Unit installation

Installation - Electrical
SCXF-SVX01K-EN 39
Static Pressure Transducer
Installation (VAV units only)
Supply air static pressure controls inverter option. A static
pressure head assembly ships separate in the control
panel for field installation in the supply air duct work.The
installer is responsible for providing pneumatic tubing.
Transducer Location
Place head assembly in an area of the ductwork that will
provide an average and evenly distributed airflow pattern.
Use the following guidelines to determine an appropriate
installation location.
1. Locate the static head assembly about 2/3 to 3/4 of the
way down the longest duct run, in an area
approximately 10 duct diameters downstream and 2
duct diameters upstream of any major interferences,
turns, or changes in duct diameter.
2. When installing pneumatic tubing between the head
assembly and transducer in the control panel, do not
exceed 250 feet for 1/4” OD tubing or 500 feet for 3/8”
OD tubing.
Installing the Transducer
Complete the following procedure to properly install static
pressure transducer.
1. Mount the pressure sensing head assembly in the duct
so that the sensing tip is in the middle of the duct so
that it will provide a proper pressure measurement.
See Figure 26, p. 39.
2. Connect the pneumatic tubing from the sensing head
to
the push-on tubing connection in the control panel.
Use a plastic static pickup tubing. Do not exceed 250
feet for 1/4“OD tubing or 500 feet for 3/8” OD tubing.
The transducer inside the control panel picks up low side
or
reference pressure.
Note: If plastic tubing pulls away from a connection, trim
it back before replacing it on the fitting. Stretched
tubing may leak and cause faulty control
.
Table 29. VFD electrical data
VFD L.I.C.
Without Bypass With Bypass
HP 200V 460V 575V 200V 460V 575V
7.5 23.8 10.6 8.8 32.2 10.6 8.8
10 32.2 14 11.1 48.3 14 16.6
15 48.3 21 16.6 61.9 21 16.6
20 61.9 27.6 21.4 78.2 27.6 21.4
25 78.2 34 26.3 92 34 26.3
30 92 41 31.2 117 41 31.2
40 117 53 39.9 139.2 53 39.9
50 NA 64 50.6 n/a 64 50.6
60 NA 77 NA n/a 77 n/a
Note: Values are at the maximum VFD input rating and not the reduced
motor values. L.I.C. = Line Input Current.
Table 30. Single stage electric heat electrical data
SXWF Size SXRF Size Heat Kw 200V Amps 460V Amps
20 - 18 50 21.7
22 - 18 50 21.7
25 20 18 50 21.7
29 25 23 63.8 27.7
32 29 23 63.8 27.7
35 30 27 75 32.5
38 35 27 75 32.5
42 - 31.5 87.4 37.9
46 40 31.5 87.4 37.9
52 - 39 108.3 46.9
58 50 39 108.3 46.9
65 - 48 133.2 57.7
72 - 48 133.2 57.7
80 60 48 133.2 57.7
Note: Electric heat amperage should not be considered when determining
minimum circuit ampacity. The current of the unit in the heating mode
will not exceed the current of the unit in the cooling mode
Table 31. 2 stage electric heat electrical data
Unit Size
SCWF
Heat
kW
200V
Amps
460V
Amps
575V
Amps
90 76 N/A 95.39 N/A
100 76 N/A 95.39 N/A
110 76 N/A 95.39 N/A
Figure 26. Static pressure sensor installation
Duct
Pressure
Sensor
Static Pressure
Head Assembly
Connector
for 1/4”
Tubing
Sheet Metal Screws
(provided by installer)
NOTE:
Pleace sensor inlet
perpendicular to airflow.