8
• It is recommended to install a manual shut-off valve (ball valve) on the inlet and outlet of
the water heater to create a convenient shut-off point if future maintenance or servicing is
required.
• Before connecting the pipes to the water heater, it is crucial to flush the lines to eliminate all
the plumbing paste or residue in the lines caused by any welding or soldering.
• It is recommended that all water pipes within 3 feet (1 meter) of the inlet and outlet connections
be rated for high-temperature applications with 150°F (66°C) minimum.
• Before proceeding to the electrical installation, run water through the unit for several minutes
to flush out any air bubbles from the water line..
6. Plumbing Installation
STEP 1:
Thoroughly flush the cold water supply line of all debris.
STEP 2:
Connect the hot water line to the water heater outlet. The water heater outlet is on the
left side of the heater when facing the unit. Connect the cold water line to the water heater inlet,
which is on the right side when facing the unit.
* Pre-hetead water can be connected to the cold water inlet, where this unit will act as booster.
STEP 3:
After tightening both fittings on the water heater, turn on several hot water faucets to
allow water to flow through the water heater for at least 2 to 3 minutes. This process purges all the
air from the water lines and must be performed before turning on the power at the unit.
FAILURE TO PERFORM THIS STEP COULD CAUSE PERMANENT DAMAGE TO THE
HEATING ELEMENTS. (The power to the heater should be turned off and the air purged out of the
lines before turning the power on anytime maintenance is performed on the water heater or the
homes plumbing system, as air might have been introduced into the plumbing pipes.)
STEP 4:
Carefully inspect all connections, units, and the pressure relief device for leaks after the
plumbing installation is completed. If there are no leaks present, you can proceed to the electrical
installation.
CAUTION:
If you detect a water leak from the water heater at this point, turn off the water
supply at the shut off valve on the unit’s incoming water supply and contact service at
1-888-783-6082.
Plumbing Specifications
Minimum water flow to activate the unit
0.5 gpm
Working pressure
0.5–10 bar (7–145 psi)
Tested pressure (maximum)
20 bar (290 psi)
Water connections
3/4” NPT
Summary of Contents for AT-910-18TP
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