Additional Components; Removing The Existing Domestic Water Heating System; Water Quality; Piping - Baxi H2O 40 GL Manuel D'installation, D'utilisation Et D'entretien

9. Additional Components

• Shut-off valves: Allows isolation of the water heater from boiler system during service.
• Unions: Allows for easy location and removal. Use dielectric unions or couplings to protect hot and cold water fittings from corrosion when connecting
dissimilar materials such as copper and galvanized pipe.
• Vacuum Breaker: Protects the water heater from collapse if a hot tank is shut off to service other components in the system. Required for
Commonwealth of Massachusetts.
• Thermal Expansion Tank: If the water heater is installed in a closed water supply system, such as a system having a back flow preventer in the cold
water supply line, installation of a thermal expansion tank is required.
• Water Hammer Arrester: Dishwashers, clothes washers, and fast-closing positive shutoff valves incorporated in the system all contribute to creating
water hammer. Install a water hammer arrester to prevent damage to pipes and appliances. See water hammer arrester manufacturer's instructions
for application and installation.
• Backflow Preventer: Protects potable water supplies from contamination due to backflow. Requirements for Commonwealth of Massachusetts. Boiler
installation shall conform to the Commonwealth of Massachusetts code 248 CMR which includes but is not limited to: Installation by licensed plumber
or gas fitter.

10. Removing the Existing Domestic Water Heating System

• External Tankless Heaters - Disconnect all lines to the boiler and plug the boiler fittings. Disconnect the external heater from the boiler piping and the
domestic piping systems.
• Internal Tankless Heaters - Disconnect the domestic piping. Do not plug the cold water or the hot water fittings in the internal tankless coil. Leave the
coil in the boiler with cold and hot water fittings open to prevent pressure build-up in the coil.
California installations this water heater must be braced, anchored, or strapped to avoid falling or moving during an
earthquake. See instructions for correct installation procedures. Instructions may be obtained from California Office of the
State Architect.

11. Water Quality

Improper water quality will reduce the expected life of the water heater. Avoid hard water, sediment, high or low PH value, and high levels of chlorides in
the domestic water. Sediment and hard water eventually coat the heating coil inside the water heater and reduce the rate of hot water production and may,
cause a failure. High or low PH and/or chloride concentrations will cause corrosion and eventually failure. A filter is manufacturer recommended where
sediment is present in the water. A water softening system is recommended for areas with hard water. In an area where the water quality is unknown, a
water quality test should be performed.
III. PIPING
1. Piping diagram
All piping instructions and illustrations, presented in this document, are for schematic illustration purposes and focus on how boiler water and DHW flow. Not
all components are shown for the heating system, such as air remover, check valve, automatic feeder, etc.
Pipe lengths (except stated) and orientation of elbows and tees do not have to be exactly the same as shown in the illustrations. Determine the actual
conditions, layout, and space limitation of the installation for layout and pipe lengths.
NOTICE
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PN 615000250 REV. B [01/09/2019]