Carrier 48/50AJ specifications Hvac

System Mode =	No			Unit not in factory	No
				test AND fire-smoke
OFF?
				control mode is
			Fire-
		System		alarming?
Yes			Smoke	Yes
		Mode
			Control
Inputs -> FIRE ->	No	HVAC Mode = OFF		Inputs -> FIRE ->	No	Inputs -> FIRE ->	No
FSD in alarm?		(Disabled)		PRES in alarm?		EVAC in alarm?
Yes				Yes		Yes
HVAC Mode = OFF				HVAC Mode = OFF		HVAC Mode = OFF	HVAC Mode = OFF
(Fire Shutdown)				(Pressurization)		(Evacuation)	(Purge)

Exceptions

Config->UNIT->			System Mode =		No	Service Test ->		Config->UNIT->
	No							RM.CF =2 AND	No
C.TYP changed
			TEST?			S.STP = YES?		Inputs->GEN.I->
while unit running?
								REMT = ON
Yes			Yes			Yes		Yes
15-second delay			HVAC Mode = TEST			HVAC Mode = SoftStop		HVAC Mode = OFF
						Request		(Rem. Sw. Disable)
HVAC Mode = OFF
(Disabled)
			Config->UNIT->
Config->SP-> SP.CF		No	SFS.M=1 OR 2 AND	No		Unit just waking up	No	No
			Config->UNIT->
	= 1 OR 2		SFS.S=YES?			from power reset?		Unit shutting down?
and static pressure			and supply fan
sensor has failed			has failed

Yes	Yes	Yes	Yes
HVAC Mode = OFF	HVAC Mode = OFF	HVAC Mode = OFF	HVAC Mode = Shutting
(Static Pres. Fail)	(Fan Status Fail)	(Starting Up)	Down

Unit control free to select normal heating/cooling HVAC mode

Unit

control free

to choose

HVAC

Mode

HVAC Mode = OFF

HVAC Mode = Vent

HVAC Mode =

Tempering Vent

HVAC Mode = Low Cool

HVAC Mode =

Tempering LoCool

HVAC Mode = High Cool

HVAC Mode =

Tempering HiCool

HVAC Mode = Low Heat

HVAC Mode =

Compressor Stuck On

HVAC Mode = High Heat

HVAC Mode = Unocc.

Free Cool

Fig. 4 — Mode Selection

A48-8268

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