ATI-540P Installation Manual

33 Page
WATER CONNECTIONS
Do not use this appliance if any part has been under water. Immediately contact a quali-
fied installer or service agency to replace a flooded water heater. Do not attempt to
repair the unit! It must be replaced!
WARNING
Do not reverse the hot outlet and cold inlet connections to the water heater. If you
reverse the connections, the water heater will not activate properly.
NOTICE
All pipes, pipe fittings, valves and other components, including soldering materials, must be suitable for
potable water systems. Also, an automatic air vent or air separator must be installed. This equipment must
be installed according to its manufacturer's instructions.
Installaon
Installaon Manual
1. A manual shutoff valve must be installed on the cold water inlet to the
water heater between the main water supply line and the water heater.
2. In addition, a manual shutoff valve is also recommend-
ed on the hot water outlet and return inlet of the unit.
A thermal expansion tank or code approved device to
handle thermal expansion must be installed.
4. There is a wire mesh filter within the cold inlet and return inlet to trap debris from entering your
heater. This will need to be cleaned periodically to maintain optimum flow. (Refer to p. 63.)
3. 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 the heater.
Cold
inlet
Hot
outlet
Gas inlet
As Close as
Possible
Pressure
relief
valve
Return
inlet
-Installaon with dedicated return line-
Model 540P Indoor 540P Outdoor
Maximum Pipe length*
(Hot Water supply line and
Dedicated Return line)
Pipe
Diameter
3/4"
(19 mm)
500 ft (152.4 m)
1/2"
(13 mm)
200 ft (61.0 m)
*These are equivalent length that includes head loss for elbows, tees, unions, etc. An additional pump may be
necessary for circulation systems with longer equivalent pipe lengths.
Air vent

Air
separator
S
Check valve
Check valve
Y-Strainer
Cold water inlet
Expansion tank
Gas supply
Ball valves
Unions
Hot water outlet Cold water inlet
Gas inlet
Pressure
relief valve
This is a concept drawing only.
Return inlet
 Check valves must be installed on both of the cold water line and return line.
Please refer to the above diagram.
 Insulate the hot water supply line and dedicated return line to prevent heat loss.
NOTICE