Main Menu AG-View Run Hours Log, Read Digital Inputs

Advanced Microprocessor with Graphics Control Setup

4.11.3Read Digital Inputs

The four custom alarm inputs can be defined to be digital inputs. Digital inputs are used to sense cus- tomer devices for status display purposes only and will not activate the audible alarm.

4.11.4Set Up Digital Inputs

A digital input is enabled by defining one of the four custom alarms to be STATUS ONLY type in the alarm setup screen. The digital input is given a name by specifying it to be one of the optional alarms or a custom text alarm. See 4.4.3 - Setup Alarms and 4.4.4 - Set Up Custom Alarms.

4.12Main Menu (AG)—View Run Hours Log

Selecting VIEW RUN HOURS LOG will step to the following menu:

•VIEW 24 HOUR RUN TIME HISTORY

•VIEW TOTAL RUN HOURS

4.12.1View 24 Hour Run Time History

The history of each load for every hour during the past 24 hours is displayed in the run hour history. The percentage of each hour that the load was on is displayed from 0 to 100% in increments of 5% or 3 minutes. Loads with a variable output are displayed as a percentage of their capacity for an hour. For example, a variable load that is 50% on for 1/2 of the hour will be displayed as 25% on for that hour.

4.12.2View Total Run Hours

The total operating hours of all major components in the unit can be monitored from the display and are retained in nonvolatile memory. Run times are available for the following:

•COMPRESSOR 1

•COMPRESSOR 2

•GLYCOOL COIL (or DUAL COOL COIL)

•FAN

•HUMIDIFIER

•REHEAT 1 (or HOT WATER REHEAT)

•REHEAT 2

•REHEAT 3

•CHILLED WATER COIL

•HEAT REJECTION

The component run hours for each individual component can be reset by selecting the run hours dis- play screen for the desired component, then pressing ENTER within five (5) minutes of applying power to the control. The user will then be prompted to press ENTER to clear the selected compo- nent's run hours.

NOTE

A component’s run hours should BE RESET ONLY when the component has been replaced.

4.13Load Control Features

4.13.1Short Cycle Control

The control system monitors both compressors and prevents each from turning on within 3 minutes of being turned off. If this (on, off, on) occurs too often, ten (10) times in one hour, a Short Cycle alarm could occur.

4.13.2Sequential Load Activation Control

The control allows only one load output to be energized at a time on a restoration of power or micro- controller reset. Each additional load output will be activated at one second intervals until desired operating conditions have been met.

VE, DH, VH, DE specifications

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