Johnson Controls 050, Установка, эксплуатация и обслуживание

Страница: 152 / 166

JOHNSON CONTROLS
152
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 8 – SERVICE
TABLE 37 - TEMPERATURE SENSOR
RESISTANCE
°F VOLTAGE RESISTANCE °C
-25 0.49 139,639 -30.6
-20 0.53 127,453 -28.9
-15 0.60 109,624 -26.1
-10 0.69 94,519 -23.34
-5 0.78 81,665 -20.55
0.0 0.88 70,750 -17.78
5 0.98 61,418 -15.00
10 1.10 53,426 -12.22
15 1.22 46,582 -9.44
20 1.35 40,703 -6.67
25 1.48 35,639 -3.89
30 1.62 31,269 -1.11
35 1.77 27,490 1.67
40 1.91 24,219 4.44
45 2.06 21,377 7.22
50 2.21 18,900 10.00
55 2.36 16,744 12.78
60 2.51 14,681 15.56
65 2.66 13,216 18.33
70 2.80 11,771 21.11
75 2.94 10,502 23.89
80 3.08 9,388 26.67
85 3.21 8,404 29.45
90 3.33 7,537 32.22
95 3.45 6,770 35.0
100 3.56 6,090 37.78
105 3.66 5,487 40.56
110 3.76 4,951 43.34
115 3.85 4,475 46.11
120 3.94 4,050 48.89
125 4.02 3,671 51.66
130 4.09 3,332 54.44
135 4.16 3,029 57.22
Building Pressure Transducer
The Building Pressure Transducer is located behind the
right hand damper door. The purpose of the transducer is
to sense and convert the static pressure in the building to
a 0 to 5VDC voltage. The DC voltage is then sent to the
Unit Controller and compared against the “BUILDING
PRESSURE ACTIVE SETPOINT”
. The transducer is fac-
tory wired, but pneumatic tubing must be field supplied
and installed (refer to SECTION 2 – INSTALLATION in
this manual). The Building Pressure Transducer measures
differential pressure in the building and atmospheric pres-
sure. When verifying transducer operation, the technician
can insert a tee into the pneumatic tubing and connect a
manometer to the tee to verify the pressure being applied
to the transducer. Once this pressure is known, a com-
parison can be made of the building pressure vs. output
VDC from the transducer. A practical and quick check of
this transducer can also be accomplished by removing the
pneumatic tubing lines from both the low and high side
connections on the transducer. Since both of the inputs
will now be exposed to the same pressure, the differential
pressure will be zero, and the output 2.5VDC according to
Table 39 on page 153 .
Return Fan Pressure Transducer
If the unit is order with the Return Fan Option the
unit will have a Return Fan Pressure Transducer. The
transducer is behind the right hand damper door and
compares the pressure in the return air compartment to
atmospheric pressure. The Unit Controller varies the
speed of the Return Fan in order to maintain the correct
differential pressure in the return compartment. When
verifying transducer operation, the technician can insert
a tee into the pneumatic tubing and connect a manom-
eter to the tee to verify the pressure being applied to the
transducer. Once this pressure is known, a comparison
can be made of the return compartment pressure vs.
output VDC from the transducer. A practical and quick
check of this transducer can also be accomplished by
removing the pneumatic tubing lines from both the low
and high side connections on the transducer. Since both
of the inputs will now be exposed to the same pressure,
the differential pressure will be zero, and the output 2.5
VDC according to
Table 40 on page 153
.