Flow; Freeze Protection System - Takagi AT-KJr3U-IN Installation Manual And Owner's Manual

• The flow rate through the water heater is limited
to a maximum of 6.6 GPM (25 L/min) for the 110U
model, 8.0 GPM (30 L/min) for the 310U model,
and 10.0 GPM (38 L/min) for the 510U model.
• 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 charts on p. 60 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 minute (GPM) (liters
per minute (L/min)) for Natural Gas and Propane,
when raising the water temperature by 77 °F (43 °C)
(from 58 °F to 135 °F (14 °C to 57 °C)).
See the chart on the right.
• 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 air temperature inside the case or water in the heat
exchanger is less than 36.5 °F (2.5 °C).
• In any areas subject to freezing temperatures, the manufacturer highly recommends an indoor instal-
lation with an indoor model. In such an installation, freezing issues can 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 backflow preventer (sold separately)
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 water out of the unit. Refer to p. 46.
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

FREEZE PROTECTION SYSTEM

45
Page
Normal Operation
Household Flow Rates
Appliance/Use
GPM (US)
Lavatory Faucet 1.0
Bath Tub 4.0 – 10.0
Shower 2.0
Kitchen Sink 1.5
Dishwasher 1.5
Washing machine 4.0
Taken from UPC 2006
Model
Indoor
110U
Outdoor
Indoor
310U
Outdoor
Indoor
510U
Outdoor
Owner's Guide
Flow rate
L/min
3.8
15.2 - 37.8
7.5
5.6
5.6
15.2
Unit: GPM (L/min)
Flow rate
3.0 (11.4)
4.1 (15.5)
4.2 (15.9)