Daikin R407C PLUS, Service Manual

Page: 82 / 267

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)