Lennox GWB9

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REPAIR PARTS

Model No.

UB90-50

UB90-75

UB90-100





Table of Contents

Default Chapter3
- Table of Contents3
Introduction5
Boiler Ratings & Capacities6
 7
Boilers for Use at High Altitude7
Rules for Safe Installation and Operation9
- Before Installing the Boiler9
Placing the Boiler14
Near Boiler Piping14
- Supply and Return Lines14
- Pressure Relief Valve18
- Expansion Tank and Make-Up Water18
- Condensate Drain Piping21
- Filling Condensate Trap with Water22
- Chilled Water Piping22
Combustion Air and Vent Pipe22
- Connections and Termination22
- Combustion Air and Vent Piping Lengths24
- Installation28
Gas Supply Piping28
- Check Gas Supply28
- Connecting the Gas Piping29
- Checking the Gas Piping29
Electrical Wiring30
- Electric Power Supply30
- Install Your Thermostat31
- Connect Circulator Pump Wiring31
- Electrical Wiring34
Controls and Accessories35
- Integrated Boiler Control (IBC)35
- Gas Control Valve35
- Hot Surface Igniter35
- High Limit Aquastat Control35
- Draft Inducer Temperature Safety Switch35
- Casting Temperature Safety Switch35
- Differential Pressure Air Proving Switch/Blocked Vent Safety Shutoff35
- Draft Inducer36
- Circulator Pump36
- Drain Valve36
- Rated Pressure Relief Valve36
- Blocked Vent Safety Shutoff36
- External Condensate Pump (Optional)36
Water Treatment & Freeze Protection37
- Piping Recommendations37
- Water Chemistry37
- Cleaning the Hydronic System38
- Freeze Protection38
Start up40
- A - Filling Boiler with Water and Purging Air for Systems with Diaphragm Type Expansion Tanks40
- B - Purging Air for Systems with Conventional Closed Type Expansion Tanks40
- C - Placing Boiler in Operation41
Check out Procedure and Adjustment42
- Verify Proper Sequence of Operation42
- Inspect Venting and Air Intake System43
- Inspect Condensate Drain43
- Inspect System Piping43
- Test Ignition System Safety Shutoff Device43
- Test High Limit Control and Adjust44
- Test Other Safety Controls44
- Set Thermostat Heat Anticipator (if Used) and Verify Thermostat Operation44
- Measure the Natural Gas Input Rate44
- Set Thermostat to Desired Room Temperature45
- Review All Instructions45
Maintanance and Cleaning48
- Beginning of each Heating Season48
- Daily During Heating Season48
- Monthly During Heating Season49
- Periodically During Heating Season49
- End of each Heating Season - Annual Shutdown Procedure49
- Annual Examination and Cleaning of Boiler Components49
Detailed Sequence of Operation51
Troubleshooting54
Differential Air Pressure Switch Check62
Repair Parts64

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