Hubbell EMV Operating instructions

OPERATING AND MAINTENANCE MANUAL
FOR PACKAGED ELECTRIC TEPID
WATER HEATING SYSTEM
ELECTRIC HEATER COMPANY
BASE MODEL “ EMV ”

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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 terminalhardware 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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SECTION TITLE PAGE No.
I GENERAL DESCRIPTION AND CONSTRUCTION 4
II INSTALLATION AND START-UP 6
III SCHEDULED MAINTENANCE AND OPERATION 8
IV TROUBLESHOOTING 10
V SERVICING AND REPLACEMENT OF PARTS 11
VI ELEMENT CHARTS 19

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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 1-inch 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.
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.
ManualReset
Surface Mounted High Immersion High
Temp. Cut-Off Switch Temp. Cut-Off Switch
(Standard) (Optional)

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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.
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.

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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.
PIPING INSTALLATION
NOTE: The most effective means for preventing deterioration from accelerated corrosion
due to galvanic and stray current is the installation of dielectric fittings/unions. The
installation of these fittings is the responsibility of the installing contractor.
1. Connect the cold water inlet and tepid water outlet to the appropriate connections as
shown below; refer to the drawing for location and sizes.
2. Install the combination temperature and pressure safety relief valve in the tapping
provided. Note that this is required by law for safety considerations.
Install into provided tapping Manual Release Lever
Temperature Probe
Outlet to floor drain
Temperature and Pressure Relief Valve
3. Install a relief valve overflow pipe to a nearby floor drain. CAUTION: No valve of
any type should be installed between the relief valve and tank or in the drain line.
4. On startup, thermal expansion will cause the water to expand. Hubbell recommends
that a thermal expansion tank or supplementary pressure relief device be installed in
the hot water outlet to allow for this expansion.

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FILLING THE HEATER
1. Completely close the drain valve.
2. Open the highest tepid water outlet to allow all air to escape from piping.
3. The black plastic knob on the air vent valve must be opened two turns to allow air to
escape from the system.
4. Open the valve to the cold water inlet and allow the heater and piping system to
completely fill, as indicated by a steady flow of water from the open outlet.
ELECTRICAL INSTALLATION
1. Enter junction box with properly sized feeder leads.
2. Connect these power leads to wires enclosed in junction box with wire nuts.
3. All other electrical connections are made at the factory; therefore, no other electrical
connections are necessary.
FINAL CHECKS
1. Check all connections for tightness.
2. Ensure that all the above steps are completed.
3. After the water is heated for the first time, monitor the water temperature as described
in Section III, Quarterly Inspection.
RECIRCULATION PACKAGE
A recirculation loop can be used to provide tepid water at the emergency fixtures for
applications where the water heater is a great distance away. This loop usually continuously
recirculates the water via a small pump that returns the water to the heater. The water
returned from the loop feeds back into the packaged water heater system. Therefore, the
loop is continuously maintained at the mixing valve temperature thus assuring proper
temperature water at the fixtures.

