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APi 748 V1.1 406
5.1
P/N 77500001
Back
Section 5: Maintenance
INTRODUCTION
This section explains, in general, the Delivery
Door/Turret Interlock safety system and certain
procedures for component replacement. It also
provides information on cleaning and
maintenance.
DELIVERY DOOR OPERATION
Each Delivery Door assembly contains a
locking/unlocking system, two microswitches, and
the Delivery Door return spring (
see Figure 5-1
).
When a customer slides a Delivery Door towards
its open position, it will first release the door
switch, and a signal will be sent to the Control
Computer. This switch is wired so that when it
opens, it will automatically cause the Turret
Interlock Relay to open, thus positively preventing
the drum motor from being energized.
If there is adequate credit (and the item was not
previously sold), the control will energize the door
unlock solenoid which will retract the door locking
block and allow the door to be fully opened.
When the door unlock solenoid is energized, the
door unlock switch will provide a signal to the
Control to indicate that the door is unlocked. All of
the door unlock switches are wired to cause the
turret interlock relay to open also; this provides yet
a second protection from turret movement while
any door might be open.
Fig 5-1 - Delivery Door Switch
After the door is opened, there is a delay, after
which the Control will release the door unlock
solenoid which will cause the door to be locked
after it closes again. However, until the customer
moves the turret or inserts more money, he/she
can reopen the same door again and again
without restriction.
CHECKING THE REFRIGERATION SYSTEM
If the refrigeration system compressor is
inoperative, perform the following checks before
replacing the compressor. Be sure to hold the
Refrigeration Interlock switch closed when making
the operational checks.
1. Measure the line voltage. If the line voltage is
below 105 volts (for 115 VAC units) or 208 volts
(for 220/240 VAC units), the compressor may fail
to start.
2. If the line voltage is correct, check the
automatic control thermostat operation by
connecting a jumper wire across the terminals
with the power disconnected. Power back on and
verify if compressor runs.
3. The Start Capacitor, Run Capacitor, and Start
Relay are best tested by substituting them with
known good components. This way there can be
no doubt of the test results.
4. Check the Thermal Overload for continuity.
5. Check the compressor motor windings with a
Volt/Ohm meter. Set the meter on the R x 1 scale.
(Readings should be within 10% of listed)
Test Points
115Vac
230Vac
Common to Start
5 ohms
11 ohms
Common to Run
1 ohm
2 ohms
Start to Run
6 ohms
8 ohms
6. Check for grounded winding with the Volt/Ohm
meter attached between the Start and the metal
casing of the compressor. There should be no
NOTE:
The entire Refrigeration Unit may be removed
from the vendor and run on the bench to
troubleshoot any given problem. Plug the
connector from the Cold Control Thermostat
to the connector coming from the
Capacitor/Relay box.
DO NOT allow the unit to run for extended
periods of time because the Evaporator may
freeze.
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