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
17
and free area are not known, it shall be assumed that
wood louvers will have 25% free area and metal louvers
and grilles will have 75% free area. Non motorized
louvers and grilles shall be xed in the open position.
FRESH AIR OPENINGS FOR CONFINED SPACES
The following instructions shall be used to calculate the
size, number and placement of openings providing fresh
air for combustion, ventilation and dilution in conned
spaces. The illustrations shown in this section of the
manual are a reference for the openings that provide
fresh air into conned spaces only. Do not refer to these
illustrations for the purpose of vent installation. See
Venting (page 19) for complete venting instructions.
OUTDOOR AIR THROUGH TWO OPENINGS
FIGURE 13. FRESH AIR FROM TWO OPENINGS
The conned space shall be provided with two permanent
openings, one commencing within 12 inches (300 mm)
of the top and one commencing within 12 inches (300
mm) of the bottom of the enclosure. The openings shall
communicate directly with the outdoors. See Figure 13 .
Each opening shall have a minimum free area of 1
square inch per 4,000 Btu/hr (550 mm
2
per kW) of the
aggregate input rating of all appliances installed in the
enclosure. Each opening shall not be less than 100
square inches (645 cm
2
).
OUTDOOR AIR THROUGH ONE OPENING
FIGURE 14. FRESH AIR FROM ONE OPENING
Alternatively a single permanent opening, commencing
within 12 inches (300 mm) of the top of the enclosure,
shall be provided. See Figure 14.
The water heater shall have clearances of at least 1 inch
(25 mm) from the sides and back and 6 inches (150 mm)
from the front of the appliance. The opening shall directly
communicate with the outdoors or shall communicate
through a vertical or horizontal duct to the outdoors or
spaces that freely communicate with the outdoors and
shall have a minimum free area of the following:
1. One square inch per 3000 Btu/hr (733 mm
2
per kW)
of the total input rating of all appliances located in the
enclosure, and
2. Not less than the sum of the areas of all vent
connectors in the space.