ALERTON MICROSET 4 - Troubleshooting

© Honeywell LT-MS4IOG Rev. 04 | Revised October 2015
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INSTALLATION & OPERATIONS GUIDE | MICROSET 4
Troubleshooting
Table 11 Troubleshooting
ISSUE CAUSE RESOLUTION
Solar exposure heats the sensor. Microset 4 is mounted near a window
or glass door where it sits in direct
sunlight for at least part of the day.
• Physically move the Microset 4 so it is
not installed in direct sunlight.
• Engineering should closely review
mechanical design drawings for sensor
locations and diffuser locations.
• Do not install on external walls.
Air infiltration Air flowing into or
out from the wall cavity
penetrates through the Microset 4
backplate.
Pressure differences in controlled
spaces (the stack effect). Especially in
high-rise buildings, the stack effect is
induced by warm air rising resulting in
varying pressure levels. Lower floors
experience negative pressures while
upper floors experience positive
pressurization.
• Affix a closed-cell foam barrier between
the Microset 4 backplate and the wall,
sealant, and/or putty. See “Installation
best practices” on page 9 and “Optional
foam accessory” on page 52.
Completely cover the wiring opening and
all backplate screw holes.
• Add insulation into the wall cavity when
mounting the Microset 4.
Temperature difference between
wall cavity temperature and
space temperature can contribute
to air infiltration and impact the
wall’s surface temperature.
Temperature differences can impact
air flow.
• Affix a closed-cell foam barrier between
the Microset 4 backplate and the wall,
sealant, and/or putty. See “Installation
best practices” on page 9 and “Optional
foam accessory” on page 52.
Completely cover all backplate screw
holes.
• Add insulation into the wall cavity when
mounting the Microset 4.
• Do not install on external walls.
Air flow across wall surface is too
high
Improperly designed or aimed
diffusers can cause down drafts along
walls which can impact sensor
readings.
• Engineering should closely review
mechanical design drawings for sensor
locations and diffuser locations.
• Adjust diffusers so that air is not directed
toward the Microset 4.
No air flow at the sensor Blockages on the wall around the
sensor.
• Remove blockages or move the
Microset 4 to a new, clear location.
• Engineering should closely review
mechanical design drawings for sensor
locations and diffuser locations.