6 720 608 032
Protecting the environment
23
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. To descale the heat
exchanger,
consult
service
bulletins
on
www.boschhotwater.com.
6.12 Burners do not burn cleanly, yellow
flames when operating
• 1. Verify gas type indicated in the rating sticker
located on the heater's right hand side, coincides
with the gas type you are using. NG is a natural gas
unit and LP is for liquid propane (see chapter 2.2).
• 2. Gas pressure may be inadequate resulting in
improper combustion. Ensure gas pressure is in
accordance with specifications in the installation
manual. A gas pressure reading is needed to
proceed further. Contact your original installer or a
local certified gas technician to obtain this reading.
See chapter 3.9.
• 3. For proper combustion at high elevations the inlet
gas pressure should be set at installation to the
values in table 3 on page 11 (while operating at
maximum BTU). A gas pressure reading is needed to
proceed further. Contact your original installer or a
local certified gas technician to obtain this reading.
• 4. Ventilation is not adequate. Ensure adequate
combustion air is being supplied to the unit in
accordance with requirements in the installation
manual. See chapter 3.6.
• 5. Verify the water heater is vented properly. Ensure
the venting is in accordance with requirements in the
installation manual. See chapter 3.7.
• 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. Consult service bulletins on
www.boschhotwater.com for removing/cleaning the
burners.
7 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:
B
Make sure you close all the taps after any use. Avoid
leaving the taps dripping. Repair any leaking tap.
B
Define 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 4.5 to remove any
additional water remaining in the watervalve and
heat exchanger.
