EEMAX “THREE MODULE, SINGLE PHASE”

WATER HEATERS

ELECTRIC INSTANTANEOUS WATER HEATER

INSTALLATION GUIDE AND OWNERS MANUAL

MODELS COVERED:- EX280T2T -208/240 V

SPECIAL_________,______V

WARNING

READ THE GENERAL SAFETY SECTION BEGINNING ON THE INSIDE COVER

AND THEN THIS ENTIRE MANUAL BEFORE INSTALLING OR OPERATING THIS

WATER HEATER. IF YOU DON’T FOLLOW THE SAFETY RULES, THE UNIT WILL

NOT OPERATE PROPERLY AND IT COULD CAUSE DEATH, SERIOUS BODILY

INJURY AND/OR PROPERTY DAMAGE. READ ALSO THE ENCLOSED

WARRANTY CARD. WARRANTY OF THIS WATER HEATER WILL DEPEND ON

PROPER INSTALLATION AND OPERATION. THE WARRANTY SHALL BE VOID IF

THE DESIGN HAS BEEN ALTERED IN ANY WAY WHATSOEVER. THE

MANUFACTURER OF THIS HEATER WILL NOT BE LIABLE FOR ANY DAMAGES

BECAUSE OF FAILURE TO COMPLY WITH THE INSTALLATION AND

OPERATING INSTRUCTIONS OUTLINED ON THE FOLLOWING PAGES.

THE INSTALLATION MUST CONFORM WITH THE INSTRUCTIONS IN THIS

MANUAL; ELECTRIC COMPANY RULES; AND THE LOCAL CODES, OR IN

THE ABSENCE OF LOCAL CODES, WITH THE LATEST EDITION OF THE

NATIONAL ELECTRICAL CODE. THIS PUBLICATION IS AVAILABLE FROM

YOUR LOCAL GOVERNMENT OR PUBLIC LIBRARY OR ELECTRIC COMPANY

OR BY WRITING UNDERWRITERS LABORATORIES, 333 PFINGSTEN ROAD

NORTHBROOK, IL, 60062.

IF YOU REQUIRE ANY HELP OR HAVE ANY QUESTIONS RELATING TO THE

INSTALLATION OR PERFORMANCE OF THIS HEATER, PLEASE CALL OUR

TECHNICAL SERVICE DEPARTMENT TOLLFREE : 1-800-543-6163.

HAVE THE INFORMATION LISTED BELOW BEFORE CALLING :

SERIAL NO. MODEL NO. EX280 INSTALLATION DATE

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GENERAL SAFETY

The “Eemax three Module, Single Phase” heater is specifically designed to take in cold water and heat it to temperatures suitable for normal domestic usage up to a maximum of 140 F(60

C). To obtain optimum performance and energy savings, the unit should be located as near as possible to the point of use. “Thermostatic” models indicated by the letters “T2T or

T3” after the model number, these models and only these, can be fed with pre-heated water and be used to boost temperature

The unit is supplied with 3/4” NPT pipe connections. Under no circumstances use a blow

torch on pipe which is connected to the heater (serious damage to the electronic flow switch will result). Carefully use Teflon tape, ensuring no debris enter the heater. Do not use pipe dope.

Also, ensure that the pipes are clear of installation debris before fitting the heater.

THIS HEATER MUST HAVE THREE DEDICATED INDEPENDENT

208/240V CIRCUITS, USING CORRECTLY RATED WIRES AND

CIRCUIT BREAKERS.

WARNING

FAILURE TO GROUND THE SYSTEM MAY RESULT IN DEATH OR SERIOUS INJURY.

WARNING

IMPROPER INSTALLATION, ADJUSTMENT, ALTERATION, SERVICE OR MAINTENANCE

CAN CAUSE DEATH, SERIOUS BODILY INJURY OR PROPERTY DAMAGE. REFER TO

THIS MANUAL FOR ASSISTANCE OR CONSULT THE LOCAL ELECTRIC UTILITY FOR

FURTHER INFORMATION.

WARNING

WATER HEATERS EQUIPPED FOR ONE VOLTAGE ONLY: THIS WATER HEATER MAYBE

EQUIPPED FOR ONE VOLTAGE TYPE ONLY: CHECK THE RATING PLATE ON THE FRONT

COVER OF UNIT FOR THE CORRECT VOLTAGE. DO NOT USE THIS WATER HEATER WITH

ANY OTHER VOLTAGE OTHER THAN THE ONE SHOWN ON THE MODEL RATING PLATE.

