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SingleSystemWithMultiple
Evaporators
• Check all wiring connections to be sure
they are correct and tight.
• On the condensing unit
- Check the setting of time delay
relay. It should be set at 1 minute
(the second marker).
- Check the low pressure switch
setting on freezer units. It must be
set to 0 psig cut-out, 10 psig cut-in
to allow positive start and operation,
especially in cold ambient. This
can be changed to a higher value
in warmer climates. On cooler units,
the low pressure switch has a xed
setting and cannot be adjusted.
• Turn power on.
• On the MASTER evaporator
- DO NOT REMOVE the room sensor
from any evaporator
- Use the “PROGRAMREVIEW” button
to scroll through settings.
M = Master Evaporator S = Slave Evaporator CU = Condensing Unit
CU
M
S
S
S
Start-UpOperation
- Check “rEF” (Refrigerant Type).
Factory defaults are: air defrost
R-22, electric defrost R-404A.
Change to the refrigerant being used.
- Check “bot” (Box Temperature).
Factory defaults are: air defrost
35°F and electric defrost –10°F.
Change to the desired temperature.
- Review and change other setting if
necessary.
- See procedures below on how to
change settings.
• On the SLAVE evaporators. All Beacon II
boards are shipped with the factory
default as a “MASTER” evaporator.
- DO NOT REMOVE the Room Sensor
from any evaporator
- Each SLAVE Evaporator must be
changed to identify it as a SLAVE.
Use the “PROGRAMREVIEW” button
to scroll until “SLA” appears, then
use the “SELECT” knob to select
“YES” then press “ENTER.”