Lennox International Inc Gas-Fired Hot Water Boiler, GWB9-075IH-2, GWB9-100IH-2 Introduction

INTRODUCTION
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 Certificate	54

Introduction

•This appliance is a gas-fired 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 flue gases and causing condensation.

•Sealed combustion, premix gas burner, and low flame 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.

•Induced draft fan draws in outside combustion air, takes cooler flue gases from boiler unit and provides positive removal of flue gases from the building through readily available PVC and CPVC pipes.

•These low pressure gas-fired hot water boilers are design certified by CSA International for use with natural gas and propane gases (90-100 model is certified 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.

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