Hubbell E06, E10, E20, E30, E40 Maintenance Manual

OPERATING AND MAINTENANCE MANUAL FOR

COMMERCIAL ELECTRIC WATER HEATER

ELECTRIC HEATER COMPANY

BASE MODEL “ E ”

HUBBELL

ELECTRIC HEATER COMPANY

P.O. BOX 288

STRATFORD, CT 06615

PHONE: [phone]
FAX: [phone]

INTERNET: http://www.hubbellheaters.com/

-- IMPORTANT --

Always reference the full model number and serial number when calling the factory.

WARNING / CAUTION

1. Tank is to be completely filled with water and all air is to be vented before energizing.

2. Due to the rigors of transportation, all connections should be checked for tightness before heater
is placed in operation.

3. Safety relief valve must be installed in tapping provided.

4. The refractory material used in heating elements may absorb some moisture during transit,
periods of storage, or when subjected to a humid environment. This moisture absorption results
in a cold insulation resistance of less than twenty (20) megohms. If this heater has been
subjected to the above condition, each heating element must be checked for insulation
resistance before energizing. A low megohm condition can be corrected by removing the
terminal hardware and baking the element in an oven at 350°F -700°F for several hours or until
the proper megohm reading is obtained.

5. KEEP AWAY FROM LIVE ELECTRICAL CIRCUITS.
Do not perform any maintenance, make any adjustments, or replace any components inside the
control panel with the high voltage power supply turned on. Under certain circumstances,
dangerous potentials may exist even when the power supply is off. To avoid casualties, always
turn the power supply safety switch to off, turn the charge or ground the circuit before
performing any maintenance or adjustment procedure.

6. The unit is designed to operate at pressure not more than 150 psi.

7. Generalized instructions and procedures cannot anticipate all situations. For this reason, only
qualified installers should perform the installations. A qualified installer is a person who has
licensed training and a working knowledge of the applicable codes regulation, tools, equipment,
and methods necessary for safe installation of an electric resistance water heater. If questions
regarding installation arise, check your local plumbing and electrical inspectors for proper
procedures and codes. If you cannot obtain the required information, contact the company.

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TABLE OF CONTENTS

SECTION TITLE PAGE #

I GENERAL DESCRIPTION AND CONSTRUCTION 5

II INSTALLATION 8

III SCHEDULED MAINTENANCE AND OPERATION 10

IV TROUBLESHOOTING 12

V SERVICING & REPLACEMENT OF PARTS 13

VI MISCELLANEOUS CHARTS AND FORMULAS 21

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SECTION I - GENERAL DESCRIPTION AND CONSTRUCTION

GENERAL DESCRIPTION

This book describes a packaged electric water heater that is a stationary, self-contained unit. The
complete assembly consists of the storage tank, immersion electric heating element(s), thermostat(s),
safety relief valve, safety high temperature cut out, and any other required electrical operating control.
Optional equipment may be supplied with your unit. Please consult the product drawing for details
specific to your assembly. The unit is factory assembled, insulated, jacketed, wired, tested, and ready
for electrical and plumbing service connections.

CONSTRUCTION

TANK
Standard Tank Construction:

The standard storage tank is constructed of steel and internally lined with specially formulated
Hydrastone cement to a ½-inch minimum thickness. The tank is designed for a maximum allowable
working pressure of 150 psi (300 psi TP).

Optional Tank Construction:

Optionally, the storage tank may be constructed of all welded solid copper-silicon alloy (ASTM B-96)
or type 316L stainless steel for maximum tank longevity. No internal lining is required due to the non­ferrous materials used in the construction of the pressure vessel. The tank is designed for a maximum
allowable working pressure of 150 psi (300psi TP).

TANK CONNECTIONS

The heater is supplied with separate cold water and hot water connections. Water entering the cold
water inlet is deflected by means of a baffle within the tank. The hot water outlet includes a built in heat
trap to prevent hot water from radiating out from the heater. A ¾-inch FNPT connection is located on
the side of the heater for mounting a combination safety temperature and pressure relief valve. An
overflow line should be utilized from the relief valve outlet to a floor drain. A ¾-inch GHT connection
is supplied for draining. See drawing for locations and sizes.

HEATING ELEMENT

The water heater is supplied with an electric immersion heating element assembly(s), composed of a
copper sheathed element(s) that are brazed into a brass flange. Each assembly is fastened to a
corresponding tank flange using a gasket and four (4) 3/8-16 x 1-inch long hex head steel bolts and
nuts. See drawing for voltage and power ratings.

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CONTROL THERMOSTAT

The water heater is supplied as standard with a surface mounted thermostatic switch that is installed
and wired at the factory. As an option an immersion thermostat is available. See drawing for specific
details. The surface mounted thermostat can be adjusted through a range of 110° - 170° F. The
immersion thermostat can be adjusted through a range of 100° - 190° F. Both thermostats are adjustable
with a flat tip screwdriver.

Surface Mounted Thermostat
(Standard)
Immersion Thermostat
(Optional)

TEMPERATURE HIGH LIMIT SWITCH

As a safety device, a surface mounted high temperature cut-off switch with manual reset, factory set at
190° F, is supplied. As an optional, an immersion high temperature cut-off switch with manual reset,
factory set at 180° F, may be provided. In the event of an over-temperature condition, the thermostat
will disengage the power from the system. The high limit must be manually reset thereafter to restart
the heater.

Manual Reset

Immersion High Temperature Cut-Off Switch
(Optional)
Surface Mounted High
Temperature Cut-Off Switch
(Standard)

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OUTER SHELL AND INSULATION

The tank is encapsulated in 2-inch thick polyurethane foam insulation. The insulation is protected by a
high impact non-corroding colorized composite protective jacket.

OPTIONS

The following optional features may be included in your water heater. Reference included drawing
specific to your heater for further details.

Low Water Cut-Off

Used as a safety device, the electronic low water cut-off is used to detect a low water situation and
disengage the operating coils in the magnetic contactor(s). Once the condition is remedied, the low
water cut-off switch is automatically reset.

Dial Temperature and Pressure Gauge

A combination temperature (70° - 250° F) and pressure (0 – 200 psi) gauge with 2½-inch dial may be
supplied for in-line installation (shipped loose) or factory installed in the tank.

Vacuum Relief Valve

A vacuum relief valve may be provided with the unit to reduce the risk of back siphonage and back
pressure of the system. The valve will be shipped loose for in-line installation. Instructions for
installation are provided with the valve.

Horizontal Constructions

The unit can be designed for horizontal installation, either ceiling hung or base mounted.

Building Management System (BMS)

A Building Management System control package may be supplied for remote operation and alarm
capabilities.

Electro-Mechanical Timer

An electro-mechanical 7-day time clock with battery back-up may be supplied for specific timing
operations. A set of instructions will be supplied with the timer.

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