Toshiba RAV-RM301KRTP Series Service Manual page 32

No. Item
8 Freeze preventive control
(Low temperature release)
9 High-temp. release
control
Outline of specifications
1) The cooling operation (including Dry operation) is
performed as follows based on the detected
temperature of Tc sensor or Tcj sensor.
When [J] zone is detected for 6 minutes
(Following figure), the commanded frequency is
decreased from the real operation frequency.
After then the commanded frequency changes every
30 seconds while operation is performed in [J] zone.
In [K] zone, time counting is interrupted and the
operation is held.
When [ I ] zone is detected, the timer is cleared and
the operation returns to the normal operation.
If the commanded frequency becomes S0 because
the operation continues in [J] zone, the return
temperature A is raised from 8°C to 12°C until [ l ]
zone is detected and the indoor fan operates
with [L] mode.
[˚C]
8
5
In heating operation, the freeze-preventive control
works if 4-way valve is not exchanged and the
following conditions are satisfied.
(However the temperature for J zone dashing control is
changed from 5°C to –5°C.
<Conditions>
Q R
• When or is established 5 minutes after
activation.
Q
Tcn ≤ Tc (n – 1) – 5
R
Tcn < Tc (n – 1) – 1 and Tcn ≤ Ta < 5°C
1) The heating operation is performed as follows based on the detected temperature
of Tc sensor or Tcj sensor.
• When [M] zone is detected, the commanded frequency is decreased from the
real operation frequency. After then the commanded frequency changes every
30 seconds while operation is performed in [M] zone.
• In [N] zone, the commanded frequency is held.
• When [L] zone is detected, the commanded frequency is returned to the original
value by approx. 6Hz every 60 seconds.
Setup at shipment
Control temp. °C
A
56
54
NOTE:
When the operation has started or when Tc or Tcj < 30°C at start of the
operation or after operation start, temperature is controlled between values in
parentheses of A and B.
- 32 -
A
I
K
J
Tc, Tcj
B
52
52
FILE NO. SVM-18059
Remarks
Tcj:
Indoor heat exchanger
sensor temperature
Tcn:
Tc temperature when
5 minutes elapsed
after activation
Tc (n – 1):
Tc temperature at
start time
˚C
M
A
N
B
L