Product specifications

Now connect the complete block to the
cold water inlet pipe and the hot water
outlet pipe on the boiler as shown in fig 5.
Fig 5.
Bring the cold mains water to the boiler in
22mm pipe. Fit the 22mm butterfly
isolation valve and connect to the 3.5 bar
pressure reducing valve.
Connect the hot water in 15mm pipe to the
mixed outlet (M) on the thermostatic mixer
valve.
fig 6.
Fit a 15mm Tee joint to the discharge
pipe connection from the T&P relief
valve on the boiler and make a
connection in 15mm pipe from the outlet
of the 6 bar cold water pressure relief
valve to this T joint as shown in fig 6.
Drain cock
The connection point for the ¼" BSPM
drain cock (item 7 in fig 1) on the UV3
manifold is opposite the connection
point for the thermostatic mixer valve.
See fig 3. Remove the ¼" BSPM black
plastic plug and fit the ¼" BSPM drain
cock onto the UV3 manifold.
Equal pressure cold water out (Optional extra kit)
Where an equal pressure cold water supply is required, there is a 22mm connection on the side of the UV3
manifold for this purpose. If this is not required, use the 22mm cap which is provided in the UV3 kit to blank off
this port.
Gas connection
Fit the gas union valve with loose part of union to boiler as shown in fig 5. Connect to 22mm gas supply.
Auxiliary (comfort loop) connection
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. A balancing valve
must be fitted in this circuit and if required an isolating valve can be fitted. Note that the return connection must
be the last connection on the heating circuit return pipe.
ATMOS MULTI Mk 2 version 2008
Page 26