Installation
2. Be sure the power switch on the compressor is off. Plug the power cord into customer's
electrical receptacle. Switch on the power to the compressor. Check that the circuit breaker
is closed.
3. Press the power switch on the compressor. Power switch indicator will light and the
compressor will start. The water solenoid valve (in some compressor models) will open.
Check water lines for leaks. Tighten the fittings if necessary.
An internal by-pass valve will open to prevent overloading the motor when the
system gas lines are not connected to the compressor.
PREVENT EQUIPMENT DAMAGE. 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.
4. When the pressures stabilize, read the supply pressure gauge. The pressure should match
the operating supply pressure in the Specifications section of the Compressor manual.
5. Run the compressor for 10 minutes, then stop.
This completes the checkout of the compressor.
Remove the Existing Pumping System
AVOID CONTAMINATION. If the cryopump is replacing an oil-diffusion pump,
remove all oil residues from the gate valve.
If the Marathon
®
CP-8 Cryopump is replacing an oil-diffusion pump, the oil-diffusion pump must
be removed and the remaining equipment must be cleaned before installation of the cryopump.
1. Disconnect all utilities from the existing pumping system.
2. Remove the oil-diffusion pump from the flange of the vacuum chamber.
3. With a lint-free cloth, clean the gate valve, mounting flange and vacuum chamber using a
solvent recommended for oil and grease removal in high-vacuum service.
4. Be sure the control logic of the system will operate safely and properly after the installation
of the cryopump. Changes to the electrical system should be made only by a qualified
electrician.
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