Lochinvar Sunc Condensing Boiler 1.3 - Manual (Page 41)

41
Installation & Operation Manual
7
Field wiring
(continued)
1
ALARM
LBL20052 RE
V B
30 SHIELD GND
MOD BUS
0 -
10V
INP
U
T
2
C
O
N
TA
CT
S
3
RUN
T
IME
4
CO
N
TA
CT
S
5
LO
UVER
6
PROV
ING
8
FL
O
W
SW
IT
CH
10 FL
OW SW
IT
CH
29 A 26 SEN
SOR
25 T
ANK
24 SEN
SOR
23 O
UT
DOOR
22 SENSOR 21
SY
STE
M
20
(-)
19
(+
)
18
SHIELD GND
17 B 16 A 15 SHIELD GND 14 W 13 R 11
TA
NK
12 THERMOST
AT
28 B 27 S
H
IELD GND
CASCADE
ENABLE
A B
A B
A B
BU
IL
D
ING
MA
N
AGEM
EN
T
SY
STEM
LOUVER PROVIN
G
SWIT
CH
TANK THER
MOST
AT
ENABLING DEVICE
SY
STEM S
EN
SOR
OUTDOOR SE
N
SOR
TANK S
EN
SOR
SHIEL
D
SHIEL
D
FRO
M
PRE
VIOUS BOILER
TO
NEX
T BOILER
SHIEL
D
HEA
T
EX
CHANGER 2
FL
OW SWIT
CH
HEA
T
EX
CHANGER 1
FL
OW SWIT
CH
A B
SHIEL
D
MODB
U
S
COM
M
U
N
IC
A
TION BU
S
TO
NE
XT
BOILER
9
HEX 1
7
H
EX
2
Figure 7-3 Low Voltage Field Wiring Connections