Functions; Operation Functions; Functions 8-1. Operation Functions - Sanyo SAP-DMRV93GJ Technical & Service Manual

8. FUNCTIONS

8-1. Operation Functions

■ Functions of the main unit controller
1 OFF
: • Used to stop the unit when the remote
(Self-diagnostics) controller is unavailable.
• Used when service inspection is performed.
2 ON
: • During normal operation: Starts operation
from the remote controller.
• Emergency operation: When the remote
controller is unavailable, moving this switch
from the OFF position to the ON position
starts automatic operation.
3 TEST
: • Used when operating performance are
checked.
• Used when pump-down is carried out.
(Operates at the rated frequency. At this
time, the main unit lamp flashes, and the
remote controller signal cannot be
received.)
4 DEMO
: • This function is for shop displays. Ordinarily
it is not used.
• Used during servicing.
■ Automatic operation
● Operating mode selection
When automatic operation is selected, the indoor and outdoor
temperature sensors function, and either HEAT, DRY, or COOL
mode operation is selected automatically.
Indoor temperature
15°C
(Approx.)
(Approx.)
22°C
20°C
18°C
● Desired-temperature memory
• The set temperature in the program can be changed as
desired within the range of ±4°C. This temperature can then
be stored. During automatic operation, press the temperature
setting buttons to change the temperature.
Set
temperature
22°C 27°C (standard)
27°C
COOL
mode
DRY
Temperature
mode
at which
operation
starts
(Range:
20 – 26°C)
■ SENSOR DRY
During automatic operation, the system adjusts the room
temperature and fan speed according to the conditions in the
room, in order to maintain a comfortable room environment.
SENSOR DRY operation
• DRY operation is as shown in the figure below.
Load
COOL zone
A zone
B zone
Conditions are monitored at all
times when the room temperature
is below 15°C.
DRY A
The compressor operation frequency varies depending on the
relative humidity.
The indoor fan operates with 1/f fluctuation.
DRY B
The compressor operates at a low operating frequency.
The indoor fan operates with 1/f fluctuation.
Monitor
• Monitoring operation takes place when the room temperature
is below 15°C.
• When the monitoring range is entered, the compressor stops,
and the indoor fan operates at LL.
■ PAM-α control
• In order to further improve inverter performance, control is
switched between PWM control at low operation speeds, and
PAM control at high operation speeds, making the most
effective use of power.
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