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Part number 550-100-260/0520
131
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
Cleaning DHW and Brazed Plate Heat Exchanger
Procedure for chemical cleaning of
DHW circuit
Carefully read and follow the instructions contained.
Chemical cleaning and maintenance must be carried out by
professionally qualified personnel, in compliance with the current
regulations and according to the manufacturer’s instructions.
Do not carry out any operation on the sealed control parts.
Before carrying out any cleaning or maintenance operation,
disconnect the unit from the electrical power supply using the
switch and/or the special cut-off devices.
The disposal of chemicals and residues of chemical cleaning
should be carried out in an appropriate manner, in accordance
with current standards.
Domestic water for hot water production harder than 7 grains must
be treated before entering combi boiler to avoid scaling internal
combi boiler components.
Prolonged boiler operation with untreated water and/or hard
water will reduce the production of domestic hot water. Cleaning
the brazed plate and combi components may restore the
performance of hot water production. Use only NSF approved
chemicals that are safe for consumption and suitable for cleaning
the combi components - stainless steel 316 (brazed plate) and
brass (water manifolds and temperature sensor). Check chemical
manufacturer’s instructions and guidelines.
This procedure is intended as a guideline for restoration of the
functionality of domestic hot water production.
Boiler connections for cleaning domestic
water circuit
Hot Water Can Scald!
Consumer Product Safety Commission and some states
recommend domestic hot water temperature of 130°F
or less.
When installing an automatic mixing valve, selection
and installation must comply with valve manufacturer’s
recommendations and instructions.
Water heated to a temperature suitable for clothes
washing, dish washing and other sanitizing needs will
scald and cause injury.
Children, elderly, infirm, or physically handicapped
persons are more likely to be injured by hot water. Never
leave them unattended in or near a bathtub, shower or
sink. Never allow small children to use a hot water faucet
or draw their own bath. If anyone using hot water in
the building fits this description, or if state laws or local
codes require certain water temperatures at hot water
faucets, take special precautions:
Install automatic mixing valve set according to those
standards. (If used).
Use lowest practical temperature setting.
Check water temperature immediately after first heating
cycle and after any adjustment.
Studies have indicated that dangerous bacteria
can form in potable water distribution systems
if certain minimum water temperatures are not
maintained. Contact local health department for
more information.
These single wall heat exchangers comply with National
Standard Plumbing Code, provided that:
Boiler water (including additives) is practically non-
toxic, having a toxicity rating or class of 1, as listed in
Clinical Toxicology of Commercial Products.
Boiler water pressure is limited to max. 30 psig by
approved water relief valve.
Before you start, check the compatibility of
chemical cleaning product with the material
of the heat exchanger and its components.
The material of domestic hot water circuit is
stainless steel class AISI 316. The
brazed plate
and water manifolds and temperature sensor
are brass.
1 Boiler In
2 Domestic hot water outlet
3 Domestic cold water inlet
4 Boiler out
5 Gas inlet
6 Condensate tube
5
6
123
4
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