Installation - Zone Sensors
UNT-SVX07E-EN
63
When selecting a sensor location, avoid the following:
•
Areas of direct sunlight
•
Areas in the direct airstream of air diffusers
•
Unheated or uncooled spaces behind the controller,
such as exterior walls or unoccupied spaces have a
temperature differential between the two sides.
•
Areas that are close to heat sources such as sunlight,
appliances, concealed pipes, fireplaces, chimneys, or
other heat-generating equipment
•
Drafty areas, such as near stairwells, outside doors, or
unsectioned hollow walls.
•
Dead spots behind doors, projection screens, or
corners that do not allow free air circulation.
•
Walls that are subject to high vibration
•
Areas with high humidity
•
High traffic areas (to reduce accidental damage or
tampering)
•
Metal barriers between the receiver and the sensor,
such as plastered walls with metal lathe or metal roof
decks, walls with concealed pipes
•
Thick, solid concrete walls between the receiver and
the sensor
•
Placing the sensor inside metal enclosures
Placement
Placement of the sensor is critical to proper operation (the
receiver is factory-mounted on fan coil units). For most
installations, barriers limit proper radio signal strength
more than distance. For best radio transmission range and
reliability, mount the receiver and sensor in line of sight.
Where this is not possible, try to minimize the number of
barriers between the pair of devices. In general, sheetrock
walls and ceiling tiles offer little restriction to the
transmission range for the sensor is as follows:
•
Open range: 2,500 ft (packet error rate = 2 percent)
•
Usable range: 200 ft
•
Typical range: 75 ft
Height Requirements
It is recommended that you mount the back plate a
maximum distance of 54 inches above the floor. If a
parallel approach by a person in a wheelchair is required,
reduce the maximum height to 48 inches.
Note:
Consult section 4.27.3 of the 2002 ADA (Americans
with Disability Act) guideline, and local building
codes, for further details regarding wheelchair
requirements.
Mounting Surfaces
Using the hardware provided, mount the back plate of the
sensor to a flat surface such as sheetrock or plaster, or an
electrical junction box. The sensor must be mounted
plumb for accurate temperature control and to ensure
proper air movement through the sensor.
•
If mounting onto sheetrock or plaster, use the plastic
threaded anchors (pre-drilling holes is not usually
necessary) and the two M3.5 x 20 mm mounting
screws.
•
For mounting onto an electrical junction box, use the
two 6-32 x 3/4 in. screws.
Installation
Fan Mode Switch
The fan mode switch can be unit mounted or wall
mounted. It includes a knob to indicate OFF/HI/MED/Low.
A wall-mounted fan mode switch ships loose inside the
unit accessory bag. Follow the steps below to install the
fan mode switch.
Items needed:
•
2 x 4 electrical junction box
1.
Remove the brown wire if not using a field-supplied
damper.
2. Remove the terminals, cut and strip wires as required
for installation.
3. Level and position a 2 x 4 electrical junction box.
Figure 48.
Wall-mounted wired and wireless zone
sensor dimensions
0.31 in.
Typ R.07 in.
(R1.9)
Typ 0.24 in.
2.9 in.
1.08 in.
0.12 in.
3.39 in.
4.68 in.
2.48 in.
0.63 in.
1.45 in.
2.62 in
