Connections & Filling - Keston Combi 30 Installation And Servicing Instructions

BACK
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 (black handle) and
copper tail provided in the hardware pack to the threaded
boss connection provided at the lower rear of the boiler.
2. Connect the CH rtn. valve (black handle) and copper tail.
3. If connecting the boiler to heating loads in excess of
60,000 Btu/h, 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) and copper tail
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.
3. Fit the filling loop provided between the DHW inlet valve and
the CH return valve
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 info refer to "Gas Supply" on page 8.
sAFETy VALVE DRAIN
The safety valve connection, located at the bottom right-hand
side of the boiler, comprises a 15mm diameter stub pipe.
The Installer to provide a compression joint on the end of the
stub pipe. This assists with pipe removal when servicing.
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.
Note that all isolation handles
are shown in the open postion.
24
INSTALLATION
CH Flow
DHW
Outlet
Gas
Supply
Black
Handle
Yellow
Handle
Handle
Filling
Loop
FILLINg
FILLINg
IMpORTANT - when filling:
When filling, there may be a slight water leak from the air vent
therefore electrical connections should be protected.
1. Ensure Filling Loop is connected
2. Ensure dust cap on auto air vent is slackened off (refer to
Frame 66).
3. Check all isolation handles on all water connections are in
the open position.
4. Open handle  on the filling loop, then slowly open handle
 until pressure gauge reads between 1 to 1.5 bar.
5. Once pressure gauge dial reads between 1 - 1.5 bar turn the
filling loop isolation valves back to the closed position.
6. Disconnect filling loop at the LH side, ensuring top hat
washer is retained and screw on blanking cap.
7. Connect extended blanking cap and top hat washer to filling
loop pipe.
Note. Fully open all DHW taps and ensure water is
flowing freely. Once satisfied close all taps.
Handle 
(Shown in closed position)
DHW
Inlet
CH
Return
Blue
Black
Handle
Black
Handle
Keston Combi -
Note. The domestic hot water flow rate
is automatically regulated to a maximum
of 12.4 l/m (2.8 gpm)
Handle 
(Shown in closed position)
Safety
Drain
Valve
Installation and Servicing