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- SELECT PROGRAM -
Operation
Overview
Normal
Lights, alarms and fans
Sabbath
Sabbath Mode
30” All Refrigerator
Schematic
COOLING OPERATION
This is the Schematic Diagram for
the 30” All Refrigerator.
In order to begin this training
move the cursor over the Main
Power Switch. Using your mouse,
left Click the switch to begin.
30” All Refrigerator
Schematic
COOLING OPERATION
When the Main Power switch is
turned on, Line Voltage and
Neutral are sent to the High
Voltage board. Line Voltage is
supplied at E10 (L) and Neutral is
supplied at E9 (N). This supplies
the on-board transformer to
provide DC operating voltage.
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
The N.C. Light Relay supplies Neutral
to the cavity lights and the Sabbath
Mode Relay.
When set to Sabbath Mode via the
Keypad input, the Light relay is
energized. This removes the Neutral
side from the cavity lights and
Sabbath relay coil.
This is explained under the Sabbath
Mode Section
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
Line Voltage is also supplied from
the Main Power switch to E3. This
is the common Line voltage feed
for the Compressor Relay and the
Evaporator Fan relay.
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
When the unit is switched ON and the
temperature is set, the DC Fan Relay
energizes and sends 30 VDC from E1
to Terminal # 4 in the Temperature
Translator. This is connected to the
coil of the SPDT relay.
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
30 VDC enters the Temperature
translator and the internal relay
energizes. The Relay contact closes to
the Normally open contact
ADVANCE
< 180k Ω
30” All Refrigerator
Schematic
COOLING OPERATION
With the relay engaged, the 180k Ω
resistor is brought into the circuit The
board reads this as a temperature of
approximately 11° F.
The LV board thinks the simulated
Freezer is too warm and will turn on
the cooling system.
ADVANCE
30” All Refrigerator
Schematic
< 3.5 volts D.C.
COOLING OPERATION
The L.V board will now close the
compressor relay on the H.V. board.
120 volts is sent to the inverter and
the condenser fan motor.
Click mouse to advance
At the same time 3.5 Volts D.C is
sent to the inverter
Click mouse to advance
The compressor and condenser
fan motor will begin operation
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
At the same time that the compressor
and condenser fan motor are running,
the evaporator fan relay also closes.
Click mouse to advance
120 volts is sent to the upper door
switch (N.O.) as well as the N.C.
contact of the Sabbath mode relay
Click mouse to advance
From there, the voltage enters the
temperature translator and supplies
primary voltage to the internal
transformer
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
With power supplied to terminals 1 (L)
and 2 (N) of the internal transformer of
the Temperature Translator , 24 VDC is
produced on the secondary side at
terminals #5 and #6.
Click mouse to advance
24 volts is sent to the upper and lower
cavity fan motors. The fan motors
activate and begin to circulate air
throughout the compartment.
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
When the Fresh Food Compartment is
cold enough, the thermistor is read by
the LV Board. The L.V. board will now
need to cycle off the fans and the
compressor.
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
The L.V. board now opens the DC fan
relay, removing the 30 volts being sent
to the internal relay, terminal #4 of the
temperature translator.
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
The relay now closes the N.C. contact.
This removes the 180k resistor from
the circuit and brings the 560k on-line.
ADVANCE
< 560k Ω
30” All Refrigerator
Schematic
COOLING OPERATION
With the relay engaged, the 560k Ω
resistor is brought into the circuit The
board reads this as a temperature of
approximately -23° F.
The L.V board interprets this as a
satisfied Freezer Thermistor and will
now shut off the cooling system.
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
The L.V. board now opens both the
compressor relay and the evaporator
fan relay.
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
With the compressor relay open, we no
longer have 120 volts to the compressor
and condenser fan motor.
ADVANCE
30” All Refrigerator
Schematic
COOLING OPERATION
At the same time, the Evaporator fan
relay also opens. With the primary
voltage removed from the Temperature
Translator, we remove our 24 VDC to
the evaporator fans.
The unit has now shut off.
ADVANCE
In Normal operation, the Light Relay is
always closed. This provides constant
Neutral for the cavity lights and the
Sabbath Mode Relay
When the Sabbath Mode is activated
via the keyboard program, the Light
Relay on the H.V. Board is energized.
This causes the N.C. contact to Open.
ADVANCE
30” All Refrigerator
Schematic
SABBATH MODE
When the Sabbath Mode is activated,
the relay will energized and the N.C.
contact will open.
As you can see, we no longer have a
neutral feed to the cavity lights or the
Sabbath Mode relay. The light relay will
stay engaged until the unit is taken out
of Sabbath Mode.
