EemaX EX120 T - User Manual

To Next Page

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. EX INSTALLATION DATE

EEMAX “SERIES-TWO” WATER HEATERS

MODELS COVERED - EX120 T, TC, T2 - 240/208 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

EX120 Relay.ppt 9/24/2008

Main Page

Need help?

Do you have a question about the EemaX EX120 T and is the answer not in the manual?

This document describes the Eemax "Series-Two" Electric Instantaneous Water Heaters, specifically models EX120 T, TC, T2, operating at 240/208 V. It serves as an installation guide and owner's manual, emphasizing safety, proper installation, and maintenance for optimal performance and energy savings.

Function Description:

The Eemax "Series-Two" heater is designed to provide instantaneous hot water for domestic use. It takes in cold water and heats it to temperatures suitable for normal household applications, up to a maximum of 140°F (60°C). The unit is an electric instantaneous water heater, meaning it heats water on demand rather than storing it, which contributes to energy efficiency. It operates on a dedicated independent circuit, using correctly rated wires and a circuit breaker. The heater's operation is dependent on water flow; it will not energize without sufficient water flow, and it modulates power to achieve the desired temperature.

Important Technical Specifications:

Models Covered: EX120 T, TC, T2
Voltage: 240/208 V
Pipe Connections: 3/4" NPT fittings for both inlet and outlet.
Output/kW (EX120): 11.5 kW
Amperage (EX120): 47.9 Amps at 240V
Voltage Output Ratios:
- 208 volts: 0.75 output ratio
- 220 volts: 0.84 output ratio
- 240 volts: 1.0 output ratio
Minimum Flow Rate for Operation:
- T, TC Models: 0.75 gpm
- T2, P2 Models: 1.5 gpm
Maximum Temperature: Approximately 140°F (60°C)
Electrical Circuit: Requires one dedicated independent circuit with UL listed 2 conductor and ground core copper wire cable, protected by one independent correctly rated Double Pole breaker (208, 220, 240 V).
Element Resistance: Should be under 10 ohms for proper functioning.

Usage Features:

Instantaneous Heating: Provides hot water on demand, eliminating the need for a storage tank.
Temperature Control (T, TC, T2 Models): Temperature can be adjusted using a temperature adjustment screw. The indicator light pulses when the unit is modulating power to maintain the set temperature. Increasing water flow above the thermostatic control's effective rate will reduce water temperature.
Temperature Control (P2 Models): Temperature is controlled by adjusting the water flow rate; higher flow rates result in lower water temperatures and vice-versa.
Energy Efficiency: Locating the unit as close as possible to the point of use helps optimize performance and energy savings.
Indicator Lights: Power indicator lights illuminate when the unit is operating. For T, TC, and T2 models, the light pulses On and Off initially, then stays fully on, and begins to pulsate when the desired temperature is reached and the unit is modulating power.
Safety Features: Equipped with an ECO (High Limit Thermostat) that trips if the unit overheats, requiring a manual reset. Grounding the system is critical to prevent electrical shock.

Maintenance Features:

Isolation Valves: Installation of full flow ball type isolating valves on both inlet and outlet pipes is recommended to allow the unit to be isolated for maintenance.
Element Replacement: A minimum of 8 inches of clearance above the unit is required for easy replacement of the heating element.
Troubleshooting Guide: The manual provides a comprehensive troubleshooting section for common issues such as "No Heat - Indicator Light Off" and "No Heat or Low Temperature with Indicator Light On." This includes checks for electrical supply, water flow, reversed connections, burned out elements, and tripped ECO.
ECO Reset: The ECO (High Limit Thermostat) can be reset by pushing a red button on each heater module after turning off the main circuit breaker.
Inlet Filter Screen: The inlet filter screen, located in the brass inlet boss, should be checked and cleared of debris if low water flow is suspected.
Temperature Adjustment: For T, TC, and T2 models, the thermostat adjustment screw(s) can be turned clockwise in small increments to increase temperature or counter-clockwise to decrease it.
Leak Checks: After plumbing, the system should be fully checked for water leaks at all connections.
Air Purging: Before commissioning, all hot water outlets must be opened one at a time for a minute or two to ensure continuous water flow, free from "gulping" and visible air pockets, to prevent premature element failure.
Technical Support: A toll-free technical service department (1-800-543-6163) is available for assistance with installation or performance issues. Users should have the serial number, model number, and installation date ready when calling.
Replacement Parts Diagram: The manual includes a diagram illustrating key replacement parts such as the heater core assembly, ECO, temperature adjustment knob, control boards, and Triac.