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Operation

3.3.3 Humidification

Infrared Humidifier (Standard)

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.

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%.

Immersed Electrode Humidifier (Optional)

Direct acting electrodes immersed in water pass current between one another to boil the water in the

bottle and introduce steam to the bypass air via distribution pipes.

Immersed electrode humidifiers are started at 100% humidification request, and stopped at 0%.

Immersed electrode humidifiers cannot be driven in proportional mode.

Table 5 Parameters for immersed electrode humidifier control

1. Factory set according to model - refer technical data manual and user manual

Water level is automatically controlled by a sensor located in the overflow pipe. During a call for

humidification, the humidifier make-up valve energises whenever the level sensor breaks contact

with the water for more than 5 seconds and de-energises after 1 second of making contact. If water is

not detected within 1 minute after energising the make-up valve, both humidifier and make-up valve

outputs are de-energised for 4 minutes. This cycle repeats until the level sensor is satisfied. A ‘low

hum water’ alarm is generated after 5 continuous cycles and the humidifier and make-up valve out-

puts are ‘locked out’.

Table 4 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%

Parameter Setting

Humidifier Model

PEX@6 Amp, PEX@9 Amp, PEX@12 Amp

Humidifier bottle flush time 30 seconds