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GAS CONNECTION
4.5
Refer to Figure 12
Connect the gas supply pipe to the gas service cock. It is recommended
that a minimum of 22 mm diameter OD copper pipe be used to within
1000 mm of the gas service cock.
For full rate, operate CBX appliances in DHW mode.
PRESSURE RELIEF VALVE CONNECTION
4.7
The safety valve is located at the bottom RHS of the appliance. Connect
the copper tail provided, to the safety valve outlet, and then connect a
discharge pipe of not less than 15 mm diameter copper to the tail. The
pipe should be positioned so that the discharge of water or steam can be
noticed, but cannot create a hazard to the occupants of the premises or
damage electrical components or wiring.
AIR/FLUE DUCT INSTALLATION
4.8
For correct flue installation please refer to the installation instructions
that are provided with the individual flue kit as described in sections
2.5 - 2.7.
a)
Measure the required flue length as shown in Figure 14. Refer to
section 2.5 to determine whether any extension kits are required.
Installations using only the standard ducts or standard ducts with
straight extensions are described in this section. Installation
instructions for all other flue systems are included in the various
flue kits.
b)
Ensure that all (inner and outer tube) sealing rings are provided and
assemble the air/flue ducts as shown in the flue instructions.
c)
Construct the correct flue length by building the flue out from the
appliance.
Ensure that the flue and air seals are correctly fitted before assembly
and that each section is fully engaged.
13
CONDENSATE CONNECTIONS
CONDENSATE CONNECTION
4.6
Refer to Figure 13
Connect preferably a 22 mm plastic push fit or adhesive overflow pipe to
the condensate outlet. It should be piped to drain, preferably within the
building, maintaining a continuous 2° fall away from the appliance. Note;
if an additional “U” trap is fitted between the appliance and the
discharge point, then a visible air break is necessary between the
appliance and trap, because a trap is already provided within the
appliance. 32 mm pipe should be used for external pipe work, or if the
appliance is installed in a garage. If the drain is routed externally to a
drain or soak away, then the external length should be kept as short as
possible and not exceed 3000 mm. Protection from freezing in cold
weather conditions is also advisable. Ensure that the condensate
discharge system complies with any local regulations in force.
In exceptional circumstances, such as when a boiler is installed in a
basement without drainage, it may be necessary to install a condensate
pump to carry condensate up to ground/drain level. Such products are
available from Grundfos Pumps Ltd on: 01525 850000 and Pump House
on: 0115 922 2211.
CONDENSATE DRAIN
MUST BE
≥
Ø22
W
A
STE ST
A
C
K
CONDENSATE DRAIN
MUST BE
≥
Ø22
EXTERNAL PIPE
MUST BE
>
Ø32mm
SINK WASTE
2.5º
2.5º
The flue length is measured from the centreline of
the appliance flue outlet to the inside of the external
wall-sealing ring. In most cases it will be possible to
achieve the required flue length without cutting the
ducts, however where necessary the plain ends of
the extension ducts may be cut. Never cut the
swaged end, and always ensure that the cut is square
and free of burrs or debris.
NOTE IT IS ESSENTIAL THAT THE TERMINAL IS
FITTED THE CORRECT WAY UP
See flue kit Instructions (i.e. rain shield at the top).
14
MEASURING THE EXACT FLUE LENGTH
WALL
FAN OUTLET
EXTERNAL
Dia. 60mm
L
TOTAL FLUE LENGTH
FROM OUTLET CENTRE
TO OUTSIDE WALL FACE.
= LENGTH
L
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751030 MANUAL (NEW) 21/9/10 08:43 Page 41
