EemaX EX280T2T User manual

ELECTRIC INSTANTANEOUS WATER HEATER
INSTALLATION GUIDE AND OWNERS MANUAL
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
EEMAX “THREE MODULE, SINGLE PHASE”
WATER HEATERS
MODELS COVERED:- EX280T2T -208/240 V
SPECIAL_________,______V
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.
WARNING
1

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
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.
FAILURE TO GROUND THE SYSTEM MAY RESULT IN DEATH OR SERIOUS INJURY.
WARNING
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.
2

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
3
Requirements:
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.
Showers and the whole house, cabin or condo
MODELS: EX280T2T
Eemax
Lavatory
Shower
Kitchen
Hot outlet Cold inlet

MINIMUM - 8” CLEARANCE ABOVE UNIT
4
Figure 1A
MOUNTING
HOLES
To 3 Independent
circuit breakers
serial #
LUG
TERMINALS
AT RELAYS
ELECTRICAL
HOOK-UP
208/240 V
L1 L2
C/B #2
L1 L2
C/B #3
L1 L2
C/B #1
GROUND
LUGS

Inlet isolating valve-
ball valve. (Always leave fully
open when unit is in service.)
MINIMUM - 8” CLEARANCE ABOVE UNIT
Outlet Isolating
Ball Valve
(throttle open
just enough to
obtain adequate
flow of hot water)
Union
Threaded type
Teflon tape only
No pipe dope
NPT
Elbow(s)
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.
Pipe
support
Pipe support
EemaX
Figure 1B
5

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.
HOT OUTLET
¾’’ NPT
FITTING
DO NOT SOLDER
COLD INLET
¾’’ NPT
FITTING
DO NOT SOLDER
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.
10”
Figure 3
6

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:
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.
DANGER
FAILURE TO GROUND THE SYSTEM MAY RESULT IN DEATH OR SERIOUS INJURY.
* Units rated of 240 V can operate at 208 V with reduced output.
The output will vary in accordance with the following ratios:
208 volts 240 volts
.75 1.0output ratio
volts
MODEL TYPE OUTPUT /kW VOLTAGE /V AMPERAGE
EX280T2T 28 240 3x39 AMPS
EX280T3 28 240 3x39 AMPS
SPECIAL
3 Separate and independent
correctly rated Double pole
breakers (208/240 Volts)
Figure 4
Figure 5
7
*
Circuit Breaker Panel
ON
ON
OFF
OFF
ON
OFF
ON
OFF
ONON
OFFOFF
*

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.
IV COMMISSIONING YOUR HEATER
“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.
8

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.
ALL HEATERS
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 ( 0F )
FLOW RATE (GAL. PER MIN. )
OUTPUT 1 1.5 2 2.5 3 3.5 4
28 KW 65 127 96 76 64 55 48
9
MINIMUM SETTING MAXIMUM SETTING
THE TEMPERATURE CONTROLLING
POTENTIOMETER IS A PRECISION
COMPONENT. ADJUST GENTLY AND
DO NOT TURN BEYOND THE MIN.
AND MAX. STOP POINTS

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

Triac - EX 18
EX630 - 9.5 KW @ 240 V
REPLACEMENT HEATER
CORE ASSEMBLY
EEMAX REPLACEMENT PARTS DIAGRAM
CONTROL BOARDS
7 - Wire
EX 100G
EEMAX INC., 353 Christian Street, Oxford, CT 06478 Tel: [phone]
11
To 3 Independent circuit breakers
serial #
8 - Wire
EX 284
ECO (High Limit Thermostat)
Push to Reset