Assembly And Installation - Chappee NXR3 Installation Manual

3. ASSEMBLY AND INSTALLATION

Caution : assembly and installation must be carried out by a qualified engineer.
3 . 1 Boiler room layout
Plinth (see fig. 2)
No special plinth is required for this type of boiler. A simple dry
base suffices. For information, we provide the dimensions of
this dry base (figure 2). For certain special installations, a
sound-proof plinth may be necessary. We recommend a
metal plinth resting on reachable antivibration pads.
Flat bars
width 150
Optional
sealing
Clearance (see fig.3)
The dimensions shown are minimal values which allow proper
access for assembly and maintenance operations.
No need to leave clearance above for cleaning purposes.
Fig. 3
Ventilation
Comply with statutory regulations for low and high ventilation
Connections to water supply
Connection to the heating system needs to be done according
to statutory regulations and trade practice.
Fuel supply
For oil and gas, comply with statutory rules and
recommendations, in particular with respect to safety rules.
Power supply
comply with regulatory prescriptions, in particular with res-
pect to earthing and its connection to the boiler (main
Fig. 2
switch...)
Boiler
Flue stack
size C L
A 0 daPa depression should be observed at exit of smoke box.
34 750 900
Comply with statutory regulations and trade practice.
35 920 1070
36 1090 1240
Please note that the efficiency of these boilers results in
37 1260 1410
relatively low flue gas temperatures.
38 1430 1580
Special care must be given to flue stack which must be air-
39 1600 1750
tight, heat-insulated and protected against degradation. One
of the actions to take is to line the duct. Tubing grade must
be compatible with the selected fuel.
It is advised :
• to keep the same cross-section as that of the boiler smoke
• to avoid short radius,
• to keep the number of bends to a minimum
• where possible, to slope connecting parts upwards,
• to provide a purging vessel as close to the boiler as
Water flow rate
The system must be designed to ensure a water flow rate, in
each boiler, comprised between 1/3 and 3 times the QN
nominal flow rate.
between :
Choice of burner
The burner should be chosen according to the boiler power
and furnace.
5
hood outlet,
towards chimney
possible.
QN =
Water flow rate allowed in each boiler must be comprised
PN kW x 0,86
45K
PN kW x 0,86
15K
PN kW x 0,86
and
5K
Ref. : CH - 1249 - A - 2