes the compressor to stop abnormally. When the compressor restarts 140 seconds after the stop
and TC > 62°C is not detected for 20 minutes, the abnormal stop counter is cleared. 10 times of compressor
abnormal stop stops the operation of heat pump, and confirms the abnormality (Display: A11).
* If the heat pump operation is switched to other operation, the abnormality detection counter is reset to 0.
TC=TWO+2deg (°C)
1-3)Low temperature release control
A heat pump operation is performed as shown in the table below according to the TC sensor detecting temperature.
• For the detected temperature, TC = TWO of a heat pump operation is used. The values of T7 through T10 varies
depending on TWI. (See the table below)
• If the compressor frequency instruction from the hydro unit is less then 10 Hz, the compressor stops.
• TC < 3°C causes the compressor to stop abnormally. When the compressor restarts when 140 seconds has
passed after the stop and TC < 3°C is not detected for 20 minutes, the abnormal stop counter is cleared. 10 times
of compressor abnormal stop stops the operation of heat pump, and confirms the abnormality (Display: A11).
* If the heat pump operation is switched to other operation, the abnormality detection counter is reset to 0.
TC=TWO (°C)
Item Operation flow and applicable data, etc.
T11
(62.0
°C
)
TC (TWO+2)
Forcible stop
O (down)
P (slow down)
Q (keep)
R2 (slow up)
R1
(slow up)
S (normal)
T9
T10
T8
T7
Zone Control operation
R1 Increase compressor frequency by 1.2 Hz every
60 secs.
R2 Increase compressor frequency by 0.6 Hz every
60 secs.
O Decrease compressor frequency to 70% every
10 secs.
P Decrease compressor frequency by 3 Hz every
10 secs.
Q Keep compressor frequency.
TWI T7T8T9T10T11
TWI<30 57.0 59.0 60.0 61.0 62.0
30 TWI<35 57.0 59.0 60.0 61.0 62.0
35 TWI<40 56.5 58.5 59.5 60.5 62.0
40 TWI<45 56.5 58.5 59.5 60.5 62.0
45 TWI<50 56.0 58.0 59.0 60.0 62.0
50 TWI 56.0 58.0 59.0 60.0 62.0
T7
Forcible stop
O (down)
P (slow down)
Q (keep)
R2 (slow up)
R1
(slow up)
S (normal)
T9
T8
T10
T11
TC (TWO)
Zone Control operation
R1 Increase compressor frequency by 1.2 Hz every
60 secs.
R2 Increase compressor frequency by 0.6 Hz every
60 secs.
O Decrease compressor frequency to 70% every
10 secs.
P Decrease compressor frequency by 3 Hz every
10 secs.
Q Keep compressor frequency.
TWI T7T8T9T10T11
TWI<10 10.0 8.0 6.0 4.0 3.0
10 TWI<15 10.5 8.5 6.5 4.5 3.0
15 TWI<20 11.0 9.0 7.0 5.0 3.0
20 TWI 11.5 9.5 7.5 5.5 3.0
+00A09-002_01EN_SVM_ALL_Air_to_Water.book Page 49 Monday, October 5, 2009 2:09 PM