NuAire LabGard NU-560-400, Operation & Maintenance Manual

Page: 76 / 103

OM0295
Rev 2 September 2020 Page 76 of 103
Exhaust Damper Position
This parameter allows for the selection to disable the exhaust control/alarm and select a desired damper position
when the blower is turned off. Normally when the blower is turned off the exhaust control and alarm function
remains active in the B1/B2 configuration. However, if the cabinet is tied into the exhaust blower circuit it is
desirable to turn off the exhaust control and alarm function when the blower switch is turned off. This will avoid
having a constant exhaust alarm when the exhaust system is turned off. Valid settings for the exhaust control
damper position are open, close, freeze, or off. Off keeps the exhaust control/alarms active when the blower is
off.
Exhaust Override
(CAUTION: THIS PARAMETER SHOULD ALWAYS BE TURNED OFF FOR SAFE FUNTION OF A TYPE B2 CABINET.)
This parameter allows for the selection to override the controller blower interlock for testing purposes.
When exhaust override is off, sufficient exhaust airflow is required for the internal blower to function.
When on the internal blower will function without sufficient exhaust.
Note : The redundant pressure switch must also be bypassed for the internal blower to run
without exhaust.
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