FAILURE TO USE THE CORRECT VOLTAGE CAN CAUSE PROBLEMS WHICH CAN RESULT

IN DEATH, SERIOUS BODILY INJURY, OR PROPERTY DAMAGE. IF YOU HAVE ANY

QUESTIONS OR DOUBTS CONSULT EEMAX OR YOUR ELECTRIC COMPANY.

WARNING

HAZARD OF ELECTRICAL SHOCK! BEFORE REMOVING THE COVER OR SERVICING THE

WATER HEATER, MAKE SURE THE ELECTRICAL SUPPLY TO THE WATER HEATER IS

TURNED “OFF”. FAILURE TO DO THIS COULD RESULT IN DEATH, SERIOUS BODILY INJURY,

OR PROPERTY DAMAGE.

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I. MOUNTING THE UNIT

1) The unit should be mounted as close to the point of use as possible.

Do not install the heater above a faucet or “point of use” because the siphoning effect may

drain the heater which can cause premature element burn out.

2) This unit must only be mounted in a vertical position with the water fittings located at the

bottom of the unit. Mounting other than in the vertical position WILL cause element burn

out and cause permanent damage to the water heater.

3) The cold water inlet is on the right hand side and the hot water outlet is on the left hand side.

Under NO circumstances can these be reversed.

4) Leave a minimum of 8” above the unit for easy replacement of the element.

5) The heater should be fixed to the wall using all four mounting holes of the backplate. Unit

weight is approximately 15 lbs. Use an appropriate fastener for this weight. For the unit to

be mounted against hollow walls, suggest using steel wall anchors, with the correct grip

range and #6-32 screw size minimum.

NOTE: The heater should be installed below the level of all hot water outlets serviced by this

heater.

NOTE: PRESSURE AND TEMPERATURE RELIEF VALVE

These units are not required by UL to have a Pressure and Temperature Relief

Valve (PTRV). You should check with local codes to find out if one is required in your

area. If local codes require the use of a temperature and pressure relief valve it

should be installed on the outlet hot water pipe before the outlet ball valve.

Figure 2

Showers and the whole house, cabin or condo

Lavatory

Shower

MODELS: EX280T2T

Kitchen

Requirements:

Hot outlet

Eemax

Cold inlet

Output: 28 kW @ 240 volts

21 kW @ 208 volts

About 0.85-2.5 GPM at showering temperature.

Best used when operating one outlet at a time.

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MOUNTING

HOLES

MINIMUM - 8” CLEARANCE ABOVE UNIT serial #

GROUND

LUGS

L1 L2

C/B #1

L1 L2

C/B #2

L1 L2

C/B #3

LUG

TERMINALS

AT RELAYS

ELECTRICAL

HOOK-UP

208/240 V

To 3 Independent circuit breakers

Figure 1A

4

MINIMUM - 8” CLEARANCE ABOVE UNIT

EemaX

NPT

Elbow(s)

Union

Threaded type

Teflon tape only

No pipe dope

Pipe support

Inlet isolating valve- ball valve. (Always leave fully open when unit is in service.)

Pipe support

Outlet Isolating

Ball Valve

(throttle open just enough to obtain adequate flow of hot water)

Union

Threaded type

Teflon tape only

No pipe dope

NOTE: When soldering pipe joints remove heater from the wall. Serious damage can occur if any soldering is done while pipes are connected to the heater.

Take care to ensure that the pipes are correctly aligned with the inlet and outlet bosses in order to avoid excessive stress on the heater body molding.

Figure 1B

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II. PLUMBING HOOK-UP

1) The unit is supplied with ¾’’ NPT fittings (Figure 3), USE THESE. DO NOT USE

PIPE DOPE AND DO NOT SOLDER TO THE INLET OR OUTLET.

2) Take care to ensure that the pipes are correctly aligned with the inlet and outlet bosses

in order to avoid excessive stress on the heater body molding.

NOTE: When soldering pipe joints remove heater from the wall. Serious damage can occur

if any soldering is done while pipes are connected to the heater.

When tighten the fittings make sure to secure the fitting inside the heater to make

a tight connection.

Run water through the supply pipe to remove all debris from the pipe before connecting

the heater. Failure to do so could cause damage to the flow switch.

