Hitachi RAS-8FSXN - External Output Function Setting

The sound operation can be adjusted by selecting the control function number.
Control function number Operating sound (targeted value)
Outdoor unit capacity (specification
ratio)
No setting Catalogue value 100%
11 (Low noise level setting 1) Catalogue value -2 dB(A) 80%
12 (Low noise level setting 2) Catalogue value -5 dB(A) 60%
13 (Low noise level setting 3) Catalogue value -8 dB(A) 40%
• Short-circuit terminals 1 and 2 (input 3) of CN18 to set the low noise setting.
N O T E
• The capacity of the outdoor unit will decrease because the compressor frequency and the outdoor unit fan
frequency necessarily decreases. The range of operation may be restricted.
• In some cases, the sound operation (key values) can be temporarily higher than the values in the table.
X1
1
2
CN18
X
SS3
X1
a b
c
d
a 3-pin connector
b Outdoor unit PCB1
c Control circuit
d Power source
X1 Auxiliary relay
SS3 Demand current stoppage
Example: Low noise setting 2 during night time only:
A Capacity
B Operating sound
C Daytime schedule
D Nighttime schedule
E Input terminal short-circuited
F Catalogue value [dB(A)]
G Catalogue value -5 dB(A)
6.2.2 External output function setting
The following signals can be received by the outdoor unit PCB.
6 Optional functions
120
SMGB0065 rev. 1 - 12/2010