Part of the Multi-Staging Controls Series

Ordering Code: 294EXP

UPC: 779655029413

Smart Boiler Expansion, Four tN4, Expands Four Boilers up to 16 Boilers, 3-wire Communication


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  • Expansion for 4 boilers
  • Boiler configuration selected by DIP switches
  • LED status indicators for power, communication, each boiler and pump/valve
  • 3-wire communication
Agency Approvals CSA C US, FCC Part 15B, ICES-003 Class A
Ambient Conditions Indoor use only, 32 to 122 degrees F (0 to 50 degrees C), less than 90 percent RH Non-condensing, Altitude < 6560 feet (2000 m), Installation Category II, Pollution Degree 2
Dimensions 9 IN H x 8 IN W x 2 11/32 IN D (229 x 203 x 60 MM)
Enclosure Material Blue ABS plastic
Enclosure NEMA Rating NEMA 1
Modulating Output 0-10 V (dc) 500 ohms minimum load impedance / 4-20 mA 1 k ohms max load impedance
Power Supply 115 V (ac) plus / minus 10 percent, 60 Hz, 6W
Pump Relay 230 V (ac), 5A, 1/3 hp