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Part number 550-100-325/0419
117
AquaBalance
®
Series 2 Wall Mount Gas-fired Water Boiler – Boiler Manual
38 Maintenance (continued)
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 wash-
ing, 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.
Actions for disassembling of the
Domestic hot water flat plate heat
exchanger
Consider removing side panels as noted on page 111.
1. Disconnect the unit from the electrical power supply using the
switch and/or the special cut-off devices.
2. Close the valve of cold water inlet placed before the boiler inlet.
3. Release residual pressure in domestic hot water circuit in the
boiler by opening a hot water tap downstream of the boiler.
Wait until heat exchanger/boiler is cooled down
before proceeding. Water in brazed plate heat
exchanger may still be HOT!
Failure to do so can cause severe injury.
4. Close the valve of CH system supply (1) and return (5)
placed before the boiler connections.
Actions for chemical cleaning of
Domestic hot water circuit
1. Disconnect the unit from the electrical power supply
using the switch and/or the special cut-off devices.
2. Close the valve of cold water inlet placed before the
boiler inlet.
3. Release residual pressure in domestic hot water
circuit in the boiler by opening a hot water tap
downstream of the boiler.
4. Disconnect the piping from cold water inlet (4) and
domestic hot water outlet (2).
5. Connect the pipe fittings and hoses of the pump
for chemical cleaning to the cold water inlet (4) and
domestic hot water outlet (2).
6. Fill the pump tank with the de-scaling chemical that
is NSF approved.
7. Circulate the fluid within the domestic hot water
circuit by activating the pump switch.
8. The processing time must be chosen according to
the amount of scale deposits present in the heat
exchanger and however such time must always be
less than the maximum treatment time specified by
the manufacturer on the product data sheet.
9. At the end of the cleaning cycle, empty the pump
from chemical and recover the product in appropri-
ate containers for disposal.
10. Fill the pump with water and perform a washing
cycle in order to remove the chemical product still
present within the coils of the heat exchanger, recov-
ering the liquid in suitable containers for disposal.
11. Repeat the washing with water more than once if
necessary.
12. Disconnect the pipe fittings and hoses of the pump
for chemical cleaning from the cold water inlet (4)
and domestic hot water outlet (2).
13. Reconnect the piping to cold water inlet (4) and
domestic hot water outlet (2).
14. Open the valve of cold water inlet placed before the
boiler inlet.
15. Reconnect the unit to the electrical power supply
using the switch and/or the special cut-off devices
and turn it ON.
16. Check the correct operation of the boiler and func-
tionality of production of domestic hot water.
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