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Y1 demand:
1st-Compressor is off, supply fan is on low speed, economizer modulates (minimum to maximum
open position) to maintain 55°F supply air temperature (default unit controller setting)
2nd-After 5 minutes (default unit controller setting), supply fan switches to high speed. Economizer
continues modulating with supply fan on high speed to maintain 55°F supply air temperature
Y2 demand:
1st-Compressor is off, supply fan is on high speed, and economizer modulates to maintain 55°F
supply air temperature
2nd-Economizer opens to maximum. If economizer stays at maximum open for 3 minutes (default
unit controller setting) compressor is energized and operates at first stage while supply fan stays on
high speed.
1
Outdoor air suitability is determined by the energy state of outdoor ambient (enthalpy or sensible) and its ability
to achieve the desired free cooling effects. Outdoor air suitability can also be determined by a third party
controller and provided to the RTU via a network connection.
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