Safety
3
CAUTIONS (continued)
AVOID CONTAMINATION.
When checking the compressor for shipping damage, do not
connect gas lines and cold head. The components may become contaminated with
compressor oil.
Follow the charging or venting procedures to prevent reversed flow of system gas. Do not
charge through the supply coupling. Do not vent through the return coupling. Reversed flow
can contaminate the system with compressor oil.
A leaking coupling on an adsorber should not be repaired in the field. Consult a Service Center.
Venting the adsorber will introduce contaminants to the system, which cannot be removed in the
field.
PREVENT EQUIPMENT DAMAGE.
Damage to gas lines can result from crimping by repeated
bending and repositioning.
Always thoroughly drain the coolant from the cooling circuit if the compressor is to be shipped or
stored.
If the compressor starts but runs roughly and the supply pressure does not increase, turn it off
immediately. This is an indication that the power supply leads are connected in the wrong
phase sequence and the compressor is operating in the reverse direction. The compressor’s
circuit breaker may also trip. Disconnect the power to the compressor. Interchange any two
incoming power leads (except ground) at the compressor’s power cord plug or at the customer’s
disconnect switch. Reconnect the power and restart the compressor.
Never pull a vacuum on the compressor or on the cold head. The motors will short circuit if
started.
After starting the system for the first time, to be certain that the water lines are properly
connected, check that the outlet water temperature is warmer than the inlet water.
For an installation using a water chiller or other circulating cooling system:
Use pure ethylene glycol with water for the
coolant antifreeze solution. Do not use commercial
ethylene glycol sold for automotive cooling systems, which usually contains a fine grit material
that can damage the cooling system.
AVOID A MALFUNCTION.
Repeatedly charging the system with helium gas rather than
locating and repairing gas leaks can cause a malfunction. Impurities are introduced at an
abnormal rate and can freeze in the cold head.
Do not allow air to get into the helium gas refrigerant of the system. Moisture from the
atmosphere can seriously degrade cold head performance.
AVOID EQUIPMENT FAILURE, CONTAMINATION OR A NUISANCE SHUTDOWN.
Do not
tip the compressor greater than 5 degrees from horizontal, to avoid flowing oil into unwanted
places.
Summary of Contents for HC-4E1
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Page 55: ...Troubleshooting 51 Figure 9 HC 4E1 Wiring Diagram...
Page 56: ...Troubleshooting 52 Figure 10 HC 4E2 Wiring Diagram...
Page 57: ...Troubleshooting 53 Figure 11 HC 4E1 Electrical Schematic...
Page 58: ...Troubleshooting 54 Figure 12 HC 4E2 Electrical Schematic...
Page 61: ...Parts 57 Figure 13 Parts Identification 18 21 19 13 14 20 16...