Optional Refrigeration System
This section applies only to units supplied with this
option. The refrigeration system on the A and E series
shakers are identical in operation. Please refer to page
31 for refrigeration replacement parts.
When the unit power is on, refrigeration can be initiated
by turning ON the refrigeration switch which is located to
the left of the defrost timer on the lower right side panel
of the shaker cabinet. This should be initiated (turned
on) only when a temperature set point of approximately
32°C or less is required (based on your ambient tempera-
tures). Both the main power switch and the refrigeration
switch need to be ON for the refrigeration system to
work. When the refrigeration switch is activated, the
compressor system will run continuously and the system
will go through the following routine:
Upon every activation of the refrigeration switch to the
ON position, there is an approximate 2-minute delay until
the compressor becomes activated. This is a safety fea-
ture, to prevent damage to the compressor in the case of
quickly switching the refrigeration switch off and on
again. Because the compressor does not turn on imme-
diately after switching the refrigeration switch to on,
please note, THIS IS NORMAL. The defrost timer will
begin initiation. This may turn the fans off for several
minutes until it completes a normal defrost cycle.
During operation, the defrost timer will automatically
“engage” every 4 hours, switching cold gas through the
evaporator (inside) coils to hot gas in order to defrost the
coils. There is a dedicated sensor inside the coils which
will terminate the defrost when the temperature reaches
a point where it is assured that there is no ice or frost on
the coil. At low set point temperatures (i.e. 5°C), this
defrost time will be longer than higher set point tempera-
tures (i.e. 25°C), which may initiate and terminate imme-
diately because the coils will be much warmer at higher
set point temperatures.
27
O
PERATION
Summary of Contents for MaxQ 4000
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