Flow; Freeze Protection System - Takagi T‐KJr2‐IN Installation Manual And Owner's Manual

• The flow rate through the water heater is limited to a
maximum of 6.6 GPM for the T‐KJr2‐IN/OS, 8.0 GPM for
the T‐K4‐IN/OS, and 10.0 GPM for the T‐D2‐IN/OS.
• The temperature setting, along with the supply
temperature of the water will determine the flow rate
output of the unit.
• Please refer to the temperature vs. gallons per minute
chart on p. 48‐49 to determine the likely flow rates
based on your local ground water temperature and your
desired outlet water temperature.
• Based on the United States Department of Energy method of testing water heater output, the water
heater is rated for gallons per hour (GPH) or gallons per minute (GPM) for Natural Gas and Propane,
when raising the water temperature by 77°F (from 58°F to 135°F). See the diagram below.
T‐KJr2‐IN
GPH GPM GPH GPM GPH GPM GPH GPM GPH GPM GPH GPM
Natural Gas 180
Propane 180
• Refer to the table to the top right for typical household plumbing fixture flow rates to determine
what the water heater can do in a household application.
• This unit comes equipped with heating blocks to protect it against damages associated with freezing.
• For this freeze protection system to operate there has to be electrical power to the unit. Damage to
the heat exchanger caused by freezing temperatures due to power loss is not covered under the
warranty. In cases where power losses can occur, consider the use of a backup power supply.
• The freeze protection system will activate when the surrounding and/or outside temperatures drop
below 36.5°F (2.5°C).
• For the T‐KJr2‐IN, T‐K4‐IN, and T‐D2‐IN models:
In any areas subject to freezing temperatures, the manufacturer highly recommends an
•
indoor installation with an indoor model. In such an installation, freezing issues can only
occur if cold air enters through the venting into the heat exchanger, whether by negative
pressures within the installation location or by strong outside winds.
• The manufacturer also highly recommends the use of a back flow vent damper to minimize
the amount of cold air entering through the exhaust venting when the water heater is off.
• It is the installer's responsibility to be aware of freezing issues and take all preventative measures.
the manufacturer will not be responsible for any damage to the heat exchanger as a result of freezing.
• If you will not be using your heater for a long period of time:
1. Completely drain the unit of water. Refer to p. 36.
2. Disconnect power to your heater.
This will keep your unit from freezing and being damaged.
Only pipes within the water heater are protected by the freeze protection
system. Any water pipes (hot or cold) located outside the unit will not be
protected. Properly protect and insulate these pipes from freezing.
CAUTION
FLOW
T‐KJr2‐OS
3.0 180 3.0
3.0 180 3.0
FREEZE PROTECTION SYSTEM
35
Appliance / Use
Lavatory Faucet
Bath Tub
Shower
Kitchen Sink
Dishwasher
Washing machine
Taken from UPC 2006
Taken from UPC 2006
T‐K4‐IN T‐K4‐OS
246 4.1 246 4.1
246 4.1 246 4.1
│
Page
Normal Operation
Household Flow Rates
Flow Rate (GPM)
1.0
4.0 – 10.0
2.0
1.5
1.5
4.0
T‐D2‐IN T‐D2‐OS
252 4.2 252 4.2
252 4.2 252 4.2