John Wood Takagi - 110-310-510 User Manual
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WARNING
DO NOT set to 85°C (185°F) if you use
your water heater in a recirculation
system. This will cause damage to the
heater and void the warranty. (This
temperature setting is only available
on the 510 models).
DO NOT adjust the left bank of
DIPswitches. (For the 510 models).
Turn off the power supply to the water
heater before changing the DIPswitch
settings.
Only change the switches with the dark
squares. The dark squares indicate
which direction the DIPswitch should be
set to.
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Flow
The flow rate through the water heater is limited to a
maximum of 25 l/min (6.6 GPM (US)) for the 110, 30.3
l/min (8.0 GPM (US)) for the 310, and 37.8 l/min (10.0
GPM (US)) for the 510.
The temperature setting, along with the supply tempera-
ture of the water will determine the flow rate output of
the unit.
Please refer to the temperature vs. gallons per minute
charts on pg. 43 to determine the likely flow rates based
on your local ground water temperature and your desired
outlet water temperature.
Household Flow Rates
Appliance/Use
Flow Rate
l/min
GPM (US)
Lavatory Faucet
3.78
1.0
Bath Tub
15.2 - 37.8
4.0 – 10.0
Shower
7.5
2.0
Kitchen Sink
5.6
1.5
Dishwasher
5.6
1.5
Washing machine
15.2
4.0
Taken from UPC 2006
Based on the CAN/CSA P.7 test method for measuring
energy loss of gas-fired instantaneous water heaters, the
water heater is rated for litres per hour (l/hr) ((US) gallons
per hour (GPH)) or litres per minute (l/min) ((US) gallons
per minute (GPM)) for Natural Gas and Propane, when
raising the water temperature by 43C° (77F°) (from 14°C
to 57°C (58°F to 135°F)). See the following chart.
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Model
Unit of
Measure
Natural Gas
Propane
110
l/hr
681
681
l/min
11.35
11.35
GPH (US)
180
180
GPM (US)
3
3
310
l/hr
931
931
l/min
15.5
15.5
GPH (US)
246
246
GPM (US)
4.1
4.1
510
l/hr
954
954
l/min
15.9
15.9
GPH (US)
252
252
GPM (US)
4.2
4.2
Refer to the table on the left for typical household plumb-
ing fixture flow rates to determine what the water heater
can do in a household application.
Freeze protection system
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 sur-
rounding and/or outside temperatures drop below 2.5°C
(36.5°F).
For the 110, 310, & 510:
In any areas subject to freezing temperatures, freez-
ing 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 backflow 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 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 unit of water. Refer to pg. 29.
2. Disconnect power to your heater.
This will keep your unit from freezing and being dam-
aged.
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