Capacity Control; Auto Changeover Operation - Fujitsu ASU18RLF Service Instructions Manual

1. CAPACITY CONTROL

Compressor frequency decides by capacity of an indoor unit, operation number of an indoor unit,
set temperature, room temperature and outside temperature.

2. AUTO CHANGEOVER OPERATION

When the air conditioner is set to the Auto mode by remote controller, operation starts in the optimum
mode from among the Heating, Cooling, Dry and Monitoring mode.
During operation, the optimum mode is automatically switched in accordance with temperature changes.
The temperature can be set between 64°F(18°C) and 86°F(30°C) in 2°F(1°C) steps.
When operation starts, indoor fan and outdoor fan are operated for around 3 minutes.
Room temperature and outdoor temperature are sensed,
and the operation mode is selected in accordance with the table below. <Monitoring mode>
( Table 1 : Operation mode selection table )
Room temperature (TR)
TR> Ts+4°F(+2°C)
Ts+4°F(+2°C)
TR < Ts -4°F(-2°C)
*
If it's Middle zone, operation mode of indoor unit is selected as below.
( 1 ). Same operation mode is selected as outdoor unit.
If outdoor unit is operating in Cooling, Dry, and Heating mode,
indoor unit will be operated by the same operation mode.
( 2 ). Selected by the outdoor temperature.
If outdoor unit is operating in other than Cooling, Dry, and Heating mode,
indoor unit will be operated according to the outdoor temperature as below.
( Fig. 1 : Outdoor temperature zone selection )
77°F (25°C)
When Heating was selected at
page 01-08 is performed.
When the compressor was stopped for 6 consecutive minutes by the temperature control
function after the Cooling(Auto:Dry) or Heating mode was selected at above,
operation is switched to Monitoring and the operation mode is selected again.
Operation mode
Cooling
(Autmatic dry)
*
Middle zone
TR Ts -4°F(-2°C)
Heating
Cooling mode
Heating mode
, the same operation as HEATING OPERATION of
01-01
TR : Room temperature
Ts : Setting temperature