Lochinvar Knight XL 399 - 800 - Manual (Page 46)

Installation & Operation Manual
46
8
Field wiring
A
U
X. DE
VICE
PILOT
SUP
P
L
Y
24V
A
C
GN
D
A
U
X. DE
VICE
PROVING G
A
S PRES
SURE
SW
IT
C
H
FLO
W
SW
IT
C
H
AL
A
R
M
CO
NT
A
C
TS
R
U
NTIME
CO
NT
A
C
TS
SYSTEM SENSOR DH
W
T
A
N
K
SENSOR OUT
D
OO
R
SENSOR SHIELD GROUN
D
0-
1
0
VDC
E
X
TERN
A
L
GND
CONTROL
D
H
W
THERMOST
AT
R W
ROO
M
THER
MOST
A
T
/
ZONE CONT
ROL
A B SHIELD GROUN
D
SEQUENCING
LOW W A TER
CUTO FF
CN
1
CN
2
CN
3
CN
4
CN
5
C
NO
NC
C
NO
NC
AUX
. DE
VICE
RELA
Y
HIGH GA
S
PRE
SSURE SW
ITCH
(5
00 ONL
Y
)
LO
W
G
A
S
PRESSU
RE SW
ITC
H
(50
0
ON
L
Y
)
FLO
W
SW
ITC
H
T
A
NK THERM
O
ST
A
T
WA
LL
T
H
E
R
M
O
S
T
A
T
/
ZONE CO
NT
ROL
SY
ST
EM SUP
PL
Y
SENSOR
OUTDOO
R S
E
NSOR
BUILDING
MA
NAG
M
E
N
T
SY
STEM
LO
W
W
A
T
E
R
C
U
T
OFF
AUX
. DE
VICE
PROVING SW
ITCH
COM
NO
A
A
B
A B
SH
IE
LD
SH
IE
LD
FR
OM
PREVIOUS
BOILER
TO NEX
T
BOILER
(A
U
X
) D
H
W
T
A
NK SENSOR
Figure 8-3 Low Voltage Field Wiring Connections