Panasonic U-72MF2U9 Service Manual page 29

5. Outdoor Fan Control
5-1-3. Silent mode
This unit includes 2 types of silent modes.
See the table under the section "5-1. Fan mode" for maximum fan mode in silent mode.
Selecting the silent mode results in operation that gives priority to reducing noise, because these modes involve
restrictions on outdoor unit fan modes, the capacity will be somewhat reduced.
* The compressor capacity (frequency) is not limited.
However, the capacity of the compressor decreases by road map control because of the pressure caused by the
decreased fan speed of rotation.
* To activate this function, it is necessary to set it to each outdoor unit.
CODE: 05
Setting No.
0 Invalidity (Factory preset mode)
1
2
Silent priority
3
4
5
6
Capacity priority
7
8
9
10
Controlled in moderation
11
12
* When the setting is "external input to PCB necessary", this function works by short circuiting "SILENT" pins.
* When the setting is "external input to PCB unnecessary", this function always works.
* When the setting is "silent priority", max. fan mode is decided in the following formula.
Max. fan mode = 13 - ( 35 – Ambient temperature) / 2
However, minimum fan mode is "6", maximum is "13". (When high static pressure mode, max is "15")
* When the setting is "capacity priority", this function works excluding the following conditions.
Condition that silent mode interrupts
Heat exchanger [condenser] of outdoor unit: Ambient temperature ≥ 100.4°F (38°C)
Heat exchanger [evaporator] of outdoor unit: Ambient temperature ≤ 35.6°F (2°C)
This function will be useful for nighttime in summer.
* When the setting is "controlled in moderation", this function controls both "silent priority" and "capacity priority".
Thereof, "silent priority" fan mode is set within the temperature range of "capacity priority".
Mode External input to PCB Silent mode
-
Silent mode
Necessary
Silent mode
Unnecessary
Silent mode
Necessary
Silent mode
Unnecessary
Silent mode
Necessary
Silent mode
Unnecessary
1 - 21
3WAY VRF SYSTEM
Control Functions
-
Never use
Never use
Never use
Never use
Never use
Never use
1
2
3
4
5
6
7
8
9