MVE Biological Systems
TEC 3000 Operating and Maintenance Freezer Manual
13289499 Rev H •
43
7.1.10.
Lid Switch
The TEC 3000 has the ability to support a lid switch. This additional feature allows the user to
disable filling while the lid is open, utilize the Lid Open Alarm, or initiate an automatic fog clear.
A lid switch comes standard on all MVE Series and MVE Cabinet Series freezers. There are
two configurations of the lid switch: the standard UL lid switch configuration and the optional
fog clear lid switch configuration. The difference in their functionality is based on how they are
wired to the TEC 3000.
•
Standard UL Lid Switch configuration
–
The UL lid switch configuration, which is
standard on MVE Series and MVE Cabinet Series freezers, is wired directly in series
with the fill valves. With this configuration, when the lid is open and the lid switch is
disengaged, the fill valves cannot be energized. When the lid is down and the lid switch
is engaged, the fill valve circuit is closed and the valves can be energized. The
functionality of the UL lid switch is independent of the settings in the lid switch menu of
the TEC 3000 since it is hardwire
d into the fill valve circuit. MVE’s UL listing stipulates
that the models in these two series must have the lid switch hardwired in series with the
fill valves when it leaves the factory to be compliant. The fog clear and lid open alarm
features are not available with the UL lid switch configuration. It is available for users to
easily adapt their UL lid switch configuration to a fog clear lid switch configuration and
acquire these features. Contact your MVE Distributor or Chart MVE Technical Service
for instructions.
NOTE: The standard UL Lid Switch configuration is not controlled by the TEC 3000 Lid
Switch Menus and the Lid Switch Installed option should be set to “NO”.
•
Optional Fog Clear Lid Switch configuration
–
The optional fog clear lid switch
configuration is connected directly to the TEC 3000 wire harness lid switch connector
and is not wired in series with the fill valves. This lid switch configuration is controlled
by the settings in the lid switch menu of the TEC 3000, which include the fog clear
feature and the Lid Open Alarm. With the fog clear feature enabled, the freezer will fill
for 30 seconds each time the lid is opened, which clears the fog and improves visibility.
The Lid Open Alarm feature allows the user to set a maximum time that the lid can
remain open before an alarm is triggered. For instructions on adjusting the lid switch
settings, refer to the Optional Features section.
NOTE: Converting from the standard UL Lid Switch configuration to the optional Fog
Clear Lid Switch configuration voids the UL compliance and requires that the
UL mark be removed from the freezer.
NOTE: Both lid switch configurations do have an override feature. Simply pull up on
the lid switch until it clicks to engage the manual override.
Содержание MVE 1842P-150
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