Water Connections - Benchmark Procombi Exclusive 24 Installation & Servicing Instructions Manual

22 CONNECTIONS & FILLING
NOTES.
Ensure all boss blanking plugs are removed before connecting hardware. Each valve must be fitted to the correct boss as shown
in the picture.
Ensure each union is fitted with fibre seals provided.
Do not subject any of the isolating valves to heat as the seals may be damaged.
WATER CONNECTIONS CH
1. Connect the CH flow service valve provided in the
hardware pack to the threaded boss connection
provided at the lower rear of the boiler.
2. Connect the CH return valve (black handle).
3. If connecting the boiler to heating loads in excess of
60,000 Btu/h (17.5kW), connecting flow and return
heating systems pipework must be sized in 28mm
diameter at the point of pipe connection to the
boiler tails. Use 22mm x 28mm pipe adaptors as
appropriate.
WATER CONNECTIONS DHW
1. Fit the DHW inlet service valve (blue handle) to the
threaded boss connection ensuring the seal provided is
correctly located.
2. Fit the DHW outlet pipe tail to DHW outlet connection,
ensuring the seal provided is correctly located.
GAS CONNECTION
IMPORTANT. The gas service cock is sealed with a non-
metallic blue fibre washer, which must not be overheated when
making capillary connections. Refer to Frame 1 for details of the
position of the gas connection.
For additional gas supply information refer to "Gas Supply" on
page 10.
SAFETY VALVE DRAIN
The safety valve connection, located at the bottom right-hand
side of the boiler, comprises a 15mm diameter stub pipe.
N.B. Use a compression fitting when connecting to the safety
valve drain pipe to facilitate replacement of the safety valve if
required.
The discharge pipe should be positioned so that the discharge
of water or steam cannot create a hazard to the occupants of
the premises or damage the electrical components and wiring.
Pressure Relief Valve
Drain Connection
15mm elbow
or fittings
(not supplied)
28
INSTALLATION
CH Flow
Black
Handle
Pressure Relief Valve
Drain Pipe
FILLING
IMPORTANT - when filling:
A. Ensure the dust cap on air vent
located at the rear of the pump
chamber is slightly unscrewed.
B. When filling, there may be a slight
water leak from the air vent therefore
electrical connections should be
protected.
CH -
1. Ensure that the CH isolating
handles are open.
2. Fill and vent the system. Refer to
Frame 2 for setting pressure.
DHW -
1. Fully open all DHW taps and ensure
that water flows freely from the.
2. Close all taps.
note.
The DHW flow rate is automatically regulated to a max:
24 = 9.9 l/m (2.2 gpm)
30 = 12.4 l/m (2.8 gpm)
35 = 14.5 l/m (3.2 gpm)
DHW Outlet
Gas Supply
DHW Inlet
Yellow
Handle
Gas Pressure
Test Point
Procombi Exclusive -
Dust Cap
Note that all isolation
handles are shown in the
open postion.
CH Return
Safety
Blue
Drain
Handle
Valve
Black
Handle
Installation and Servicing