Carrier WeatherExpert 48N2 - Page 43

43
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->HEAT->
HT.TY=4 OR Config->
DEHU->D.SEL=1) AND
(Inputs ->GEN.I->
FRZ.S=ALRM?)
HVAC Mode = Freeze
Stat Trip
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)
Unit just waking up
from power reset?
HVAC Mode = OFF
(Starting Up)
Unit shutting down?
HVAC Mode = Shutting
Down
Compressor
contactor welded
on?
HVAC Mode = Comp.
Stuck On
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 = Re-Heat
HVAC Mode =
Dehumidification
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 No
No
No
Yes
Yes
Yes
Yes
Yes
YesYesYesYesYes
System
Mode
Fire-
Smoke
Control
Exceptions
Unit
control free
to choose
HVAC
Mode
and static pressure
sensor has failed
and supply fan
has failed
Config->BP->
BP.CF=5
AND
HVAC Mode = OFF
(Plenum Pressure Trip)
There is a plenum
pressure switch
error
Yes Yes Yes Yes Yes Yes
No
No No No No
Fig. 7 — Mode Selection