Ensbury LT 70 - 580
We reserve the right to make changes to dimensions and construction
7
edition 12.2020
Hamworthy Heating Limited – Dorset BH17 ONF
In
new installations
in particular, residue from grease, oxidized metal, and even copper microdeposits must be
removed.
In
renovated installations
, cleaning should focus on removing sludge and the products of corrosion formed
when the unit was last in operation.
There are two types of methods for cleaning and removing sludge: a high intensity approach that takes a few
hours and a slower, more gradual approach that takes several weeks. This first type of cleaning must be done
before connecting the new boiler
, and with the second type, a filter should be installed on the back of the boiler
to capture loosened deposits.
The cleaning performed prior to installation improves performance, reduces energy consumption, and
resists scaling and corrosion on the unit. A professional (water treatment) should carry out the cleaning.
Protecting the unit against scaling
Water naturally contains dissolved calcium ions and carbonates that cause scaling (calcium carbonate) to form.
To prevent excessive deposits, take precautions with regard to the
water used to fill the unit: TH < 10°f
Water must be added during the life of the boiler. The new water adds scaling to the water system.
The amount
of fill water plus the amount of make-up water added during the life of the unit should not be more than
three times the water capacity of the heating system.
Also, the hardness of the make-up water must be
controlled.
Make-up water: TH < 5 °f
Adding a large amount of untreated water always contributes a significant amount of scaling. To monitor this and
to detect problems,
a system water meter must be installed.
Failure to comply with these guidelines (such that the fill water plus the make-up water is more than three times
the water capacity of the heating system) requires a full cleaning (to remove sludge and scaling) to be performed.
Additional precautions are required for operation:
When the unit has a water softener, the equipment must be inspected on a regular basis in order to ensure
that it is not outputting chloride-rich water into the system. The concentration of chlorides must always
remain below 50 mg/l.
To prevent the build-up of calcium deposits (such as on exchange surfaces), the unit should be brought into
service slowly, starting by operating at a low power with high primary water flow.
When the tap water lacks the desired qualities,
water treatment is required
. The fill water must be treated,
and whenever new water is added, the make-up water must also be treated.
Installations with multiple boilers require all of the boilers to be brought up simultaneously at minimal power.
Doing this prevents the calcium in the water from depositing on the exchange surfaces of the first boiler.
When working on the unit, avoid draining it completely; only the required parts of the system are to be
drained.
The rules listed above are designed to minimize scaling on the exchange surfaces and thus to increase the life of
the boilers.
To optimize how the equipment operates, plan to remove its calcium deposits. This must be done by a specialized
company. Also, before putting the unit into service, verify that the heating system is not damaged (ex. leaks). If it
has excessive scaling, the unit's settings for operation and for water treatment must be adjusted.
Protecting steel and stainless-steel boilers against corrosion
Corrosion can affect the iron components used in boilers and heating systems, which is directly related to the
presence of oxygen in the water heater's water. Dissolved oxygen that enters the unit when it is being filled for the
first time reacts with the equipment materials and quickly disappears. Without refreshing the oxygen through
significant contributions of water, the unit might not experience any damage whatsoever.
However, it is important to follow the sizing rules and installation guidelines in order to prevent oxygen from
continuously flowing into the heating water. From these rules, we have:
Preferably an expansion vessel with a membrane rather than an open expansion vessel that allows direct
passage
Internal pressure with the unit of more than 1 bar cold
Remove leaky (permeable) components that are letting out more gas than as if they were sealed.
If the guidelines above are followed, the unit's system water has the proper characteristics to last a long time:
8.2 < pH < 9.5 with a water concentration of < 0.1 mg/l.
If there is a chance that oxygen could enter the unit, you must take additional precautions. Adding an oxygen
scavenger (ex. sodium sulphite) is highly recommended. We recommend directing any water treatment questions
to specialists, which can provide:
- The appropriate treatment based on the characteristics of the unit
- A monitoring agreement with a guarantee as to the results
For units in which
the water comes into contact with heterogeneous materials
, such as copper or aluminum,
appropriate treatment is recommended
in order to ensure that the unit will last. In most cases, this consists of
adding corrosion inhibitors (in the form of chemical solutions) to the unit. Referring to a water treatment specialist
is recommended.
Summary of Contents for Ensbury LT 70
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