Flow; Freeze Protection System - Takagi 110 Indoor (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 110 (T-KJr2) model, 8.0 GPM
for the 310 (T-K4) model, and 10.0 GPM for the 510 (T-D2)
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. 54 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.
110 Indoor
Model
(T-KJr2-IN)
GPH/GPM GPH GPM
Natural Gas 172 2.9
Propane 184 3.1
• 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 freeze protection thermostat senses air temperature below
36.5 °F (2.5 °C).
• For the 110 Indoor (T-KJr2-IN), 310 Indoor (T-K4-IN), and 510 Indoor (T-D2-IN) models:
• 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 only occur if cold air enters
through the venting into the heat exchanger, whether by negative pressures within the installation loca-
tion 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 manufac-
turer 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. 40.
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

110 Outdoor 310 Indoor
(T-KJr2-OS) (T-K4-IN)
GPH GPM GPH GPM
180 3.0 244 4.1
179 3.0 250 4.2

FREEZE PROTECTION SYSTEM

39
Page
Normal Operation
Household Flow Rates
Appliance/Use Flow rate GPM
Lavatory Faucet
Bath Tub
Shower
Kitchen Sink
Dishwasher
Washing machine
Taken from UPC 2006
310 Outdoor 510 Indoor
(T-K4OS) (T-D2-IN)
GPH GPM GPH GPM
242 4.0 252
249 4.2 256
Owner's Guide
1.0
4.0 – 10.0
2.0
1.5
1.5
4.0
510 Outdoor
(T-D2-OS)
GPH GPM
4.2 255 4.3
4.3 255 4.3