Piping Installation - John Wood JW6 F307 Installation And Operating Manual

CAUTION
Property Damage Hazard
• Avoid water heater damage.
• Install thermal expansion tank if necessary.
• Do not apply heat to cold-water inlet or hot-water outlet.
• Contact qualified installer or service agency.

Piping Installation

Piping, fittings, and valves should be installed according to
the applicable installation drawing (Figure 6 and Figure 7).
A pressure-reducing valve and/or an expansion tank may be
required for installations where the water pressure is high.
The pressure-reducing valve should be located on the supply
to the entire house in order to maintain equal hot and cold
water pressure.
Important:
•
Do not apply heat to the water fittings on the heater as
they may contain nonmetallic parts. If solder connections
are used, solder the pipe to an adaptor before attaching
the adaptor to the hot and cold water fittings.
•
Some models may contain energy saving heat traps to
prevent the circulation of hot water within the pipes. Do
not remove the inserts within the heat traps.
•
Always use a proper grade of joint compound and be
certain that all fittings are drawn up tight.
1. Install the water piping and fittings as shown in Figure 6 or
Figure 7. Connect the cold water supply to the unmarked
fitting (3/4" NPT). Connect the hot water supply to the fitting
(3/4" NPT) marked "HOT" (or "H").
2. The installation of unions in both the hot and cold water
supply lines is recommended.
3. The manufacturer of this water heater recommends
installing a tempering valve in the domestic hot water line.
These valves reduce the point-of-use water temperature
by mixing cold and hot water. Contact a licensed plumber
or the local plumbing authority.
Note: For water heaters intended for household use, a
thermostatically controlled tempering valve meeting the
requirements of CSA B125 or ASSE 1016 or 1017 should be
used to temper the domestic hot water supply to fixtures to
49°C (120°F).
4. If installing the water heater in a closed water system,
install an expansion tank in the cold water line as specified
under "Closed System/Thermal Expansion".
5. Install a shut-off valve in the cold water inlet line. It
should be located close to the water heater and be easily
accessible. The owner/operator must be shown the
location of this valve and be given instructions on how to
use it to shut off the water to the heater.
Note: Rear and Combination flue heaters are equipped with
a combination cold water inlet/drain valve.
BREECH
CONNECTION
HOT WATER
OUTLET
NIPPLE
T&P VALVE
DRIP TUBE
150 TO 300mm
(6 TO 12")
Figure 6 Plumbing Connections (Center Flue)
Please note the following:
DO NOT install this water heater with iron piping. The system
should be installed only with piping that is suitable for potable
(drinkable) water such as copper, or PEX.
DO NOT use PVC water piping.
DO NOT use any pumps, valves, or fittings that are not
compatible with potable water.
DO NOT use valves that may cause excessive restriction to
water flow. Use full flow ball or gate valves only.
DO NOT use any lead based solder in potable water lines.
Use appropriate tin-antimony or other equivalent material.
DO NOT tamper with the aquastat, burner or temperature
and pressure relief valve. Tampering voids all warranties.
Only qualified service technicians should service these
components.
DO NOT use with piping that has been treated with chromates,
boiler seal, or other chemicals.
DO NOT add any chemicals to the system piping which will
contaminate the potable water supply.
This unit must NEVER be connected to any existing heating
system or component(s) previously used with a non-
potable water heating appliance. All models are suitable for
combination potable water and space heating applications.
– 13 –
COLD WATER
SHUT-OFF
TOP
AQUASTAT
TEMPERATURE
CONTROL
DRAIN
VALVE
CENTER
OF BLAST
TUBE
NON-COMBUSTIBLE
FLOOR