Daikin FDMQ-R Series Service Manual

SiUS091601EA Control Specification
Part 4 Functions and Control 80
5.3 Controls at Mode Changing/Start-up
5.3.1 Preheating Control
Outline The inverter operation in open phase starts with the conditions of the outdoor temperature, the
discharge pipe temperature, the radiation fin temperature and the preheating command from the
indoor unit.
Details 09/15 class
Outdoor temperature ≥ –2.5°C (27.5°F) Control A (preheating for normal state)
Outdoor temperature < –2.5°C (27.5°F) Control B (preheating of increased capacity)
Control A
 ON condition
Discharge pipe temperature < 0°C (32.0°F)
Radiation fin temperature < 85°C (185°F)
 OFF condition
Discharge pipe temperature > 2°C (35.6°F)
Radiation fin temperature ≥ 90°C (194°F)
Control B
 ON condition
Discharge pipe temperature < 10°C (50.0°F)
Radiation fin temperature < 85°C (185°F)
 OFF condition
Discharge pipe temperature > 12°C (53.6°F)
Radiation fin temperature ≥ 90°C (194°F)
12/18/24 class
 ON condition
Discharge pipe temperature < Outdoor temperature x A + B
Outdoor temperature < C
Radiation fin temperature < D
 OFF condition
Discharge pipe temperature > Outdoor temperature x A + E
Outdoor temperature > F
Radiation fin temperature ≥ G
5.3.2 Four Way Valve Switching
Outline The four way valve coil is energized/not energized depending on the operation mode.
(Heating: ON, Cooling/Dry/Defrost: OFF)
In order to eliminate the switching sound as the four way valve coil switches from ON to OFF when
the heating is stopped, the OFF delay switch of the four way valve is carried out.
Details OFF delay switch of four way valve
The four way valve coil is energized for 160 seconds after the operation is stopped.
AB
CD
E
FG
(°C) (°F) (°C) (°F) (°C) (°F) (°C) (°F)
12 class 0/256 10 0 32 85 185 12 2 35.6 90 194
18/24 class 238/256 35 6 42.8 85 185 37 8 46.4 90 194

Daikin FDMQ-R Series Specifications

General

Brand	Daikin
Model	FDMQ-R Series
Category	Air Conditioner
Language	English