PACD011001C2 Function
Function Urban Multi “MX1, ME1 Series” Using R-22 47
1.15 Low Noise Control
If the 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/cm² (2.35 MPa)
Step2
→
1 high pressure < 19 kg/cm² (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 BMS interface adaptor for outdoor units is required for low noise control. For method of
connection, see low noise operation in the test operation section.
CU-5 CU-8 CU-10
(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
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