10
Multi Pass Oil Boilers
The Multi Pass range of automatic pressure jet oil boilers have
been designed for use with a central heating system with indirect
domestic hot water cylinder. They are not suitable for use with
either a direct cylinder or a 'primatic' cylinder.
The boilers are suitable for use on sealed central
heating systems.
Five Kitchen models are available and are listed below
together with their maximum outputs.
50/70
20.5 kW (70 000 Btu/h)
70/90
26.4 kW (90 000 Btu/h)
90/140
41.0 kW (140 000 Btu/h)
140/160
46.6 kW (160 000 Btu/h)
160/200
59.0 kW (200 000 Btu/h)
Four blue cased Boiler House models are available and
are listed below together with their maximum outputs.
70/90
26.4 kW (90 000 Btu/h)
90/140
41.0 kW (140 000 Btu/h)
140/160
46.6 kW (160 000 Btu/h)
160/200
59.0 kW (200 000 Btu/h)
All models (except the 70/90 and 90/140) are despatched
pre-set at their maximum output and for use with kerosene.
The 70/90 and 90/140 are pre-set to mid range output.
The boilers are supplied as Conventional flue models, if a
Balanced flue version is ordered, a Balanced Flue Kit is
required. The following flue kits are available from Grant
UK. Refer to Sections 4.8 and 4.9 for further details.
Yellow system - Standard low level concentric balanced flue
Short low level concentric balanced flue
225 mm, 450 mm and 675 mm extensions
90° extension elbow
45° extension elbow
45° elbow
Green system - Standard external high level/vertical flue
starter kit (room sealed)
Short external high level/vertical flue starter
kit (room sealed)
150 mm, 250 mm 450 mm and 950 mm extensions
195 - 270 mm adjustable extension
45° elbow
High level terminal
Vertical terminal
White system - High level concentric balanced flue kit
225 mm, 450 mm and 950 mm extensions
275 - 450 mm adjustable extension
45° elbow
Vertical concentric balanced flue kit
225 mm, 450 mm and 950 mm extensions
275 - 450 mm adjustable extension
45° elbow
3 - GENERAL BOILER INFORMATION
Boiler description
3.1
Kitchen boilers are supplied with the control panel and
burner factory fitted. The burners for Boiler House
models are supplied in a separate carton. A burner
supply cable is supplied pre-wired to all burners.
All burners are pre-set for use with kerosene and are
supplied ready to connect to a single pipe fuel supply
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 from Grant
Engineering (UK) Limited, for two-pipe oil supply
systems.
All models are suitable for use with Class C2 kerosene
to BS 2869:1998.
All models, except the 50/70, are also suitable for use
with Class D gas oil to BS 2869:1998.
Note: Only Kerosene may be used with low level
balanced flues, unless the flue terminal is higher
than 2.0 m above outside ground level.
If the fuel to be used is Gas Oil or the boiler output is
to be changed, it may be necessary to change the
burner nozzle, head and baffle settings. Refer to the
Technical Information in Sections 2.2 and 2.3. To
change the nozzle on Kitchen models, remove the
burner from the boiler then remove the nozzle as
described in Section 7.4. For Boiler House models,
unpack the burner and remove the nozzle as described
in Section 7.4. To remove the baffles refer to Sections
7.2 and 7.3, then refer to Figs. 30 to 34 for baffle
settings. The installer must amend the boiler data label
accordingly.
The temperature of the water leaving the boiler to heat
the radiators and hot water cylinder is User adjustable
from 65 to 85°C.
The boiler is fitted with an overheat thermostat (which
allows it to be used on a sealed central heating system)
which will automatically switch off the boiler if the heat
exchanger exceeds a pre-set temperature of 111°C ± 3°C.
For Kitchen models the control panel is fitted with an
ON/OFF switch, boiler thermostat control knob and
the manual reset button for the overheat thermostat. An
optional plug-in programmer is available which allows
the User to set the operating times for central heating
and hot water, (plug-in programmer not available for
140/160 and 160/200 models).
For Boiler House models a combined boiler and
overheat thermostat is fitted with a boiler thermostat
control knob and the manual reset button for the
overheat thermostat.
