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PLATE HEAT EXCHANGE ADAPTER
Plate heat exchangers, as fitted to most modern
combination boilers, are extremely efficient and compact,
allowing ever smaller boilers to be produced.
However, relatively small quantities of iron oxide (rust)
can block the waterways, causing the boiler to cut out
when in hot water mode. As little as 12 gm of rust can
cause a heat exchanger to fail. A central heating system
may contain several kg of loose rust, and therefore
failures are common.
If it is not practical to use a CP2 adapter, a power flushing
pump can still be used to remove rust and sludge from
the primary water side of a plate heat exchanger, after
removing it from the boiler.
If a plate heat exchanger has
BSP threaded connections, it is
easy to attach the flow and
return hoses of a power
flushing pump directly onto
the heat exchanger.
However, many plate heat exchangers have plain
punched hole water inlet / outlets, without BSP threaded
connections. In these cases the adapter can be used to
make the connection to the power flushing pump. ***
*** There are many different proprietary designs of plate heat
exchanger. It is not possible for Kamco to be aware of every variation
currently on the market, hence the adapters supplied by Kamco will fit
most plate heat exchangers, but cannot be guaranteed to fit all.
Issue: May 2023
Section F – Power Flushing Accessories
Plate heat exchanger adapters - instructions
Many combination boiler plate heat exchangers without
BSP threaded water inlet / outlet connections conform to
a general pattern whereby they have four holes 15
to18mm diameter, located at 155 x 40 mm centres.
There is generally a 5mm female threaded pillar at each
end so that the boiler connection manifolds may be
located and secured with a 5mm bolt when in normal
use. One pillar is usually centralised between the holes at
one end, and that at the other end is offset.
Kamco plate heat exchanger adapters (each kit consists of
two adaptor blocks) should be attached as shown in the
picture, using the M5 allen bolts supplied.
In some cases a further 8mm hole may need to be drilled
in the body of one adapter block, when the connection
threaded pillar is further offset than usual.
In this situation, 'G' type clamps may be used to ensure a
tight connection of the adapter blocks onto the heat
exchanger.
Each adapter block has two 3/4" BSP male threaded hose
connections, and the power flushing pump hoses should
be connected onto these fittings, one at either end.
Both will always be fitted on the same side of the heat
exchanger (see picture), but the choice of side will
depend on whether the primary water side, or the
domestic water side is to be flushed. ###
Whilst the plate heat exchanger adapters are generally
water tight, always place the heat exchanger in a water
proof tray or open container prior to switching on the
pump.
Circulate water only at first, and check for leaks prior to
adding any chemical to the power flushing pump.
In cases where the heat exchanger is heavily fouled, neat
HyperFlush can be poured into the exchanger and left to
soak for 24 hours before flushing with the pump.
### Note: The domestic water side of these heat
exchangers may generally be descaled without removing
the heat exchanger from the boiler casing.
Access to the domestic water circuit may be gained by
breaking into the cold water inlet pipe, and the hot water
pipe leading to the taps, underneath the boiler, and
connecting the flow and return hoses onto suitable BSP
fittings / threads.
Page F.10
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