Specifications

Installation & Maintenance Manual__________
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8.4 Adapting the Humidifier to Different Types of Supplied Gas
For proper functioning, the humidifier controller has parameters that must be set to the appropriate values
depending on the type of fuel gas supplied. See "Controlling the Humidifier" for information on changing
parameter values:
PARAMETER SETTINGS STANDARD CALIBRATION VALUES
GaSteam
Model bA bb bC bD b0
MIN
(%CO
2
)
MAX
(%CO
2
)
Temperature
Limit (ºF)
UG45
100 127 50 25 123 8.2 - 8.5 9.0 - 9.4 230
Natural
Gas
UG90
100 127 46 25 123 8.2 - 8.5 9.0 - 9.4 311
UG45
100 127 50 25 123 10.3 - 10.7 11.6 - 12.0 230
Propane
UG90
100 127 46 25 123 10.3 - 10.7 11.6 - 12.0 311
Note: The humidifier is set by default for maximum production equal to 70% of the rated output. To change the
maximum production, refer to the section “Reading and Programming the Parameters”.
Actual fan speed is dictated for all units based on the BTU heat content of the gas supplied.
The following graph shows the fan RPM value at various heat contents.
In the UG045 & UG090 models using the HumiControl, parameter “bb” is calculated with the following formula:
“bb” = RPM
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