P-K Storm
TM
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: June 26, 2020
Released: June 26, 2020
©
Patterson-Kelley 2020
All Rights Reserved.
2691000273 P-K Storm ST2500-ST4000
Installation and Owners Manual Rev A.docx
Page 67
Terminal Block Assignments
— High Voltage (TB2) Terminal Block
STORM
Label
Description
22
MASTER ALARM RELAY
Normally-Open Dry Contact, Close on Alarm
(240VAC Max Voltage & 1/2Amp Max Current)
21
MASTER ALARM RELAY
20
RELAY A
User-Configurable Normally-Open Dry Contact A
(240VAC Max Voltage & 1/2Amp Max Current)
19
RELAY A
18
RELAY B
User-Configurable Normally-Open Dry Contact B
(240VAC Max Voltage & 1/2Amp Max Current)
17
RELAY B
16
RELAY C
User-Configurable Normally-Open Dry Contact C
(240VAC Max Voltage & 1/2Amp Max Current)
15
RELAY C
14
RELAY D
User-Configurable Normally-Open Dry Contact D
(240VAC Max Voltage & 1/2Amp Max Current)
13
RELAY D
12
GROUND
Ground Terminals for I/O Devices
11
GROUND
10
[120V+] AIR DAMPER
120VAC Pilot-Duty for Air Damper End Limit Switch
Contact Closure When Air Damper Proven Open
9
AIR DAMPER INTERLOCK
8
[120V+] AUXILIARY #1
Reserved for Future Use
7
AUXILIARY INPUT #1
6
5
4
START INTERLOCK #1
External Interlock Circuit #1
3
START INTERLOCK #1
2
START INTERLOCK #2
External Interlock Circuit #2 (In Series w/ #1)
1
START INTERLOCK #2