Welbilt MERRYCHEF conneX User Manual

3 Technical data
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Merrychef conneX
®
service and repair manual 28
Description
Features
Function
Rating
Trouble shooting
Convection Motor
The convection motor
is a 3-phase AC motor
that runs at variable
speeds and is powered
by a motor speed
controller (VFD Drive).
The windings are
thermally protected
(two grey wires). The
fan will continue to run
until the oven is
switched off (Idle fan
speed reduces to 30%
once cooled down to
100
o
C & below).
Provides variable
percentages of airflow
that is heated into the
oven cavity used for
accelerated cooking.
This is the convection
and impingement
process.
Supply Voltage: DC
square wave frequency
that simulates 3ph
voltages up to 220V at
100%
Resistance: 7.5Ω ±10%
across windings
Check for opens, shorts
or grounds
Check for locked rotor
(Power Off)
Follow VFD Drive
Trouble shooting
checks.
Convection Motor IP
Thermal Switch within
the Convection Motor.
Two black wires.
Normally Closed,
monitors convection
fan motor internal
temperature. Opens
when the motor gets
too hot
Breaks connection
between wires 82 & 83
for the relay coil on the
on the VFD Drive Live
supply, which in turn
stops the voltage
supply to the
convection fan motor.
Switched Voltage;
120VAC
Resistance if open O.L.,
if closed = 0Ω
Opens at 160
o
C (320
o
F)
Check continuity
through switch.
Check convection fan
motor IP connections
on VFD. Follow
Convection Motor
Trouble shooting
checks
Overheat Thermostat
(Over Temp Stat /
Cavity Stat)
Manual reset, capillary
tube, normally closed,
monitors cavity
temperature. Opens
when the cavity
temperature gets too
hot
Breaks control safety
circuit control voltage
signalling the IO Board
to de-energise heating
and microwave circuits
based on the
temperature inside
oven cavity. The oven
shuts down and
displays E104.
Switched Voltage;
12VDC.
Resistance if open O.L.,
if closed = 0Ω.
Opens at 300
o
C (570
o
F)
Check continuity
through switch.
Check for 12VDC on
both sides of switch.
Terminals are normally
closed, if open, reset
thermostat and test
oven for proper
operation
Check IO X512
Check IO LEDs LD14 to
LD18
Magnetron Limit Stat(s)
Automatic reset.
Monitors surface
temperature. Normally
Closed, opens when
the magnetron surface
temperate gets too hot
Breaks control safety
circuit control voltage
signalling the IO Board
to de-energise heating
and microwave circuits
based on the
temperature of the
magnetron case. The
oven shuts down and
displays E117, E118.
Switched Voltage;
12VDC.
Resistance if open O.L.,
if closed = 0Ω.
Opens at 125
o
C (257
o
F),
automatically closes
once magnetron case
temperature drops to
80
o
C (177
o
F)
Check continuity
through switch(es).
Check for 12VDC on
both sides of
switch(es).
Allow magnetron to
cool before testing.
A dirty air filter is a
major root cause of
this failure
Check IO connections
& plugs on X513 &
X514
Check IO LEDs LD16 &
LD18

Welbilt MERRYCHEF conneX Specifications

General

Brand	Welbilt
Model	MERRYCHEF conneX
Category	Commercial Food Equipment
Language	English