T-372
7–10
20. Open the compressor terminal cover and connect the compressor power cable following the steps below:
a. Liberally coat the orange gasket surfaces with the Krytox lubricant.
b. Install the orange gasket part onto the compressor fusite with the grooved or threaded side out. Ensure
that the gasket is seated onto the fusite base.
c. Coat the inside of the power plug (female) connector pins with the Krytox lubricant, and insert the plug
onto the compressor terminal connections. Make sure the orange gasket has bottomed out onto the
fusite and fits securely onto the terminal pins while fully inserted into the orange plug.
d. 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.
21. Backseat all service valves, connect the power to the unit and run for at least 20 minutes.
22. Perform a leak check of the system.
7.10 High Pressure Switch
7.10.1
Checking High Pressure Switch
WARNING
!
Do not use a nitrogen cylinder without a pressure regulator.
NOTE
The high pressure switch is non-adjustable.
1. Remove switch as outlined in
.
2. Connect ohmmeter or continuity light across switch terminals. Ohm meter will indicate no resistance or
continuity light will be illuminated if the switch closed after relieving compressor pressure.
3. Connect hose to a cylinder of dry nitrogen (see
).
Figure 7.6 High Pressure Switch Testing
1) Cylinder Valve
2) Cylinder Gauge
3) Pressure Regulator
4) Nitrogen Cylinder
5) Pressure Gauge
(0 to 36 kg/cm2 = 0 to 400 psig)
6) Bleed-Off Valve
7) 1/4 inch Connection
- - - - -
4. Set nitrogen pressure regulator at 26.4 kg/cm
2
(375 psig) with bleed-off valve closed.
5. Close valve on cylinder and open bleed-off valve.
6. 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, the light will go out. If an ohmmeter is used,
the meter will indicate open circuit.
7. Slowly open bleed-off valve to decrease the pressure. The switch should close at 18 kg/cm
2
(250 psig).
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3
4
5
6
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