Black+Decker BD-07-DWH, Instruction Manual

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13
EN
deny any warranty claim regarding damage suffered due to use in water conditions that are not
in accordance with the table below. The water must be treated, and the heater flushed regularly
when this product is installed in an area that is known to have hard water that causes scale build-
up to prevent damage to the heat exchanger and heating elements. We recommend that a water
treatment device or water softener should be installed to maintain optimal performance of the
water heater in hard water areas.
Chart for Recommended Water Quality levels
pH Total
Dissolved
Solid (TDS)
Free
CO2
Total
Hardness
Aluminum Chloride Copper Iron Manganese Zinc
6.5
-
8.5
Up to
500
mg/L
Up to
500
mg/L
Up to
200
mg/L
Up to
0.2
mg/L
Up to
250
mg/L
Up to
1.0
mg/L
Up to
0.3
mg/L
Up to
0.05
mg/L
Up
to 5
mg/L
11. Care and Maintenance
To ensure maximum performance of your water heater and to reduce the risk of a water leak, we
recommend the following maintenance:
• The water heater has minimally required maintenance procedures. Periodic inspections and
tests are always recommended for signs of damage or failure. Any damage, cracks, leakage
or weakness should be addressed and fixed immediately. Do not over tighten any of the
connections. Over tightening the connection points could cause severe internal damage to
the unit.
• Remember that water heated at higher temperatures produces scale buildup much faster
than at lower temperatures. Having manual shut-off/maintenance valves installed on the inlet
and outlet of the water heater will allow access to flush the unit with a descaling solution. We
recommend routine maintenance once a year or once every six months if the water supply
has an unusually high level of mineralization (hard water)
• Clean the pre-filter on the inlet water side once every six months. Wash lightly to remove any
debris.
When any form of maintenance is carried out on the water heater or the home’s plumbing system
that may introduce air into the plumbing pipes, it is crucial to power off the water heater and purge
the air out of the lines before allowing the unit to power up.
FAILURE TO DO SO COULD RESULT IN PERMANENT DAMAGE TO THE HEATING ELEMENT
AND VOID YOUR WARRANTY.
When air is introduced into the plumbing system, follow the steps below to ensure the unit can
safely resume operation.
1. Shut off all power connections to the unit at the circuit breaker on the main electrical panel.
2. Perform the maintenance or servicing tasks.
3. Open one or more hot water faucets and allow water to run through the unit for several