5. Preparing for operation
5.1
Preliminary
checks
Before starting the humidifier, check that:
l the water and electrical connections have been completed and the steam distribution system
configured according to the instructions contained in this manual;
l the humidifier water shut-off valve is open;
l the power fuses are installed and intact;
l terminals 7U and 8U are jumpered or connected to the remote ON/OFF contact, and that the latter is
closed;
l the probes or the external control device are correctly connected (and that the earth of these devices
is electrically connected to the earth of the main control board);
l the steam hose is not choked;
l in the event of ducted humidification, operation of the humidifier is slaved to the operation of the air
fan (replacing or in series with the remote ON/OFF contact);
l the condensate return pipe from the blower has been installed and is not obstructed;
l the drain pipe is connected correctly and unobstructed.
Important: before starting, check that the humidifier is in perfect condition, that there are no water
leaks and that the electrical parts are dry. Do not connect power if the appliance is damaged or even
partially wet!
5.2
Different types of
gas supply
Important: the appliances are delivered calibrated and tested to operate on natural gas (methane).
The humidifier can be supplied by the following types of gas:
o
Natural gas (G20-G25 methane - factory setting);
o
Propane-Butane (LPG G30-G31);
A number of parameters on the electronic controller need to be set for correct operation, calibrating
combustion by checking the values of CO2 (% vol) and CO (ppm) in the flue gas:
NATURAL GAS/LPG CALIBRATION
no. turns
UG45 UG90 UG150 UG180 UG300 UG450
Gas min max min max min max min max min max min max
G20-G25 1450 4700 1700 5050 1900 6750 2000 5300 1900 6750 1900 6750
G30-G31 1650 4200 1850 4450 2000 5150 2000 5150 - - - -
Tab.5.a
5.2.1 Gas burner calibration
The burner is pre-calibrated in the testing phase by the manufacturer; nonetheless, combustion should
be checked and adjusted if necessary.
5.2.2 Preparing to analyse combustion
If the flue gas exhaust pipe is positioned horizontally or vertically:
1. remove the cap from the inspection section of the humidifier flue gas exhaust pipe;
2. insert the flue gas analyser probe;
3. perform the flue gas analysis.
Once analysis has been completed, reposition the cap on the inspection section.
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