3
x
Set-up and Installation
23
FA ROTEX A1 BO - 10/2007
3.10.2 Connecting the temperature sensor
External temperature sensor
• Choose a location at about one third of the building height (minimum distance from floor: 2 m) on the coldest side (north or
north-east) of the building (not near other heat sources (chimneys, air shafts) and not subjected to direct sunlight).
• Place external temperature sensors in such a way that the cable exit points face downwards (prevents humidity ingress).
• Lay the sensor line and connect it to the control unit of the oil condensing boiler.
• Connect the external temperature sensors with a dual core cable (minimum cross section
1 mm
2
).
Mixer circuit flow sensor
• Connect the sensor line to the sensor plug
J8
(see fig 3-10).
Storage tank temperature sensor
• Disconnect the storage tank temperature sensor for operation
without
a hot water storage tank.
3.11 Connecting and filling up the oil line
The oil connection must be implemented according to the local regulations in the single strand system with an outlet-side built-
in ventilation oil filter.
• Lay oil hoses. Whilst doing so, ensure the following:
– that the combustion chamber can be opened without removing the oil hoses,
– that oil hoses do not buckle.
• Place the ventilation oil filter such that the oil hoses are connected without tension and the top half of the boiler can be
opened without hindrance.
• Insert the supplied spare Universal Micro-filter insert MC-7 in the venting oil filter (generally use only filters with maximum
25
μ
m).
• Connect oil line Whilst doing so, ensure the following:
– The inner diameter of the oil line must not be greater than 8 mm. Use the ROTEX VA-Oil oil feeding line or copper pipes
with diameter between 6 and 8 mm as the oil line.
– The total resistance of the suction line (total of height difference, line resistance and individual resistances) must not
exceed 4 m water column (0.4 bar).
• Fill up oil line. Suction the oil by using a hand pump.
• Check oil line for leaks according to the local regulations .
CAUTION!
Using an unapproved temperature sensor or one which is not calibrated to the unit can cause serious
malfunctions in controlled operation of the oil condensing boiler, damaging the unit control.
• Only use external temperature sensors and storage tank temperature sensors supplied within the scope
of delivery.
CAUTION!
Parallel routing of sensor and mains lines within an installation pipe can cause serious malfunction in
controlled operation of oil condensing boiler.
• Always lay the sensor line separately.
ROTEX recommends using EL low sulphur heating oil in order to achieve the highest efficiency and to keep the
maintenance expenditure low.
Admixing bio heating oils is possible (see chapter 2.2).
