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7.11 Noise When Heater Is Running; Burners Do Not Operate Cleanly; Yellow Flames When Operating; Protecting The Environment - Bosch 330-PN-N Installation Manual

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28 | Protecting the environment

5. If the water has a high mineral content, the heat exchanger
may be scaled internally. This restricts the water path, causing
diminished water flow. Instructions for descaling the heat
exchanger are available at www.bosch-climate.us.

7.11 Noise when heater is running

1. Confirm adequate flow rate through the unit. With cold
supply shut off to the unit, disconnect hot outlet side to the
unit. Place a half gallon jug under hot outlet to catch water.
Open cold supply and measure flow rate out of the unit. With
temperature adjustment knob set all the way clockwise, the
flow rate should be close to 2gpm, filling the jug in 15 seconds.
With the temperature adjustment knob set all the way
counterclockwise, the flow rate should be close to 4gpm, filling
the jug in 7 seconds. If the flow rate is not adequate, inspect
and clean the inlet filter screen (see chapter 6.2).
2. Inspect the water path outside of the heater for
obstructions. Make sure all outlets (i.e. showerheads, faucet
aerators and whole house filters are clear of debris.
Restrictions in the water path can slow water flow through the
heat exchanger causing it to boil and make noise.
3. If the water has a high mineral content, the heat exchanger
may be scaled internally. This restricts the water path, causing
the water to boil resulting in noise and overheating.
Instructions for descaling the heat exchanger are available at
www.bosch-climate.us.
7.12 Burners do not operate cleanly; yellow flames
when operating
1. Verify gas type indicated in rating sticker located on right-
hand side of cover, coincides with the gas type you are using.
NG is a natural gas unit and LP is for liquid propane.
2. Gas pressure may be inadequate resulting in improper
combustion. Ensure gas pressure is in accordance with
manufacturer's specifications (see chapter 4.6). A gas
pressure reading is needed to proceed further. Contact your
original installer or a licensed gas technician to obtain this
reading.
3. For proper combustion at high elevations the inlet gas
pressure should be set at installation to the value shown in
table 6 on page 16 (while operating at maximum BTU). A gas
pressure reading is needed to proceed further. Contact your
original installer or a licensed gas technician to obtain this
reading.
4. Ventilation is not adequate. Ensure adequate combustion air
is being supplied to the unit in accordance with manufacturer's
specifications (see chapter 4.6).
5. Make sure the water heater is vented properly. Check for
proper draft and ensure venting is in accordance with
manufacturer's specifications (see chapter 4.7).
6 720 644 951 (2014/11)
6. The water heater has burners much like a furnace. It is
essential that they remain clean and are supplied with
adequate air for combustion. If the flames burn yellow or
orange, it is strongly recommended that the burners be
removed from the unit and cleaned. Once the burners are
removed, the fins in the top of the heat exchanger can be
accessed and brushed or vacuumed clean. Instructions to
remove burners are available at www.bosch-climate.us.
8
Protecting the environment
Packing
The packing box may be fully recycled as confirmed by the
recycling symbol
.
Components
Many parts in the heater can be fully recycled in the end of the
product life. Contact your city authorities for information about
the disposal of recyclable products.
Saving water resources:
▶ Make sure you close all the taps after any use. Avoid leaving
the taps dripping. Repair any leaking tap.
▶ Set the water heat to the temperature you want. This way
you have the precise water flow needed (mixing cold water
to regulate temperature will increase the water flow with
consequent waste of water).
For increased safety shut off the appliance from the main water
supply if your are staying away from home for a considerable
time.
At below freezing temperatures, disconnect the plumbing
connections to the heater and allow the heater to drain.
To prevent any freeze damage, introduce short bursts of
compressed air (20-40 psi) through these connections to
remove the residual water in the horizontal pipes and water
valve.
Follow instructions in chapter 5.5 to remove any additional
water remaining in the watervalve and heat exchanger.
330 PN

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