Wittern VendNet 3576M - Relay Functions and Door Switch; Relay Description and Control; Door Switch Functionality

MULTI- ZONE / FROZEN FOOD VENDOR • 3576 • 4222618A | 27
RELAYS
The program controls four relays which then control the refrigeration and heating systems:
• RELAY1 - controls the compressor and the condenser fan (refrigeration system).
• RELAY2 - controls the upper zone blower / heater & evaporator fan via the door switch.
• RELAY3
- controls the defrost heater and evaporator fan.
• RELAY4
- controls the upper zone heater when configured as MZF
NOTE: For more information regarding the Power Panel, please refer to schematic.
DOOR SWITCH
The door switch is located in the upper left hand corner of the vending machine door. See
Figure 8c.
• If the vending machine is plugged in and the power
switch is on and the door is open
, then the
compressor, evaporator fan, heater and heater fan are
all turned off. A 30 minute door timer starts and a
compressor delay timer starts.
• If the door is open for more than 30 minutes, the
controller will resume closed door
operation, the
message DOOR OPEN is displayed and error code
(VMC 7) is set. The DIAGNOSE menu will also display
the current state of the door swi
tch after all other
messages (if any) are displayed. DOOR is displayed if
the door switch is in the “door open position” and no
message is displayed if the door switch is in the “closed
door position”.
Figure 8c. Door Switch
If a defrost cycle is in progress (compressor off and defrost DURATION timer on) and
the door is opened, then the DURATION timer continues while the door is open.
The HEALTH SAFETY feature prevents the sale of perishable food if the air
temperature inside the top zone (
SENSOR3) rises above the health safety
temperature limits for cold food products (41°F / 5°C) for more than 15 minutes
and in the bottom zone
(SENSOR1) if the temperature rises above the health
safety temperature limits for frozen food products (0°F/-18°C) for more than 15
minutes.
NOTE: The time requirements for the COLD setting do not apply for 30 minutes and
75 minutes for FROZEN immediately following vending machine filling or
servicing.
IMPORTANT! The operator is responsible for setting the health safety at the correct
level and selection range for the product being vended.
Refer to the GVC2 Programming Manual (p/n 4215507) for additional instructions on how
to set the Sensor1&3 Health Safety Level and Sensor1&3 Health Safety Range.