John Wood Storage Booster Tanks User Manual

STORAGE BOOSTER TANKS

INSTALLATION AND

OPERATING INSTRUCTIONS

Read these instructions thoroughly before starting

PART NO. 71772 REV. D (09-07)

GSW Water Heating is a division of
A. O. Smith Enterprises Ltd.

WARNING:

If the information in these instructions is
not followed exactly, a fire or explosion
may result causing property damage, per­sonal injury or death.

WARNING:

Improper installation, adjustment, alter­ation, service, or maintenance can cause
injury or property damage. Refer to this
manual. For assistance or additional infor­mation, consult a qualified installer, serv­ice agency, or the electric utility.

FOR YOUR SAFETY

• Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.

• Installation and service must be per­formed by a qualified installer, service
agency or the electric utility.

TABLE OF CONTENTS
I)

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

II) Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

III) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

IV) Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

V) Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

PLEASE RETAIN THESE INSTRUCTIONS IN A
SAFE LOCATION FOR FUTURE REFERENCE

- 2 -

I) INTRODUCTION

Thank you for purchasing this storage booster tank.
Properly installed and maintained, it will provide years of
trouble free service.

The warranty on this storage booster tank is in effect only
when the tank is installed and operated in accordance with
these instructions. The manufacturer of this tank will not be
liable for any injury or property damage resulting from fail­ure to comply with these instructions.

IMPORTANT: Read and understand these instructions
before installing and operating your storage booster tank.

Description

The JOHN WOOD series of storage booster tanks, avail­able in 40, 50 or 80 gallon sizes, have been designed to
supply hot water for domestic use when combined with a
tankless coil boiler or other water heating source. Each tank
is equipped with an adjustable thermostat, pre-wired and
ready for connection to a circulator pump (not supplied).
These tanks are not

constructed to ASME requirements and

should not be used for such applications.

II) SAFETY

Relief Valve Requirements

T&P 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 and letting it snap
shut (see “MAINTENANCE” section).

III) INSTALLATION

Local Codes

The installation of this storage tank must be In accordance
with these Instructions and all applicable local codes.

Location

Locate the storage tank in a clean dry area close to the
water heating source and preferably central to the piping
system. Adequate clearance for accessibility to permit main-

WARNING

For protection against excessive temperatures and pres­sure, install temperature and pressure protective equip­ment required by local codes, but no less than a combi­nation Temperature and Pressure (T&P) Relief Valve cer­tified as meeting the requirements for Relief Valves and

Automatic Gas Shutoff Devices for Hot Water Supply
Systems, ANSI Z21.22, by a nationally recognized test-

ing laboratory that maintains periodic inspection of pro­duction of listed equipment or materials. The valve shall
be marked with a maximum set pressure not to exceed
the maximum working pressure of the storage tank. The
T&P valve shall be rated for the BTU INPUT of the entire
system.This T&P valve may be in addition to any T&P
valve that is required on the boiler, or other energy supply
system. Install the valve into the opening provided on the
storage tank, or other approved system location. Provide
tubing so that any discharge from the valve will exit within
152mm (6 in.) above, or any distance below the structur­al floor and cannot contact any live electrical part. The end
of the relief pipe opening should terminate near the floor
drain or other suitable location. Do not place a valve(s) or
any other blockage or restrictions between the tank and
the T&P valve.

Excessive Weight Hazard
Use two or more people to move and install
storage booster tank. Failure to do so can
result in back or other injury.

WARNING

CAUTION

Hydrogen gas can be produced in a hot water system
served by this storage tank that has not been used for a
long period of time (generally two (2) weeks or more).

Hydrogen gas is extremely flammable and can ignite
when exposed to a spark or flame. To reduce the risk of

injury under these conditions, it is recommended that the
hot water faucet be opened for several minutes at the
kitchen sink before using any electrical appliance con­nected to the hot water system. Use caution in opening
faucets. When hydrogen is present, there will probably be
an unusual sound such as air escaping through the pipe
as the water begins to flow. There should be no smoking
or open flame near the faucet at the time it is open.

