Introduction - Takagi 110U Indoor (T-KJr2U-IN) Installation Manual And Owner's Manual

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.
• The 110U Indoor (T-KJr2U-IN), 310U Indoor (T-K4U-IN) and 510U Indoor (T-D2U-IN) models
are only to be installed indoors (direct-vent (double vent) convertible). The 110U Outdoor
(T-KJr2U-OS), 310U Outdoor (T-K4U-OS) and 510U Outdoor (T-D2U-OS) models are only to be
installed outdoors.
• The principle behind tankless water heaters is simple:
Flow adjustment valve
Computer board
Flow sensor
Thermistor
*This diagram illustrates tankless water heater design concepts only and does not accurately
represent the water heater's physical description.
1. A hot water tap is turned on.
2. Water enters the heater.
3. The water flow sensor detects the water flow.
4. The computer initiates the fan motor 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 circulates through the heat exchanger and then gets hot.
7. Using thermistors to measure temperatures throughout the water heater, the computer modulates
the gas and water valves to ensure proper output water temperature.
8. When the tap is turned off, the unit shuts down.
Exhaust vent collar
Thermistor
Hot water outlet Cold water inlet
5
Burners
Heat exchanger
Burners
Gas valves
Fan motor
Gas inlet
Page
Installation Manual
Introduction