John Wood Commercial Storage Tanks 80G - 120G - Manual (Page 3)

Locate the storage tank in a clean and dry area close to the
water heating source and preferably central to the piping
system (this is to help prevent heat loss through the pipes).
Locate the unit such that controls, hand-hole cleanout, drain
valve, and plumbing are easily accessible to permit future
service and maintenance. Ensure that the unit is level on the
floor.
Locate and install the unit near a floor drain and in an area
where leakage of the tank or water piping will not result in
damaging adjacent areas or lower floors of the premises.
INSTALLATION INSTRUCTIONS
2. Peel back or cut if required, the insulation covering the
clean-out flange.
3. Remove the six hex head screws securing the tank
clean-out plate and proceed to remove the plate and
gasket.
4. Remove lime, scale, or sediment, taking care not to
damage the glass lining of the tank.
To re-assemble the hand hole clean-out:
1. Inspect the clean-out gasket. If it shows signs of wear, a
new gasket is required.
2. Next, install the clean-out plate. Be sure to draw the
plate up tight by tightening the screws securely in a cross
pattern.
3. Position the fiberglass insulation, and install the casing
door.
Relief Valve Check
Inspect the relief valve annually to ensure proper operation.
This involves opening the valve to check that it is flowing
freely and that there are no blockages. Provide a bucket or
drainage for the expelled water. Lift the lever and let it snap
shut. The water should stop instantly.
WARNING:
WATER WILL BE HOT and water flow can
be forceful. If the valve does not function properly, it must be
replaced.
In systems where the relief valve discharges periodically, this
may be due to thermal expansion or to a thermostat that is
operating at too high a temperature. In a closed water
system, an expansion tank may be required. Contact your
local plumbing inspector. For a malfunctioning aquastat,
contact your local gas supplier or electric utility.
Where such a location is not available, it is strongly
recommended that a suitable drain pan must be installed
under this unit. This pan shall be 1 ½ “ (40 mm) deep with a
diameter of minimum 2” (50 mm) larger than the diameter of
the storage tank. A suitable pipe properly connected to an
adjacent floor drain shall be provided
(See Figure 1).
WARNING:
Do not install directly on carpet. Instead,
place the unit on a metal or wood panel extending a minimum
of 3” (75 mm) from all sides.
NOTE: THE FITTINGS SUPPLIED WITH THIS HOT
WATER STORAGE TANK ARE 2” NPT.
1. Close main water supply and drain the piping system
when the hot water storage tank is to be connected.
2. When attaching solder “sweat” fittings, DO NOT APPLY
HEAT DIRECTLY TO THE WATER HEATER NIPPLES
as the plastic liners in the nipples will be damaged.
Sweat adapters to the first section of the water piping
before threading onto the unit.
3. Install a manual shut-off valve in the water supply line. It
is good plumbing practice to include unions at the
connections.
4. IMPORTANT: Before putting the unit into service, make
sure that a properly rated and sized temperature and
pressure relief valve is installed in the designated fitting.
The relief pressure marked on the relief valve must not
exceed that stated on the rating plate of the hot water
storage tank.
5. IMPORTANT: The relief valve must be connected to a
discharge or drain pipe no smaller in size than the outlet
of the relief valve. This pipe must not be valved,
plugged, allowed to freeze, or be restricted in any way.
Terminate close to a drain of adequate capacity. The
relief valve is necessary to avoid excessive water
pressure or water temperature from developing. Such a
condition could cause serious personal injury due to
scalding or serious physical damage to the unit. This
safety device must be checked annually for proper
operation.
WATER PIPE PLUMBING CONNECTIONS
6. With water piping installed, check that a hot water faucet
served by the storage tank is open and that the unit's
drain valve is closed. Open the supply valve and fill the
unit and piping system with water. When an
uninterrupted stream of water flows from the faucet, the
system is full. Close the faucet. Check for piping and
connections for leaks, and repair as necessary.
7. Connect a hose to the drain valve and connect to a drain.
Open drain and let water run until clear to flush out any
foreign matter that may have entered the system. Once
flushed, close the drain valve and disconnect the hose.
8. For multiple storage tank systems, check valves must be
installed to prevent circulator from pumping hot water
into another tank and overheating it.
NOTE: Check Valves can often be noisy and cause reduced
supply pressures.
9. The use of a pressure regulator is optional, but
recommended when the cold supply pressure is over 80
psi. Reducing the inlet pressure to 45-60 psi will reduce
probability of relief valve discharge due to thermal
expansion.
NOTE: Under certain conditions, water in the storage tank
unit could become excessively hot. It is recommended that a
thermostatically controlled tempering valve be installed in
the outlet line to reduce the risk of scald injury. This valve
o prevents water in excess of 140 Fahrenheit from reaching
the outlets (point of use).