Low Noise Control - Panasonic Urban Multi MX1R Series Service Manual

PACD011001C2
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.
Outdoor unit fan
Compressor
‹ When cooling: Step1 → 2 high pressure > 24 kg/cm² (2.35 MPa)
„ Low noise control reduces capacity by limiting the fan and compressor. The load when heating is
„ During low noise control, retry is unlimited for standby (forced thermostat OFF) produced by high
„ An optional BMS interface adaptor for outdoor units is required for low noise control. For method of
Function Urban Multi "MX1, ME1 Series" Using R-22
step 1
step 2
Step2 → 1 high pressure < 19 kg/cm² (1.86 MPa)
particularly large at night when the outdoor temperature is low, and could result in insufficient capacity.
pressure, low pressure or discharge pipe temperature.
connection, see low noise operation in the test operation section.
CU-5 CU-8
(5HP) (8HP)
L tap
L tap
60Hz 86Hz+OFF
Function
CU-10
(10HP)
H tap+OFF
L tap+OFF
96Hz+OFF
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