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SECTION III -SCHEDULED MAINTENANCE AND OPERATION
WARNING / CAUTION
Before performing any maintenance procedure, make certain power supply is OFF and
cannot accidentally be turned on.
MAINTENANCE AND OPERATION
The water heater is automatic in its operation. It will maintain a full tank of water at the
temperature setting of the thermostat. The water heater should not be turned on without first
making sure that the tank is full of water and that all air has been released.
FREEZING
The tank should be fully drained in the event the electricity has been turned off and if there
is danger of freezing.
MONTHLY INSPECTION – MIXING VALVE
NOTE: The mixing valve should be tested in conjunction with regular OSHA required
shower/eyewash testing. These tests confirm that the equipment is safe and operational and
also serve to purge potential bacteria laden water from the system.
1. Monitor temperature
a. Record all information on the Mixing Valve Inspection and Test Log, see page 11.
b. Using an accurate thermometer, turn on the shower/eyewash and record the maximum
start-up spike temperature of the water.
c. After a few minutes of running, record the normal temperature.
d. If the temperature does not match required temperature (±3°F), recalibrate the mixing
valve. See Section V, Service and Replacement of Parts, Re-Calibrate Mixing Valve.
2. Monitor flow rate
a. OHSA/ANSI recommends a potable water system maintain a pressure of 30-psig
minimum with a flow rate of 20-GPM minimum to a shower head and 3-GPM minimum
to an eye/face wash fixture.
b. One simple method of testing is to collect the water in a 5-gallon container. At the
required flow rate, the shower head will fill the container in approximately 15 seconds
and the eye/face wash will fill the container in approximately 15 seconds.
QUARTERLY INSPECTION
1. Monitor thermostat
a. Let water heater completely heat to a designated thermostat setting.
b. After thermostat satisfies (that is, when the thermostat actually clicks off), draw water
from the relief valve.
c. Compare water temperature of drawn water to the temperature setting of the
thermostat when it satisfies. Normal variation between the two points is approximately
+7°F.
d. If these two readings do not coincide within acceptable tolerances and verification has
been made of the accuracy of the temperature-reading gauge, replace the thermostat.
2. Lift test lever on relief valve and let water run through valve for a period of
approximately 10 seconds. This will help flush away any sediment that might build up in
water passageways.
3. Inspect element flange for leakage as follows:
a. Shut off Power Supply.
b. Remove element housing cover.
c. Visually inspect heating element gasket for evidence of leaks.
d. Rub finger around gasket that is between the heating element and tank flange for any
evidence of moisture. If moisture is present or a water drip is observed, follow
procedure outlined in Section V.
4. Check for loose electrical connections. Tighten as necessary.

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ANNUAL INSPECTION
1. Flush tank as follows
a. Shut off power supply.
b. Close valve on hot water outlet piping.
c. Open valve on drain piping.
d. Cold water inlet line pressure will be strong enough to flush sediment from the bottom
of the tank out through the drain. Let water run for 3-4 minutes.
e. Close drain valve.
f. Open hot water valve.
g. Turn power supply ON.
MIXING VALVE INSPECTION AND TEST LOG
COMPANY:
HEATERSERIALNUMBER:
DATE START-UP
SPIKE OUTPUT TEMPERATURE COMMENTS TESTED BY

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SECTION IV –TROUBLESHOOTING
Symptom Probable Cause Corrective Action / Remedy
No hot water in
tank Circuit breaker tripped at source. Reset circuit breaker.
High limit switch tripped. Reset high limit switch.
Loose wires. Torque screws holding wires.
Heating element inoperable. Check heating element operation by
clamping an Amprobe around each
wire to the element. The ampere
reading should agree with the
nameplate ‘AMP’ figure.
Low line voltage. Have source electrical system
checked by an electrician.
Faulty thermostat. Move thermostat dial through full
range. A definite ‘click’ should be
heard. If not, replace thermostat.
Water temperature
in tank below
settings at all
times
Faulty thermostat. Check thermostat adjustment.
Monitor thermostat as described in
Section III, Quarterly Inspection.
Replace if necessary.
Heating element not
working on all phases Check to see that heating element is working on all phases, by checking
the resistance (ohms) value for each
element and comparing with the
chart included in Section VI.
Heater improperly sized Verify heater is properly sized for the
flow rate and temperature rise of your
system. Replace elements with proper
size as necessary.
Relief valve
discharges
continuously
Excessive temperature or
pressure in tank Temperature and pressure relief valves are made to operate if the
water temperature exceeds 210°F or
water pressure exceeds the pressure
rating of the safety relief valve. If
trouble is excessive temperature, then
thermostat is not shutting off at the
right setting and thermostat must be
replaced.
Tepid water
temperature too
hot
Blockage in cold water inlet
to mixing valve Disconnect mixing valve and clean out cold water inlet pipe.
Mixing valve out of
calibration Re-calibrate mixing valve as described in Section V, Service and
Replacement of Parts, Re-Calibrate
Mixing Valve.
Tepid water
temperature too
cold
Blockage in hot water inlet
to mixing valve Disconnect mixing valve and clean out hot water inlet pipe.
Mixing valve out of
calibration Re-calibrate mixing valve as described in Section V, Service and
Replacement of Parts, Re-Calibrate
Mixing Valve.