American Standard UV05 manual Econ State State, Cool mode super state diagram

Description of Operation

Figure 12: Cool mode super state diagram

Transition

Point

UVCMode≠Cool AND UVCMode≠Auto

OR

UVCMode=Auto AND Space=Cold AND

MechPI=SatLow(3min) AND

EconPI=SatLow

UVCMode=Cool

OR

UVCMode=Auto AND Space=Warm

	CoolMode
	SuperState		Space=HighCO2
			OR
			DAT<VCLL
Econ≠Available		Econ	Space≠HighCO2	DAHeat
	AND	3		4
MechCool≠Available			AND
			HeatPI=SatLow
		EconTimer=Expired	AND
	Econ = Available		DAT>VCLL	HeatPI=SatHi(2min)
		(3 minutes) AND
	AND	EconPI=SatHi AND		AND DAT<VCLL
MechCool≠Available		MechCool=Available		LLPI=SatLow (2min)
		MechPI=SatLow (3min) AND
				AND
		EconMechTimer=Expired
				DAT>(VCLL+1.8F)
		(3 minutes) OR
	Econ≠Available	MechCool≠Available
	AND
CantCool	MechCool=Available	EconMech		LowLimit

C1

F

Econ≠Available

Econ≠Available

AND

MechCool=AvailableEcon=Available

MechCool≠Available

Mech

2

Econ State (State 3)

The Econ state is a “normal” state during Cool mode. The Econ state typically is active in the Cool mode when primary cooling (economizer) is available and adequate to meet the cooling requirements.

When the Econ state becomes active, the UVC uses economizer cooling (see “Economizer Operation” on page 32) as needed to maintain the effective cooling set point (see “Space Temperature Set Points” on page 26). If cooling is not required while in the Econ state, the UVC can “idle” in the Econ state until cooling is required or until there is a call to switch to another mode or state.

The UVC monitors the DAT to ensure it does not fall below VCLL.

The CO2 demand controlled ventilation function (optional) will be active (see “CO2 Demand Controlled Ventilation (optional)” on page 34) and the OA damper is adjusted as needed to maintain the CO2 set point.

McQuay OM 751 19