General Boiler Information - Grant Combi 90 V3 User, Installation & Servicing Instructions

5.1
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Boiler description
The Grant Outdoor Combination boilers are automatic pressure
jet oil appliances designed for use with a sealed central heating
system and to provide domestic hot water at mains pressure.
All boilers are supplied with the control panel and burner
factory fitted and set for use on Class C2 kerosene.
Note: As Class D gas oil should not be used unless the flue
terminal concerned is more than 2 metres above ground
level, only kerosene can be used with the low level discharge
flue system factory fitted to all Grant Outdoor Combi
boilers.
Where required, a twin-wall stainless steel high -level flue
system (Green system) is available from your local stockist.
Refer to Section 6.3 for details.
If a high-level flue system is used, the Outdoor Combi 90 V3
and Combi Max models can be adapted for use on Class D gas
oil. Refer to the technical information in Section 4.4 for gas oil
burner settings.
Condensing Combi boilers are only suitable for use with
Class C2 kerosene.
IMPORTANT: If the boiler is to be used on gas oil, it must
not be operated on that fuel until the burner nozzle and pump
pressure have been changed to suit.
To change the nozzle, remove the burner from the boiler and
then remove the nozzle as described in Section 10.4. The
installer/commissioning engineer must amend the information
on the boiler data label accordingly.
All burners are ready to be connected to a single pipe system
with a loose flexible fuel line (600 mm) and 3/8" to 1/4" BSP
male adaptor supplied with the boiler. If required, an additional
flexible fuel line (600 mm) and 3/8" to 1/4" BSP male adaptor
are available to purchase from your local stockist, for two-pipe
oil supply systems, Part No. RBS 104.
The boiler control panel is fitted with an ON/OFF switch, boiler
thermostat control knob and the manual reset button for the
overheat thermostat.
The temperature of the primary water leaving the boiler to heat
the radiators may be adjusted using the boiler thermostat.
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5 - GENERAL BOILER INFORMATION

Outdoor Combi 90 V3, Combi Max and Condensing Combi
The temperature of the domestic hot water leaving the boiler is
controlled by a thermostatic mixing valve, located in the rear
compartment of the boiler on the Outdoor Combi 90 V3 and
Combi Max, and in the front burner compartment on the
Outdoor Condensing Combi 26 and 36 boilers. Refer to Section
5.13 for boiler operating details.
To achieve the optimum hot water performance from the
Outdoor Combi 90 V3 and Combi Max, the boiler thermostat
should be set to maximum.
The setting of the boiler thermostat on the Outdoor Condensing
Combi boilers has no effect on the domestic hot water
temperature.
A remotely located timer and room thermostat, or alternatively
a programmable room thermostat, can be connected to the
boiler to allow the User to set the central heating operating
times and temperature.
Alternatively a remote programmer, located in a convenient
position for the User, can be connected to the boiler to control
the operating times of both the central heating and domestic hot
water.
5.2
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Delivery
The Grant Outdoor Combi boilers are supplied in one pack with
the burner and control panel factory fitted.
The low level discharge flue terminal and terminal guard are
supplied loose inside the boiler enclosure, as is the wall flashing
strip, for fitting on site.