3) Install isolating valves (full flow ball valve type) on both inlet and outlet pipes. This allows unit

to be isolated for maintenance purposes. (Fig. 1B)

4) When all plumbing is complete, fully check the system for water leaks at all the plumbing

connections. If a leak is present take corrective action. Fully open both inlet and outlet

BALL VALVES.

Run all the hot water outlets fed by this heater one at a time, for a minute or two, until the water

flow is continuous, free from “gulping” and from all visible air pockets.

Figure 3

HOT OUTLET

¾’’ NPT

FITTING

DO NOT SOLDER

10”

NOTE:

ALL MOUNTING AND PLUMBING MUST BE COMPLETE BEFORE YOU

PROCEED WITH ELECTRICAL HOOK-UP.

TEST THE INSTALLATION FOR LEAKS BEFORE CONNECTING THE

ELECTRICAL SUPPLY.

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COLD INLET

¾’’ NPT

FITTING

DO NOT SOLDER

III. ELECTRICAL HOOK-UP

WARNING

BEFORE BEGINNING ANY WORK ON THE ELECTRICAL INSTALLATION,

BE SURE THE SWITCH AT MAIN BREAKER PANEL IS “OFF” TO AVOID

ANY DANGER OF ELECTRICAL SHOCK.

“Three Module, Single Phase” heaters are manufactured to the following specifications:

Figure 4

MODEL TYPE OUTPUT / kW VOLTAGE / V AMPERAGE

EX280T2T

EX280T3

28

28

*

*

240 3 x 39 AMPS

240 3 x 39 AMPS

SPECIAL

* Units rated of 240 V can operate at 208 V with reduced output.

The output will vary in accordance with the following ratios: volts output ratio

208 volts 240 volts

.75 1.0

This unit must have its own independent circuits, using 3 SETS of UL listed 2 conductor and ground core copper wire cable of the appropriate size protected by 3 separate and independent correctly rated Double Pole Breakers. (220, 240 V, see Figures 4 and 5). Wire entry into the unit must be made through the 4 holes provided in the flange on the backplate.

The “live” wires should be connected to the slots in the terminal block marked L1 and L2. The ground lead must be connected to the slot marked GND. GROUND MUST BE BROUGHT TO

THE “GROUND” AT THE CIRCUIT BREAKER PANEL.

Figure 5

3 Separate and independent correctly rated Double pole breakers (208/240 Volts)

Circuit Breaker Panel

DANGER

FAILURE TO GROUND THE SYSTEM MAY RESULT IN DEATH OR SERIOUS INJURY.

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IV COMMISSIONING YOUR HEATER

IMPORTANT

BEFORE SWITCHING “ON” THE POWER AT THE MAIN CIRCUIT BREAKER PANEL

MAKE SURE THAT THE HOT WATER CIRCUIT IS FREE OF AIR POCKETS OR ELSE

PREMATURE FAILURE OF THE ELEMENT WILL OCCUR. TO DO THIS OPEN ALL HOT

WATER OUTLETS ONE AT A TIME FOR A MINUTE OR TWO UNTIL THE WATER FLOW

IS CONTINUOUS AND FREE FROM “GULPING” AND FREE FROM VISIBLE AIR POCKETS.

1) Open fully both inlet and outlet valves at the heater.

2) Open any hot water outlet in the system. If the outlet is a “single lever” mixer type turn to the

hottest position. Run for one minute to clear all the air from the system.

3) Slowly close OUTLET ball valve until the water flow from the faucet just starts to reduce.

NOTE: This process has two effects. One, any air in the system will be purged out. Two, the

heater units will be pressurized at the supply pressure. This will prevent the elements free from

air pockets while energized.(Note: Keep water flowing while carrying out the procedures

outlined below. Flowrate should be at 2-3 gallons per minute to ensure all 4 modules to

activate)

GO TO APPROPRIATE SECTION FOR YOUR MODEL

NOTE: For the following sections the first unit is the right hand heating module and the second

unit is the right center, far left hand is the forth heating module.

“T2T” MODELS a) Switch on the power to the first unit. The power indicator light should illuminate. b) Switch on the power to the second unit, again the power indicator lights should illuminate.

Note: These lights should pulse On and Off at first and after about 20- 30 seconds

it should stay fully on.

c) Switch on the power to the third unit, again the power indicator lights should illuminate.

