Lochinvar 399 - Product Identification

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Installation and

Service Manual

5

PRODUCT

IDENTIFICATION

FIG. 1 Front and Rear View

Rear View

Front View

Table of Contents

Default Chapter1
- Domestic Water Heaters1
- Table of Contents2
General Product Information3
- Special Instructions3
- Unpacking3
- Codes3
- Warranty3
Safety Information4
Product Identification5
Installation6
- Locating Unit6
- Clearances from Combustible Construction6
- Base for Combustible Floors7
Freeze Protection7
- Pump Operation7
- Location7
- Hydronic System Antifreeze7
- Outdoor Boiler Installation7
- Shutdown and Draining8
Freeze Protection for a Heating Boiler System8
- Combustion and Ventilation Air8
- Combustion Air Filter8
- Combustion Air Options9
- Exhaust Fans11
Venting11
- General Information11
- Venting Support11
- Vertical Vent Termination Clearances and Location11
- Sidewall Vent Termination Clearances and Location12
- Combustion Air Inlet Piping13
- Combined Air Inlet Points15
Vent System Options15
- Barometric Damper Location15
- Conventional Negative Draft Venting16
- 2. Vertical Directaire™ Venting17
- Sidewall Venting19
- Horizontal Directaire ™ Venting21
- Direct Venting22
- Outdoor Installation Venting26
Connecting to Gas Supply28
- Gas Pressure Test28
- Gas Piping28
- Connecting Gas Piping to Unit28
- Gas Train and Controls29
- Combination Gas Valves30
- Venting of Combination Gas Valves30
- Checking Gas Supply Pressure30
- Gas Manifold Pressure Adjustment31
Connecting to Water Supply32
- Inlet and Outlet Connections32
- Relief Valve33
- Water Flow Switch33
- Low Water Cutoff33
Connecting to Electrical Supply33
Boiler System Piping34
- Primary/Secondary Boiler Piping35
- Low Temperature Return Water Systems36
- Radiant Floor and Snow Melt Heating Systems37
- Boiler Flow Rate38
- Boiler Bypass Requirements38
- Temperature/Pressure Gauge38
- Placing the Boiler in Operation38
- Installation with a Chilled Water System39
- Boiler Operating Temperature Control39
Water Treatment40
- Terminal Strip Connection Options40
Operation41
- Lighting Instructions42
- To Turn off Gas to Appliance43
- Programming Temperature Control43
- Quick Programming Overview43
- Adjust Menu Setting Descriptions44
- Access Levels46
- Temperature Control46
- Placement of Sensors46
- Staging Logic47
Hot Surface Ignition System49
Operation and Diagnostic Lights51
Domestic Water Heaters52
- Water Velocity Control52
- Water Chemistry52
- Pipe Size Requirements53
- Circulating Pump53
- Minimum Pump Performance54
- Heat Exchanger54
- Potable Hot Water Temperature Control Settings54
- Location of Cold Water Supply Piping Connections55
- High Water Temperature Limit Control55
- Optional Relief Valve55
- Thermal Expansion55
- Cathodic Protection55
Cleaning and Maintenance56
- Combustion and Ventilation Air57
- Adjusting Differential Air Pressure58
- Servicing Hot Surface Igniter and Ignition Module59
- Ignition System Checkout59
Sequence of Operation59
Troubleshooting Guide62
- 750,000 Btu/Hr Models62
Troubleshooting Guide63
- 2,070,000 Btu/Hr Models63
Wiring Diagram64

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