Cooling Operation; Auto Operation; Dry Operation - Toshiba Carrier RAS-12EKCV-UL Service Manual

Operation flow and applicable data, etc.
Item
1. Basic

2. Cooling operation

operation
The operations are performed in the following parts by controls according to cooling conditions.
1) Receiving the operation ON signal of the remote controller, the cooling operation signal
starts being transferred form the indoor controller to the outdoor unit.
2) At the indoor unit side, the indoor fan is operated according to the contents of "2. Indoor fan
motor control" and the louver according to the contents of "9. Louver control", respectively.
3) The outdoor unit controls the outdoor fan motor, compressor and pulse Modulating valve
according to the operation signal sent from the indoor unit.
Operation ON
Indoor unit control
Sending of operation command signal
Outdoor unit control

3. AUTO operation

One of 2 operations (Cooling or Fan only) is selected according to difference between the preset
temperature and the room temperature at which the automatic operation has started, as shown in
follow figure. The Fan only operation continues unit the room temperature reaches a level at which
another mode is selected.
*1. When reselecting the operation mode, the fan
speed is controlled by the previous operation mode.

4. DRY operation

DRY operation is performed according to the difference
between room temperature and the setup temperature as
shown below.
In DRY operation, fan speed is controlled in order to
prevent lowering of the room temperature and to avoid air
flow from blowing directly to persons.
°F [ C ]
Ta
+2.0 (1.0)
+1.0 (0.5)
Tsc
Ta
Cooling operation
Ts + 1
Monitoring (Fan)
Setup of remote controller
Indoor fan motor control / Louver control / Operation Hz
Control (Requierment)
Compressor revolution control / Outdoor fan motor control /
Operation Hz control (Include limit control)
Pulse Modulating valve control
4-way valve control (In cooling operation: ON)
L– (W5)
(W5+W3) / 2
SUL (W3)
Fan speed
− 29 −
FILE NO. SVM-13071
Description
1) Detects the room temperature (Ta) when
the DRY operation started.
2) Starts operation under conditions in the
left figure according to the temperature
difference between the room tempera-
ture and the setup temperature (Tsc).
Setup temperature (Tsc)
= Set temperature on remote controller
(Ts) + 0~1.0°C (0 to 2°F)
3) When the room temperature is lower
2°F (1°C) or less than the setup
temperature, turn off the compressor.