Connecting The Gas & Water - Benchmark Procombi A Series Installation & Servicing Instructions Manual

"X"
28/32/36 HE = 218 mm
"X"
12/15/20HE = 202mm
25/30/35HE = 218mm
"X"
Fig. 11
Fit the appropriate flashing plate to the roof and
insert the vertical flue terminal through the flashing
plate from the outside, ensuring that the collar on
the flue terminal fits over the flashing.
The fixing holes for the wall-mounting bracket/
fixing jig should now be drilled and plugged, an
appropriate type and quantity of fixing should be
used to ensure that the bracket is mounted se-
curely. Once the bracket has been secured to the
wall, mount the appliance onto the bracket.
IMPORTANT
The vertical flue terminal cannot be cut; therefore
it may be necessary to adjust the height of the
appliance to suit or use a suitable extension.
Connect the vertical flue assembly to the boiler
flue spigot using the 100mm clip, gasket & screws
(supplied), ensuring the correct seal is made. The
flue support bracket (supplied with the vertical flue
kit) can now be fitted.
If the vertical flue requires extension/s or addi-
tional bend/s, connect the required number of flue
extensions or bends (up to the maximum equiva-
lent flue length) between the boiler and vertical flue
assembly (see fig. 10).
Ensure that any horizontal sections of the flue
system have a minimum 1º; maximum 3º fall back
to the boiler (1º = 17mm per 1000mm).
NOTE
When cutting an extension to the required length,
you must ensure that the excess is cut from the
plain end of the extension (see fig. 8). Remove
any burrs, and check that any seals are located
properly.
You must ensure that the entire flue system is
properly supported and connected.
10
4.6 CONNECTING THE GAS AND WATER KIT
The appliance is supplied with an accessory pack
that includes service valves. The service valves
are of the compression type. The accessories
pack contains sealing washers etc., for use with
the service valves.
When connecting pipe work to the valves, tighten
the compression end first then insert the sealing
washers before tightening the valve to the appli-
ance.
NOTE
It will be necessary to hold the valve with one
spanner whilst tightening with another.
4.6.1 GAS (fig. 12)
The appliance is supplied with a 15mm service
valve, connect a 15mm pipe to the inlet of the
valve and tighten both nuts.
NOTE
It will be necessary to calculate the diameter of the
gas supply pipe to ensure the appliance has an
adequate supply of gas.
4.6.2 FLOW & RETURN (fig. 12)
The appliance is supplied with 22mm service
valves for the flow and return connections, con-
nect a 22mm pipe to the inlet of each valve and
tighten both nuts.
NOTE
Depending on system requirements, it may nec-
essary to increase the size of the flow & return
pipe work after the service valve connections.
4.6.3 COLD WATER INLET (fig. 12)
The appliance is supplied with a 15mm combined
stopcock, connect a 15mm pipe to the outlet
connection and tighten both nuts.
4.6.4 HOT WATER OUTLET (fig. 12)
The appliance is supplied with a 15mm outlet con-
nection, connect a 15mm pipe to the outlet con-
nection and tighten both nuts.
A - safety valve outlet
B - flow
C - DHW outlet
D - gas
E - return
F - DHW inlet
Fig. 12
F
E
D
C
B
A