Emerson Liebert Challenger 3000, User Manual

Page: 42 / 100

Operation
36
3.8.1 High- and Low-Temperature and Humidity Events
High- and low-temperature and humidity alarms can be set for both the internal and optional exter-
nal sensors. If a sensor reading exceeds a preset threshold, a warning will appear. These warnings are
ignored after unit startup for a minimum of 1 minute. To increase the delay to warn, see 3.8 - Event
Types and Properties . The threshold settings are located in both the User and Service menus
under Set Alarms.
To apply threshold limits on the internal cooling unit sensors, the Return Sensor Alarms must be
enabled. The high and low temperature and humidity internal sensor thresholds can then be set. To
apply threshold limits on the optional external sensors, the Sensor A alarms must be enabled. The
high and low temperature and humidity external sensor thresholds can then be set. If no external
sensors are connected to the unit, it is recommended that the Sensor A Alarms be disabled.
3.8.2 User Inputs
The user can connect and specify up to four inputs depending on unit configuration. The user inputs
are digital inputs that can provide information about an event associated with the unit or space. The
customer input configuration settings are in the Service menu under Set Alarms, Screen 2 of 7. The
choices for the customer inputs are shown in Table 8 along with their associated reaction. A terminal
strip is provided in the cooling unit to connect your contact closure to. You have the ability to set the
control to react on an open or closed contact.
NOTE
The event messages will automatically reset if the temperature/humidity stays 1.8°F
(1°C)/ 2% RH below or above the threshold for one minute.
NOTE
To enabled/disabled, delay activation and set event type (alarm, warn, message) see Event
Types on page 34 .
Table 8 Customer inputs
Setting Reaction
Smoke Event Only
Water Alarm Event Only
C PMP Alarm Event Only
Flow Alarm Event Only
Stdby G Pmp Event Only
Stdby Unit Event Only
C-Input 1 Event Only
C-Input 2 Event Only
C-Input 3 Event Only
C-Input 4 Event Only
Rht Lockout Event + Electrical Heaters Disabled
Hum Lockout Event + Humidifier Disabled
Rht+Hum Lock Event + Electrical Heaters and Humidifier Disabled
Comp Lockout Event + Compressor(s) Disabled w/o Pump Down
Call Service Event Only
High Temp Event Only
Air Loss Event Only
FC Lockout Event + Free Cooling Disabled
Heater Alarm Event + Heaters Off (PeX Only)
Flow AL SD Event + Shut Down the Unit
Flow AL LC Event + Lockout Compressors, No Pump Down (enabled only if at
least one compressor is on; auto-reset depends on input status)
Comp Lock PD Event + Compressor(s) Disabled w/ Pump Down
Enable FC Forces Free Cooling to On
HTRJ VFD Activates the HEAT REJ VFD ALARM; no other function
HTRJ TVSS Activates the HEAT REJ TVSS ALARM; no other function