Vollrath STOELTING U421-I2A, Руководство по обслуживанию

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Service Manual #513721 15 U421-I2A & U431-I2A Model Machines
4. Disconnect the bleeder resistor from the circuit.
5. Measure the capacitance across the terminals.
The results should be as follows:
B. CAPACITOR REPLACEMENT
1. Disconnect machine from electrical supply before
removing any panels for servicing.
2. Remove leads from the capacitor terminals.
3. Using insulated pliers, discharge the capacitor
with a 20K

5W resistor across the terminals.
NOTE
Discharge the capacitor even if there is a bleeder
resistor across the terminals. There may be an open
in the bleeder resistor preventing it from working
properly.
4. Pull the capacitor out of its holder and replace.
5. Connect the leads to the terminals of the new
capacitor.
3.5 GEARBOX
A. GEARBOX INSPECTION
Inspect the gearbox and listen for unusual noise. A grind-
ing sound generally indicates a bad gear.
B. GEARBOX REMOVAL
1. Disconnect machine from electrical supply before
removing any panels for servicing.
2. Remove the back panel and the side panel.
3. Remove the belts.
4. Remove the bolts holding the gearbox assembly
and remove it.
C. GEARBOX INSTALLATION
1. Place the gearbox in position from the rear of the
machine. Fasten the bolts through the gearbox
to the rear of the barrel.
2. Mount the pulley on the gearbox shaft and align
with the motor pulley, then tighten the allen head
screws.
3. Install the belt.
4. Use a Burroughs Belt Tension Gauge to set the
tension for the drive belt. Set the belt tension to
55-60 lbs.
5. Using a straightedge, align the drive motor pulley
with the gearbox pulley. Tighten the two allen
head screws.
3.6 CONDENSER FAN MOTOR (AIR-COOLED
ONLY)
The fan motor is connected to a toggle switch mounted to
the evaporator behind the right side panel. The switch is
connected to a buck-boost transformer. The switch must
be set to the correct position based on input voltage.
The buck-boost transformer is connected to an overload
protector. This protects against the switch being in the
wrong position, a faulty switch and/or wiring issues.
A. CHECK VOLTAGE
1. With the machine connected to power and the
main power on, press the right arrow, SET, then
the SEL button to access the technician level on
the control.
2. Go to the Performance screen. Refer to the
IntelliTec2 manual for details.
3. If the Input Voltage listed on the Performance
screen is 215VAC or less, set the toggle switch
to 208. If the voltage is above 215VAC, set the
toggle switch to the 230.
NOTE
The voltage reading must be taken to ensure the
fan motor works properly.
B. FAN MOTOR REPLACEMENT
1. Disconnect machine from electrical supply before
removing any panels for servicing.
2. Remove the right side panel and the header panel.
3. Trace and disconnect the fan motor wires behind
the header panel.
4. Remove the fan guard and the fan motor assembly.
5. Remove the torx screws from the fan guard.
6. Remove the bolts holding the fan guard to the
condenser shroud.
WARNING
Hazardous voltage
Make sure the machine is off when disassembling
for servicing. The machine must be disconnected
from electrical supply before removing any access
panel. Failure to disconnect power before servicing
could result in death or serious injury.
Rating
Capacitor Part MFD VAC
Cab Compressor 230667 80 MFD 220 VAC
Compressor - Run 231047 45 MFD 370 VAC
Compressor - Start 230638 88-106 MFD 330 VAC
Drive Motor - Run 231075 30 MFD 370 VAC
Drive Motor - Start 230622 200 MFD 250 VAC
Fan Motor 230654 5 MFD 400 VAC
Pump Motor 1171960 15 MFD 370 VAC