Operation Mode Control; Master Control - Fujitsu Airstage V-II Service Manual

3-2 MASTER CONTROL

3-2-1 Operation Mode Control

Each operation mode is controlled as below.
(1) Stop mode
Indoor fan motor
Electric expansion valve
Drain pump
(2) Cool, Dry and Heat Mode
Indoor fan motor
Drain pump
Electrical
expansion valve
3) Priority mode
(
The purpose of the priority mode is to restrict operation commands (heating, cooling, dry) from the
connected indoor units. There are 3 priority modes of Neutral, Cooling Priority, and Heating Priority.
The operation modes restricted by each of these modes are as follows:
Priority mode
Neutral
Cooling priority
Heating priority
1. Priority mode decision methods
Method 1. (Default value)
The initial priority mode is made Neutral and is shifted to Cooling Priority when cooling and to Heating
Priority when heating depending on which operation mode (cooling, heating) was input first.
After shifting to Cooling Priority or Heating Priority, the priority mode shifts to Neutral only when there
was a Stop input from all the indoor units.
Cooling priority
Method 2. (Management by outdoor unit)
Operation mode management is made "Management by outdoor unit" by outdoor unit PUSH-SW
(field setting).
The priority mode shifts to Cooling Priority or Heating Priority in accordance with input from the outdoor
unit regardless of the current mode.
Cooling priority
: OFF
: Stop pulse
: Turns ON-OFF by the drain pump control function
Cool
Operates according to See the fan control
the AIR FLOW-MODE page.
setting.
Turns ON-OFF by the drain pump control function
Pulse controlled by
Pulse controlled by
the temperature dif-
the temperature differ-
ference calculation
ence calculation and
and frost prevent
frost prevent fuction
function
Restricted operation mode
No restrictions
Heating
Cooling, dry
Neutral
Heating priority
Heating priority
Dry Heat
Operates according to
the AIR FLOW-MODE
setting, and besides
cold air prevention
operation
Pulse controlled by
the temperature dif-
ference.
03-02