User's Manual

Environmental control system 48
• Alarms chart (on page 49)—Displays active critical and warning alarms.
Psychrometric chart
The Charts screen displays the range of the POD within psychrometric operating envelopes. The following
psychometric operating envelops are available.
Operating envelope Description
ASHRAE recommended
Displays the recommended ASHRAE operating
envelope
ASHRAE allowable
Displays the minimum operating envelope that
ASHRAE recommends
HP IT allowable
Displays the recommended HP IT operating envelope
A/B side envelope
Displays the configured operating envelopes for IT
section A and IT section B Adiabatic units
A/B side units
Plots the current combination temperature, return air
temperature, and outdoor air temperature on the
psychrometric chart
A/B side averages
Plots the IT section average combination temperature,
return air temperature, and outdoor air temperature
on the psychrometric chart
Readings chart
The readings chart at the bottom of the Charts screen displays the following information: