Supplied By www.heating spares.co Tel. 0161 620 6677
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7
ASSEMBLY AND INSTALLATION GUIDELINES
7.1 General
The boiler is suitable for operating at a maximum wor-
king pressure of 6 bar. It can be installed in open vented
or sealed systems with a minimum pressure of 0.8 bar
sealed and 0.3 bar open vented.
7.2 Boiler assembly
The boiler is supplied with full assembly instructions. On
request special assembly tools can be hired from Broag
on a daily basis.
However, Broag (or a Broag approved boiler erection
engineer) can provide boiler assembly services and / or
building supervision.
7.3 Water connections
The boiler flow and return connections can be fitted
on either side of the boiler (left or right hand side)
dependant on design or site conditions.
The boiler comes with four flanges, 2 x blank and 2 x Ø
107 mm (int.) weld neck.
The end sections have a 3/4 “ BSP tapping to accept the
supplied drain cock.
Note:
The Gas 550 Duo has two sets.
7.4 Pocket for the thermostat capillaries
The multi pocket for the thermostat capillaries should be
fitted in the top front-end section of the boiler and on
the same side of the boiler as the instrument panel. The
water level control electrode should be fitted in the 1”
tapping of the other end section.
Note:
The Gas 550 Duo has two sets.
7.5 Water pressure
Each section is hydraulically tested at 10 bar. Maximum
test pressure for the assembled boiler block is 7.8 bar.
Minimum working pressure is 0.8 bar at a maximum
working temperature of 110°C or 0.3 bar at a maximum
working temperature of 95°C. Maximum working pres-
sure is 6 bar.
8
GAS SUPPLY
8.1 General
The instrument panel (mounted in the front casing) must
be mounted on the same side of the boiler as the flow
connection, either left or right (choice on assembly). As
standard the gas train must also be on the same side as
the flow connection. However an extension cable can be
supplied (option) to allow the gas train to be mounted on
the opposite side to the instrument panel.
The local Gas authority should be consulted to ensure
that an adequate pressure and supply is available at the
boilers maximum output. To minimise risk of sediment or
foreign particles entering the control valves, an approved
filter can be fitted into the pipe system downstream.
The gas supply should be conforming to the British Gas
safety regulations.
Note:
The Gas 550 Duo requires two gas supplies.
8.2 Gas pressure
Natural gas, cat. I
2H
(20mbar)
Maximum gas pressure at inlet 100 mbar.
Main burner pressure settings :
- full load
: 8.4 mbar
- part load
: 2.2 mbar
Pilot burner pressure settings : 13 mbar
Gas inlet pressure
: 17 - 25 mbar
8.3 Injectors
Injector size main burner
: 5.4 mm
Injector size ignition burner
: 1.0 mm
Note:
The Gas 550 Duo has two sets.
