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ES-T-294EXP Submittal Designer__________________________ Contact___________________________ Job ______________________________ Smart Boiler Expansion 294EXP The Smart Boiler Expansion 294EXP expands the Smart Boiler Control 294 in groups of four boilers up to a maximum of sixteen boilers. The 294EXP connects to the Smart Boiler Control 294 through a three-wire communication cable. Front View Side View + Gnd Expansion 1 2 3 Class 2 Circuits Expansion 5 to 8 Set switches: 1 to Off, 2 to Off Boiler Expansion 5 to 8 CAN ICES-3 (A)/NMB-3(A) Boiler 9" (229 mm) For product literature: Pour la documentation du produit: Watts.com/tekmar 6 6 7 7 8 8 Input Power: 115 V (ac) ±10%, 60 Hz, 6 W Relays: 230 V (ac), 5 A, 1/3 hp Operating Temperature: 32°F to 122°F (0°C to 50°C) 5 Boiler 5 + Mod 6 DANGER To Reduce the Risk of Electric Shock - Do not connect to a circuit operating at more than 150 volts to ground. Pour réduire les risques d'électrocution choc - ne pas raccorder à un circuit fonctionnant à plus de 150 V à la terre. Smart Boiler Expansion 294EXP Boiler Mod: Class 2 Circuits 4 5 Use Copper Conductors Only tektra 1152-01 Designed and assembled in Canada H2062B Pump/Valve 5 7 8 9 10 11 Boiler 6 Boiler 7 Boiler 8 + Mod + Mod + Mod 12 13 14 15 16 17 18 19 Boiler 5 Enable Boiler 6 Enable Boiler 7 Enable Boiler 8 Enable 20 21 22 23 24 25 26 27 Boiler 5 Boiler 6 Boiler 7 Boiler 8 Pump/Vlv Pump/Vlv Pump/Vlv Pump/Vlv 28 29 Power L N 8" (203 mm) 211 ⁄ 32" (60 mm) Features Specifications • Expansion for 4 boilers • LED status indicators • 3-wire communication Smart Boiler Expansion 294EXP Literature Submittal, Installation and Operating Manual Packaged weight 2.4 lb. (1100 g) Dimensions 9" H x 8" W x 211⁄ 32" D (229 x 203 x 60 mm) Enclosure Blue ABS plastic, NEMA type 1 Approvals CSA C US, RoHS, Meets Class B: ICES & FCC Part 15 Ambient conditions Indoor use only, 32 to 122°F (0 to 50°C), RH ≤90% non-condensing, Altitude < 6560 feet (2000 m), Installation Category II, Pollution Degree 2 Power supply 115 V (ac) ±10%, 60 Hz, 6 W Relays 230 V (ac), 5A, 1/3 hp Modulating outputs 0-10 V (dc) 500 Ω minimum load impedance or 4-20 mA 1 kΩ max load impedance Warranty Limited 3 Year (See IOM for full warranty) tekmar product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements, please contact tekmar Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on tekmar products previously or subsequently sold. Sample Application Drawing Sample Mechanical diagram 294EXP 294 S1 S4 Boilers 5 to 8 P2 Boilers 1 to 4 B5 V1 B1 P3 S2 BP5 S3 P1 BP1 To 294 Sample Electrical diagram - Legend + Gnd + Gnd Expansion 1 2 Class 2 Circuits 3 Expansion 5 to 8 Set switches: 1 to Off, 2 to Off Boiler Expansion 5 to 8 CAN ICES-3 (A)/NMB-3(A) Boiler For product literature: Pour la documentation du produit: Watts.com/tekmar Pump/Valve 5 5 6 6 7 7 5 6 A1 = Setpoint Load Call B1...B4 = Boiler On-Off Enable 1 to 4 (294) BP1...BP4 = Boiler Pumps 1 to 4 (294) M1...M4 = Boiler Modulation Signal 1 to 4 (294) B5...B8 = Boiler On-Off Enable 5 to 8 (294EXP) BP5...BP8 = Boiler Pumps 5 to 8 (294EXP) M5...M8 = Boiler Modulation Signal 5 to 8 (294EXP) S1 = Outdoor Sensor 070 S2 = Boiler Supply Sensor 082 S3 = Pressure Sensor 088 (Optional) S4 = DHW Sensor 078 P1 = System Pump P2 = DHW Pump P3 = Setpoint Load Pump V1 = Zone Valves Smart Boiler Expansion 294EXP Boiler Mod: Class 2 Circuits Boiler 5 + Mod DANGER To Reduce the Risk of Electric Shock - Do not connect to a circuit operating at more than 150 volts to ground. Pour réduire les risques d'électrocution choc - ne pas raccorder à un circuit fonctionnant à plus de 150 V à la terre. 8 8 4 Input Power: 115 V (ac) ±10%, 60 Hz, 6 W Relays: 230 V (ac), 5 A, 1/3 hp Operating Temperature: 32°F to 122°F (0°C to 50°C) Use Copper Conductors Only tektra 1152-01 Designed and assembled in Canada H2062B A1 7 8 9 10 11 Boiler 6 Boiler 7 Boiler 8 + Mod + Mod + Mod 12 13 14 15 16 17 18 19 Boiler 5 Enable Boiler 6 Enable Boiler 7 Enable Boiler 8 Enable 20 21 22 23 24 25 26 27 28 29 Boiler 5 Boiler 6 Boiler 7 Boiler 8 Pump/Vlv Pump/Vlv Pump/Vlv Pump/Vlv Power L N NOTICE + - + - + - + - M5 M6 M7 M8 T T T T T T L N G T T B5 B6 B7 B8 L N L N G BP5 G BP7 L N BP6 G L N G The information contained herein is not intended to replace the full product installation and safety information available or the experience of a trained product installer. You are required to thoroughly read all installation instructions and product safety information before beginning the installation of this product. BP8 Tel: 1-800-438-3903 • F: (250) 984-0815 tekmarControls.com ES-T-294EXP 2214 © 2022 tekmar