25Installing the Water Heater
8. When the water heater reaches its maximum
firing rate, check the inlet gas pressure reading
on the manometer. The gas pressure must fall
within the ranges specified on page 24.
3.4 Connecting the Water Supply
The water fittings on the water heater are
3
/
4
in.
If the installation site only has
1
/
2
in. plumbing
throughout, it is not necessary to upsize the water
lines to
3
/
4
in, 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 "4.6.1 Initially Setting the Multi
Remote Controller System" on page 64.
Note
Using
1
/
2
in. water lines may reduce
the overall flow rate of the system and
overall capability of the water heater.
When connecting the water supply, follow these
guidelines:
●
Do not remove the factory installed recirculation
inlet cap unless a return line is connected to this
fitting. Water leakage will occur if this cap is loose
or missing ("A2" model only).
●
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.
●
We recommend using 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, to deliver hot water to the
fixtures more quickly.
2. Open a hot water faucet. The water heater
should turn on and the gas in the gas supply
line will be purged.
3. Leave the faucet on until the water heater shuts
down due to a lack of gas supply, and then turn
off the hot water faucet.
4. Remove the water heater front cover by
loosening the 4Phillips head screws securing it
to the case.
5. Loosen the screw indicated in the figure below
and connect a manometer to the pressure port.
Reset the manometer to zero before use.
Digital Pressure
Manometer
6. Re-open the manual gas valve and check for
leaks.
7. Open multiple fixtures that have high flow rates,
such as bathtub and shower faucets, to ramp
the water heater up to its maximum firing rate.
To Next Page
Loading...
Need help?
General
