Pace PAI - Air Measuring Device Connections; Air Measuring at the Fan Inlets

SECTION 3 - HANDLING, STORAGE, AND INSTALLATIONPACE │ Installation & Assembly Manual
Issue Date: 07/03/2018
70
Form PA102.20-N1
AIR MEASURING DEVICE
CONNECTIONS
Air Measuring at the Fan Inlets
• COMETER is a probe attached to the fan bearing
support on Comefri Forward Curve fans from size
7 x 7 up to 18 x 18. The probe is located on the
outboard side of the housed fan assembly. The
probe is piped to the negative (-) port of a factory
mounted transducer on the fan wall. The posi-
tive (+) port is left open to the fan section. Wiring
is not provided to the transducer unless factory
packaged controls were selected.
• PIEZORING (PIEZOMETER) is a tting or series
of ttings in the inlet cone(s) of housed fans larger
than 18 x 18 and all sizes of Plenum fans that are
combined into a single connection piped to the
negative (-) port of a factory mounted transducer
on the fan wall. The positive (+) port is left open
to the fan section. Wiring is not provided to the
transducer unless factory packaged controls were
selected.
The fan manufacturer does not recom-
mend placement of the ow measuring
probes inside the fan inlet cone in the
path of airow. These devices create
disturbances and unpredictable perfor-
mance losses.
Figure 110 - High and Low Connections for an in Fan
Air Monitoring System
LD17231
Figure 111 - High and Low Connections and
Associated Tubing for Fan Mounted Air Monitoring
System
LD17232
Figure 112 - Port Locations for Fan Mounted Air
Monitoring System
LD17233
High Port
Low Port
Air Measuring at Unit Outside Air Inlets
• AMS-60 used on Indoor air handlers usually mea-
sure outside air. This can be provided with one
or two pairs of positive (+ or High) and negative
(- or Low) pressure tube connections. Connect
(+) & (-) respectively to the (+) & (-) ports of the
transducer(s). Wiring & transducer are not pro-
vided unless factory packaged controls were se-
lected.