Mitsubishi Electric BDT CITY MULTI Installation And Pre-Commissioning Booklet page 65

Minimum operating frequency adjustment
In some low load situations low operating frequency chatter can cause noise concerns. In these situations adjusting the
minimum operating frequency may be the best option and will remove this low frequency chatter. However, it is important
to know that this may also reduce the minimum operating capacity of some indoor units causing them to have less accurate
temperature control.
MINIMUM COMPRESSOR FREQUENCY FOR PURY-YJM
P200/P250
EP250
Cooling Only
Cooling Main
SW3-1=OFF
SW3-2=OFF 14
SW3-5=OFF
SW3-1=ON
SW3-2=OFF 14
SW3-5=ON
SW3-1=ON
20
SW3-2=OFF
SW3-5=OFF
PUHY/PURY-P***YKB/YLM – To increase minimum frequency in cooling adjust function 936.
Set SW4-4,6,8,9,10 to "ON" LED1 will display the current value. To adjust, set SW6-10 to "ON" and press and hold SWP1 for 2sec, LED3
will become lit to indicate the function is now on. Set SW6-10 back to "OFF" to display the new value on LED1. Repeat to reach the desired
frequency. Set all of SW4 back to "OFF" for LED1 display to return to normal.
PUHY/PURY-P***YKB/YLM – To increase minimum frequency in heating adjust function 937.
Set SW4-1,4,6,8,9,10 to "ON" LED1 will display the current value. To adjust, set SW6-10 to "ON" and press and hold SWP1 for 2sec, LED3
will become lit to indicate the function is now on. Set SW6-10 back to "OFF" to display the new value on LED1. Repeat to reach the desired
frequency. Set all of SW4 back to "OFF" for LED1 display to return to normal.
DIP SWITCHES BRANCH CONTROLLERS
Switch functions <BC controller> (Control board)
Switch Function
1 Model setting
2 - 5 -
SW4
*1
6 No. of ports
, 7 8 -
1 - 6 -
SW5 7 M o d e s l e t t n i g
8 M o d e s l e t t n i g
*1. When a junction pipe kit was used to merge two ports to connect the indoor units with a total capacity of between P81
and P140, turn DIP SW4-6 to ON. When connecting a main and a sub BC controller, change the SW setting on only the
main BC controller. (It is not necessary to change the SW setting on the sub BC controller. )
Model setting
Switch
OFF
OFF
SW5-7
ON GA1 (HA1) type
COMMON DIP SWITCHES
SW4-6
Used when any indoor unit sized between P81 and P140 uses 2x ports on the branch controller.
In this case the port address must be set at the lowest port number.
P300/P350/P400
EP250/EP300
Heating Only Cooling Only
Heating Main Cooling Main Heating Main
19 18
10 18
21 30
Function according to switch setting
OFF
R410A
-
1
-
-
R f e r e o t h t e a t b e l b e o l . w
R f e r e o t h t e a t b e l b e o l . w
SW5-8
ON
G1 type
GB1 (HB1) type
P450
EP350
Heating Only Cooling Only Heating Only
Cooling Main Heating Main
15 18
24 18
28 30
Switch setting timing
ON
- Always leave this switch to OFF.
-
2 B e o f e r b e n i g e n
-
-
B e o f e r b e n i g e n
B e o f e r b e n i g e n
15
24
35
-
e g r z i e d
-
-
e g r z i e d
e g r z i e d
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