iN401 - iN501 Water
Connections
28
May
2019
-
Revision
00
8. Water Connections
Note:
For flow rate changes faster than 10 gpm in one
second, a water hammer arrester must be installed to
prevent damage to the water heater.
8.1 Quick Reference Installation Instructions
1. Install the hot water pipe and the pressure relief valve
(furnished with the water heater) as per “8.2 Hot Water
Connection” on page 28.
NOTICE
When tightening any fittings to the connections on the
water heater, care should be exercised not to overtighten
these joints and damage the unit.
2. Install the cold water pipe as per “8.3 Cold Water
Connection” on page 29.
3. Install a condensate drain line as per “8.4 Condensate
Drain Line” on page 29.
4. After installation has been completed, fill and test the
water heater for proper flow and inspect for leaks.
5. Run the hot water for a few minutes and then clean the
inlet water strainer located on the cold water inlet fitting.
This strainer must be cleaned periodically to maintain
proper water flow.
8.2 Hot Water Connection
Install and connect the hot water lines. Keep the hot water
pipes as short as possible to deliver hot water to the fixtures
quickly. If an optional hot water storage tank is required,
connect the hot water lines to this tank also.
Since each installation is different, it is up to the installer to
route the water lines using the most efficient routing. The
drawings shown here are only suggestions indicating the
items needed for the installation.
CAUTION
To prevent adverse health issues, only materials (pipes,
fittings, valves, solder, etc.) that are approved for use
in potable water systems should be used.
1.
Connect a 1-1/2” NPT coupler to the water heater’s hot
water connection.
2.
Install a 1-1/2” union connection.
3.
Install the supplied 3/4” 150 psi maximum pressure relief
valve,
i
nto the port on the
top of
the unit.
4.
Following local building codes, install a 1-1/2” manual
shut-off valve with 1-1/2” NPT fittings.
WARNING
To prevent serious personal injury, do not install any
shut-off device between the water heater and the
pressure relief valve. This valve is designed to release
abnormally high pressure within the water heater in the
event of a system problem.
NOTICE
The pressure relief valve must be rated at 150 psi, the
maximum btu/h output of the unit, and comply with all local
building codes and standards. Do not install any restrictions
or other valves prior to the pressure relief valve.
5. Install and route a discharge pipe from pressure relief
valve to within six inches of the floor and directed away
from walkways or other appliances.
a. Route the relief valve to within six inches of the floor
to prevent injury in the event of a discharge.
b. The diameter of the pipe from the relief valve must be
equal to the outlet size of the relief valve.
c. Do not use reducers in the outlet pipe.
d. Do not install any valves, restrictions, elbows, or other
blockages in the outlet pipe.
e. For multiple unit installations, the outlet piping must
not be connected together. Each pipe must be
separately routed to a suitable drain.
6. Connect the unit to the building’s hot water pipes. If
multiple water heaters are being installed, the diameter of
both the main cold water pipes and the main hot water
pipes need to be sized by an engineering professional.
7. To conserve energy, insulate all hot water pipes and
recirculation pipes.
