Carrier 40TGV0131UP Service Manual page 38

No. Item
6 Freeze
preventive control
(Low temperature
release)
7 Drain pump
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 fro
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 6°C to 12°C until [ I ] zone is detected
and the indoor fan operates with [L] mode.
(°C)
6
2
1) In cooling operation (including Dry operation), the drain
pump is usually operated.
2) If the float switch works while drain pump drives, th
compressor stops, the drain pump continues the
operation, and a check code is output.
3) If the float switch works while drain pump stops, th
compressor stops and the drain pump operates. If the
float switch keeps operating for approx. 4 minutes,
check code is output.
A
I
K
J
- 38 -
Remarks
Tcj:
Indoor heat exchanger
sensor temperature
Check code [P10]