Wiring - Honeywell Manning AirScan iR Instruction And Installation Manual

AirScan iR - Industrial
Ceiling Hung Evaporators: When mounting Manning
AirScanTMiR sensors near evaporators, mount the
sensor no higher than two feet below the top of the
evaporator coil. Do not mount in high air flow (1,200
feet/minute maximum). Never mount the sensor on
evaporators as vibration can damage the sensor.
Other Locations: When mounting AirScanTMiR
sensors in locations such as roof top air units,
ductwork, attic spaces, makeup air intakes, etc.,
contact Honeywell Analytics for application assistance
and recommendations.

Wiring

Electrical wiring must comply with all applicable
codes. Plant equipment that may be involved and
operating conditions should be discussed with local
operating personnel to determine if any special needs
should be considered.
Nearly all start-up problems are due to improper
wiring or monitor configuration. Please follow these
guidelines carefully.
Always use three conductor, insulated, stranded,
shielded copper cable. Use only three conductor
cable, not two cables of two conductor wire (see
Figure 2).
Do not pull sensor wiring with AC power cables. This
will cause electrcal interference. Be sure there are no
breaks or splices in sensor wiring runs. If cable runs
cannot be made without a splice, all connections
must be soldered. Soldering should be done using a
rosin flux to tie the connecting ends of sensor wires to
ensure a positive and long-lasting contact..
Figure 2. Wiring diagram
6
If the AirScan iR is to be used with the
TM
AirAlertTM96d, please call Honeywell Analytics for
specific wiring instructions
Ground the shield at the main control panel. Connect
the shield wire in the sensor terminal block labeled
shield. Tape all exposed shield wire at the sensor to
insulate it from the enclosure.
All penetrations into a refrigerated room should be
sealed to prevent condensate from forming in the
conduit and dripping into the sensor enclosure.
Make drip loops for cables going into sensor
housings (see Figure 1). Follow the special mounting
instructions on the enclosure (...This End Up).
Electrical Power: 24 VDC regulated, 1.0 amp.
Output: Circuit board mounted sensor provides a
linear 4/20 mA output. Monitoring equipment may
have a maximum input impedance of 500 ohms.
Contact Honeywell Analytics for specific wiring
instructions when using AirScanTM iR sensors with an
AirAlertTM96d readout unit.
Cable Recommendation: Use #18/3 (Belden #8770)
for cable runs up to 200 feet. Use #16/3 (Belden
#8618) for cable runs up to 1,000 feet. Use only the
existing punched holes for connections to the sensor.
If sensor is SUPER HEAT equipped, contact Manning
Systems for cable recommendations. Use only the
existing punched holes for connections to the sensor.
Monitoring: The AirScanTMiR Refrigerant Sensor may
be monitored by any Manning Readout/Alarm unit or
other appropriately configured system. Monitoring
equipment must be configured to indicate a fault if
the signal is below 1.5 mA. All signals above 20 mA
must be considered a high gas concentration. A failed
sensor will output a 0.5 mA signal.