Daikin R407C PLUS - Protection Control, Etc

Si33-105 Outline of Control (Outdoor Unit) < Symbols using in this manual >
Function R407C PLUS Series Heat Recovery System 71
3.5 Protection Control, etc.
3.5.1 Low Noise Control
!
Should the noise from outdoor unit cause a problem in the night-time, etc., operates the
outdoor fan and compressor at low speed based on an external contact input (low noise
input) to reduce the operating sound.
Contents
!
During compressor operation excluding oil return and defrosting operation, conducts the
following operation if low noise input is provided (short circuit of contact points).
!
In heating operation and simultaneous cooling/heating mode
Th1< 0°C
→
Low noise input is invalid
Th1> 2°C
→
Low noise input is valid
1. Outdoor fan : In cooling operation, take the value shown in the following table as the upper
limit. In heating and simultaneous cooling/heating mode, see separate table (on next page).
2. Compressor : Take the value shown in the following table as the upper limit.
!
Regarding 24 to 34HP compressors, since the fan (M12F) on the inverter box side stops
during operation in fan tap  or lower, change the fan to M11F by Tfin.
3. When receiving "Fin temperature drooping signal" from inverter, neglects the low noise
input.
16·18·20HP 24·26·28·30HP
Fan tap $ H+OFF / ON+OFF H+OFF+ON+OFF / ON+OFF
Fan tap
%
H+ON / ON+ON H+ON+ON+ON / ON+ON
Compressor upper limit
frequency
16HP 58Hz+OFF
18HP 75Hz+OFF
20HP 75Hz+OFF
24HP 41Hz+ON+OFF
26HP 41Hz+ON+OFF
28HP 41Hz+ON+OFF
30HP 41Hz+ON+OFF
Fan tap 
Pc>2.58MPa
Pc<1.87MPa
Fan tap 
(V2580)
M11F = H / L / OFF
M12F = OFF

0
M11F = OFF
M12F = ON
Tfin>87˚C
Tfin<67˚C
(V2581)