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8.1 - Water heaters
water connections
The water heater comes with the
connections shown in Figures 6-6.
8.2 - Hot and Cold
water piping
The water heater is equipped with ASME
safety P-T relief valves set at 125 PSI
(8,6
bar)
210°F
(99°C)
. However, this water
heater can be equipped with P-T relief
valves set at maximum 160 PSI
(11.2
bar)
210°F
(99°C)
that is the maximum
working pressure - temperature.
CAUTION!!!
All water system
piping must be installed in
accordance with the ANSI/ASME
Boiler and Pressure Vessel Code,
Section IV. All applicable local
codes and ordinances must also
be followed.
CAUTION!!!
Before connecting
the water heater to the system this
last must be thoroughly flushed
to remove sediment, flux, filings
and other foreign matter. The
heat exchanger can be damaged
by build-up or corrosion due to
sediment.
CAUTION!!!
This water heater
can supply water at a temperature
up to 203°F (95°C) (setup of the
safety high limit thermostat) and
pressure of 160 PSI (11,2 bar)
(maximum setup of the relief
valve). If the hot water system
is built with materials not able
to resist to this temperature
and pressure, contractor must
supply and install a device that
will shut-off the appliance before
the system material’s maximum
operating temperature and
pressure are met.
CAUTION!!!
Do not use this
heater to directly heat swimming
pool or spa water.
Low water cutoff device
On a water heater installed above
radiation level, some states and local
codes require a low water cutoff device
at the time of installation.
The low water cutoff terminals are
present within the line voltage junction
box.
The Low water cutoff can be installed
on the 3/4” connection as per figures
3-5 and 3-8, item “42”.
8.2.1 - Near water heater
piping components
Water heater system piping MUST be
sized considering the pressure drops
of the water heater (see Figure 7-1)
and pipings.
Reducing the pipe size can restrict
the flow rate through the water heater,
causing poor system performance.
Basic steps are listed below along
with illustrations on Figures 8-1 and
8-5, which will guide you through the
installation of the water heater.
1. Connect the cold water supply to
the inlet side of the water heater
using the factory supplied items “P”
and “S” of Figure 8-1.
2. Connect the hot water supply to the
outlet side of the water heater using
the factory supplied items “P” and
“S” of Figure 8-1.
3. Install a backflow preventer (field
supplied) on the cold feed make-up
water line.
4. Install a field supplied expansion
tank on the cold water inlet.
Consult the tank manufacturer’s
instruction for specific information
relating to tank installation. Size
the expansion tank for the required
system volume and capacity.
5. Install a drain valve at the lowest
point of the system.
6. Pipe the discharge outlet of any
Pressure and temperature relief
valve following Section 8.2.2.
The temperature and pressure
relief valve is sized to ASME
specifications.
7. Water heater ball valves: Field
supplied. Install ball valves as
shown on figure 8-5. Full port ball
valves are required. Failure to use
full port ball valves could result in
a restricted flow rate through the
water heater.
8. Anti-scald mixing valve: Field
supplied. Install an anti-scald
mixing valve as shown on figure
8-5. An Anti scald mixing valve
is recommended when storing
domestic hot water above 115°F.
9. Unions: Field supplied. Install
Unios as shown on Figure
8-5, recommended for unit
serviceability.
10. Filter: Field supplied. Install a
filter or equivalent multipurpose
strainer at the cold water inlet
connection of the water heater
to remove system particles from
older hydronic systems and protect
newer systems.
NOTICE!
Filter will
be able to stops particles with an
equivalent volume of a spheres with
diameter of 0.04” (1mm).
Install the heater so the gas ignition
system components are protected
from water (dripping, spraying, etc.),
during appliance operation for basic
service or circulator, valves and other
parts replacement.
8 - INSTALLATION - Water connections
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