EemaX EX320T3 User manual

EemaX
THREE PHASE THERMOSTATIC
ELECTRIC INSTANTANEOUS WATER HEATER
MODELS: EX320T3, EX320T2T, EX240T3, EX240T2T
EX180T3, EX180T2T (277 volts)
INSTALLATION GUIDE AND OWNERS MANUAL
WARNING
BEFORE ATTEMPTING INSTALLATION OF THIS UNIT OR MAKING ANY ADJUSTMENTS
TO THE UNIT ALWAYS BE SURE MAIN CIRCUIT BREAKER IS OFF TO PREVENT DANGER
OF SERIOUS ELECTRIC SHOCK.
INSTALLER/ CONSUMER RESPONSIBILITIES
PLEASE TAKE THE TIME TO READ NOT ONLY THIS MANUAL BUT ALSO THE
WARRANTY CARD ENCLOSED. WARRANTY OF THIS HEATER WILL DEPEND ON PROPER
INSTALLATIONAND OPERATION. THE WARRANTY SHALL BE VOID IF THE DESIGN OR
STRUCTURE OF THE WATER HEATER HAS BEENALTERED IN ANY WAY WHATSOEVER. THE
MANUFACTURER OF THIS WATER HEATER WILL NOT BE LIABLE FOR ANY DAMAGES
BECAUSE OF FAILURE TO COMPLY WITH THE INSTALLATIONAND OPERATING
INSTRUCTIONS OUTLINED ON THE FOLLOWING PAGES.
IF YOU REQUIRE ANY HELP OR HAVEANY QUESTIONS RELATING TO THE
INSTALLATION OR PERFORMANCE OF THIS HEATER, PLEASE CALL OUR TECHNICAL
SERVICE DEPARTMENT TOLL-FREE: 1-800-543-6163
HAVE THE INFORMATION LISTED BELOW BEFORE BEFORE CALLING.
MODEL :
SERIAL NO :
INSTALLATION DATE :
ELEMENT RESISTANCE: OHMS
SWITCH ON FLOW RATE: GPM
OPERATING TEMPERATURE
MIN MAX
Eemax Inc., 353 Christian ST., Oxford, CT 06478
1

GENERAL
The Eemax “Three Phase Thermostatic” water heater is specifically designed to take in
cold or pre-heated water and heat it to temperatures suitable for commercial washing,
sluicing or processing up to a maximum temperature of 180 F (82 deg. C). To obtain
optimum performance and energy savings, the unit should be located as near as possible
to the point of use. The unit must only be installed in a vertical position with the inlet
and outlet at the bottom. The power is activated by individual electronic flow switches located
in each of the three heating modules. These will be damaged by excessive heat, do not solder
any pipes that are in contact with the heater.
Also ensure pipes are clear of installation debris before fitting the heater, otherwise the flow
switches could jam in the “on” position. The unit must be connected to its own individual electric
circuit protected by a suitably rated three pole breaker. The maximum voltage which can be
applied across any heating module is 277 volts.
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.
The unit is supplied with compression rings and nuts suitable for direct coupling to standard
1/2 “ ( 5/8 “ outside diameter ) copper or plastic piping. There is no need for additional screwed
fittings and under no circumstances use a blow torch on pipe which is connected to the heater
(serious damage to the electronic flow switch will result). Do not use pipe dope or Teflon tape.
WARNING
Failure to ground the system may result in death or serious injury.
2

MOUNTING THE UNIT
1) The unit should be mounted as close to the point of use as possible.
2) This unit must only be mounted in the vertical position with the water fittings located at the
bottom of the unit. Mounting other than in the vertical position WILLcause element burn out.
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 elements.
5) The heater should be fixed to the wall using screws in the four mounting holes at each corner
of the backplate.
6) The unit should be installed in the plumbing system in such a way that there is no tendency
for the unit to be starved of water: for example: by an excessive draw-off of cold water just
before the unit. Also do not fit an unrestricted hot water draw-off point below the heater as
this will tend to empty the heater by siphoning.
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.
3

1) The unit is supplied with compression fittings, USE THESE; DO NOT USE TAPERED
THREADED PIPE FITTINGS AND DO NOT SOLDER PIPE 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.
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. (see Fig. 1)
4) When all plumbing is complete, fully check the system for water leaks at all plumbing
connections. If leak is present take corrective action. If leak is at compression fitting slowly
tighten compression nut until it stops. Fully open both inlet and outlet ball valves.
Run all 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.
PLUMBING HOOK-UP
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.
7 “
Hot outlet
compression
fitting
DO NOT
SOLDER
Cold inlet
compression
fitting
DO NOT
SOLDER
4

