Johnson Controls Frick RWF II 177 User Manual

RWF II ROTARY SCREW COMPRESSOR UNITS
MAINTENANCE
070.610-IOM (JUN 11)
Page 29
AS, AK, AL: Install ball bearing into bearing housing. In stall
lip seal in bearing housing end cap. The lip should face to
wards end of shaft. Put bearing spacer collar in lip seal and
install in bearing housing and tighten setscrews se curely.
See Figure 31.
15. Insert brass bar or hardwood through port opening be
tween rotor teeth to keep shaft from turning.
16. Start thrustbearing assembly into casing. Turn by hand
until tight. This forces rotor against head. Replace and tighten
locknut or shaft.
17. Remove brass bar or hardwood from port opening.
18. Adjust pump end clearance.
BEFORE STARTING PUMP, ENSURE
THAT ALL DRIVE EQUIPMENT
GUARDS ARE IN PLACE. FAILURE TO
PROPERLY MOUNT GUARDS MAY RESULT IN SERIOUS
INJURY OR DEATH.
THRUST BEARING ADJUSTMENT
See Figures 30 and 31.
Loosen two screws in face of thrustbearing assembly. If
shaft cannot be rotated freely, turn thrustbearing assembly
counterclockwise until shaft can be turned easily.
1. While turning rotor shaft, rotate thrustbearing assem
bly clockwise until noticeable drag occurs. This is zero end
clearance.
2. Mark position of bearing housing with respect to the
casing.
3. Rotate thrustbearing assembly counterclockwise the
dis tance listed below as measured on outside of bearing
hous ing.
4. Tighten two setscrews in face of bearing housing after
adjust ment is made to secure thrustbearing assembly posi
tion.
For viscosities above 2500 SSU, add additional end clearance
(0.004" for GG, HJ and HL size pumps and 0.005" for AS, AK
and AL size pumps).
Pump Distance (in.) on O.D. End Clearance
Size of Bearing Housing (in.)
GG 7/16 .003
HJ, HL 9/16 .003
AS, AK, AL 1/2 .003
INSTALLATION OF
CARBON GRAPHITE BUSHINGS
When installing carbon graphite bushings, extreme care must
be taken to prevent breaking. Carbon graphite is brittle and
easily cracked. If cracked, the bushing will quickly disinte
grate. Using a lubricant and adding a chamfer on the bushing
and the mating part will help in installation. The additional
precautions listed below must be followed for proper instal
lation:
1. A press must be used for installation.
2. Be certain bushing is started straight.
3. Do not stop pressing operation until bushing is in proper
position. Starting and stopping will result in a cracked bush
ing.
4. Check bushing for cracks after installation.
TROUBLESHOOTING THE DEMAND PUMP
BEFORE OPENING ANY PUMP LIQUID
CHAMBER (PUMPING CHAMBER,
R E S E R V O I R , J A C K E T
ETC.) ENSURE:
1. THAT ANY PRESSURE IN CHAMBER HAS BEEN COM-
PLETELY VENTED THROUGH SUCTION OR DISCHARGE
LINES OR OTHER APPROPRIATE OPENINGS OR CONNEC-
TIONS.
2. THAT THE DRIVING MEANS (MOTOR, TURBINE, EN-
GINE, ETC.) HAS BEEN “LOCKED OUT” OR MADE NON-
OPERATIONAL SO THAT IT CANNOT BE STARTED WHILE
WORK IS BEING DONE ON PUMP.
FAILURE TO FOLLOW ABOVE LISTED PRECAUTIONARY
MEASURES MAY RESULT IN SERIOUS INJURY OR DEATH.
Mark valve and head before disassembly to ensure proper
reassembly.
If trouble does develop, one of the rst steps toward nd
ing the difculty is to install a vacuum gauge in the suction
port and a pressure gauge in the discharge port. Readings
on these gauges often will give a clue as to where to start
looking for the trouble.
Vacuum Gauge—Suction Port
1. High reading would indicate:
a. Suction line blocked  foot valve stuck, gate valve
closed, strainer plugged.
b. Liquid too viscous to ow through the piping.
c. Lift too high.
d. Line too small.
2. Low reading would indicate 
a. Air leak in suction line.
b. End of pipe not in liquid.
c. Pump is worn.
d. Pump is dry  should be primed.
3. Fluttering, jumping, or erratic reading:
a. Liquid vaporizing.
b. Liquid coming to pump in slugs  possibly an air leak
or insufcient liquid above the end of the suction pipe.
c. Vibrating from cavitation, misalignment, or damaged
parts.
Pressure Gauge - Discharge Port
1. High reading would indicate:
a. High viscosity and small and/or long discharge line.
b. Gate valve partially closed.
c. Filter plugged.
d. Vertical head did not consider a high specic gravity
liquid.
e. Line partially plugged from buildup on inside of pipe.
f. Liquid in pipe not up to temperature.
g. Liquid in pipe has undergone a chemical reaction and
has solidied.
h. Relief valve set too high.

Johnson Controls Frick RWF II 177 Specifications

General

Brand	Johnson Controls
Model	Frick RWF II 177
Category	Air Compressor
Language	English