5
Combi 90 Outdoor Module
Note: The burner is supplied factory set at the output given in Section 2.3.
When commissioning, the air damper must be adjusted to obtain the correct CO
2
.
Air damper settings
2.5
2 - BOILER TECHNICAL INFORMATION
Fig. 2
Water schematic of boiler
2.6
3 - GENERAL BOILER INFORMATION
Boiler description
3.1
The Grant Outdoor Combination boiler has been
designed for use with a sealed central heating system
and will provide domestic hot water at mains pressure.
The boiler is supplied with the burner fitted and is
suitable for use with kerosene only when used with the
factory fitted low level discharge flue system. The flue
can be adjusted on site for either rear, left hand or
right hand flue outlet position, as required.
A Conventional external stainless steel flue system is
available for use with kerosene or gas oil.
The temperature of the water leaving the boiler to heat
the radiators may be adjusted using the control
thermostat. It is recommended however, that the
thermostat is set to maximum to achieve optimum hot
water performance. The temperature of the domestic
hot water is controlled by a thermostatic mixing valve
located in the insulated rear compartment of the boiler
casing. Please also refer to Sections 3.5 and 3.6.
Notes:
1 The data given above is approximate only.
2 The above settings may have to be adjusted on site for the correct operation of the burner.
3 Gas Oil is not suitable for use with the low level discharge of the Outdoor modules.
4 Net flue gas temperatures given are ± 10%.
5 ** Net thermal efficiency (BSRIA).
To obtain the correct CO
2
level, the final flue gas reading must be taken with all casing and door panels fitted.
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