Low Noise Control - Panasonic Urban Multi MX1R Series Service Manual

Function
1.15

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.
Outdoor unit fan
compressor
‹ When cooling: Step1 → 2 high pressure > 26.6 kg/cm² (2.61 MPa)
„ Low noise control reduces capacity by limiting the fan speed and compressor frequency. The load when
„ 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
260
step 1
step 2
Step2 → 1 high pressure < 20.8 kg/cm² (2.04 MPa)
heating is 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
62Hz 86Hz+OFF
Function Urban Multi "MX1R, ME1R Series" Using R-407C
PACD011001C2
CU-10
(10HP)
H tap+OFF
L tap+ON
96Hz+OFF