Control Communication Links - Lennox Baltic BCK 020 Installation, Operating And Maintenance

control communication links

COMMUNICATION LINKS
Master / Slave
Rooftop can now be connected together (up to 12) via a double shielded pair of wire (0.75mm2 not supplied by Lennox)
and use different running modes, as explained bellow, with no cost increase.
BM 50
SERIAL CARD
LAN
Cable c.sect.(mm2)
3twisted pair
AWG24
500m maxi
6
A
-DT50
B
J14 J15
1 2 3 1 2 3
6 5 4 3 2 1
DC50
DS50
1. DC50
2. DC50 Temperature
3 DC50 Average
4. Master/Slave Temperature
5. Master/Slave Average.
6. Master/Slave Cooling/Heating
7. Back-up
8 Rolling Back-up
_ 1 : DC50 : Master slave mode "total"
The master gives the ventilation order, and its set point to
all other rooftops.
_ 2 : DC50 Temperature : Master slave mode
"temperature"
The master gives the ventilation order and its room
temperature/humidity to all other rooftops, but they have
their own set point.
_ 3 : DC50 Average : Master slave mode "average"
The master gives the ventilation order and the room
temperature/humidity used by all rooftop is the average of
all rooftop. Each rooftop has its own set point.
_ 4 : Master/Slave Temperature : Master slave mode
"temperature"
The master gives its room temperature/humidity to all
other rooftops, but they have their own ventilation order &
set point.
Page 94 - IOM / ROOFTOP BALTIC Series - 0704 - E
BM 50
RT1
J11 J10 SERIAL CARD
Cable c.sect.(mm2)
3twisted pair
AWG24
500m maxi
0 6
C A
-DT50
B
J14 J15
1 2 3 1 2 3
6 5 4 3 2 1
DC50
DS50
MASTER
MASTER
MASTER
STAND ALONE
STAND ALONE
STAND ALONE
All units are stand alone, one unit is waiting for a failure to start
All units are stand alone; one unit is waiting for a failure to start.
This back-up unit changes every Tuesday
BM 50
RT2
J11 J10 SERIAL CARD
Cable c.sect.(mm2)
2twisted pair
AWG24
500m maxi
Cable c.sect.(mm2)
3twisted pair
AWG24
500m maxi
0 6
C A
-DT50
B
J14 J15
1 2 3 1 2 3
6 5 4 3 2 1
DC50
DS50
FAN SET POINT
MASTER
STAND ALONE
STAND ALONE
STAND ALONE
STAND ALONE
STAND ALONE
_ 5 : Master / Slave Average : Master slave mode "ave-
rage"
The room temperature/humidity used by all rooftop is the
average of all rooftop. Each rooftop has its own ventilation
order & set point.
_ 6 : Master / Slave Cooling / Heating : Master slave mode
"cooling/heating"
All rooftop are stand-alone but the slaves have to have the
same running mode as the master (Cooling or heating).
_ 7 : Back-up mode
One rooftop is the back-up unit and will operate if any of the
other rooftop has a failure.
_ 8 : Rolling Back-up mode
Same as above, except the "back-up" unit will be different
each Tuesday. On top of that, the outside temperature/
humidity given to all rooftop can either be the average of
rooftop or be the external humidity/temperature of the
master, making possible the use of a single "weather
station" for the whole site.DS50 Comfort Display / DC50
Service Display
BM 50
RT3
J11 J10 SERIAL CARD
Cable c.sect.(mm2)
3twisted pair
AWG24
500m maxi
0 6
C A
-DT50
B
J14 J15
1 2 3 1 2 3
6 5 4 3 2 1
DC50
DS50
ROOM TEMP
N/A
MASTER
AVERAGE
MASTER
AVERAGE
STAND ALONE
RT12
J11 J10
LAN
0
C
COOLING HEAT MODE
N/A
N/A
N/A
N/A
N/A
MASTER