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Terminal Block Assignments — High Voltage (TB2) Terminal Block
SC-3000
SC-1500
SC-2000
SC-4000
Terminal
Terminal
Number
Number
25
22
24
21
23
20
22
19
21
18
20
17
19
16
18
15
17
14
16
13
N/A
12
15
11
14
10
13
9
12
8
11
7
10
6
9
5
8
4
7
3
6
2
5
1
4
N/A
3
N/A
2
N/A
1
N/A
Revised: June 2, 2017
Released: June 2, 2017
Label
MASTER ALARM RELAY
MASTER ALARM RELAY
RELAY A
RELAY A
RELAY B
RELAY B
RELAY C
RELAY C
RELAY D
RELAY D
GROUND
GROUND
[120V+] AIR DAMPER
AIR DAMPER INTERLOCK
[120V+] AUXILIARY #1
AUXILIARY INPUT #1
START INTERLOCK #1
START INTERLOCK #1
START INTERLOCK #2
START INTERLOCK #2
GROUND
NEUTRAL
HOT L2
HOT L1
HARSCO Industrial, Patterson-Kelley 2017
All Rights Reserved.
Technical Service 1.877.728.5351
Description
Normally-Open Dry Contact, Close on Alarm
(240VAC Max Voltage & 1/2Amp Max Current)
User-Configurable Normally-Open Dry Contact A
(240VAC Max Voltage & 1/2Amp Max Current)
User-Configurable Normally-Open Dry Contact B
(240VAC Max Voltage & 1/2Amp Max Current)
User-Configurable Normally-Open Dry Contact C
(240VAC Max Voltage & 1/2Amp Max Current)
User-Configurable Normally-Open Dry Contact D
(240VAC Max Voltage & 1/2Amp Max Current)
Ground Terminals for I/O Devices
120VAC Pilot-Duty for Air Damper End Limit Switch
Contact Closure When Air Damper Proven Open
Reserved for Future Use
External Interlock Circuit #1
External Interlock Circuit #2 (In Series w/ #1)
G1 for 208-240VAC, Single phase, 60Hz
N1 for 208-240VAC, Single phase, 60Hz
L2 for 208-240VAC, Single phase, 60Hz
L1 for 208-240VAC, Single phase, 60Hz
1004905978 P-K SONIC NURO Installation and
®
P-K SONIC
Gas Fired Boiler
Owners Manual (Rev F Jun-2017).docx
Page 64
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