39
Note:
Oil temperature too low protection
See BM1-3 (BM1 introduction table).
Electric wiring and the application
Identification:
• Master unit: by setting DIP switch, the unit number is 0. It is used to communicate with indoor
unit, and it is the organizer of outdoor communications as communication master unit.
• Slave unit: by setting DIP switch, the unit number is not 0.
• DIP switch definition:
BM1 is usually set by the personnel on site; BM2, BM3, BM4 are pre-set in the factory.
BM1_1: Master outdoor unit searches the total outdoor units after powered on at first time.
The quantity of total outdoor units is floating from right to left on LED. "1=0" is one outdoor
unit, "2=01" is two outdoor units, "3=012" is three outdoor units.
BM1_2: Master outdoor unit searches the total indoor units after powered on at first time. The
quantity of total indoor units is floating from right to left on LED. "-04-" is 4 indoor units, "-06-"
is 6 indoor units, "-15-" is 15 indoor units.
BM1_3: The setting is 0 or 1. Default is 0. Once powered off, unit software shall reset to "OFF"
automatically ignoring BM1_3 setting.
BM1 introduction
BM1-1 Outdoor searching after
startup
0
Begin to search outdoor
1
Stop searching outdoor and lock the quantity
BM1-2 Indoor searching after
startup
0
Begin to search indoor
1
Stop searching indoor and lock the quantity
BM1-3 Start
up
Power on, no action
Default condition: Unit shall startup after 6
hours preheat or oil superheat above 20°C. (Oil
Superheat=Oil temperature of compressor sink-
Refrigerant saturation temperature of ambient)
Power on, change 0 to 1 or
change from 1 to 0 then to 1
Unit shall startup after 6 hours preheating or oil
superheat above 15°C
.
BM1-4 Range of Water Temp.
Setting
0
Inlet water< 5°C, running forbidden
1
Inlet water < 5°C or >45°C, running forbidden
BM1-5 Over match setting
0
Indoor capacity divisity >130%, system functions
normally
1
Indoor capacity>130%, system alarms
BM1-6
Communication protocol
selection between indoor
and outdoor unit
0
New protocol
1
Old protocol
BM1-7
BM1-8 Address setting
BM1-7
BM1-8
unit number
0
0
0# (physical master unit)
0
1
1#
1
0
2#
1
1
3#
