DORCHESTER DR-FC 120, Installation, Comissioning And Maintenance Instructions

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Installation
32 Instruction manual DR-FC
3
is
Practical example of parallel flue gas discharge
Example
The figure shows a DR-FC 30 installation. This has to be fitted with a 10 m
parallel pipe of 100 mm diameter, and eight 90 degree bends. The configuration
must be checked for compliance with the requirements stated in the table.
Water heater with parallel flue gas discharge material
The longest pipe must be used to check the maximum length. In this case, the
chimney pipe is the longest. This is 10 metres. This 10 metres is the sum of pipe
sections 1, 2, 3, 4 and 5. The length of the transition piece can be ignored. The
total number of bends used
in the chimney flue and air supply is 8. The bend in
the transition piece can be ignored. According to the table, 4.6 metres per bend
must be added. This brings the total pipe length to:
(4.6 x 8) +10 = 36.8 +10 = 46.8 m.
This is less than the maximum length of
55
metres stated in the table. The
installation therefore fulfils the requirements.
3.10 Electrical
connection
Warning
The installation should be carried out by a competent person, in compliance
with general and locally applicable regulations (1.3 "Regulations") .
3.10.1 Introduction
This section covers the following topics:
•
Preparation ;
• Connecting the mains power ;
Optionally, it is possible to connect an isolating transformer, a continuous pump,
a program-controlled pump, an extra ON mode switch and an extra alarm signal
to the water heater. For these options, see:
•
Isolating transformer ;
• Connecting a program-controlled pump ;
• Connecting an extra ON mode switch
Note
The optional components are not included in the electrical power
consumption rating stated in the table (3.4.2 "General and electrical
specifications") .
IMD-0792 R0