User Guide
Table Of Contents
- Safe Installation, Use and Service
- APPROVALS
- General safety INFORMATION
- Introduction
- Installation Considerations
- Installation requirements
- Gas Supply Systems
- Gas Pressure Requirements
- Supply Gas Regulator
- Mixing Valves
- Water Piping
- Temperature-Pressure Relief Valve
- Filling the Water Heater
- Air Requirements
- Unconfined Space
- Confined Space
- Fresh Air Openings For Confined Spaces
- Outdoor Air Through Two Openings
- Outdoor Air Through One Opening
- Outdoor Air Through Two Horizontal Ducts
- Outdoor Air Through Two Vertical Ducts
- Air From Other Indoor Spaces
- Venting
- Gas Piping
- Sediment Traps
- Temperature Regulation
- For Your Information
- Periodic Maintenance
- Venting System Inspection
- Burner Inspection
- Burner Cleaning
- Air Shutter Adjustment
- Housekeeping
- Anode Rod Inspection
- Temperature-Pressure Relief Valve Test
- Periodic Removal of Lime Deposits From Tank Type Commercial Water Heaters
- Deliming Solvents
- Tank Cleanout Procedure
- Deliming Using Flo-Jug Method
- Draining and Flushing
- Service
- Leakage Test Points
- Water Piping Diagrams
- Commercial Water Heater Limited Warranty
20
Draft Hood
Draft Hood
Top of Heater
Screw
Vent to outdoors
or chimney
Screw
Vent
FIGURE 18. DRAFT HOOD ATTACHMENT
The vent pipe from the water heater must be no less
than the diameter of the draft hood outlet on the water
heater and must slope upward at least 1/4 inch per
linear foot (21 mm per meter). See Figure 19 (page
20).
All vent gases must be completely vented to the
outdoors of the structure (dwelling). Install only the draft
hood provided with the new water heater and no other
draft hood.
Vent pipes must be secured at each joint with sheet
metal screws.
FIGURE 19. VENT PIPE MINIMUM UPWARD SLOPE
There must be a minimum of 6” (153 mm) clearance
between single wall vent pipe and any combustible
material. Fill and seal any clearance between single
wall vent pipe and combustible material with mortar
mix, cement, or other noncombustible substance. For
other than single wall, follow vent pipe manufacturer’s
clearance specications. To insure a tight t of the vent
pipe in a brick chimney, seal around the vent pipe with
mortar mix cement.
Failure to have required clearances between vent piping
and combustible material will result in a re hazard.
Be sure vent pipe is properly connected to prevent
escape of dangerous ue gases which could cause
deadly asphyxiation.
Chemical vapor corrosion of the ue and vent system
may occur if air for combustion contains certain chemical
vapors. Spray can propellants, cleaning solvents,
refrigerator and air conditioner refrigerants, swimming
pool chemicals, calcium and sodium chloride, waxes,
bleach and process chemicals are typical compounds
which are potentially corrosive.
GAS PIPING
Contact your local gas service company to ensure
that adequate gas service is available and to review
applicable installation codes for your area.
Size the main gas line in accordance with Table 4 and