Frick SGXH-4021 - Preparing Compressor for Storage

070.650-IOM (JUL 19)
Page 5
SGC/SGX ROTARY SCREW COMPRESSOR
INSTALLATION - OPERATION - MAINTENANCE
PREPARING COMPRESSOR FOR STORAGE
If it is necessary to store the compressor for use at a later
date, peform the following steps:
1. Evacuate the compressor to remove moisture.
2. Connect the evacuation lines to port SM1.
3. Connect the evacuation lines to the three Schrader ac-
cess valves provided with the compressor. One valve is
connected to the compressor suction and the other two
valves are located at the block on the cylinder.
4. Break vacuum with dry nitrogen and bring pressure to 0
psig .
5. Pump oil into the SM1. Johnson Controls-FRICK rec-
ommends break-in oil P/N 111Q0831809 for storage
purposes. The amounts of oil needed for each compres-
sor are:
193 mm 12 gal 355 mm 35 gal
233 mm 15 gal 408 mm 50 gal
283 mm 25 gal
6. After the compressor is oil charged, pressurize to 15 psig
with nitrogen.
MAINTAINING COMPRESSOR IN STORAGE
• Ensure that the 5 psig to 15 psig nitrogen charge is
maintained. 15 psig is preferred.
• Rotate the male rotor shaft every two weeks. Mark the
shaft to ensure the rotor does not return to the original
position.
• Store the compressor inside a dry building environ-
ment.
• Grease the male rotor shaft to prevent rust.
• Record all information in a Compressor Long Term
Storage Log.
Contact Johnson Controls-FRICK Service with any
questions regarding long term storage.
DESCRIPTION
SGC/SGX COMPRESSORS
FRICK SGC/SGX rotary screw compressors utilize mating
asymmetricalprolehelicalrotorstoprovideacontinuous
owofvapor,designedforbothhigh-pressureandlow-
pressure applications. The compressors incorporate the
following features:
• High-capacity roller bearings to carry radial loads at
both the inlet and outlet ends of the compressor.
• Heavy-duty, four-point contact ball or angular-contact
bearings are mounted at the discharge end of the com-
pressor to carry axial loads.
• Balance pistons, located in the inlet end of the com-
pressor, reduce axial loads on the male axial bearings
to increase bearing life.
• Moveable slide valve to provide fully modulating capac-
ity control from 100% to approximately 10% (2824,
3519, and 4021 - to 15%; 3524 - to 20%) of full load
capacity.
• Volumizer
®
volumeratiocontroltoallowinnitely
variable volume ratio (Vi) from 2.2 to 5.0 for most SGC
models during compressor operation:
- 2824, Vi = 2.0 to 4.1
- 3524, Vi = 2.4 to 4.5
- 4021, Vi = 2.2 to 4.3
• A hydraulic cylinder to operate the slide stop and slide
valve.
• For SGC/SGX models up to 355, housings constructed
of class 40 grey cast iron have a design working pres-
sure (DWP) of 400 psig. Those contrusted of ductile
iron or steel are rated for a DWP of 600 psig. For 408
compressors, 4013 models are rated for 700 psig, while
4018 and 4021 models are rated for 600 psig.
• Bearing and control oil vents to closed thread in the
compressor instead of suction pressure to avoid per-
formance penalties from superheating and displacing
suction gas.
• Shaft seal housing is designed to maintain operating
pressure on seal well below discharge pressure for
increased seal life.
Table 2: Compressor and packaged equipment storage log
Compressor* Rotor Visual
shaft rotation housing Charge inspection
Checked
by
Model Serial no. 1 1/2 Turn charge added per QAI-3 Charge Date
*Compressor, Motor, Oil Pump, and Refrigerant Pump
removed 95, 120 and 613
mm as they were not SGC/C
compressors