Connecting The Water Supply; Water Piping - Vesta VH-150 Installation Manual

Connecting the Water Supply

Water Piping

• Before installing the water heater, flush the water line to
remove all debris, and after installation is complete, purge
the air from the line. Failure to do so may cause damage to
Warning
the water heater.
• Do not use lead, PVC, iron or any piping which has been
treated with chromates or other chemicals.
• Do not use this water heater if any part has been immersed
in water. Immediately call a licensed professional to inspect
the water heater and replace any damaged parts.
• Do not reverse the hot outlet and cold inlet connections
to the water heater. This will cause the water heater to not
operate properly.
The water fittings on the water heater are 3/4". If the installation site
has only 1/2" plumbing throughout, it is not necessary to upsize the
water lines to 3/4", if you are installing a single water heater. When
installing multiple water heaters, the number of water heaters and
pipe sizing required will depend on the total hot water demand. For
information about pipe sizing for multiple water heaters, refer to
"Piping sizes" on page 37.
When connecting the water supply, follow these guidelines:
•
Use only pipes, fittings, valves, and other components (such as
solder), that are approved for use in potable water systems.
• Tighten the water heater connection valves with care to avoid
damage.
•
Use unions and manual shut-off valves on the cold water inlet,
DHW outlet, and recirculation water inlet.
• Strive to make the hot water piping system as short as possible,
so as to deliver hot water to the fixtures more quickly and
reduce heat loss.
•
To conserve water and energy, insulate all water piping—
especially the hot and recirculation water lines. Never cover the
drain or pressure relief valve. If the water heater is installed in
a closed water supply system, such as one having a backflow
preventer in the cold water supply line, means shall be provided
to control thermal expansion. Contact the water supplier or
local plumbing inspector for information about how to control
this situation.
• Install a pressure meter on the inlet. If this is not done, local
boiling will occur inside the water heater causing abnormal
sounds and decreasing the durability of the heat exchanger.
•
After installing the water heater, clean the inlet water filter that
is located inside the cold water inlet, and then test the water
heater for proper flow and inspect for leaks. Instruct the water
heater owner that the filter must be cleaned periodically to
maintain proper water flow.
• When all plumbing work is completed, check for leaks and take
corrective action before proceeding.
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Installation Manual
• The following is a water piping example for the water heater:
Hot water
•
The following is a recirculation system piping example for the
water heater (external pump):
Cold water
Hot
water
Ball valve
Union
Pressure relief valve
Expansion tank
Notice
• When using a recirculation mode, by keeping the water in the hot
water supply pipe hot, you can get instant hot water when you turn
the tap on. On the other hand, there will be some minor efficiency
loss, as a result of the water heater maintaining a steady temperature
within the circulation loop, although in many cases, higher gas usage
will be compensated for by lower water usage.
• To use the external pump, connect the external pump and PCB by
using the external pump connector.
• Power consumption of the external pump must be lower than 150W.
Cold water
Ball valve
Union
Circulation pump
Check valve
Faucet