Bunn CDS-3 - Manual (Page 46)

46
FIG.45 SOLENOID TERMINALS P1327
SERVICE (cont.)
SOLENOIDS
R2
2
FIG. 44 SOLENOIDS
P1342
Location:
The solenoids are mounted on a bracket that is
attached on top of the chassis on the left side.
Test Procedures:
1. Disconnect the dispenser from the power source.
2. Disconnect the white/black wire from the solenoid
to be tested and the orange wire from the left
solenoid, the violet wire from the right solenoid or
the white/violet wire from the center solenoid.
3. With a voltmeter, check the voltage across the
white/black wire and the other wire with the ON/
OFF switch in the “ON” position and the appropri-
ate ICE/OFF/NO-ICE switch in the “ICE” or “NO-
ICE” position. Connect the dispenser to the power
source. The indication must be:
a) 120 volts ac for 120 volt models.
b) 230 volts ac for 230 volt models.
4. Disconnect the dispenser from the power source.
If voltage is present as described, proceed to #5
If voltage is not present as described, refer to the
Wiring
Diagram and check the dispenser main wiring harness.
5. Check for continuity across the solenoid valve coil
terminals.
If continuity is present as described, reconnect the
wires to the solenoid.
If continuity is not present as described, replace the
solenoids.
6. Check the solenoid valve for coil action. Connect
the dispenser to the power source. With the auger
motor switch in the “ON” position and the ON/OFF/
ICE switch in the “ICE” or “NO-ICE” position press
the ON/OFF switch to the “ON” position. After
approximately two minutes listen carefully in the
vicinity of the solenoid valve for a “clicking” sound
as the coil magnet attracts.
7. Disconnect the dispenser from the power source.
If the sound is heard as described and the refrigerant
will not pass through the solenoid valve, there may
be a blockage in the refrigerant line before the sole-
noid valve, or the solenoid valve may require inspec-
tion for wear, and removal of particles.
If the sound is not heard as described, replace the
solenoids.
Removal and Replacement:
NOTE: Before removal of any refrigeration component
the refrigerant in the system must be reclaimed by a
licensed refrigeration repair person.
1. Disconnect the wires from both solenoids.
2. Disconnect the refrigerant lines from the sole-
noids to the cooling drums and the refrigerant line
from the accumulator.
3. Remove the #6 hex crimptite securing solenoid
bracket to the dispenser chassis.
4. Remove bracket and solenoids from the chassis
assembly.
5. Remove the four #8-32 locking screws securing
the solenoids to the bracket.
6. Remove solenoid and repair or discard.
7. Install new solenoid on mounting bracket using
four #8-32 locking screws.
8. Reinstall mounting bracket and solenoids inside
the dispenser chassis, securing with a #6 hex
crimptite screw.
9. Reconnect the tubes from the accumulator and the
cooling drums.
10. Refer to Fig. 45 and reconnect the wires.
11. Evacuate the system.
12. Recharge the system with the appropriate coolant
and to the pressures directed on the decals
NOTE: The charging of the system must be done by a
licensed refrigeration repair person.
27646 122200