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System Mode =
OFF?
Inputs -> FIRE ->
FSD in alarm?
HVAC Mode = OFF
(Fire Shutdown)
HVAC Mode = OFF
(Disabled)
Unit not in factory
test AND fire-smoke
control mode is
alarming?
Inputs -> FIRE ->
PRES in alarm?
HVAC Mode = OFF
(Pressurization)
Inputs -> FIRE ->
EVAC in alarm?
HVAC Mode = OFF
(Evacuation)
HVAC Mode = OFF
(Purge)
Config->UNIT->
C.TYP changed
while unit running?
15-second delay
HVAC Mode = OFF
(Disabled)
System Mode =
TEST?
HVAC Mode = TEST
Service Test ->
S.STP = YES?
HVAC Mode = SoftStop
Request
Config->UNIT->
RM.CF =2 AND
Inputs->GEN.I->
REMT = ON
HVAC Mode = OFF
(Rem. Sw. Disable)
Config->SP-> SP.CF
= 1
OR
2
HVAC Mode = OFF
(Static Pres. Fail)
Config->UNIT->
SFS.M=1 OR 2 AND
Config->UNIT->
SFS.S=YES?
HVAC Mode = OFF
(Fan Status Fail)
HVAC Mode = OFF
(Starting Up)
Unit shutting down?
HVAC Mode = Shutting
Down
Unit control free to select
normal heating/cooling
HVAC mode
HVAC Mode = OFF
HVAC Mode =
Tempering Vent
HVAC Mode =
Tempering LoCool
HVAC Mode =
Tempering HiCool
HVAC Mode = Vent
HVAC Mode = Low Cool
HVAC Mode = High Cool
HVAC Mode = Low Heat
HVAC Mode = High Heat
HVAC Mode = Unocc.
Free Cool
No
No
No
No
No No
No
No
Yes
Yes
Yes
Yes
Yes
YesYesYesYes
System
Mode
Fire-
Smoke
Control
Exceptions
Unit
control free
to choose
HVAC
Mode
and static pressure
sensor has failed
and supply fan
has failed
Yes Yes Yes Yes
No
No No
No
Unit just waking up
from power reset?
HVAC Mode =
Compressor Stuck On
Fig. 4 — Mode Selection
A48-8268