ELECTRICAL HOOK-UP
WARNING
HAZARD OF ELECTRICAL SHOCK! BEFORE BEGINNING ANY WORK ON THE
INSTALLATION, MAKE SURE THE ELECTRICAL SUPPLY TO THE HEATER IS TURNED
“OFF”. FAILURE TO DO THIS COULD RESULT IN DEATH, SERIOUS BODILY INJURY,
OR PROPERTY DAMAGE.
WARNING
WATER HEATERS EQUIPPED FOR ONE VOLTAGE ONLY: CHECK THE RATING PLATE
ON THE FRONT OF THE UNIT. DO NOT USE THIS WATER HEATER WITHANY VOLTAGE
OTHER THAN THE ONE SHOWN ON THE MODEL RATING PLATE. FAILURE TO DO SO
CAN RESULT IN DEATH, SERIOUS BODILY INJURY, OR PROPERTY DAMAGE. IF YOU
HAVE ANY QUESTIONS OR DOUBTS CONSULT YOUR ELECTRIC COMPANY.
This heater must have its own independent circuit using five wires; three live, one neutral and
one ground of the appropriate rating protected by the correctly rated four pole breaker
DANGER
FAILURE TO GROUND THE SYSTEM MAY RESULT IN DEATH OR SERIOUS INJURY
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 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 FROM VISIBLE AIR POCKETS.
RATINGS OF “EX” THREE PHASE MODELS
MODEL MAX. OUTPUT CURRENT TEMPERATURE RISE (F)
@ 277V PER PHASE 1.5gpm 2.0gpm 2.5gpm 3.0gpm 3.5gpm 4.0gpm
EX 320 32 KW 38.5 145 109 87 73 62 54
EX 240 24 KW 28.9 109 82 65 54 47 41
EX 180 18 KW 21.7 82 61 49 41 35 31
THIS UNIT MUST NOT BE CONNECTED IN DELTACONFIGURATION
5

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 premature failure of the heating element will occur.
To do this open all hot water faucets one at a time for a minute or two until the water flow
is continuous and free from “gulping” and from visible air pockets.
1) With inlet and outlet BALL VALVES fully open, turn on a hot water outlet.
2) Run for 1 minute.
3) Switch on electric supply at circuit breaker panel.
4) The power indicator light should now come on (see Fig. 1), pulsing at first. Allow 40
seconds for the lights to stay full on, the heater is now operating at full power.
NOTE: At this point water temperature may not be hot.
5) Using the OUTLET BALL VALVE slowly reduce water flow until desired temperature is
achieved at hot water outlet.
NOTE: The water temperature is regulated by the flow through the heater. The lower the
flow the higher the temperature and vice versa.
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
6) Now turn the temperature adjustment screw on the first module counter clockwise about
1/8 of a turn, wait for 10-15 seconds and see if the indicator light begins to pulse. If it does
not, turn another 1/8 of a turn, wait and again see if the lamp begins to pulse. Repeat until
the light is pulsing regularly which indicates that the temperature has stabilized at the set
temperature. Repeat with modules two and three. Check that the outlet temperature is at
6

the desired temperature and that all three elements are pulsing equally. The thermostats
are now set and the water temperature will always be the same when the lights are pulsing.
7) Check performance of flow switch by opening and closing the faucet of the outlet valve a
few times.
THE POWER INDICATOR LIGHT SHOULD ONLY BE ON WHEN WATER IS FLOWING
THROUGH THE UNIT. For expected temperature rise at various rates of flow see chart
8) It is possible that drawing off cold water at comparatively high rates of flow elsewhere in
the building at the same time that the heater is working, could cause premature element
failure. Care should be taken not to starve the unit of cold water. To prevent this from
happening, open fully the main valve on the cold supply to the building and throttle back
the control valves to the other cold water outlets.
7

TROUBLESHOOTING
SYMPTOM: NO HEAT INDICATOR LIGHT OFF
1)ELECTRIC SUPPLY IS OFF
Turn on the main circuit breaker.
2)NO OR LOW WATER FLOW
Ensure that the minimum flow rate to switch on your heater is met,
for this figure refer to the front cover of this manual.
Also check that the inlet filter screen is clear from any debris.
3)WATER CONNECTIONS ARE REVERSED
Cold water inlet = right side, hot water outlet = left side.
4)ELEMENT BURNED OUT
TURN OFF THE MAIN BREAKER!
Using an ohmmeter test the resistance of the heating element
across the two threaded termination rods on top of the element.
See the front cover of this manual for the correct value.
If the resistance is much greater than the correct value, call
your supplier for a replacement element.
SYMPTOM: 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 5
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 MAIN BREAKER!
Repeat the steps from paragraph 4 above.
4)THERMOSTATADJUSTMENT SCREW NOT TURNED UP
Turn the thermostat adjustment screw clockwise in small
increments until the indicator light remains on. Take care not to
force the screw past it’s stop position.
8

N L1 L2 L3
For supply connections use 8 AWG or
larger wires suitable for at least 75 c (167F)
THIS APPLIANCE MUST BE GROUNDED
This heater is only suitable for 4 wire
3 phase connection with a maximum of
277 volts across each element.
REPLACEMENT PARTS DIAGRAM
THERMOSTATIC
PCB
PART# EX100
HEATER CORE ASSEMBLY
FOR EX180 T3 PART# EX1280
FOR EX240 T3 PART# EX960
FOR EX320 T3 PART# EX720
FOR ELEMENT ( PLEASE QUOTE POWER AND
VOLTAGE REQUIREMENTS WHEN ORDERING)
TRIAC
PART# EX18
9