Hubbell EMV User Manual

OPERATING AND MAINTENANCE MANUAL

FOR PACKAGED ELECTRIC TEPID

WATER HEATING SYSTEM

ELECTRIC HEATER COMPANY

BASE MODEL “ EMV ”

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 7

III SCHEDULED MAINTENANCE AND OPERATION 9

IV TROUBLESHOOTING 12

V SERVICING & REPLACEMENT OF PARTS 13

VI ELEMENT CHARTS 22

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SECTION I - GENERAL DESCRIPTION AND CONSTRUCTION

GENERAL DESCRIPTION

This manual describes a packaged electric water heater system designed to meet the requirements of ANSI
Z358.1-1998 for tepid water delivery to an emergency drench system. The complete assembly consists of the
storage tank, immersion electric heating element(s), thermostat(s), safety relief valve, safety high temperature
cut out, mixing valve, 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

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).

TANK CONNECTIONS

The heater is supplied with separate cold water and tepid water connections. A 1-½ inch FNPT connection is
supplied for the cold water inlet. The cold water is deflected by means of a baffle within the tank. A 1-¼ inch
FNPT union connection is supplied at the mixing valve for tepid water. 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.

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 1­inch long hex head steel bolts and nuts.
See drawing for voltage and power ratings.

CONTROL THERMOSTAT

The water heater is supplied with an immersion thermostat factory
preset at 170°. The immersion thermostat can be adjusted through a
range of 100° - 180° F and is adjustable with a flat tip screwdriver.

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TEMPERATURE HIGH LIMIT SWITCH

As a safety device, a surface mounted high temperature cut-off switch with manual reset is supplied. As an
option, an immersion high temperature cut-off switch with manual reset may be provided. Either high
temperature cut-out switch is factory preset at 190°F. 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

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

MIXING VALVE

The mixing valve is a triple redundant, thermostatic pressure balanced
valve specifically designed for emergency safety shower/face/eyewash
application. The valve is factory mounted and piped to the water heater.
The mixing valve meets OSHA and ANSI requirements and is capable of
providing 85°F output regardless of inlet pressure and temperature
variations, and the temperature setting is tamper proof and can not be
inadvertently adjusted in the field. Alternate mixing valve tepid water set
temperatures of 70°, 75°, 80°, and 90°F are available.

AUTOMATIC AIR VENT VALVE

An automatic air vent valve is supplied in the highest point of the
system to allow trapped air in the system to escape.

DUAL TEMPERRATURE AND PRESSURE GAUGE

A combination temperature (70° - 250° F) and pressure (0 – 200 psi) gauge
with 3-inch dial is installed in the tank.

OUTER SHELL AND INSULATION

The tank is encapsulated in 3-inch thick polyurethane foam insulation. The insulation is protected by a high
impact non-corroding colorized composite protective jacket.

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OPTIONS

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

Low Temperature Alarm Dry Contacts

A low temperature thermostat is available with dry contacts to remotely alarm when the tank water temperature
falls below a specified setpoint. The low temperature thermostat is adjustable from 30-110°F.

High Temperature Alarm Dry Contacts

High temperature alarm dry contacts are available with the optional immersion high limit cut-out switch to
remotely alarm when the tank water temperature rises above the high limit setpoint.
Outdoor Weather Package
The optional outdoor weather package includes a 304 stainless steel outer protective jacket, a weather resistant
electrical housing, and 6” high tank legs to raise the entire unit off the floor.
Flow Alarm
An optional flow alarm may be included to signal that there is tepid water flow.
Explosion Proof Construction
The system may be constructed for installation in a hazardous location.
Mixing Valve Enclosure
An optional fiberglass enclosure provides added protection for the mixing valve in outdoor environments.

Multiple Units

Multiple units may be piped together to meet the needs of larger demand systems.

Alternate Heat Sources

An optional heat exchanger may be factory installed to utilize steam or boiler water as the heating source.

SECTION II – INSTALLATION

WARNING / CAUTION

DO NOT TURN ON THE ELECTRIC POWER SUPPLY to this equipment until heater is completely filled
with water and all air has been released. If the heater is NOT filled with water when the power is turned on,
the heating elements will burn out.

For protection against excessive pressures and temperatures, local codes require the installation of a
temperature-and-pressure (T&P) relief valve certified by a nationally recognized laboratory that maintains
periodic inspection of production of listed equipment of materials, as meeting the requirements for Relief
Valves and Automatic Gas Shutoff for Hot Water Supply Systems. ANSI Z21.22-1971. THE CUSTOMER IS
RESPONSIBLE TO PROTECT PROPERTY AND PERSONNEL FROM HARM WHEN THE VALVE
FUNCTIONS.

All water heaters have a risk of leakage at some unpredictable time. IT IS THE CUSTOMER'S
RESPONSIBILITY TO PROVIDE A CATCH PAN OR OTHER ADEQUATE MEANS, SO THAT THE
RESULTANT FLOW OF WATER WILL NOT DAMAGE PROPERTY.

WATER HEATER PLACEMENT

1. Place the heater on a solid foundation in a clean, dry location nearest to the point of most frequent
tepid water use

2. The water heater should be protected from freezing and waterlines insulated to reduce energy and
water waste.

3. Leave a minimum of 18” clearance for element withdrawal.

4. Do not install in an area where flammable liquids or combustible vapors are present, except when
installed with the explosion proof option.

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