Basic Control; Normal Operation - Daikin VRV III RXYQ5-54PY1 Service Manual

Basic Control

2.

Basic Control

2.1

Normal Operation

2.1.1 List of Functions in Normal Operation
Part Name
Compressor
Outdoor unit fan
Four way valve
Main motorized valve
Subcool heat exchanger
electronic expansion valve
Hot gas bypass valve
Accumulator oil return valve SV0
Indoor unit actuator
Fan
Electronic
expansion
valve
*1. PI control : Evaporator outlet superheated degree (SH) constant.
*2. PI control : Condenser outlet subcooled degree (SC) constant.
*1 and 2 : Refer "6.6 Electronic expansion valve control" on page 135.
94
(Electric
Symbol
Symbol)
PI control, High pressure
protection, Low pressure

(M1C, M2C)
protection, Td protection,
INV protection,
(M1F) Cooling fan control
20S1 (Y1R) OFF
EV1 (Y1E) 480 pls
EV2 (Y2E) PI control
SVP (Y1S) OFF
(Y2S) ON
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Thermostat ON unit
Stopping unit
Thermostat OFF unit
Function of Functional Part
Normal Cooling
Normal cooling
Remote controller setting
OFF
Remote controller setting
*
Normal opening 1
0 pls
0 pls
Si34-601A
Normal Heating
PI control, High pressure
protection, Low pressure
protection, Td protection,
INV protection,
Step 7 or 8
ON
PI control
PI control
Energized when the system is set
to low pressure control mode
ON
Normal heating
Remote controller setting
OFF
LL
*
Normal opening 2
200 pls
200 pls
Function