Freestyle 2 Series Manual page 117

FreeStyle
®
2
series
38 Maintenance
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 pipe fittings and hoses cold
water inlet (4) and domestic hot water outlet (2).
5. Connect the two hoses of the pump for chemical clean-
ing 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 exchanger and
however such time must always be less than the maxi-
mum 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 appropriate con-
tainers 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, recovering the
liquid in suitable containers for disposal.
11. Repeat the washing with water more than once if neces-
sary.
12. Disconnect the two 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 function-
ality of production of domestic hot water.
Part number 550-142-950/0122
-
wall mount gas fired water boiler
(continued)
–
boiler manual
Hot Water Can Scald!
y Consumer Product Safety Commission and some states
recommend domestic hot water temperature of 130°F or
less.
automatic mixing valve
y When installing an
and installation must comply with valve manufacturer's
recommendations and instructions.
y Water heated to a temperature suitable for clothes wash-
ing, dish washing and other sanitizing needs will scald and
cause injury.
y 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:
automatic mixing valve
y Install
standards. (If used).
y Use lowest practical temperature setting.
y 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:
y Boiler water (including additives) is practically non-toxic,
having a toxicity rating or class of 1, as listed in Clinical
Toxicology of Commercial Products.
y 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.
, selection
set according to those
117