Bartscher B20, Instruction Manual

Page: 22 / 57

Page 8
I. SAFETY HI TEMPERATURE THERMOSTAT
Located in the control box it is a manual reset
switch that trips OFF the operation of the machine
when its bulb (located on the liquid line just
before the drier) reaches the temperature of
70
°
C (158
°
F).
J. CLEANING SWITCH
(only
B 20 -B 40 -B 45
Located on the bottom left side of the
control box is used to energize the water inlet and
the hot gas valves so to charge the water into the
sump tank of the machine.
K. HI PRESSURE CONTROL (Water cooled
version)
Used only on
B 20 -B 40 and B 45
water cooled
versions it operates to keep between two
preset values the hi-side or discharge pressure
of the refrigerant system by energizing the coil
of the water inlet solenoid valve that control
the cooling water flow to the condenser.
L. ELECTRONIC TIMER
(
B 75 - B 90
)
Equipped with a Two Keys Dip Switch and one
Potentiometer, it manage the length of second
fase of the freezing cycle and the entire defrost/
harvest cycle with a factory pre-set times .
The first key (1) replaces the “Compressor Switch”
used on the previous electro-mechanical version;
factory setting is ON position to energize the
compressor during the standard operation of the
ice machine.
The same key (1) is switched to OFF position
when the cleaning cycle is required keeping the
water pump only in operation.
The second key (2) allows the setting of the timed
portion (Ta) of the freezing cycle according to the
model of the ice machine.
Dip Switch factory setting combinations
N. 1 N. 2
ON OFF
B 75 B 90
Resuming Chart with Keys 1 & 2 functions
N. 1 N. 2
ON Standard Setting
Compressor ON
OFF Cleaning Mode
Compressor OFF
The potentiometer is used to adjust the defrost
time and it is set directly from the factory according
to the model of the ice machine.
It can be adjustable from a minimum defrost time
of 60" (turn clockwise), to a maximum of 180"
(turn counterclockwise).
M. MASTER SWITCH
(only
B75 - B 90
)
Fitted in the control box the master switch has to
be used to start-up and to stop the ice maker
operation.
N. COMPRESSOR SWITCH
(only
B 75 - B 90
)
Located in the control box is used to de-energized
the compressor during the cleaning.
O. FAN PRESSURE CONTROL
(only
B 75 - B 90
)
Used on air cooled ice makers to maintain the
head pressure within the preset values.
P. WATER REGULATING VALVE
(only
B 75 - B 90
Water cooled version
only)
This valve controls the head pressure in the
refrigerant system by regulating the flow of water
going to the condenser.
As pressure increases, the water regulating val-
ve opens to increase the flow of cooling water.
Ta = 12'
Standard Setting
Ta = 8'