John Wood Takagi - 320H-520H - Manual (Page 28)

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NORMAL OPERATION
General
1. Open a hot
water tap. 2. Mix cold water
with the hot to
get the correct
t e m p e r a t u r e
water.
3. Close the hot
water tap.
Flow rate to activate the 520H:
1.9 l/min (0.5 GPM (US))
Flow rate to keep the 520H running:
1.5 l/min (0.4 GPM (US)) •
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Hot Water temperatures over 52°C (125°F)
can cause severe burns instantly or death
from scalding.
The outlet hot water temperature of
the water heater is factory set at 49°C
(120°F).
Feel the water temperature before bath-
ing or showering. •
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Temperature Settings
On The 520H
On the 520H, changing the temperature setting can be done
simply by using the 3-digit 7-seg. LED, and the “Increase" &
“Decrease" buttons on the computer board (remote control-
ler is not required)
The 520H will display the set temperature
on the 3-digit 7-Seg. LED on the computer
board. This LED is visible through a small
window on the unit’s front cover.
If the remote controller is installed, refer to
the remote controller Installation Manual
included with the remote for setting tem-
perature.
3 digit 7-
Seg. LED
Computer
board
Decrease
button
Increase
button
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Temperatures available (°C)
38 40.5 43 46 49 52 57 60 63 65.5 68 71 74 77 79 85
Temperatures available (°F)
100 105 110 115 120 125 135 140 145 150 155 160 165 170 175 185
The temperature has been preset at the factory to 49°C
(120°F).
If temperatures other than the ones listed above are
required, the remote controller can provide a couple
more temperature options. Refer to pg. 6 for a list of
available temperatures on the remote controller.
When the flow sensor detects flow higher than 1.9 l/min
(0.5 GPM (US)), a single LED tick mark on the left side
of the 3-digit 7-Seg. LED will blink to indicate that the unit
is working.
Example: tick mark next to the 110°F set tem-
perature display
How to set the hot water temperature of the water heater
Take off the water heater’s front cover.
Press the either “Increase" button or the “Decrease" but-
ton on the computer board to increase or decrease the
set temperature. The 3-digit 7-Seg. LED will display the
available set temperatures.
Scroll to the desired set temperature.
Set temperature (Example 110°F)
DO NOT set to 85°C (185°F) if you use
your 520H water heater in a recirculation
system. This will cause damage to the
heater and void the warranty.
Flow
The flow rate through the 520H is limited to a maximum
of 34 l/min (9.0 GPM (US)).
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
chart on pg. 37 to determine the likely flow rates based
on your local ground water temperature and your desired
outlet water temperature combination.
Based on the CAN/CSA P.7 test method for measuring
energy loss of gas-fired instantaneous water heaters, the
520H is rated for 1079 l/hr (285 GPH (US)) or 18 l/min
(4.8 GPM (US)) for Natural Gas and for Liquid Propane,
when raising the water temperature by 43C° (77F°) (from
14°C to 57°C (58°F to 135°F)).
Refer to the chart to the right for typical household
plumbing fixture flow rates to determine what the 520H
can do in a household application.
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