Daikin R407C PLUS - Page 46

Si33-105 Refrigerant System Diagram
Function R407C PLUS Series Heat Recovery System 35
No. Name Code Function Remarks
1 Outside air thermistor R1T Detects outside temperature and uses it as a function in
determining defrost IN conditions during heating operation.
2
Heat exchanger thermistor 1
R21T Uses inlet temperature of each heat exchanger as a function
(together with outside temperature data) in determining defrost IN
conditions during heating operation.
3
Heat exchanger thermistor 2
R22T
4
Heat exchanger thermistor 3
R23T
5
Discharge pipe thermistor 1
R31T Detects discharge pipe temperature of inverter compressor and
use it for compressor discharge pipe temperature protection.
6
Discharge pipe thermistor 2
R32T Detects discharge pipe temperature of constant-speed
compressor 1 and use it for compressor discharge pipe
temperature protection.
7
Discharge pipe thermistor 3
R33T Detects discharge pipe temperature of constant-speed
compressor 2 and use it for compressor discharge pipe
temperature protection.
8 Suction thermistor 1 (Hx. 1) R41T Detects outlet temperatures of heat exchangers and uses it in
constant superheated degree (SH) control (electronic expansion
valve control)
9 Suction thermistor 2 (Hx. 2) R42T
10 Suction thermistor 3 (Hx. 3) R43T
11 Suction pipe thermistor R6T Detect accumulator outlet temperature and protect compressor.
12 Liquid pipe thermistor R8T Detect liquid receiver outlet temperature and judge the Y5S open/
close under liquid pressure control.