Emerson iCOM Humidification Infrared Humidifier, Parameters for infrared humidifier control

Operation

3.6.1Humidification Infrared Humidifier

There are two types of infrared humidifiers: small pan (IFS) and large pan (IFL). The operating mode of each is similar, however, some of the variables or timings differ.

Infrared humidifiers are started at 100% humidification request, and stopped at 0%. Infrared humid- ifiers cannot be driven in proportional mode.

Table 5 Parameters for infrared humidifier control

Parameter	IFS Default	IFL Default
Humidity in Last xx Hours	15 hours	15 hours
Prefill Time	30 seconds	60 seconds
Fill Time	4 minutes	7 minutes
Humidifier On Time	8 or 10 minutes	10 minutes
Flush Rate	150%	150%

An autoflush system automatically controls a water makeup valve to maintain proper levels in the infrared humidifier water pan during humidifier operation. If humidification is needed and 15 hours have elapsed since the last time the humidifier was on, then the humidifier is not turned on until the valve completes an initial fill of the humidifier pan. This pre-fill is about 30 seconds for a small pan and 60 seconds for a large pan. The valve continues to fill and flush the pan for about 4-1/2 minutes for a small pan or 7-1/2 minutes for a large pan. Pan size is selected based on unit specifications and is preset at the factory.

During humidifier operation, with the flush rate set at the default of 150%, the valve is opened peri- odically to add water to the pan (about 45 seconds every 7 minutes of humidifier operation for a small pan, or 80 seconds every 10 minutes of operation for a large pan). This adds enough water to the pan to cause about a third of the total water used to be flushed out of the overflow standpipe located in the humidifier pan. This action helps to remove solids from the pan. The flush rate is adjustable from 110% to 500% in 10% intervals. Default is 150%. If the water quality is poor, it may be desirable to increase the water flushing action above the normal 150% rate. Also, if the supply water pressure is low, the flush rate adjustment can be increased so that sufficient water level is maintained during humidification. The flush rate parameter, Infrared Flush Rate (Service Menu, Options Setup), is adjustable from 110%-500%.

External Humidifier Control—Optional

A factory-supplied option may be provided to allow a start-stop command to be sent to the control of a remote-mounted humidifier.

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