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Part number 550-100-260/0520
133
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
Before servicing Brazed Plate Heat
Exchanger Assembly
1. Cool down boiler and brazed plate heat exchanger assembly.
The following procedure may be used to cool down boiler
and components. First follow the operating instructions on
page 101 to properly shut off gas supply, but not the power to
the boiler. Turn on a domestic hot fixture and allow cool water
to flow through boiler. Boiler will lock out on an Ignition
Fault but the internal circulator should continue to run
cooling down the internal components. Once components
are cooled down, turn off all electrical power going to the
boiler following the operating instructions on page 101. If
procedure is followed, continue on to #3.
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.
2. Shut down the boiler:
a. Follow “To Turn Off Gas to Appliance” instructions on
boiler and Operating instructions.
b. Close the boiler manual gas valve.
c. Only needed if cool down procedure in Step #1 was not
needed or followed.
3. Close the domestic cold water inlet isolation valve.
4. Release residual pressure in the domestic hot water circuit
in the boiler by opening a hot water tap downstream of the
boiler and drain the DHW components by opening the drain
valves.
5. Close the space heating valves Boiler Out (1) and Boiler In
(4) placed before the boiler connections.
6. Release residual pressure in boiler by operating relief valve
or opening boiler drain. Drain boiler by opening drain on
boiler in and boiler out.
Cleaning DHW and Brazed Plate Heat Exchanger
1 Boiler In
2 Domestic hot water outlet
3 Domestic cold water inlet
4 Boiler out
5 Gas inlet
6 Condensate tube
Removal of brazed plate heat exchanger
by loosening the two (2) screws.
Brazed plate heat exchanger removal for
cleaning
1. Remove the Brazed Plate Heat Exchanger from boiler
assembly by first removing the two (2) Allen Head bolts
with a 4mm Allen wrench, see Figure 119. Push brazed
plate back away from brazed plate manifolds clearing the
bolt bosses on the brazed plate from the manifolds. Then
slide the brazed plate up and to the left, removing it from
the boiler.
2. The treatment time must be chosen according to the
amount of scale deposits present in the brazed plate heat
exchanger. However, the amount of time must always be
less than the maximum treatment time specified by the
chemical manufacturer’s product data sheet.
The gas valve does NOT need to be removed
to replace brazed plate heat exchanger.
3. Brazed plate heat exchanger can be immersed in a chemical
cleaning bath.
4. At the end of the cleaning cycle recover the chemical product
in appropriate containers for disposal.
5. Flush the brazed plate with potable water in order to remove
the chemical product still present within the coils of the heat
exchanger, recovering the liquid in suitable containers for
disposal.
6. Repeat the rinsing with water more than once if necessary.
7. The cleaned brazed plate heat exchanger can now be
reinstalled.
e brazed plate heat exchanger must be
reinstalled in the same orientation.
Domestic water circuit on the Combi
(Back view shown)
4
3
2
1
6
5
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