Basic Control; Normal Operation - Daikin RXYQ5-48MAY1 Service Manual

Basic Control

2.

Basic Control

2.1

Normal Operation

2.1.1 List of Functions in Normal Operation
For master units
Part Name
Compressor
Outdoor unit fan
Four way valve
Main motorized valve
Subcool heat exchanger
electronic expansion valve
Hot gas bypass valve
Receiver gas discharging
valve
Non-operating unit liquid
pipe stop valve
76
(Electric
Symbol
Symbol)
PI control, High pressure
protection, Low pressure
protection, Td protection,

(M1C, M2C)
INV protection,
High differential pressure
protection
(M1F) Cooling fan control
20S1 (Y1R) OFF
EV1 (Y1E) 2000 pls
EV2 (Y2E) PI control
Energized when the system is set
SVP (Y1S)
to low pressure control mode
SVG (Y4S) OFF
SVSL (Y6S) ON
Function of Functional Part
Normal Cooling
Si39-407
Normal Heating
PI control, High pressure
protection, Low pressure
protection, Td protection,
INV protection,
High differential pressure
protection
Step 7 or 8
ON
Subject to heat exchange mode
0 pls
Energized when the system is set
to low pressure control mode
OFF
ON
Function