Lighting Instructions - Bosch 520-HN-N User Instructions

4.2

Lighting instructions

B 1. STOP! Read the previous safety information.
B 2. The gas valve must be shut off by putting the ON/
OFF switch to position OFF
minutes to clear out any gas. If you smell gas, STOP!
Follow "B" in chapter 4.1. If you do not smell gas, go
to the next step.
B 3. This water heater is equipped with a safety pilot
burner and an automatic ignition control system.
B 4. Set the ON/OFF button to the position ON
In this position, the water heater is ready to use.
Fig. 18
B 5. Open hot water tap to a flow rate above the
minimum activation rates listed in table 4. The
automatic ignition system first ignites the safety pilot
burner which then ignites the main burner in about 4
seconds.
B 6. The green LED indicator is on when the main
burner is on.
B 7. The pilot flame will extinguish a few seconds after
the burners come on. The burners will remain on until
the hot water tap is turned off.
Note: The 520 HN operates in two modes. See
SETTING THE WATER TEMPERATURE.
Note: On
i
existence of air in the gas supply
line and in the water line may
cause some ignition delay. In that
case, repeat the ignition process
until all the air has been purged.
6 720 644 942
. Wait five (5)
initial installation,
4.3 To turn off appliance
B Set the ON/OFF switch to the position OFF
.
Fig. 19
B Close installer supplied manual gas shutoff valve on
the supply line to the heater.
4.4 Adjusting the water temperature
The 520 HN has two knobs that regulate temperature.
One knob controls temperature by regulating water flow
through the heater. The other knob controls tempera-
ture by adjusting the gas supply to the burners.
1
Fig. 20
Power adjustment knob
1
2 Flow control knob
Flow control knob
The flow control knob (see Fig. 20 & Fig. 21) adjusts
temperature by adjusting flow capacity. See table 4 for
details.
Fig. 21
Operation instructions
.
2
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