HVAC Systems Monitoring Product Line

Conventional Multi-Voltage Relays Accessories

Conventional Detection
D2 D2 D2A
D2 Data Sheet Data Sheet (pdf)
D2 Installation Instructions Installation Instructions (pdf)

2-wire photoelectric low-flow duct smoke detector


D4120A D4120 D4120A
D4120 Data Sheet Data Sheet (pdf)
D4120 Installation Instructions Installation Instructions (pdf)

4-wire photoelectric low-flow duct smoke detector


D4SA D4S D4SA
D4S Data Sheet Data Sheet (pdf)
D4S Installation Instructions Installation Instructions (pdf)

4-wire photoelectric sensor component only


D4P120A D4P120 D4P120A
D4P120 Data Sheet Data Sheet (pdf)
D4P120 Installation Instructions Installation Instructions (pdf)

4-wire photoelectric power board component only


2151A 2D51 2151A
2D51 Data Sheet Data Sheet (pdf)
2D51 Installation Instructions Installation Instructions (pdf)

Photoelectric no-flow/ low-flow smoke detector


2D51 2D51 2D51A
2D51 Data Sheet Data Sheet (pdf)
2D51 Installation Instructions Installation Instructions (pdf)

Replacement photoelectric sensor head for D4120A



Discontinued Products
Discontinued Model Installation Instructions   Replacement Model
DH400ACDCIHTA DH400ACDCIHT Brochure   D4120A
Conventional 4-Wire Ionization High-Temperature Duct Smoke Detector
DH100ACDCIA DH100ACDCI Brochure    
Conventional 4-Wire Ionization Duct Smoke Detector
DH100ACDCLPA DH100ACDCLP Brochure   D4120A
Conventional 4-Wire Photoelectronic Duct Smoke Detector with Low-Flow Technology
DH100LPA DH100LP Brochure   D2A
Conventional 2-Wire Photoelectronic Duct Smoke Detector with Low-Flow Technology