Instructions / Assembly

48
INSTALLATION INSTRUCTIONS
Water Supply
Plumbing
Water Supply Installation
NOTICES:
• Use only Teflon tape on all COLD and HOT water
connections.
• If the water flow resistance of a showerhead is
too high, the burner in the water heater will fail to
ignite. Keep all showerheads clean from debris
that could cause additional pressure drop.
• If using mixing valves on the outlet, choose
one that prevents COLD water pressure from
overcoming HOT water pressure.
• If multiple water heaters are installed in a
manifold system, the water piping MUST be in
“parallel” and the water pressure at each water
heater should be 40 psi (276 kPa).
Install a COLD water shut-off valve near the
inlet line on the water heater. This valve will be
used for servicing and draining purposes.
NOTICE: It is not recommended to
use pipes with smaller diameters than the water
supply connection of the water heater.
Before attaching the water line to the water
heater, open the shut-off valve. Run the water
until it has purged all contaminants (sand,
debris, air, caulking, etc.).
Install a service valve on the end of the COLD
water supply line and connect it to the water
inlet on the water heater.
To ensure proper operation of the water heater,
follow these water pressure guidelines.
• Operation of the water heater requires a
minimum water pressure of 14 psi (97 kPa) and a
minimum water flow rate of 0.4 gpm (1.5 lpm).
• Water pressure of 40 psi (276 kPa) is required to
achieve maximum flow rate.
• To maintain proper performance, there must be
sufficient water supply pressure.
Required Water Pressure =
Min. Operating Water Pressure
(14 psi [97 kPa])
+ Pipe Pressure Loss
+ Faucet Pressure Loss
+ Safety Margin
(more than 5 psi [34 kPa]).
• To supply HOT water to upper floors, additional
water pressure will be required (0.44 psi [3 kPa]
per foot of height). Calculate the distance
between the water inlet of the water heater
(ground level) to the HOT water faucet farthest
away from the water heater (upper floor level).
• Well water systems should be set to ensure a
minimum system pressure of 40 psi (276 kPa).
The pressure should remain constant and stable
during the operation of the water heater.
• Gravity water pressure is not recommended.
When the water is supplied from a water supply
tank, the height of the tank, the diameter of the
supply pipes, and their relation to water pressure
need to be taken into consideration.
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Water Supply Connections (cont.)
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