Carel SD Specifications download pdf (Page 26)

Installation & Maintenance Manual__________

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

)

MAX

(%CO

)

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

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 59 60

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Carel SD Specifications Page 26