Rational LM1 Series, Original Installation Manual, Page: 77 / 92

11 | Exhaust gas connection on gas units
80.06.070_iCombi Pro-iCombi Classic_IM_V01_en-GB 77 / 92
Constant ventilation
Combustion air supply is assured via two ventilation openings to the outside,
each with 150 cm
3
[9153561.62 in³] free cross section (one near the ceiling, the
other near the floor).
Technical room ventilation systems
Kitchens in which gas units with a total nominal heat load of more than 50 kW
are installed must be ventilated and ventilated with HVAC systems. These air
HVAC systems also assure the combustion air supply for gas units if designed in
accordance with VDI 2052.
11.2 Exhaust gas connection Type A3 and B23
Requirements for unit size 6-1/1 GN
n
Type A3 exhaust air connection for this unit size corresponds to a room air-
dependent gas furnace with fans in front of burners without flow guards
and total rated load in installation space less than or equal to 14 kW.
n
A clearance of 400 mm [15.75 inches] must be kept between the flue pipes
of the unit and the grease filters of the exhaust hood/ventilation ceiling in
order to prevent a risk of fire in the fat filter.
n
It is not mandatory that gas only be supplied to the burners when the ex-
haust system is in operation.
n
An ascending flow socket is not necessary.
n
To install Type A gas units with total rated loads less than or equal to 14
kW, it is sufficient if the installation site meets one of the following criteria:
– The installation site has a capacity of more than 2m
3
/kW [70.63 ft³/
kW].
– The installation site has a door or window to the outside that can be
opened.
– The kitchen ventilation system in use has a minimum extraction volume
of 15m
3
/h [529.72 ft³/h] per kW total rated load and corresponding
ventilation openings.