Frost Protection; Clearances For Balanced Flues - Grant Combi 70 V3 User's Installation Manual

Terminal position
A Below a gutter or sanitary pipework
B Horizontal from an opening, air brick or window
C Above ground or balcony level
D Below eaves or balcony
E From an internal or external corner
F From a terminal facing the terminal
G From a surface facing the terminal
H Vertical from terminals on the same wall
I Horizontal from terminals on the same wall
J Below an opening, air brick, window etc.
K From vertical sanitary pipework
L Vertical flue from a wall
M From an oil storage tank
Notes: * 75 mm with protection.
** 300 mm British Standards
5.9

Frost protection

For additional protection of either the entire heating
system, or the boiler and localised pipework, it is
recommended that a frost thermostat be installed.
Refer to Section 6.7 for connection details.
To protect the heating system the frost thermostat
should be sited within the house in such a place that it
can detect any rise and fall in the ambient air
temperature, i.e. in a room with a radiator.
5 - GENERAL BOILER INFORMATION
Fig. 15 - Clearances for Balanced flues
Min. distance (mm)
Combi V3, Combi Max and Vortex Combi models
Distances measured to rim of terminal.
* 600
600
Clearances recommended by Grant
**300
Engineering (UK) Limited in accordance with
*600
British Standards and Building Regulations.
**300
1200
600
Notes:1 An opening means an openable
1500
750
600
300
600
2 Notwithstanding the dimensions
1800
3 A way of providing protection of
Where the frost thermostat is installed outside the
house (to protect a boiler installed in an external boiler
room or garage) or in an attic, it is recommended that
it be used in conjunction with a pipe thermostat to
avoid unnecessary and wasteful overheating of the
property. The pipe thermostat should be located on the
boiler return pipe, and set to operate at 25°C. Refer to
Section 12 for connection details.
element, such as an openable
window, or a permanent opening
such as a permanently open air vent.
given, a terminal should be at least
300 mm from combustible material,
e.g. a window frame.
combustible material would be to fit
a heat shield at least 750 mm wide.
27