IMPORTANT:

This storage booster tank must be installed strictly in
accordance with the instructions enclosed, and local elec­trical, fuel and building codes. It is possible that connec­tions to the tank, or the tank itself, may develop leaks. IT
IS THEREFORE IMPERATIVE that the storage booster
tank be installed so that any leakage of the tank or relat­ed water piping is directed to an adequate drain in such a
manner that it cannot damage the building, furniture, floor
covering, adjacent areas, lower floors of the structure or
other property subject to water damage. This is particular­ly important if the tank is installed in a multi-story building,
on finished flooring or carpeted surfaces. GSW WILL NOT
ASSUME ANY LIABILITY for damage caused by water
leaking from the storage booster tank, pressure relief
valve, or related fittings. Select a location as centralized
within the piping system as possible. In any location
selected, it is recommended that a suitable drain pan be
installed under the storage booster tank. This pan must
limit the water level to a MAXIMUM depth of 45mm (1 3/4
in.) and have a diameter that is a minimum of 50mm (2 in.)
greater than the diameter of the storage booster tank.
Suitable piping shall connect the drain pan to a properly
operating floor drain.

- 3 -

tenance and service must be provided. Water lines and the
storage tank should be protected from freezing tempera­tures. Do not install the storage tank in outdoor unprotected
areas. It is desirable to have a floor drain nearby to permit
easy draining if necessary.

Circulator Pump

A circulator pump is not supplied. Use only a bronze body
model rated for 110/120 volts, 60Hz. Install in accordance
with the pump manufacturer’s instructions using standard
plumbing practices.

Plumbing Connections

The main parts and features of your storage booster tank
are identified in Figure 1. Install plumbing according to
Figure 2 for single storage tank and according to Figure 3
for multiple storage tank systems.

1. Ensure the storage tank is level before starting installa­tion.

2. Install circulation loop as shown using 19mm (¾ in.)
copper pipe.

3. Install the cold water supply piping into a tee between
the circulator discharge and the boiler coil inlet.

4. Connect the boiler supply line to the combination return
and drain valve.

5. Connect hot water supply to top tank fitting.

6. Install 19mm (¾ in.), 150 psi Temperature and Pressure
Relief Valve into the tank as shown.

7. A check valve may be installed between the cold water
tee connection and the circulator. This will force the cold
water through the coil first.

NOTE: The check valve can often be noisy and cause
reduced supply pressures. For multiple storage tank sys-

ACCESS
DOORS

SUPPLY (TO BOILER
TANKLESS COIL)

T&P VALVE (SOME
MODELS WILL HAVE
A SIDE MOUNT FOR
THIS VALVE)

HOT

WATER

OUTLET

ANODE

THERMOSTAT

CONTROL

THERMOSTAT
RETAINER

COMBINATION
RETURN &
DRAIN VALVE

JUNCTION BOX

Figure 2: Single Storage Booster Plumbing Diagram

COMBINATION RETURN

& DRAIN VALVE

STORAGE
BOOSTER

TANK

TANKLESS

COIL BOILER

HOT

T& P VA LVE

(FOR SOME

MODELS)

HOT

T& P VA LVE

CIRCULATOR

PUMP

CHECK VALVE

EXPANSION TANK (OPTIONAL)

PRESSURE

REGULATOR

(OPTIONAL)

COLD

Figure 3: Multiple Storage Booster Plumbing Diagram

COMBINATION RETURN

& DRAIN VALVE

STORAGE
BOOSTER

TANK

STORAGE
BOOSTER

TANK

TANKLESS

COIL BOILER

HOT

T& P VA LVE

(FOR SOME

MODELS)

HOT

HOT

T& P VA LVE

CIRCULATOR

PUMP

CHECK VALVE

EXPANSION TANK (OPTIONAL)

PRESSURE

REGULATOR

(OPTIONAL)

COLD

CHECK

VALV E

T& P VA LVE

IMPORTANT

Do not apply heat directly to tank fittings when making
sweat connections. They contain non-metallic material.

Figure 1: Main Parts and Features

WARNING

The water heating source piping and components con­nected to the tank must be suitable for potable water use.
TOXIC chemicals such as used for boiler treatment must
not be introduced into the tank.