EemaX EX280T2T - User Manual

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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

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Questions and Answers

D
Destiny HaleAug 4, 2025
What to do if EemaX EX280T2T has no heat or low temperature with indicator light on?
- B
  Brandon YoungAug 4, 2025
  If your EemaX Water Heater shows the indicator light is on, but there's no heat or the temperature is low, you can try the following: First, reduce the water flow using an outlet ball valve. Next, ensure the unit is connected to the correct voltage supply as specified on the rating label on the front cover. You may need to test the heating element. If you have a “T2T” model, turn both thermostat adjustment screws clockwise in small increments until the indicator light(s) remains on, but be careful not to force the screw past its stop position. Also, check if the ECO (High Limit Thermostat) has tripped and reset it by pushing the red button on each heater module.
K
Kimberly AndersonAug 17, 2025
How to fix EemaX EX280T2T when no heat indicator light is off?
- M
  Michelle AllenAug 17, 2025
  If the heat indicator light is off on your EemaX Water Heater, first, ensure that the three main circuit breakers are turned on. Then, check for adequate water flow, ensuring it meets the minimum flow rate (0.75 gallons per minute for “T2T” models) and that the inlet filter screen is free of debris. Verify that the water connections are correct: cold water should enter on the right side, and hot water should exit on the left. You may also need to test the heating element with an ohmmeter; the resistance should be under 10 ohms. Finally, check if the ECO (High Limit Thermostat) has tripped and reset it by pushing the red button on each heater module.

Summary

Commissioning Your Heater

Preparation for Commissioning

Ensure system is free of air pockets and valves are open before switching on power.

T2 T Model Commissioning Procedure

Detailed steps for T2T models involving power indicators, flow rate, and temperature adjustment.

Troubleshooting

Symptom A: No Heat Indicator Light Off

Diagnosing and resolving issues when the heat indicator light is off.

Symptom B: No Heat or Low Temperature With Indicator Light On

Diagnosing and resolving issues when the indicator light is on but no heat or low temperature occurs.

The Eemax "Three Module, Single Phase" Water Heater is an electric instantaneous water heater designed for domestic use. It provides hot water on demand, eliminating the need for a storage tank and offering energy savings by heating water only when needed.

Function Description:

The heater takes in cold water and heats it to temperatures suitable for normal domestic usage, up to a maximum of 140°F (60°C). It is designed to be installed as close as possible to the point of use to optimize performance and energy savings. "Thermostatic" models, indicated by "T2T" or "T3" in the model number, can be fed with pre-heated water and used to boost temperature. The unit utilizes multiple heating modules to achieve the desired water temperature and flow rate.

Important Technical Specifications:

Model Covered: EX280T2T
Pipe Connections: 3/4" NPT
Mounting Position: Vertical, with water fittings at the bottom.
Water Inlet/Outlet: Cold water inlet on the right, hot water outlet on the left.
Weight: Approximately 15 lbs.
Electrical Requirements: Three dedicated independent 208/240V circuits, using correctly rated wires and circuit breakers.
Output (Model EX280T2T):
- 28 kW at 240 volts
- 21 kW at 208 volts
Amperage (Model EX280T2T): 3 x 39 AMPS at 240V
Output Ratio (208V vs 240V): Units rated for 240V can operate at 208V with a reduced output ratio of 0.75.
Flow Rate (Typical): About 0.85-2.5 GPM at showering temperature, best used when operating one outlet at a time.
Temperature Rise Chart (28 kW Output):
- 1 GPM: 127°F
- 1.5 GPM: 96°F
- 2 GPM: 76°F
- 2.5 GPM: 64°F
- 3 GPM: 55°F
- 3.5 GPM: 48°F
- 4 GPM: 65°F (Note: The 4 GPM value seems out of sequence with the others, possibly a typo in the original chart where it should be lower than 48°F, or it represents a different operating condition.)

Usage Features:

Instantaneous Heating: Provides hot water on demand, eliminating the need for a storage tank.
Point-of-Use Installation: Designed for installation close to the point of use for optimal performance and energy efficiency.
Thermostatic Control (T2T Models): Allows for temperature adjustment using screws. The unit modulates power (indicated by a pulsing light) to achieve the set temperature. A continuously on light indicates full power.
Single Outlet Operation: Best suited for operating one hot water outlet at a time to maintain desired temperature and flow.
Flow Rate Adjustment: The outlet ball valve can be used to gradually reduce water flow to achieve higher temperatures or to activate the thermostatic control.
Cold Water Restriction: For single-lever mixer faucets, restricting the cold water supply to match the hot water flow rate can improve control.

Maintenance Features:

Element Replacement: Requires a minimum of 8 inches clearance above the unit for easy element replacement.
Isolation Valves: Installation of full-flow ball valves on both inlet and outlet pipes allows the unit to be isolated for maintenance.
Air Pocket Purging: Before commissioning, all hot water outlets must be opened one at a time to ensure the system is free of air pockets, preventing premature element failure.
Inlet Filter Screen: The inlet filter screen, located in the brass inlet boss, should be checked for debris if there is low water flow.
ECO (High Limit Thermostat) Reset: If the ECO trips, it can be reset by pushing a red button on each heater module after turning off the main circuit breakers.
Troubleshooting Guide: The manual provides a troubleshooting section for common issues such as "no heat," "low water flow," "element burned out," and "incorrect power supply."
Technical Service: A toll-free technical service number (1-800-543-6163) is provided for assistance with installation or performance issues. Callers should have the serial number, model number (EX280), and installation date ready.

Safety Information:

Grounding: Failure to ground the system may result in death or serious injury. Ground must be brought to the "ground" at the circuit breaker panel.
Electrical Shock Hazard: Always turn off the electrical supply at the main breaker panel before removing the cover or servicing the water heater to avoid electrical shock.
Correct Voltage: Use only the voltage specified on the rating plate. Using incorrect voltage can cause death, serious bodily injury, or property damage.
Proper Installation: Installation must conform to the manual's instructions, electric company rules, and local codes (or the latest edition of the National Electrical Code). Improper installation, adjustment, alteration, service, or maintenance can cause death, serious bodily injury, or property damage.
No Soldering While Connected: When soldering pipe joints, the heater must be removed from the wall to prevent serious damage.
No Pipe Dope: Do not use pipe dope on the 3/4" NPT fittings; use Teflon tape only.
No Blow Torch: Never use a blow torch on pipes connected to the heater, as this can seriously damage the electronic flow switch.
Water Flow During Commissioning: Keep water flowing while carrying out commissioning procedures to prevent elements from energizing in air pockets.
Pressure and Temperature Relief Valve (PTRV): These units are not required by UL to have a PTRV, but local codes should be checked. If required, it should be installed on the outlet hot water pipe before the outlet ball valve.