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2
Installation
Ceiling Hung Evaporators: When mounting Manning
TM
AirScan
iR 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 AirScan
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
B
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 electrical 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.
TM
If the AirScan
iR is to be used with the AirAlert
call Honeywell Analytics for specific wiring instructions.
Figure 2. Wiring Diagram
White connects to signal input of
monitoring equipment
Red connects to 24 VDC power supply
positive side
Black connects to 24 VDC ground side
Bare wire wrap connects to case ground
at monitoring equipment (earth ground)
Manning AirScan-iR Refrigerant Sensor
continued
TM
iR
TM
96d, please
Output (white)
+24 VDC (red)
DC ground (black)
Shield (bare)
19100 AirScan-iR-ind 05/2006 REVA Copyright © 2006 Manning Systems, Inc. All Rights Reserved.
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 AirScan
TM
AirAlert
96d 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 AirScan
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.
SIG
+24
GND
SHLD
JP1
TEST +
TEST -
TM
iR sensors with an
TM
iR Refrigerant Sensor may
6
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