6
7
3.3
Installing oil supply lines
Oil connections should be fitted only by an approved installer. Please consult your burner manual in order to find the
instructions on how to connect the oil lines. We strongly suggest placing an oil filter in the oil supply lines.
3.4
Installing the ducting system
3.4.1 Installing supply ducts
For the O units a complete range of acoustically insulated supply air plenums is available, manufactured in white painted steel.
These are installed of top of the unit (Downflow versions: under the unit) and facilitate connection of the ductwork.
3.4.2 Installing return ducts
For the O units a complete range of acoustically insulated return air plenums is available, manufactured in white painted steel.
These are installed under the unit (Downflow versions: on top of the unit) and facilitate connection of the ductwork. It is also
possible to connect the return air ductwork to the side of the units. For this purpose matching white return air filter frames
are available. Multicalor does not recommend to connect the ductwork directly to the sides of the unit, as this means that a
large portion of the acoustic insulation is lost. If you wish to use an open return, you can order a perforated return air plenum.
ATTENTION: open return systems are only allowed if the unit is located in the room to be heated (“industrial style” space
heating). Open return systems are not allowed if the air is supplied outside of the room where the unit is installed.
•
Never remove the air filter. The unit must always be fitted with an air filter class EU3/G3 or better. Using the unit
without a filter can damage the unit.
•
Change filters regularly.
•
If you connect an outside air duct, always install a butterfly register as to regulate the amount of outside air.
3.5
Installing the flue gas exhaust
The flue pipe connections should be made according to the local codes. If the flue pipe traverses the roof, the flue pipe and
roof passage should be twin wall as to prevent any condensation occurring because of the sudden cooling of exhaust products.
Because of the very high efficiency of the unit, we strongly suggest using twin wall stainless steel flue pipe for the complete
flue exhaust system:
•
respect the advised clearances around the exhaust pipes. (Risk of fire).
•
try not to use a multitude of 90° turns.
•
when using a horizontal exhaust (not recommended) use a minimum slope of 50 mm/m!
4
Commissioning
4.1
Switching the apparatus on and off
Normally the machine should permanently be supplied with mains power. At the installation or maintenance stage you may
proceed as follows to switch on or off the device.
4.1.1 Switching ON
Proceed as follows to switch the machine ON:
•
Connect the mains power.
•
Set the room thermostat at the desired setting.
4.1.2 Switching OFF
Proceed as follows to switch the machine OFF:
•
Set the room thermostat 5°C lower than the actual temperature.
•
Wait for the unit to cool down. This may take a couple of minutes.
•
Disconnect mains power.
4.2
Setting the air temperature
4.2.1 Fan and limit controller(s)
Fan and limit controller(s) are set in factory and should not need adjusting under normal circumstances.
4.3
Setting the air quantity
Air volume should be adjusted according to the calculations made by the installer. Please check that the air temperature does
not exceed 65°C after the unit has been turned on for at least 15 minutes.
The fan speed can be selected by switching the connection wires on the PCB, located in the fan compartment. When selecting
the low speed setting, you will usually need to install a smaller nozzle to prevent tripping the overheat thermostat.
•
Low speed:
red wire
•
Medium speed:
blue wire
•
High speed:
black wire
