Specifications

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Differential Pressure Switch (DPS)
The differential pressure switch is applied to a unit for which the flow of water through the heat
exchange must be confirmed prior to the unit operating. For dedicated functionality, the
differential pressure switch hardware is connected directly to IN-5 with a contact closure
indicating a service event, and the DPS option must be configured by the equipment integrator.
The Input Expansion Module may be used if additional input options are required, and may be
configured with the following options:
• Differential Pressure Switch (without expansion module)
• Filter Switch, Fan Status Switch, Differential Pressure Switch (expansion module).
In addition, the following applies to the DPS option:
• An alarm notification is set if the DPS is asserted TRUE.
• A DPS alarm will terminate compressor operation.
• Three DPS events will hard lockout the unit.
• The DPS hard lockout condition is cleared by a reset.
• A sum of all DPS events will be logged.
• A sum of DPS events will be logged for a 1 hour period.
Secondary Condensation Drain Pan (SDP)
The secondary condensate drain pan option employs a backup drain pan located under the unit
to protect the building structure from water damage due to condensate overflow, when the
primary condensate drain becomes obstructed for some reason or the other.
The following applies to the Secondary Drain Pan option:
• When the Secondary Condensate Drain pan signal is asserted the unit will terminate
operation.
• The Secondary Condensate Drain hardware is field wired and configured as a single input
option on IN-5.
• The Secondary Condensate Pan option is enabled and configured by the equipment
integrator.
• Condensate pump failure will produce an Alarm.