SiE-05C
Functions
Functions Inverter K Series
39
1.11
Low Noise Control
If sound produced by outdoor units is a problem at night, etc., you can reduce the running noise by 2 to 3
dB by running the outdoor unit fans and compressors at low speed via contact input (low noise input) from
outside. When low noise input is received (contact short circuit) while the compressor is running (except
when defrosting or oil return is being carried out), the operation upper limit is as follows.
When cooling: Step1
→
2 high pressure > 24 kg/cm
²
(2.35 MPa)
Step2
→
1 high pressure < 19 kg/cm
²
(1.86 MPa)
Low noise control reduces capacity by limiting the fan and compressor. The load when heating is
particularly large at night when the outdoor temperature is low, and could result in insufficient capacity.
During low noise control, retry is unlimited for standby (forced thermostat OFF) produced by high
pressure, low pressure or discharge pipe temperature.
An optional external control adaptor of outdoor units is required for low noise control. For method of
connection, see low noise operation in the test operation section.
5K
8K
10K
(5HP)
(8HP)
(10HP)
Outdoor unit fan
step 1
L tap
H tap+OFF
step 2
L tap
L tap+OFF
compressor
60Hz
86Hz+OFF
96Hz+OFF
SI-05C.BOOK Page 39 Monday, November 6, 2000 4:13 PM
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