Carrier VECTOR 1800 MT - Figure 8-32. Typical Setup for Testing High Pressure Switch; Figure 8-33. Pressure Transducer Values; Table 8-4 Suction and Discharge Pressure Transducer Voltages

8-3062-11039
8.19.2 Checking High Pressure Switch
WARNING
Do not use a nitrogen cylinder without a
pressure regulator. Cylinder pressure is
approximately 2350 PSIG (159.9 Bar). Do
not use oxygen in or near a refrigerant sys-
tem as an explosion may occur. (See
Figure 8 --32)
1
2
3
4
5
6
1. Cylinder Valve
and Gauge
2. Pressure Regulator
3. Nitrogen Cylinder
4. Pressure Gauge
[0 to 400 PSIG (0 to
27.2 Bar)]
5. Bleed-Off Valve
6. 1/4 inch Connection
Figure 8 --32. Typical Setup for Testing High
Pressure Switch
a. Remove switch as outlined in Section 8.19.1
b. Connect ohmmeter or continuity light across switch
terminals. Ohmmeter will indicate resistance and
continuity light will be lighted if switch closed after re-
lieving pressure.
c. Connect switch to a cylinder of dry nitrogen. (See
Figure 8--32)
d. Set nitrogen pressure regulator higher than cutout
point on switch being tested. Pressure switch cutout
and cut-in points are shown in Section 2.12.
e. Close valve on cylinder and open bleed-off valve.
f. Open cylinder valve. Slowly close bleed-off valve and
increase pressure until the switch opens. If light is
used, light will go out and if an ohmmeter is used, the
meter will indicate open. Open pressure on gauge.
Slowly open bleed-off valve (to decrease pressure)
until switch closes (light will light or ohmmeter will
move).
8.20 DISCHARGE PRESSURE TRANSDUCER
(CDP)
HIGH RANGE PRESSURE TRANSDUCER
-- CDP
OUTPUT VOLTAGE WITH 5V SUPPLY (VOLTS)
PRESSURE (PSIG)
Figure 8--33. Pressure Transducer Values
Table 8 -4 Suction and discharge
Pressure T ransducer Voltages
Psig Bar
Suction
voltage
Discharge
voltage
--14.5 -1.0 0.50 0.38
-- 8 . 7 -0.6 0.66 0.42
0 0 1.01 0.50
5 0.3 1.19 0.54
10 0.6 1.36 0.58
15 1.0 1.54 0.62
20 1.3 1.71 0.66
25 1.7 1.88 0.70
30 2.0 2.06 0.74
35 2.4 2.23 0.78
40 2.7 2.41 0.82
45 3.0 2.58 0.86
50 3.4 2.76 0.90
55 3.7 2.93 0.94
60 4.1 3.10 0.98
65 4.4 3.28 1.02
70 4.8 3.45 1.06
75 5.1 3.63 1.10
80 5.4 3.80 1.14
85 5.8 3.98 1.18
90 6.1 4.15 1.22
95 6.5 4.32 1.26
100 6.8 4.50 1.30