Benchmark 2.0ln low nox boiler, Gf-123, Control box connectors – AERCO BMK 2.0 LN Natural Gas (SN G-11-1861 and above) User Manual
Page 158: Input/output box, Appendix h
Appendix H
Benchmark 2.0LN Low NOx Boiler
GF-123
Wiring Schematics
Installation, Operation and Maintenance Manual
OMM-0046_0E
Page 158 of 170
AERCO International Inc.● 100 Oritani Dr. ● Blauvelt, NY 10913. ● Ph: 800-526-0288
PR1 08/20/12
CONTROL BOX CONNECTORS
12
10 11
13 14
16
15
17 18 19
21
20
22 23 24
24-PIN CONNECTOR
241
240
242
243
244
245
251
246
250
247
252
254
253
9
6
8 7
5 4
3
1
2
212
220
221
211
219
16-PIN CONNECTOR
8
5
4
6 7
9
1 2 3
11
16
14
15
13 12
10
226
213
214
216
215
7 6
7
5
3
4
6
1
2
OUT
IN
OUT
IN
IN
OUT
FAULT
RELAY
NOT USED
DELAYED INTLK
EXHAUST TEMP
REMOTE INTLK
N
.O
.
C
4
3
5
1
2
NOT USED
N
.C
.
C
N
.O
.
N
.C
.
RELAY
AUX
12
13
14
11
SENSOR EXCIT
. (
12
VDC
)
BMS
(PWM
) IN
ANALOG IN
OXYGEN SENSOR IN
FLOW SENSOR IN
CO SENSOR IN
+
-
-
+
-
+
-
+
AUX SENSOR IN
SENSOR COMMON IN
-
+
1
OUTDOOR AIR SENSOR IN
9
8
7
5
3
4
2
6
10
IN
GND
4
1
2
1
-
+
2
2
1
3
3
ANALOG OUT
15
16
SHIELD
B
RS
-485
IN
A
1
2
4
3
7
8
6
5
9
10
12
11
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
12
11
10
9
13 14 15
231
234
232
233
238
236
235
237
239
INPUT/OUTPUT BOX
+
-
LS2
LS1
LS4
LS3
J3
J2
J1
ANALOG OUT
+
-
FROM AIR
TEMP SENSOR
TO BLOWER
0-
10
V
AGND
WIRING SCHEMATIC, BMK 2.0 LN CP
120 VAC, 60 Hz
REF: 68023 REV. C (SHT. 2 OF 2)