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T-359
7–10
y. Connect the green ground wire to the grounding tab located inside the terminal box of the compressor using
the self-tapping grounding screw. Close the compressor terminal box using the terminal cover removed in
step 20 above.
z. Backseat all service valves.
aa. Replace the compressor cover.
ab. Connect the power to the unit and run it for at least 20 minutes.
ac. Perform a leak check of the system.
7.5
HIGH PRESSURE SWITCH
7.5.1
Checking High Pressure Switch
CAUTION
!
Do not use a nitrogen cylinder without a pressure regulator. Do not use oxygen in or near a
refrigeration system as an explosion may occur.
NOTE
The high pressure switch is non-adjustable.
a. Remove switch as outlined in
.
b. Connect ohmmeter or continuity light across switch terminals. Ohmmeter will indicate no resistance or con-
tinuity light will be illuminated if the switch closed after relieving compressor pressure.
c. Connect hose to a cylinder of dry nitrogen. (
Figure 7.6 High Pressure Switch Testing
d. Set nitrogen pressure regulator at 26.4 kg/cm
2
(375 psig) with bleed-off valve closed.
e. Close valve on cylinder and open bleed-off valve.
f. Open cylinder valve. Slowly close bleed-off valve to increase pressure on switch. The switch should open at
a static pressure up to 25 kg/cm
2
(350 psig). If a light is used, light will go out. If an ohmmeter is used, the
meter will indicate open circuit.
g. Slowly open bleed-off valve to decrease the pressure. The switch should close at 18 kg/cm
2
(250 psig).
1. Cylinder Valve
and Gauge
2. Pressure Regulator
3. Nitrogen Cylinder
4. Pressure Gauge
(0 to 36 kg/cm
2
=
0 to 400 psig)
5. Bleed-Off Valve
6. 1/4 inch Connection
1
2
3
4
5
6
Содержание 69NT40-561-019
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