John Wood Commercial Electric Water Heater - Manual (Page 7)

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Important: Heat must not be applied to the water fittings
on the heater as they may contain nonmetallic parts. If sol-
der connections are used, solder the pipe to the adaptor
before attaching the adaptor to the hot and cold water fit-
tings.
Important: Always use a good grade of joint compound
that is compatible with potable water and be certain that all
fittings are drawn up tight.
1. Install the water piping and fittings as shown in Figure 4.
Connect the cold water supply (1 1/2 in. NPT) to the fit-
ting marked “Cold Water Inlet”. Connect the hot water
supply (1 1/2 in. NPT) to the fitting marked “Hot Water
Outlet”.
Important: Arrow on inlet fitting should remain at the
12 o’clock position.
2. The installation of unions in both the hot and cold water
supply lines is recommended for ease of removing the
water heater for service or replacement.
3. The manufacturer of this water heater recommends
installing a tempering valve in the domestic hot water
line as shown in Figure 4. These valves reduce the point-
of-use temperature of the water by mixing cold and hot
water and are readily available for use. Contact a
licensed plumber or the local plumbing supplier.
4. If installing the water heater in a closed water system,
install an expansion tank in the cold water line as speci-
fied 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 eas-
ily accessible. Show the user the location of this valve
and how use it to shut off the water to the heater.
6. A temperature and pressure relief valve is installed in the
opening marked ”Temperature and Pressure (T&P)
Relief Valve” on the water heater. Add a discharge line to
the opening of the T&P relief valve. Follow the instruc-
tions under “Temperature and Pressure (T&P) Relief
Valve”.
7. After piping has been properly connected to the water
heater, close the shut-off valve in the cold water inlet
line.
Please note the following:
DO NOT install this water heater with iron piping. The sys-
tem should be installed only with piping that is suitable for
potable (drinkable) water such as copper, CPVC, or poly-
butylene. 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 50/50 tin-lead solder (or any lead based sol-
der) in potable water lines. Use 95/5 tin-antimony or other
equivalent material.
DO NOT tamper with the 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 chro-
mates, boiler seal, or other chemicals.
DO NOT add any chemicals to the system piping that will
contaminate the potable water supply.
DO NOT apply electrical power before the tank is filled with
water and you have confirmed that there are no leaks in the
piping and connections.
Electrical Connections
CAUTION! TO PREVENT DAMAGE TO THE TANK AND
HEATING ELEMENT(S), THE TANK MUST BE FILLED
WITH WATER BEFORE TURNING "ON" POWER. SEE
"FILLING THE WATER HEATER".
The information in Table 3 may be used as a guide to deter-
mine the wire size of the branch circuit. It is recommended
the branch circuit wiring be 125% of the amperage rating of
FIGURE 4: Piping Installation
Water meter or
anti-siphoning
device
Tempering valve
TO REDUCE RISK OF ELECTRIC SHOCK OR POSSI-
BLE ELECTROCUTION THE WATER HEATER MUST
BE ELECTRICALLY GROUNDED. The electrical supply
to the water heater should be a separately grounded
branch circuit having overcurrent protection and a discon-
nect switch. Refer to the rating plate attached to the
heater to determine the correct ratings for voltage and
amperage. To ensure proper operation, the supply voltage
should be within +5% and -10% of the rated voltage of the
heater. The water heater should be grounded in accor-
dance with national and local codes.
WARNING
WATER HEATER EQUIPPED FOR LIMITED VOLTAGE
RANGE. This water heater is designed to operate within a
specific voltage range. Check rating plate mounted on the
heater for the correct voltage. DO NOT connect this water
heater to any voltage supply other than that indicated on
the rating plate. Failure to use the correct voltage may
result in unsafe operation and personal injury or property
damage. If you have any questions or doubts consult your
electric company.
WARNING