Hubbell HE, HSE User Manual

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OPERATING AND MAINTENANCE MANUAL FOR COMMERCIAL HORIZONTAL CEILING-HUNGELECTRIC WATER HEATER

ELECTRIC HEATER COMPANY

BASE MODELS “ HE and HSE ”

HUBBELL

ELECTRIC HEATER COMPANY

P.O. BOX 288

STRATFORD, CT 06615

PHONE: (203) 378-2659

FAX: (203) 378-3593

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°Ffor 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.

2

 

TABLE OF CONTENTS

 

SECTION

TITLE

PAGE #

I

GENERAL DESCRIPTION AND CONSTRUCTION

5

II

INSTALLATION

8

III

SCHEDULED MAINTENANCE AND OPERATION

11

IV

TROUBLESHOOTING

13

V

SERVICING AND REPLACEMENT OF PARTS

14

VI

MISCELLANEOUS CHARTS AND FORMULAS

20

3

4

SECTION I - GENERAL DESCRIPTION AND CONSTRUCTION

GENERAL DESCRIPTION

This book describes a packaged electric water heater that is a stationary, self-containedunit. The complete assembly consists of the storage tank, immersion electric heating element(s), thermostat, 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

The standard storage tank is constructed of steel and internally lined with specially formulated Hydrastone cement to a ½-inchminimum 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 hot water connections. Water entering the cold water inlet is deflected by means of a baffle within the tank. A ¾-inchFNPT 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. A¾-inchGHT connection is supplied for draining. See drawing for locations and sizes.

CONTROL THERMOSTAT

The water heater is supplied with an immersion thermostatic switch that is installed and wired at the factory. The immersion thermostat can be adjusted through a range of 100° - 190° F and is adjustable with a flat tip screwdriver. An optional low range (30° - 110° F) thermostat may be supplied.

5

TEMPERATURE HIGH LIMIT SWITCH

As a safety device, a surface mounted high temperature cut-offswitch with manual reset, factory set at 190° F is provided. In the event of anover-temperaturecondition, the thermostat will disengage the power from the unit, (in the HSE model the thermostat will disengage the operating coils in the magnetic contactor). The high limit must be manually reset thereafter to restart the heater.

Manual Reset

HEATING ELEMENT

The water heater is supplied with an electric immersion heating element assembly(s), composed of incoloy or copper sheathed elements that are brazed into a brass flange. Each assembly is fastened to a corresponding tank flange using a gasket and four (4) 3/8-16x1-inchlong hex head steel bolts and nuts. See drawing for voltage and power ratings.

3-PhaseIncoloy Sheathed Element

Single Phase Copper Sheathed Element

6

MAGNETIC CONTACTOR (HSE Models Only)

The magnetic contactor(s) is a heavy-dutyresistive load type rated for 100,000 cycles. The contactor supplies power to the heating element(s) based on the resistive load(non-inductive)of the heater only when the thermostatic switch is engaged, thereby pulling in the contacts until the desired temperature is reached. At this point, the contacts will drop out, which in turn disconnects power from the elements.

OUTER SHELL AND INSULATION

The tank is encapsulated in 2-inchthick polyurethane foam insulation. The insulation is protected by a high impactnon-corrodingcolorized composite protective jacket.

DRIP PAN (Optional)

A drip pan assembly may be supplied as an option with the unit. It is designed to mount directly beneath the water heater as shown in the sketch on page 4.

SWAY RESISTANT MOUNTS (Optional)

Optional sway resistant mounts may be supplied to further secure the tank from longitudinal movement. Additional 3/8” diameter threaded rods (not supplied) are fastened into additional nuts that are welded to the support mount.

3/8” Threaded Tie-RodConnected to Building Structure

Standard Mount

Optional Sway Resistant Mount

7

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. ANSIZ21.22-1971.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 FURNISHINGS OR PROPERTY.

WATER HEATER PLACEMENT

1.Locate heater in a dry location nearest to the point of most frequent hot water use.

2.Mount tank using 3/8” diameter threaded rod (not supplied) to suitable ceiling supports (not supplied).

3.Install 3/8” diameter threaded rod (not supplied) into the four (4) mounting assemblies on the tank.

4.Install drip pan, if supplied.

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

6.Leave a minimum of 13” clearance for element withdrawal, if necessary.

7.Do not install in an area where flammable liquids or combustible vapors are present.

8

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.Thread cold water inlet and diffuser assembly into tank. Diffuser slots must be pointing down toward the bottom of the tank.

Cold Water Inlet

Diffuser

Diffuser Slots

Drain Valve

2.Connect the cold water inlet and hot water outlet to the appropriate connections as shown; refer to the drawing for location and sizes.

3.Install in-linevacuum breaker, if supplied.

4.Install in-linepressure and temperature gauge, if supplied.

5.Install the combination temperature and pressure safety relief valve in the tapping provided. Note that this is required by law for safety considerations.

Outlet to floor drain

Install into provided tapping

Manual Release

Lever

Temperature Probe

6.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.

9

FILLING THE HEATER

1.Completely close the drain valve.

2.Open the highest hot water faucet to allow all air to escape from piping.

3.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 faucet.

ELECTRICAL INSTALLATION

1.Enter electric enclosure with properly sized feeder leads. Single-phaseinstallations require two (2) leads; three phase installations require three (3) leads.

