Servicing The Heat Exchanger Of The Boiler Shell; Servicing The Plate Exchanger; Checking Accessories - geminox Merite ZEM 2-17 C Technical Instructions

2 - SERVICING THE HEAT EXCHANGER OF THE BOILER SHELL

The heat exchanger must be cleaned once the burn-
er has been disassembled (section 1 - page 7 -
chapter II - MAINTENANCE - SERVICING MANU-
AL).
- Remove the combustion chamber pipe including
the insulator,
- Sprinkle the heat exchanger with water. The wa-
ter is evacuated through the condensate evacua-
tion siphon,
- refit the combustion chamber pipe with its insula-
tor,

3 - SERVICING THE PLATE EXCHANGER

If the plate exchanger (item 25) must be replaced:
- close all the stop valves of the boiler,
- drain the boiler (refer to section 8 - page 11 -
chapter II - MAINTENANCE - SERVICING MAN-
UAL)
- remove the DHW sensor (item 28),
- remove the 4 screws (item e) securing the plate
exchanger to the primary and DHW flow/return
tubes of the boiler,
- fit the DHW sensor to the new plate exchanger,
- refit the plate exchanger,
Clean the filter (item c) and replace the
!
flat seals (item d) if necessary. Fit the
flow limiter (item a), the edge ring
(item b), filter (item c) and seals (item d)
as shown (fig. 6) on the DHW cold water
inlet (item 27) of the plate exchanger
(item 25).

4 - CHECKING ACCESSORIES

- Check that the safety and control devices (3 bar
safety valve, air bleed, safety control box, etc.)
are operating properly.
- Clean the condensate drain siphon and then fill it
with water.
- Also check that neither the installation nor the
boiler present any water or fuel leaks (leaks may
produce a risk for safety and shorten the
lifespan).
- refit the burner to the boiler shell,
• check the correct positioning of the sealing
rope and change it.
Ensure that the combustion chamber
!
pipe is fitted back in its initial position
before starting up the boiler again:
the combustion products may overheat
and destroy the combustion product
outlet at the level of the boiler shell.
Fig. 6
e
d
- When it is frequently necessary to add water to
maintain pressure in the installation, even though
no leaks have been discovered, perform an ex-
pansion vessel check (section 5 - page 10 -
chapter II - MAINTENANCE - SERVICING MAN-
UAL).
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MAINTENANCE
d
e
d
e
d
27
d
b
a
28
c
25