ADVANCE
30” All Refrigerator
Schematic
SABBATH MODE
In Normal Mode operation, when the
unit is operating (Compressor,
Condenser fans and evaporator fans)
and you open the door, the cavity
lights come on and the evaporator fan
stops.
Above we have the door closed and
the cavity fans are running. The
Compressor and condenser fans are
running as well.
Lets see what happens we the door is
opened.
ADVANCE
30” All Refrigerator
Schematic
SABBATH MODE
With the door open, The lower Light
switch closes and sends line voltage to
the cavity lights.
We have voltage present BUT because
the light relay is open there is no
neutral return so the lights do not
operate.
Click mouse to advance
ADVANCE
30” All Refrigerator
Schematic
SABBATH MODE
At the same time that voltage is being
sent to the cavity lights, it is also being
sent to the coil of the Sabbath Mode
relay.
Click mouse to advance
With no Neutral return to the coil, the
NC contacts in the relay remain closed.
So even though the fan switch contacts
are open, we still have a closed circuit
to the Primary coil of the Temperature
Translator fan transformer.
ADVANCE
30” All Refrigerator
Schematic
SABBATH MODE
Therefore, when the unit is set to
Sabbath Mode, the lights will not turn
on and the cavity fans will continue to
run with the door open.
Also in Sabbath Mode the door open
alarm feature is disabled.
ADVANCE
30” All Refrigerator
Schematic
Lights, alarms and fans
When ever the door is opened, the fans
will shut off (AR units only) and the
lights will turn on.
Click the Door Light Switch to open the
door
30” All Refrigerator
Schematic
Lights, alarms and fans
Line voltage travels through the door
light switch to all the cavity lights.
ADVANCE
30” All Refrigerator
Schematic
Lights, alarms and fans
Neutral runs from E12, through the
Light relay and exits E13.
Click mouse to advance
From E13, neutral flows into the
lights
ADVANCE
30” All Refrigerator
Schematic
Lights, alarms and fans
When the door is open and the lights
come on, line voltage is also sent to the
board to E8 (freezer) and E7 (Refrig).
ADVANCE
30” All Refrigerator
Schematic
Lights, alarms and fans
When the door is open and the lights
come on, line voltage is also sent to the
board to E8 (freezer) and E7 (Refrig).
This is the signal voltage to the HV
Board that the door is open. When the
built-in timer expires, the Door Alarm
signal will tone. Closing the door will
remove the voltage and the alarm will
reset.
ADVANCE
30” All Refrigerator
Schematic
Lights, alarms and fans
When ever the door is opened and the
unit is in Sabbath mode, the fans
continue to run. If set to standard
operation, the fans will shut off (AR
units only)
This is controlled by the use of a device
called the Sabbath mode Relay
Click the Door Fan Switch to open the
door
30” All Refrigerator
Schematic
Lights, alarms and fans
With the Door open, the door fan switch
contacts open. Voltage no longer flows
through the switch.
ADVANCE
30” All Refrigerator
Schematic
Lights, alarms and fans
With the Door open, the lower light
switch closes and provides power for
the lights and the door open alarm.
It also supplies voltage to the Sabbath
Mode relay coil.
ADVANCE
30” All Refrigerator
Schematic
Lights, alarms and fans
With a neutral return through the NC
light relay on the HV board, the relay
will engage and open the NC contact
Click mouse to advance
With the Sabbath mode relay engaged,
and the door fan switch contact open,
we have removed line voltage from the
primary of the step down transformer
inside the Temperature translator
ADVANCE
30” All Refrigerator
Schematic
Lights, alarms and fans
With power removed from the primary
of the step down transformer we no
longer have 24 VDC to the cavity fans.
The fans stop and the lights are on
ADVANCE
30” All Refrigerator
Schematic
Condition:
• Normal Operation
• Door Closed
• Lights Off
• Cooling fans running
• Compressor and
…Condenser operating
Open Door
EXIT
30” All Refrigerator
Schematic
Condition:
• Normal Operation
• Door open
• Lights On
• Cooling fans off
• Compressor and
…Condenser operating
Close Door
EXIT
30” All Refrigerator
Schematic
Condition:
• Sabbath Mode
• Door Closed
• Lights off
• Cooling fans running
• Compressor and
…Condenser operating
Open Door
EXIT
30” All Refrigerator
Schematic
Condition:
• Sabbath Mode
• Door open
• Lights off
• Cooling fans running
• Compressor and
…Condenser operating
Close Door
EXIT