Johnson Controls Frick RWF II User Manual

RWF II ROTARY SCREW COMPRESSOR UNITS
OPERATION
070.610-IOM (JUN 11)
Page 23
Signals from the control panel operate the solenoid valve
(output module 12 on micro panel). The solenoid valve should
open when the slide valve position is 70% or greater, and
close when the slide valve position is 65% or less.
ORIFICE: The orice ensures oil supply to the inlet end bear
ings during upset conditions such as startup.
534B0325H01 1/8" RESTRICTION ORIFICE
951A0007H01 (OR H03)
SOLENOID VALVE
TO SB-2
COMPRESSOR
PORT
954A0014H01 PRESSURE-REGULATING VALVE (A4ALE)
FROM
COMPRESSOR
DISCHARGE OR
OIL MANIFOLD
BLPSPREG
FROM OIL
MANIFOLD
Figure 29 - High-Stage SB-2 Oil Supply Line Diagram
INITIAL START-UP
Initial start-up must be performed under the super vision
of a Johnson Controls-Frick authorized start-up represen-
tative to prevent voiding the compressor warranty. Prior
to the start-up, the prestart check must be accomplish ed.
See Prestart Checklist in the Forms section of this manual.
INITIAL START-UP PROCEDURE
Having performed the checkpoints on the prestart check
list (see FORMS section), the compressor unit is ready for
startup. It is impor tant that an adequate refrigerant load
be available to load test the unit at normal operating condi
tions. The following points should be kept in mind during
initial startup.
1. It is imperative that during the initial start-up of the
package that the hand expansion valve on the main oil
injection line is fully open to ensure adequate oil ow.
There is still an orice installed in the compressor to control
maximum oil ow. At initial startup of the package the hand
expansion valve must be fully open. After initial startup of
the package the hand expansion valve should be adjusted.
There are two methods of determining the correct adjust
ment of this valve.
The best method to determine target discharge temperature
is to run CoolWare™ with the operating conditions of the
compressor. The program will give you a theoretical discharge
temperature of the compressor. Once this temperature is
known, you may adjust the hand expansion valve. The ideal
discharge temperature is within 5°F + or – of the theoretical
discharge temperature. Adjust the valve to achieve the theo
retical discharge temperature. If you do not have access to
CoolWare™, 180°F is a good target discharge temperature for
a high stage ammonia compressor. Booster applications and
compressors using HFC and HCFC refrigerants may run cooler.
Compressors with high discharge pressure may run hotter.
The rst method is used for compressors with External Oil
Cooling (Thermosyphon, Water Cooled, and Glycol Cooled).
Before the initial startup of the compressor close the hand
expansion valve completely. Open the valve back up and
count the turns that it takes to fully open the valve. After
the initial startup close the valve to achieve approximately
180° F discharge temperature or the theoretical temperature
from CoolWare. Do not fully close the valve at any time while
the compressor is running.
The second method is used for compressors with Liquid
Injection Oil Cooling. Because the discharge temperature is
controlled by the Liquid Injection Thermal Expansion Valve
you will not be able adjust for the correct oil ow by using
the discharge temperature. Before the initial startup of the
compressor close the hand expansion valve completely. Open
the valve back up and count the turns that it takes to fully
open the valve. After the initial startup close the valve ½
way. If it took 10 turns to open the valve completely, then
turn it in 5 turns. If it took 7 turns to open, then close the
valve 3½ turns. Do not close the valve any further than ½
the number of turns required to fully open it.
Failure to properly adjust this valve
can lead to excessive noise and
vibration of the compressor and
package, premature failure of the bearings, liquid loading
of the rotors, liquid starvation of the rotors and cata-
strophic failure of the compressor.
2. For proper and safe operation, the compressor must be
run at the proper speed and discharge pressure. Exceeding
design conditions creates a potential hazard.
3. Rotate and lubricate motor bearings according to manu
facturer’s recommendations PRIOR to initial startup as
required.
4. After running the unit for approximately three hours, ad
just liquid injection oil cooling if applicable. If unit has water
cooled oil cooling, adjust water control valve to cooler.
5. The compressor slide valve and slide stop linear transmit
ters should be calibrated.
6. Perform vibration analysis if equipment is available.
NORMAL START-UP PROCEDURE
1. Conrm system conditions permit starting the compres sor.
2. Press the [RUN] key.
3. Allow the compressor to startup and stabilize. Press the
[AUTO] key immediately below the V ratio label on the oper
ating display screen. Press the [AUTO] key im mediately below
the SV POS label on the operating display. The compres sor
is now operating in the automa tic mode.
4. Observe the compressor unit for mechanical tightness of
the external piping, bolts and valves. Ensure that the ma
chine is clean from oil and refrigerant leaks. If any of these
occur, shut down the compressor and correct the problem
as necessary using good safety precautions.
5. RETIGHTEN MANWAY BOLTS at condenser design
pressure (while system is running).
RESTARTING COMPRESSOR UNIT AFTER CONTROL
POWER INTERRUPTION (PLANT POWER FAILURE)
1. Check variable setpoints.
2. Follow normal startup procedure.

Johnson Controls Frick RWF II Specifications

General

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