Carrier 48AJ Operating And Service Manual page 34

System Mode = No
OFF?
System
Yes
Mode
Inputs -> FIRE -> No HVAC Mode = OFF
FSD in alarm?
Yes
HVAC Mode = OFF
(Fire Shutdown)
Exceptions
Config->UNIT->
C.TYP changed
while unit running?
Yes
15-second delay
HVAC Mode = OFF
(Disabled)
Config->SP-> SP.CF
and static pressure
sensor has failed
HVAC Mode = OFF
(Static Pres. Fail)
Unit control free to select
normal heating/cooling
HVAC mode
Unit
control free
to choose
HVAC
Mode
(Disabled)
System Mode =
No
TEST?
Yes
HVAC Mode = TEST
Config->UNIT->
SFS.M=1 OR 2 AND
No
Config->UNIT->
= 1 OR 2
SFS.S=YES?
and supply fan
has failed
Yes Yes
HVAC Mode = OFF
(Fan Status Fail)
HVAC Mode = OFF
Compressor Stuck On
Fig. 4 — Mode Selection
Unit not in factory
test AND fire-smoke
control mode is
Fire- alarming?
Smoke
Yes
Control
Inputs -> FIRE ->
PRES in alarm?
Yes
HVAC Mode = OFF
(Pressurization)
No
Service Test ->
S.STP = YES?
Yes
HVAC Mode = SoftStop
Request
No No
Unit just waking up
from power reset?
Yes
HVAC Mode = OFF HVAC Mode = Shutting
(Starting Up)
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 =
HVAC Mode = High Heat
HVAC Mode = Unocc.
34
No
No No
Inputs -> FIRE ->
EVAC in alarm?
Yes
HVAC Mode = OFF
(Evacuation)
Config->UNIT->
No
RM.CF =2 AND
Inputs->GEN.I->
REMT = ON
Yes
HVAC Mode = OFF
(Rem. Sw. Disable)
No
Unit shutting down?
Yes
Down
Free Cool
HVAC Mode = OFF
(Purge)
A48-8268