Note: This light should pulse On and Off at first and after about 20- 30 seconds. It may not

stay fully on.

d) Use the OUTLET ball valve to gradually reduce the water flow until the power indicator light

on the third unit begins to pulsate. The water temperature should now be approximately

140 F.

e) The thermostat is now set and the water temperature will always be the same when the

indicator light is pulsing.

f) Increasing water flow (above the flow rate at which the thermostatic control is no longer

effective) will reduce the water temperature.

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For “T2T” Models

If a lower temperature is required, turn the temperature adjustment screw(s) counter-clockwise about 1/8 of a turn (See Figure). Wait 15-20 seconds and check the temperature at the fixture.

Repeat this process until the desired temperature has been achieved. (For T2T models try to adjust both temperature adjustment screws by about the same amount so that the lights pulse at the same rate.) If you have reduced the temperature considerably from the 140 F setting, you could now open up the outlet ball valve slightly to achieve a higher rate of flow.

When the indicator light is on continuously, the unit is emitting full power. When it is pulsing, the unit is modulating the power to achieve the temperature set by means of the temperature adjustment screw.

THE TEMPERATURE CONTROLLING

POTENTIOMETER IS A PRECISION

COMPONENT. ADJUST GENTLY AND

DO NOT TURN BEYOND THE MIN.

AND MAX. STOP POINTS

MINIMUM SETTING

ALL HEATERS

MAXIMUM SETTING

In order to obtain good control at “single lever” mixer type faucets (single spout) the cold water supply to the faucet should be restricted to give approximately the same flow rate of cold water to the faucet as the hot water coming from your Eemax heater. The simplest method of doing this is by partially closing the cold water valve under the sink, as long as this does not shut off pressure to your Eemax heater.

MAXIMUM TEMPERATURE RISE CHART ( 0 F )

OUTPUT

28 KW

FLOW RATE ( GAL. PER MIN. )

1 1.5

2 2.5

3 3.5

4

65 127 96 76 64 55 48

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TROUBLESHOOTING

SYMPTOM “A”: NO HEAT INDICATOR LIGHT OFF

1) ELECTRIC SUPPLY IS OFF

Turn on the THREE main circuit breakers.

2) NO OR LOW WATER FLOW

Ensure that the minimum flow rate to switch on your heater is met. “T2T” Models minimum flow rate = 0.75 gallons per minute. Also check that the inlet filter screen is clear from any debris. This is located in the brass inlet boss.

3) WATER CONNECTIONS ARE REVERSED

Cold water inlet = right side, hot water outlet = left side.

4) ELEMENT BURNED OUT

TURN OFF THE THREE MAIN CIRCUIT BREAKERS!

Using an ohmmeter test the resistance of the heating element across the two threaded termination rods on top of the element.

The resistance reading should be under 10 ohms. If the resistance is much greater than this value, call Eemax for a replacement element.

5) ECO TRIPPED (High Limit Thermostat)

TURN OFF THE THREE MAIN CIRCUIT BREAKERS!

Reset by pushing in red button on each heater module.

SYMPTOM “B”: NO HEAT OR LOW TEMPERATURE WITH INDICATOR LIGHT ON

1) WATER FLOW TOO HIGH

Reduce the water flow by using an outlet ball valve. See page 9 for temperature rise at various flow rates.

2) INCORRECT POWER SUPPLY

Make sure that the unit is connected to the voltage supply specified on the rating label on the the front cover of the unit and no other.

3) ELEMENT BURNED OUT

TURN OFF THE THREE MAIN CIRCUIT BREAKERS!

Repeat the steps from paragraph 4 above.

4)THERMOSTAT ADJUSTMENT SCREW NOT TURNED UP (Models “T2T” only.)

Turn both thermostat adjustment screws clockwise in small increments until the indicator light(s) remains on. Take care not to force the screw past it’s stop position. See page 9 for example.

5) ECO TRIPPED (High Limit Thermostat)

TURN OFF THE THREE MAIN CIRCUIT BREAKERS!

Reset by pushing in red button on each heater module.

10

REPLACEMENT HEATER

CORE ASSEMBLY

EX630 - 9.5 KW @ 240 V

ECO (High Limit Thermostat)

Push to Reset

CONTROL BOARDS

EEMAX REPLACEMENT PARTS DIAGRAM serial #

Triac - EX 18

7 - Wire

EX 100G

8 - Wire

EX 284

To 3 Independent circuit breakers

EEMAX INC., 353 Christian Street, Oxford, CT 06478 Tel: (203) 267-7890

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