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Humidifiers | Accessories
AIR FLOW SWITCH PRESSURE DIFFERENTIAL TYPE
Model HXAAE
Air flow in the duct may be sensed by using this differen-
tial pressure switch. The differential in pressure between
the interior of the duct and ambient when air is moving in
the duct closes a micro switch allowing the humidifier to
operate. Air pressure differential as low as .07 w.g. and
as high as 12.0 w.g. may be sensed with one model. The
switch may be mounted with tubing connecting to the
duct. Switch is UL listed.
OUTDOOR AIR TEMPERATURE COMPENSATED DIGITAL HUMIDISTAT, ON-OFF CONTROL
Model HXHAT
The HXHAT humidistat can be either wall or duct mount-
ed and includes a remote outdoor temperature sensor for
exterior wall or intake duct mounting. The humidistat
can automatically change the set-point in response to
changes in outdoor temperature or be set to maintain a
set-point regardless of temperature changes. The LCD
display shows set-point RH%, actual RH% or outdoor
temperature (from -9 to 98°F). Relay contacts provide
an on/off signal to the humidifier. Set-point range is from
30-65% RH. Default set-point is 40% RH.
The HXHAT will automatically reduce the RH set-point
as the temperature drops below 35°F. The graph below
shows the RH setting of 35° RH and as the temperature
drops the RH set-point is adjusted by the computer as
shown. Below -10° there is no adjustment.
G-22
AIR FLOW SWITCH, VELOCITY TYPE
Model HXAAF
This air flow switch is installed in the duct to prevent
humidifier operation when air flow is not occurring.
This switch provides a positive and economical meth-
od to detect loss of air flow velocity. The switch may
be installed on the side, top, or bottom of a horizontal
duct. Installation can be made in a vertical duct if the air
flow is upward. A horizontal flow velocity of 480 fpm or
upward vertical flow of 910 fpm is required to operate
the switch. Switch is UL listed. Case dimensions are
4-3/8 high, 3-13/16" wide. The paddle extends 7-23/32"
into the duct.
7/8"
(22)
4-1/4"
(108)
3-1/4"
(83)
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