John Wood Indirect Water Heaters User Manual

PART No. 70884 REV. E (08-05)

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 vapours 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.

INDIRECT WATER HEATER

INSTALLATION AND OPERATING INSTRUCTIONS

Read and understand these instructions thoroughly before starting

TABLE OF CONTENTS

I) Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

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

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

IV) Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

V) Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

PLEASE RETAIN THESE INSTRUCTIONS IN A
SAFE LOCATION FOR FUTURE REFERENCE

IF YOU HAVE ANY INSTALLATION, PERFORMANCE
OR OPERATIONAL QUESTIONS PLEASE CALL THE
FOLLOWING NUMBER, PRIOR TO REMOVING THE
WATER HEATER

(if this is a rental water heater please contact the rental compa­ny)

1-888-GSW-TECH

1-888-479-8324

CAUTION:

The heat transfer medium must be water or
other nontoxic fluid having a toxicity rating
or class of 1, as listed in Clinical Toxicology
of Commercial Products, 5th edition.

The pressure of the heat transfer medium
must be limited to a maximum of 30 PSIG by
an approved safety or relief valve.

– 2 –

I) INTRODUCTION

Thank you for purchasing this water heater. Properly
installed and maintained, it will provide years of trouble free
service.
The warranty on this water heater is in effect only when the
water heater is installed and operated in accordance with
these instructions. The manufacturer of this water heater
will not be liable for any injury or property damage resulting
from failure to comply with these instructions.

Closets without drains and carpeted areas are examples of
unsuitable locations for any water heater. If this heater is to
be installed directly on carpeting, the carpeting must be pro­tected by a metal or wood panel beneath the heater, extend­ing beyond the full width and depth of the heater by a mini­mum 80mm (3 in.). If the heater is installed in a closet or
alcove, the entire floor must be covered by the panel. This
panel must be strong enough to support the weight of the

heater full of water without breaking. Failure to heed this
warning may result in a fire hazard.

II) SAFETY

Relief Valve Requirements

Caution: To reduce the risk of excessive pressures and

temperatures in this water heater, install temperature and
pressure protective equipment required by local codes. It
should be no less than a combination temperature and
pressure relief valve certified by a nationally recognized
testing laboratory that maintains periodic inspection of pro­duction of listed equipment or materials, as meeting the lat­est edition of ANSI Z21.22: Requirements for Relief

Valves and Automatic Gas Shut-off Devices for Hot
Water Supply Systems. This valve must be marked with a

maximum set pressure not to exceed the marked MAXI­MUM working pressure of the water heater (150 PSI). Install
the valve into an opening provided and marked for this pur­pose in the water heater, and orient it or provide tubing so
that any discharge from the valve will exit only within 6 inch­es above, or at any distance below the structural floor and
cannot contact any live electrical part. The discharge open­ing must not be blocked or reduced in size under any cir­cumstances. The end of the relief pipe opening should ter­minate near a floor drain or other suitable location not sub­ject to blocking or freezing. DO NOT thread, plug or cap the
relief pipe opening.

III) INSTALLATION

CAUTION

Hydrogen gas can be produced in a hot water system
served by this heater 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. If 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.

INSTALLATION RECORD

This water heater is protected by a multi-year warranty
against leaks plus a one (1) year warranty on parts. Record
key data here for future reference and prompt service:

Installed By / Purchased From:

Location of Electrical Switch
or Circuit Protector:

Installation Date:

Serial NumberModel Number

Watts

Watts Watts-Total

Volts P.S.I. U.S. Gal.

IMPORTANT:

This water heater must be installed strictly in accordance
with the instructions enclosed, and local electrical, fuel
and building codes. It is possible that connections to the
water heater, or the water heater itself, may develop
leaks. IT IS THEREFORE IMPERATIVE that the water
heater 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 water heater 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 water heater, 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 water heater. 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 water heater. Suitable piping shall
connect the drain pan to a properly operating floor drain.
When used with a fuel-fired heater, this drain pan must not
restrict combustion air flow.

WARNING

If the output of the energy source is more than
100,000 btu/h, the installed temperature-pres­sure relief valve should be replaced with a tem­perature-pressure relief valve having a rated
capacity that is equal to or greater than the out­put of the energy source.

Removal of the installed (or failure to replace)
listed 3/4" temperature-pressure relief valve will
release the manufacturer from any claim which
might result from excessive temperatures and
pressures.

– 3 –

Location

1. Do not locate the heater where water lines could be
subjected to freezing temperatures.

2. It is desirable to have a floor drain nearby to permit easy
draining if necessary.

3. The drain valve and all access panels must be accessi­ble for maintenance and service.

4. Install the water heater so that if there is a leak, the
resulting flow of water will not cause damage to the area
adjoining the water heater. Under no condition is the
manufacturer liable for any water damage in connection
with this water heater.

Plumbing

1. Ensure the heater is level before starting the installa­tion.

2. Install a shut-off valve in the cold water line. This is for
emergency shut-off. It must be kept open during the
heater's operation.

3. A certified relief valve must be installed as shown in
Figure 1.

DO NOT OPERATE THE HEATER WITHOUT A RELIEF
VALVE - SEE NOTE ON RELIEF VALVE.

4. When using copper piping, solder a piece of tubing to a
threaded adaptor before screwing the adaptor to the
tank. Do not apply heat directly to inlet or outlet con­nections.

5. Install a drip tube from the relief valve terminating at
sink or drain.

DO NOT CAP OR THREAD THE END OF A DRIP TUBE ­IT MUST BE UNOBSTRUCTED AND FULL SIZE.

6. The two threaded pipe nipples which are supplied with
the heater should be attached to the "Boiler In" and
"Boiler Out" connections. Connect the "Boiler In" fitting
of the heater to the "supply" fitting of the Boiler and
"Boiler Out" fitting of the heater to "return" fitting of the
Boiler. A suitable circulator pump should be placed
between "Boiler Out" at the heater and "Return" at the
water heater. See Figure 1.

Wiring

1. Remove Access cover on top of the heater.

2. Connect wiring to circulator pump as shown in Figure 2.
A No. 14 AWG Type TEW 105°C wire was installed in
this heater. If wire has to be replaced in the field, use
only type TEW 105°C wire.

3. A ground wire must be run from the ground screw at the
heater junction box to the ground connection at the
service panel.

4. The maximum inductive rating of this circuit is 7.2 F.L.A
120 VAC. Do not exceed this rating.

5. Ensure that wiring conforms to local codes.

Filling

To fill the heater:

1. Open a hot water faucet.

2. Open the cold water supply valve.

3. When water runs out of the hot faucet the tank is filled.

4. Check the system for leaks.

PLEASE REFER TO BOILER MANUFACTURER
INSTRUCTIONS FOR PLUMBING CONNECTION
GUIDELINES.

HOT WATER OUTLET

CIRCULATION PUMP

BOILER OUT

RETURN

BOILER IN

COLD WATER INLET

DRAIN VALVE

DRAIN PAN

SUPPLY

T & P RELIEF VALVE

BOILER

JUNCTION BOX
ELECTRICAL
CONNECTION

Figure 1 Plumbing

ANODE