Mitsubishi Electric CAHV-R450YA-HPB Installation & Operation Manual page 23

4. Perform an initial setup.
(1) Set dip switches SW7-1, -2, -3, and -4 to ON (labeled A in the figure at
right).
[EEEE] will appear in LD301 (labeled B in the figure at right). *1
(2) Press and hold the push switch (SWP3) (labeled C in the figure at right)
for one second or longer.
• While the system is starting up [9999] will appear on LD301 (labeled B
in the figure at right).
(3) Set dip switches SW7-1, -2, -3, and -4 to OFF (labeled A in the figure at
right).
The start-up process is complete, and the settings for such items as
clock, peak-demand control, schedule, and thermistor settings can now
be made.
*1 If the start-up process has already been completed, [FFFF] (instead of [EEEE]) will appear when the dip switches
SW7-1, 2, 3, 4 are set to ON.
(4) System configuration procedures : Multiple system
1. Set the dip switches and rotary switches.
System configuration diagram
External
water
temperature
sensor
Field-supplied dry
contact switch/relay
or remote controller
SW5-8: ON
SW5-9: ON
Address: 1
* The main unit is the unit to which an external water temperature sensor is connected.
Setting the switches on the main unit
(1) Set the dip switch SW5-8 to ON. (an external water temperature sensor)
(labeled A in the figure at right)
(2) Set the dip switch SW5-9 to ON. (multiple unit control) (labeled A in the figure
at right)
Refer to "Dip switch settings table" (page 19) for further details.
Make sure the address on the main unit is set to "1" (labeled B in the figure above).
PCB
Sub box
Main unit
Inter-unit wiring
(M-NET line)
SW5-9: ON
Address: 2
PCB
Sub unit
Inter-unit wiring
(M-NET line)
23
Unit
A
LD301
B
SWS2
OFF ON OFF ON
A
B
SWS1
REMOTE
OFF
LOCAL
SW4 SW5
PCB
Sub unit(s)
"n"th unit
SW5-9: ON
Address: 1 + n
Main unit
LD301
SWS2
OFF ON OFF ON
A
B
SWS1
REMOTE
OFF
LOCAL
SW4 SW5
A
SWU1
SWU2
OFF ON OFF ON
SW6 SW7
C
SWU1
SWU2
OFF ON OFF ON
SW6 SW7
B