Unigas HRX2050R, Service Manual

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Building Technologies Installation Guide LMV5... CC1J7550.1en
HVAC Products 16.10.2006
LMV5... basic unit in the control panel, actuator on the burner;
CAN bus cable
«
LMV5...
→
SA
»
> 20 m
Jumper
Max. bus cable length
ACT4 - ACT1: 20 m
AGG5.640 / 641
Max. bus cable length
LMV5...- ACT1: 75 m
AGG5.640 / 641 or
AGG5.630 / 631
Only
CANH
CANL
GND
Max. cable length
of power supply
for actuators 3 m
F T4
AC
1 12 V
X50
RAST3.5
Trafo
X52
Power trafo 1
AGG5.2...
12 V
AC1 12 V
LMV5... basic unit
CANH
F1 T6.3
X10-01
F3 T4
X51
Max. bus cable length
LMV5...-AZL51...: 5 m
AGG5.630 / 631
Control panel
CAN
L
CAN
H
GN
D
Sh
ie
ld
in
g
5
12 V
230 V
12 V
ACT 4
SQM4...
ACT 3
SQM4...
ACT 2
SQM4...
ACT 1
SQM4...
No bus
termination
230 V 12 V
F T2
N
F T4
AC
2 1
2 V
Power supply
max. 3 m AC2 12 V
M
CANL
5 5 5 3
3
X3-04
N
Not used
L
M
7550a04e/0304
L
AC
1 12 V
AC
2 12 V
CAN
L
CAN
H
GN
D
Sh
ie
ld
in
g
Sub-D
connector
Fixed internal
bus termination
AZL5...
F2 T4
Power trafo 2
AGG5.2...
Burner
Bus
termination
No bus
termination
No bus
termination
Total length of CAN bus cable
≤
100 m
Whenever the distance between the LMV5... and the last actuator exceeds 20 m, or if
more than one SQM48 is used on the burner (refer to sizing chart “Determination of
maximum cable length“), a second transformer is required for powering the actuators.
In that case, transformer 1 powers the LMV5... basic unit and the AZL5... display and
operating unit (
Fig. 1
). Transformer 2 powers the actuators (
Fig. 2
).
With the CAN bus cable connections from the LMV5... (
Fig. 1
) to the first actuator (
Fig.
2
), the 2 voltages AC1 and AC2 on the LMV5... side must
not
be connected and only
cables CANH, CANL and M (+shielding) are to be connected to the first actuator (
Fig.
2
).
In that case, the actuators must be powered by a second transformer which to be lo-
cated near the actuators.
The power from that transformer (lines AC1, AC2, M) must be fed to the actuator
(ACT4 in the example above) and then connected through via bus cable AGG5.640
(cable type 1) to all the other actuators.
The fuses required for transformer 1 are accommodated in the LMV5... basic unit.
For transformer 2, these 3 fuses must be located close to the transformer (for type, re-
fer to Basic Documentation P7550).
Example 2
Notes on example 2