Lennox International Inc. GWB9-100IH-2 用户手册

• This appliance is a gas-fi red direct vent hot water boiler 

with cast aluminum boiler sections. 

• The heating system water absorbs large amounts of 

heat from the cast aluminum heat exchanger, cooling 

fl ue gases and causing condensation. 

• Sealed combustion, premix gas burner, and low fl ame 

temperature means reduced CO and NOx emissions, 

which contribute to cleaner and healthier environment.

• This appliance takes its combustion air directly from 

outdoors (sealed combustion) and does not compete 

with building occupants for fresh air. 

• Sealed combustion (also known as “direct vent”) 

is safest and best way to obtain plenty of clean 

combustion air. 

Dimensions ....................................................................................................................2
Introduction ...................................................................................................................3
Important Safety Information ...........................................................................................4
Boiler Ratings & Capacities ..............................................................................................5
Boilers For Use At High Altitude ........................................................................................5
Before Installing The Boiler ..............................................................................................8
Boiler Installation ...........................................................................................................9
Near Boiler Piping ......................................................................................................... 11
Combustion Air And Vent Pipe ........................................................................................ 22
Gas Supply Piping ......................................................................................................... 28
Electrical Wiring ........................................................................................................... 30
Controls And Accessories ............................................................................................... 35
Start Up ...................................................................................................................... 37
Operating Instructions ................................................................................................... 38
S9381a Integrated Boiler Control Operation And Adjustments ............................................. 39
Maintenance And Cleaning ............................................................................................. 45
Troubleshooting ............................................................................................................ 47
Differential Air Pressure Switch Check ............................................................................. 49
Appendix A - Water Quality, Water Treatment And Freeze Protection .................................... 50
Installation And Check-Out Certifi cate ............................................................................. 54

• Induced draft fan draws in outside combustion air, 

takes cooler fl ue gases from boiler unit and provides 

positive removal of fl ue gases from the building 

through readily available PVC and CPVC pipes.

• These low pressure gas-fi red hot water boilers are 

design certifi ed by CSA International for use with 

natural gas and propane gases (90-100 model is 

certifi ed for natural gas only). 

• Boilers are constructed and hydrostatically tested 

for maximum working pressure of 50 psig (pounds 

per square inch gage) in accordance with A.S.M.E. 

(American Society of Mechanical Engineers) Boiler and 

Pressure Vessel Code Section IV Standards for heating 

boilers.