SL 26-260G3 
SL 40-399G3
SL 40-399G3(Ti)
SL Commercial High Efficiency Condensing Boilers
Suitable for large residential or light commercial applications
Features
Technical Data
Connections
Documentation
Features
Touch Screen Boiler Controller: • Express setup • Remote monitoring & diagnostics • Easy USB programmability • True native BACnet • Intuitive alert system • Simplified load pairing • Visible flame current. |
| · Better efficiency 95% AFUE on the SL 26-260G3 |
| · 96% Thermal efficiency on the SL 40-399G3 |
· Multi-boiler communication up to 9.5 million Btu/h (24 boilers) without additional controls |
· With 24 x 399 boilers turndown ratio is 240:1 = min. firing rate range is 40,000 Btu/h all the way up to 9.5 million Btu/h in 1000 Btu/h increments |
| · PVC/CPVC/PPs approved – venting up to 400 feet |
· Now featuring multiple zone pump control – up to 4 zones. Replacing the need for external pump controls |
· MFZ Technology: Patented moisture management system. Protects and ensures long life for all components in the boiler |
· DDC Control 0-10 VDC or 4-20 mA without additional controls |
· Optional SL 40-399 316Ti Titanium enhanced heat exchanger available |
| · DHW opt out priority for multi boiler systems |
| · Reverse flow detection |
· Up to 10 year commercial heat exchanger warranty |
Technical Data
| SPECIFICATIONS | SL 26-260G3 | SL 40-399G3 SL 40-399G3(Ti) |
| CSA Input (Natural Gas or Propane *) – MBH | 26 – 260 | 40 – 399 |
| CSA Input (Natural Gas or Propane *) – KW | 7.6 – 76.2 | 11.7 – 117 |
| CSA Output – MBH | 24.9 – 239 | 38.4 – 383 |
| CSA Output – KW | 7.31 – 70.0 | 11.2 – 112 |
| Efficiency | 95% (AFUE) | 96% (CE/TE) |
| Min gas pressure (Nat. Gas or Propane) – inch w.c. | 4 | 4 |
| Max gas pressure (Nat. Gas or Propane) – inch w.c. | 14 | 14 |
| Power (120Vac/60Hz) – Watts @ full fire – Watts ( without pumps) | 127 | 190 |
| Weight (empty) – lbs/Kg | 162 / 74 | 240 / 110 |
| Pressure vessel water content – USG/Liters | 4.64 / 17.6 | 6.66 / 25.2 |
| Max boiler flow rate – USgpm | 25 | 45 |
| Min boiler flow rate – USgpm | 6 | 20 |
| Max operating pressure – psig | 30 | 80 |
| Min water pressure – psig | 8 | 8 |
| Approved installation altitude – ASL | 0 – 12,000 ft | 0 – 12,000 ft |
| Ambient temperature – Low (°F/°C) | 32°F / 0°C | 32°F / 0°C |
| Ambient temperature – High (°F/°C) | 122°F / 50°C | 122°F / 50°C |
| Max relative humidity (non-condensing) | 90% | 90% |
| Min water temperature (°F/°C) | 34°F / 1°C | 34°F / 1°C |
| Max water temperature (electronic-limit) (°F/°C) | 190°F / 88°C | 190°F / 88°C |
| Heating surface area – ft² / m² | 22.71 / 2.11 | 36.56 / 3.40 |
| Max ΔT – supply / return (electronic fence) | 40°F | 40°F |
| Maximum equivalent vent length, each side 3” | 200′ | |
| (Natural Gas or Propane) 4” | 200’ | |
| Air intake options: either direct vent or indoor supply |
| MAXIMUM EQUIVALENT VENT LENGTH | ||
| SL 26-260G3 | SL 40-399G3/SL 40-399(Ti) | |
| Sched.40; Rigid PPs | ||
| 3” | 200’ | |
| 4” | 200’ | |
| 90° Vent elbow | allow 8’ equivalent | allow 8’ equivalent |
| 90° Long sweep elbow | allow 5’ equivalent | allow 5’ equivalent |
| 45° Elbow | allow 3’ equivalent | allow 3’ equivalent |
| PPs 87-90° Elbows | use 8’ equivalent | use 8’ equivalent |
| 2” SS Sidewall Terminal | ||
| 3” SS Sidewall Terminal | allow 20’ equiv. of 3” sched. 40 | allow 65’ equivalent |
| 3” CPVC | for each 1’ allow 3.2’ equivalent | |
| Flexible PPs | ||
| 3” Flexible | 60’ (max.) lineal x 3.33 = equiv. | |
| 4” Flexible | 160’ max, using 1.2 x for equiv. length | |
Connections
| PIPING CONNECTIONS SL 26-260G3 / SL 40-399G3 | ||
| A | Exhaust Outlet | 3″ (260) / 4” (399) Schedule 40 |
| B | Combustion Air | 3″ (260) / 4” (399) Schedule 40 |
| C | Relief Valve & Air Vent | 3/4” NPT – F |
| D | Touchscreen Display | 2 1/4” x 4 |
| E | Water Outlet | 1 1/2” NPT – M |
| F | Water inlet | 1 1/2” NPT – M |
| G | Knock-outs (8) | 1/2” |
| H | Gas Inlet | 3/4” NPT – F |
| I | Condensate Outlet | 3/4” Hose |
Documentation
