Picture for wall frame and
pipework assembly kit
Assembly instructions for
wall frame and pipework
assembly kit
Assembly instructions
using loose components
4. Auxiliary (comfort loop) connection
The auxiliary or towel rail connection is
blanked off on the boiler with a
hexagonal chrome plug. If this option is
required, take the 15mm pipe from Bag 2
with a 15mm x ½” bsp male threaded
compression fitting and a union. Remove
the chrome plug (take care as residual
water sometimes dribbles out) and fit the
compression fitting. Connect to the towel
rail flow union on the valve plate.
If this is not required, simply discard the
pipe or use elsewhere.
The auxiliary or towel rail connection is
blanked off on the boiler with a
hexagonal chrome plug. If this circuit is
required, remove this plug and connect
15mm copper pipe as a flow to the towel
rail circuit. An isolating valve may be
fitted for convenience. Note that the
return connection must be the last
connection on the heating circuit return
pipe.
5. Hot water and Secondary hot water return
From Bag 1 take the 15mm pipe
assembly with the thermostatic mixing
valve. Assemble the pipework from the
cold water manifold 15mm port, and
connect to the 15mm hot water return
valve on the valve plate. Loosely tighten
joints.
If there is no secondary hot water
circulation system, TURN OFF this valve
fully as it will not be required. To be
absolutely certain of no future leakage,
we recommend that a 15mm pipe with a
soldered end cap is used to blank off this
port.
Take the short 15mm hot water inlet
pipe and the 15mm compression elbow.
Connect from the boiler to the
thermostatic mixing valve (port W).
The upper right 15mm connection on the
UV4 manifold is used for the following
purposes :-
1) Feed to the central heating filler loop
or connector.
2) Cold feed to the hot water
thermostatic mixing valve.
3) Return port for a secondary hot
water re-circulation system where
required (optional)
4) Connection to the hot water
expansion vessel. There must be no
valve between the expansion vessel
and the UV4.
6. Hot water supply
Fit the longer 22mm hot water outlet pipe
from the 15mm port M to the hot water
out valve on the valve plate. Don’t forget
the washer.
At this point all hot and cold water
connections are in place, and final
tightening of all unions and connectors
can be done.
Take the thermostatic mixing valve.
Connect cold water inlet to rear port
marked K. Connect the 15mm hot from
the boiler to the side port marked W.
Connect the hot water out (marked M =
Mixed) to the domestic hot water supply.
Supply size can be 15mm or 22mm,
depending on the load, but 22mm will be
required for more than one bathroom.
ATMOS MULTI Mk 2 version 2004
Page 24
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