OWNER’S MANUAL
MODEL VT18 - VERTICAL CONTACT TOASTER
148665 RV092314 5
Copyright 2012 Marshall Air Systems, Inc.
All Rights Reserved.
QUALIFIED SERVICE TECHNICIAN CHECK:
A) Check that there is power at receptacle. Verify voltage is correct based upon the voltage listed on
the toaster nameplate.
B) WITH POWER OFF check connections inside of plug. Remove right side panel and check wiring.
Any wires or terminals with burns or discoloration from arcing should be replaced. All wiring, if
replaced, should be same or higher rated wire.
C) Check sensors to see if ohm readings correct. At room temperature (70˚F), should be nominal
1.09K ohms.
D) With toaster off, check for continuity across the solid state relay terminals #1 and #2. Normal
readings are in megohm range. If reading ohms, relay has failed closed and will not cycle.
E) Control Generation 2 if no LED on display, check for .5 amp transformer fuses. If fuses good,
check for 208 volts on terminals 1 and 6, then 18 Vac on 11 and 12. If 208 volts is present and no
18 Vac output, replace transformer.
2. PROBLEM: Conveyor belts move but no heat.
SOLUTION:
QUALIFIED SERVICE TECHNICIAN CHECK:
A) Check that there is power at receptacle. Verify voltage is correct based upon the voltage listed on
the toaster nameplate.
B) Check for loose connections at terminal strip and temperature terminals (see schematic).
C) Verify that the heater and sensor wires are connected to the controller.
D) Replace all connections or components that have damaged terminals. Replace any damaged
wiring with same or higher rated wire.
E) Check the resistance of the sensor(s). If sensor is open, replace. At room temperature (70˚F),
should be nominal 1.09K ohms.
F) Check voltage into solid-state relays. The voltage input from module should be approximately
5Vdc. Voltage to heater should be 208 or 240Vac.
G) Check the resistance of the heater platens: 24 ohms at room temperature.
H) Control Generation 2 – Check for 24Vdc to the heater relay (R1, R2) from the control board. If
getting 24Vdc from the control board, check for 208 volts on output side of relay. If no 208 volts
then replace relay. If there is 208 volts, then possible solid state relay problem.
3. PROBLEM: Heater platens are hot, control says LO or RDY, conveyor belts do not move.
SOLUTION:
A) Make sure carriage is seated in saddles and top slots are around locator pins.
B) Remove conveyor carriage and turn conveyors by hand and determine there is no binding due to
dropping carriage.
C) Make sure all setscrews on gears are tight.
D) Check motor to make sure it is turning with carriage removed.
E) Increase belt tensioning by loosening tension bracket screws, push toward end as you retighten
screws. If bracket is at the end of adjustment, it is necessary to remove one conveyor link. See
Figure 5.
F) Conveyor carriage has been dropped, bent. Replace carriage.
QUALIFIED SERVICE TECHNICIAN CHECK:
A) Check that there is power at receptacle. Verify voltage is correct based upon the voltage listed on
the toaster nameplate.
