maintenance operation. The “maintenance alarm” time is the number of boiler operating hours before it
needs to be cleaned. During the start- up wizard, the feedwater hardness is entered, and the
”maintenance alarm” depends on this value, as shown in the table below:
Water hardness Maintenance alarm
Demineralised Cleaning/maintenance 3000 hours (NO STOP)
0-10°f STOP for cleaning/maintenance 3000 hours
10-20°f STOP for cleaning/maintenance 1500 hours
20-30°f STOP for cleaning/maintenance 1000 hours
30-40°f STOP for cleaning/maintenance 800 hours
If during the wizard the value is set to “automatic”, rather than entering the hardness value, the
maintenance alarm is automatically associated to the feedwater conductivity read by the conductivity
meter. The following table shows the dependency of the maintenance alarm on water conductivity.
Water conductivity Maintenance alarm
1-50 µS/cm
Warning at 3000 hours without STOP for cleaning-maintenance (it is
assumed that the water comes from a reverse osmosis system).
50-100 µS/cm STOP for cleaning/maintenance 3000 hours
> 100 µS STOP for cleaning/maintenance 1500 hours
The conductivity is read periodically, and the maintenance alarm times is thus updated as a consequence.
Thus, for example, if a water hardness of 15°f is set, the “maintenance warning” time will correspond to
1500 actual boiler operating hours; if the “maintenance pre-alert” time is set to 240 hours (default value),
the maintenance pre-alert will be activated after 1260 hours.
The humidifier will signal an alarm (and STOP the unit) for maintenance once the pre-set hours have been
reached, plus an additional 120 hours (in the above example, 1500 + 120 = 1620 hours).
It must be stressed that if demineralised water (manual mode) or 1- 50μS/cm (automatic mode) are
selected, the unit will signal maintenance and cleaning via the warning only, without ever shutting down
the humidifier.
7.2.9 Burner rotation/activation
Burner rotation and activation can be configured.
gaSteam 180/300/450 manages burner operation according to the setting of the “Burners Sequence”
parameter.
In normal operation, depending on the humidity request and the selected control mode (series or
parallel), the control logic automatically calculates the production for each unit. Rotation of the request
involves periodically changing these production references. In the long term, operating hours of the
burners are balanced, with consequently more uniform wear of the components and scale build-up in the
heat exchangers.
There are two types of rotation:
l IN PRODUCTION: timed rotation, i.e. whenever the gap between the operating hours of the two
burners reaches 10 hours, the production references are reversed.
l ON IGNITION: the burner with the lowest number of operating hours is ignited first, as long as the
difference between the operating hours is greater than 10.
There are also two types of activation:
l “PARALLEL”: the steam request is divided equally between the burners so that steam production is the
same.
l “SERIES” (also called “sequential”): if the steam request is less than 50% of the rated production, only
one burner is operated. Only if the request exceeds 50% does the other burner start.
Index Parameter Description
Ea10 Burners rotation
Set the burner sequence (series or parallel).
Burner rotation (in production, on ignition, no rotation)
Operating hours before rotation.
7.3
Menu E. Settings
- b. Functions
7.3.1 Preheat boiler water (Installer menu)
To ensure production starts quickly, the preheat function can be enabled. In this way, even when there is
no steam request, the water temperature in the boiler is kept at a value specified by the user. When
66|7. User menu and unit configuration
gaSteam - UG +0300090EN rel. 1.2– 09.10.2018
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