T-H3 Installation Manual

5 Page
INTRODUCTION
 This manual provides information necessary for the installation, operation, and maintenance
of the water heater.
 The model description is listed on the rating plate which is attached to the side panel of the
water heater.
 Please read all installation instructions completely before installing this product.
 If you have any problems or questions regarding this equipment, consult the manufacturer or
its local representative.
 This equipment is an on-demand, tankless water heater designed to efficiently supply endless
hot water for your needs when properly sized and installed.
 These high efficiency models have a built-in secondary heat exchanger that absorbs latent
heat from the exhaust gas.
 The 240 Indoor, 340 Indoor, and 540 Indoor models are only to be installed indoors. The 240
Outdoor, 340 Outdoor, and 540 Outdoor models are only to be installed outdoors.
 The principle behind tankless water heaters is simple:
Exhaust
Secondary
heat exchanger
Intake port
Condensate
drain port
Cold water inlet
Gas
Hot water outlet
Computer board
Fan motor
Gas valves
Igniter
Thermistor
Thermistor
Bypass valve
Primary
heat exchanger
Exhaust thermistor
Water control valve
Thermistor
Flow sensor
Burners
1
2
3
4
5
4
6
7
7
7
8
4
4
7
*This diagram illustrates tankless water heater design concepts only and does not accurately represent
the water heater’s physical description.
1. A hot water fixture is turned on.
2. Water flows through the heater.
3. The water flow sensor detects the water flow.
4. The computer initiates the fan motor and gas valve to let gas flow through the heater and sends a
signal to the igniter to create an ignition spark.
5. The gas ignites and flames appear within the burner chamber.
6. Water is heated as it flows through the heat exchanger.
7. Using thermistors to measure temperatures throughout the water heater, the computer modulates
the gas and water valves to ensure proper output water temperature and hot water outflows.
8. When the fixture is turned off, the unit shuts down.
Introducon
Installaon Manual