Winland Electronics HA-1 - Manual (Page 2)

G
ENERAL
I
NFORMATION
The Humid•Alert® humidity sensor provides reliable monitoring of an area where a single high or low humidity limit
is critical. The HA-1 monitors relative humidity from 20% to 80% R.H., activating an internal switch output when
the critical limit is exceeded. This output can be used to activate alarm systems, telephone dialers, or other warning
devices. This is a single set-point device; it can monitor for either a high or a low level, but not both. If additional
monitoring (high and low) is required, Winland’s EnviroAlert® line of products with humidity monitoring accessories
is recommended.
T
HEORY OF
O
PERATION
The HA-1 senses the ambient room humidity using a nylon-banded sensing element. The HA-1 requires no power
to operate and provides a SPDT contact output when the single set-point is met. Humidity should be expected to
vary from room to room and from one area of a room to another. Ventilation and airflow will greatly affect relative
humidity. The single set-point is established by using the adjustment knob on the face of the unit.
L
OCATION
Choose a location for the Humid•Alert about five feet above the floor on an inside wall with average room
temperature and relative humidity conditions.
NOTE: Temperatures above 90° F (32.2° C) will adversely affect the accuracy of the HA-1.
I
NSTALLATION
The HA-1 has three mounting options: horizontally positioned single-gang wall box, direct wall mount, and duct
mount.
NOTE: Only use the rubber mounting gasket when mounting the HA-1 to a duct; use in any other application will
limit natural airflow reducing the accuracy of the unit.
To install onto a single-gang wall box:
1) Run low voltage wiring from alarm panel, dialer, etc. to chosen location through the wall into the single-gang
wall box. Plug openings in the sides and back of the box to prevent drafts from affecting the HA-1’s operation.
2) Remove the HA-1 cover by prying with a screwdriver in the notch on the bottom of the case (Figure 1).
3) Mount the base of the unit onto the single gang wall box using the screws provided.
4) Make the wiring connections to the HA-1 assembly using
lead wires and wire nuts supplied (Figure 2). Tuck wires
into the bottom of the base, and then snap the cover
assembly onto base (Figure 2).
Figure 1
Figure 2
To insure proper operation, test weekly.
To install directly onto a wall:
NOTE: If installing on sheetrock, use sheetrock anchors
and screws.
1) Drill a small hole in the wall and run low voltage
wiring from alarm panel, dialer, etc. to the
location chosen. Pull about six inches of wire
through the hole. Plug the opening to prevent
drafts from affecting the HA-1’s operation.
2) Remove the HA-1 cover by prying with a
screwdriver in the notch on the bottom of the
case (Figure 1).
3) Mount the base of the unit onto the wall using
the hardware provided.
4) Make the wiring connections to the HA-1 assembly using lead wires and wire nuts supplied (Figure 2) Tuck
wires into the bottom of the base, and then snap the cover assembly onto base (Figure 2).
To install onto a duct: Follow instructions printed on the adhesive mounting template.
Setting the Humidity Limit
Select an acceptable high or low humidity limit by turning the adjustment knob on the face of the unit. For all
installation options it is recommended that once the unit is installed the current ambient R.H. level is determined
prior to setting the HA-1 high or low limit. To determine the current R.H. level, turn the adjustment knob on the
face of the unit until you hear a “click”. The point at which you hear the output contact change is the current relative
humidity level. Always allow enough time for the sensor to acclimate to current room conditions before considering
the reading to be accurate.
NOTE: The HA-1 has a built-in 2-3% hysteresis (delay). Therefore, the unit will not set and reset at exactly the same
point. This spread will amount to approximately 2-3% R.H. of the alarm set point.
If protecting against low humidity, assume continuity between C and N.C. under non-alarm conditions. When the
actual humidity drops below the set point, C to N.C. will then be open. To test this configuration with the limit set
below the current reading, rotate the knob clockwise until the output contact changes.
If protecting against high humidity, assume continuity between C and N.O. under non-alarm conditions. When the
actual humidity rises above the set point, C to N.O. will then be open. To test this configuration with the limit set
above the current reading, rotate the knob counterclockwise until the output contact changes.