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8-3.
1-2) Low temperature release control
Hydro Unit 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 fault code A11 is displayed on the remote
controller.
* If the heat pump operation is switched to other operation, the abnormality detection counter is reset to 0.
TC (TWO)
TC=TWO
TWI
TWI<10
10 ≤ TWI<15
15 ≤ TWI<20
20 ≤ TWI
1-3) Freeze release control (TC+TWO release control)
For freeze prevention, the compressor is controlled during cooling operation as shown in the table below according
to the calculated values of TC and TWO.
• If TC + TWO falls below -15 for a total of 10 times, the compressor stops abnormally and fault code A10 is displayed
on the remote controller.
• When cooling operation has lasted normally for 10 minutes, the abnormality detection counter is reset to 0.
TC+TWO
T7
T8
T9
TC+TWO
Operation flow and applicable data, etc.
S (normal)
T7
R1
R2 (slow up)
(slow up)
T8
Q (keep)
T9
P (slow down)
T10
O (down)
T11
Forcible stop
T7
T8
8.0
6.0
8.5
6.5
9.0
7.0
9.5
7.5
T7
T8
T9
6.0
4.0
-15
Zone
(°C)
T9
T10
T11
4.0
3.0
2.5
4.5
3.4
2.5
5.0
4.0
2.5
5.5
4.5
2.5
Zone
S : Normal
S (normal)
P : Down
P (slowdown)
O : Down
O (down)
Forced stop
(Forced stop)
55
Control operation
R1
Increase compressor frequency by 0.8 Hz every
60 sec.
R2
Increase compressor frequency by 0.4 Hz every
60 sec.
O
Decrease compressor frequency by 4.5 Hz every
10 sec.
P
Decrease compressor frequency by 2.4 Hz every
10 sec.
Q
Keep compressor frequency.
Control operation
Normal cooling operation
Decrease compressor frequency by approx.
2.0 Hz every 10 sec.
Decrease compressor frequency by approx.
4.0 Hz every 10 sec.
Stop the compressor.
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