Vilter VSM 71-701, Operation And Service Manual

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80
Service
GEAR MOTOR TO OPTICAL SLIDE
VALVE ACTUATOR CONVERSION,
REMOVAL OF GEARMOTOR
A) Follow appropriate lock out tag out proce-
dures to shut off the electricity to the mi-
croprocessor.
B) Remove the six hex head cap screws that
secure the slide valve actuator cover. Remove
cover and gasket.
C) Disconnect the motor and potentiometer
leads.
D) Remove the four 5/16” hex head cap screws
holding the motor support to the mounting
plate. Remove the gear motor assembly.
E) Remove the ¼” retaining nut, washer and
plastic gear from the end of the command
shaft. Loosen the set screw securing the
large drive gear to the command shaft. Re-
tain drive key for possible re-use with new
actuator assembly.
GEAR MOTOR TO OPTICAL SLIDE
VALVE ACTUATOR CONVERSION,
INSTALLATION OF ACTUATOR
A) Remove the four self tapping screws that
secure the side covers to the actuator bracket.
This will allow access to the actuator shaft.
B) On certain units with economizer, the ac-
tuator bracket may have to be rotated from
its original position with the motor. To ac-
complish this remove the four hex head cap
screws holding the bracket to the motor.
Rotate the motor from the original posi-
tion.
Make sure the electrical connections
on the actuator are not to the top position .
This will allow enough clearance between
the motor and economizer line.
C) The four #10 holes in the existing mounting
plate that will be utilized to attach the actua-
tor must be in good condition. A 10-24 N.C.
tap can be utilized to clean out the threaded
holes.
D) Install the key in the command shaft keyway.
E) Slide the actuator assembly on to the com-
mand shaft. Align one of the two key slots
in the actuator shaft with the key on the com-
mand shaft. Make sure that the collar re-
mained on the actuator shaft. Due to the
position of the slide valve in the compres-
sor, use of the other key slot may be required
to align the bracket holes with the threaded
mounting plate holes.
F) Slide the collar until it is flush with the end
of the actuator shaft. Check to make sure
the key is fully inserted in the actuator shaft.
The key should be flush with the end of the
actuator shaft.
G) Tighten the shaft collar ¼” socket head cap
screw to 16 ft/lbs. (192 in/lbs.). Failure to
correctly torque the locking screw may re-
sult in a failure of the actuator.
H) Install the side covers to the bracket with
hex washer head self tapping screws.
I) Refer to the slide valve actuator calibration
instructions in the Vission/Vantage manual
or the instructions packed with actuators on
calibration procedures
4.05 COMMAND SHAFT ASSEMBLY
REMOVAL
The following steps can be used to remove or
install either the capacity or volume command
shaft assemblies.
A) Prepare the compressor for servicing as out-
lined in section 0.01.
B) Follow the appropriate instructions to re-
move control actuator as outlined in sections
4.01 or 4.10.