7.3.9 Frost protection
The temperature of the unit is controlled using the burners. When the internal temperature measured is
lower than the value of the “Forced preheating threshold” parameter (default value = 10°C (50°F)), the
unit switches on the burners to keep the water and therefore the humidifier warm. If the temperature
inside the unit is lower than the temperature set for the “Pump drain threshold” parameter (default value
= 5°C (41°F)), the unit completely drains the water inside the boiler.
Index Parameter Description
Eb11 Frost protection
Set the frost protection function with burner management.
Sett the safety function to completely drain the water in the boiler.
In addition to these functions, on outdoor models there is also a normally-open valve connected to a
temperature probe (independent), which completely drains the boiler if it measures a temperature of
3°C (37.4°F) (default value, can be set manually). It is also possible to install heaters inside the unit, which
work independently (kit to be purchased separately, P/N: UGKHEAT115 for models powered at 115 Vac,
UGKHEAT230 for models powered at 230 Vac). The recommended calibration temperature for the
heaters is 8°C (46.4°F).
7.4
Menu E. Settings
- c. Configuration
7.4.1 Main probe (Installer menu)
The main probe can be configured on the screen with index Ec01.
Index Parameter Description
Ec01
Main
probe
Main probe configuration;
Default:
Enable: Enabled (depending on the type of control)
Type: 0-10V
Minimum: 0% rH
Maximum: 100% rH
Offset: 0
Enable Al (enable alarms): YES
Delay: 120 seconds
Possible settings:
Type: 0-10V/0-1V/NTC/4-20mA/0-20mA/2-10V
Minimum: 0-100% rH
Maximum: 0-100% rH
Offset: 0
Enable Al (enable alarms): YES
Delay: 0-999 seconds
For each probe, after having specified the type, the minimum and maximum values readable can be
defined, as well as an “offset” to compensate for any imprecisions in the value read (example: offset = 3 %
rH corresponds to 3 percent increase of the humidity value read by the probe). Parameter “En. Al.”
activates the alarms corresponding to any probe faults. If a malfunction is detected for a time greater than
the value of “Delay” (seconds), the “main probe broken or disconnected” alarm is activated.
7.4.2 Limit probe (or second probe - Installer menu)
The limit probe (if present) can be configured on the screen with index Ec02.
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