2.Install these power leads onto terminals ‘1’ and ‘3’ of the high temperature cut-off,for single phase installation, or the magnetic contactor for3-phaseinstallation.

3.Torque screws per torque chart included in Section VI.

4.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.

10

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.

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 heater.

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 + 5°F.

d.If these two readings do not coincide within acceptable tolerances and verification has been made of the accuracy of the temperature-readinggauge, 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.

11

4.Inspect ceiling supports for tightness and/or damage.

5.Check for loose electrical connections. Tighten as necessary.

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 3-4minutes.

e.Close drain valve.

f.Open hot water valve.

g.Turn power supply ON.

12

SECTION IV – TROUBLESHOOTING

Symptom

Probable Cause

Corrective Action / Remedy

No hot water

Circuit breaker tripped at source.

Reset circuit breaker.

 

High limit switch tripped.

Reset high limit switch.

 

 

 

 

Loose wires.

Tighten wires. Torque screws per torque

 

 

chart included in Section VI.

 

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.

 

Magnetic contactor does not

Replace complete magnetic contactor.

 

energize.

Because of the design of this particular

 

 

contactor, it is more desirable to replace

 

 

complete control rather than rebuilding

 

 

coil, contacts and springs, etc.

Water temperature

Faulty thermostat.

Check thermostat adjustment. Monitor

below settings at all

 

thermostat as described in Section III,

times

 

Quarterly Inspection. Replace if

 

 

necessary.

 

Heating element not working on

Check to see that heating element is

 

all phases

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. See formulas included in

 

 

Section VI. Replace elements with

 

 

proper size as necessary.

Relief valve discharges

Excessive temperature or

Temperature and pressure relief valves

continuously

pressure in tank

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.

 

 

13

SECTION V - SERVICING & REPLACEMENT OF PARTS

WARNING / CAUTION

Before servicing or replacing any part make sure to turn the power supply switch to the OFF position.

SURFACE TEMPERATURE HIGH LIMIT CUT-OFF

1.Disconnect power from unit.

2.Remove access cover.

3.Disconnect the four (4) 14 gauge wires.

Control Wires

4. Remove the two (2) mounting screws.

Mounting Screws

5. Replace control and install new high limit switch by performing above steps in reverse order.

14

HEATING ELEMENT

1.Disconnect power from unit.

2.Shut off incoming water supply.

3.Attach hose to drain connection.

4.Lift manual release lever on relief valve to let air into system or break union on outgoing water line.

5.Drain water from tank.

6.Disconnect the wires from the heating element terminals.

7. Remove the 3/8-16nuts.

Tank Flange

Element Terminals

 

Nuts

8. Withdraw element assembly and remove gasket. Gasket

Element Assembly

9.Install new gasket and insert new heating element.

10.For 3-phaseheaters, rewire the element according to the voltage and phase rating of the unit as shown below. For single phase operations, connect wires to terminals.

11.Fill tank and check around gasket for any leaks.

15

16

IMMERSION THERMOSTAT

1.Disconnect power from unit.

2.Remove access cover and locate thermostat.

3.Remove high limit cover screw and cover.

Cover

Cover Screw

4. Disconnect the two (2) 14 gauge wires.

Wires

Capillary Tube

5.Remove capillary tube and bulb from thermowell.

6.Remove two (2) mounting screws.

Mounting Screws

7.Replace thermostat using reverse procedure. (Note: Be sure to place capillary tube into slot in base prior to installing cover.)

17

MAGNETIC CONTACTOR

1.Disconnect power from unit.

2.Disconnect line and load wires to contactor.

3.Disconnect two (2) 14 gauge control circuit wires.

Control Wires

Line Wires

Load Wires

4. Loosen two (2) holding screws and remove contactor.

Mounting Screws (Bottom screw not shown)

5.Replace with new contactor using reverse procedure.

18

RELIEF VALVE

1.Disconnect power from unit.

2.Shut off incoming water supply.

3.Lift test lever on relief valve to relieve pressure in tank.

4.Disconnect overflow piping.

5.Unscrew relief valve, remove assembly and replace with new one.

6.Connect overflow piping.

7.Turn on incoming water supply and check for leaks.

8.Turn safety switch to ON position.

Test Lever

Overflow Piping Outlet

Tank Connection

Temperature Probe

19

SECTION VI – MISCELLANEOUS CHARTS AND FORMULAS

FORMULAS

3-PHASEELEMENT CHART

Element

Power (kW)

Immersion

 

Resistance (Ohms)

 

Part #

208V

240V

480V

Length

Hairpin

1 Φ

3 Φ DELTA

3 Φ WYE

2-38683N

2.5

3

4

13"

57.6

19.2

57.6

38.6

3-38683N

3

4

5

13"

43.2

14.4

43.2

28.9

4-38683N

4

5

6

13"

34.4

11.5

34.4

23.0

5-38683N

5

6

8

13"

27.9

9.3

27.9

18.7

6-38683N

6

8

10

13"

21.6

7.2

21.6

14.5

7-38683N

8

10

12

13"

17.1

5.7

17.1

11.5

8-38683N

10

12

15

13"

14.4

4.8

14.4

9.6

9-38683N

12

15

20

15"

12.1

4.0

12.1

8.1

10-38683N

15

20

----

15"

9.1

3.0

9.1

6.1

11-38683N

17.3

----

----

15"

7.5

2.5

7.5

5.0

20