gledhill TORRENT DIRECT Design, Installation & Servicing Instructions page 47

In situations where scale inhibitors have not been fi tted and the hot water service
has deteriorated a Torrent can be descaled very easily with equipment available from
Gledhill.
You can now do the whole job easily and effi ciently on site - and do it under the
hour.
The operation is carried by a VORTEX DECALOMAT-3 Descaling Unit which removes
the scale chemically. By simply replacing the thermostatic mixing valve on the hot
water outlet with the special adaptor valve supplied, descaling solution is pumped
through the secondary coil (see fi gure 7). After approximately 45 minutes the job is
done and the mixer valve is put back in place. The solution is made up of 2kg of either
Sentinel ScaleClean or Fernox DS-3 descaling powder dissolved in 20 litres of water
(preferably warm but not exceeding 70
colour indicator which changes as the active ingredients are used up.
TO DESCALE TORRENT USING DECALOMAT-3
1. Before descaling turn the boiler off and run the hot water tap until the thermal
store is below 40 o C.
2. Turn off the mains water supply at stop tap supplying the Torrent.
3. Open a hot tap on the hot water system.
4. Break the three unions securing the Oventrop mixing valve to the Torrent and
remove the Oventrop mixing valve making sure a container is in place to collect
spillage.
5. Attach the adaptor to the Torrent - two unions and washers.
6. Close all hot taps on the DHW system.
TO CHARGE DECALOMAT-3
7. Unscrew the large cap adjacent to the carrying handle.
8. Make sure that the hoses are connected together with the brass nipple.
9. Partly fi ll the Decalomat-3 with 20 litres of Sentinel ScaleClean solution or Fernox
DS-3 solution (the solution should be 2kg of powder dissolved in water).
Note: This solution is ACIDIC and MUST be handled with CARE. It is a wise
precaution to do the mixing, fi lling and emptying outside the premises.
Observe the manufacturers handling instructions.
10. Replace the fi lling cap on the Decalomat-3.
11. Break the joint between the hose (keeping both hoses above the level of the
Decalomat-3) retaining the brass joining piece.
12. Attach the hoses to the adaptor (ensure that the unions are fi nger tight on the
¾" BSP male connectors to the adaptor).
13. Loosen the fi lling cap on the Decalomat-3 to allow carbon dioxide formed in the
descaling process to escape.
14. Plug the Decalomat-3 to a 240V 50Hz electric supply. The pump in the Decalomat
will now circulate the coloured descaling solution through the heat exchanger
coil of the Torrent. Depending on the degree of scale formation within the coil,
the following may be observed:-
o
C). The powders are manufactured with a
Page 47
SERVICING
WITH SENTINEL SCALECLEEN
1. The red solution will be observed in one of
the transparent plastic tubes, foam and an
orange/yellow liquid may be seen in the
other tube.
2. Flow of the red liquid may initially be
intermittent due to:
a. Gas formation in the coil as the Sentinel
ScaleCleen attacks the scale.
b. Degree of blockage - this stage may exist for
about half an hour.
3. Continuous flow will begin with the red
Sentinel ScaleCleen solution in one pipe and
a foaming solution in the other.
4. If after some time, the colour in both pipes
has turned to yellow (no gas bubbles are
observed), the Sentinel ScaleCleen is now
exhausted and requires changing.
5. When the solution in both tubes remains red
or orange and no gas bubbles are observed,
the coil has been descaled.
WITH FERNOX DS-3
1. The yellow solution will be observed in one
of the transparent plastic tubes, foam and a
greenish blue liquid may be seen in the other
tube.
2. Flow of the yellow liquid may initially be
intermittent due to:
a. Gas formation in the coil as the Fernox DS-3
attacks the scale.
b. Degree of blockage - this stage may exist for
about half an hour.
3. Continuous fl ow will begin with the yellow
Fernox DS-3 solution in one pipe and a
foaming solution in the other.
4. If after some time, the colour in both
pipes has turned to green (no gas bubbles
are observed), the Fernox DS-3 is now
exhausted and requires changing.
5. When the solution in both tubes is still yellow
and no gas bubbles are observed, the coil has
been descaled.
TO REMOVE DECALOMAT-3
1. Unplug Decalomat-3 from electrical supply.
2. Tighten the fi lling cap on the Decalomat 3.
3. Remove the two hoses from the adaptor.
4. Join the hoses with brass connector piece.
5. Remove adaptor.
6. Replace Oventrop mixing valve - ensuring
that it is the correct way round.
7. Open a hot tap - preferably to a porcelain
sink.
8. Turn on the mains water supply to Torrent.
9. Allow the system to fl ush via the open hot
tap for some minutes, then fl ush out system
at each hot tap.