Carrier WeatherExpert 48N2 Controls, Start-Up, Operation, Service, And Troubleshooting page 41

System Mode = No
OFF?
System
Yes
Mode
No
Inputs -> FIRE -> HVAC Mode = OFF
FSD in alarm? (Disabled)
Yes
HVAC Mode = OFF
(Fire Shutdown)
Exceptions
Config->UNIT->
No
C.TYP changed
while unit running?
Yes
15-second delay
HVAC Mode = OFF
(Disabled)
Config->SP-> SP.CF
= 1 OR 2
and static pressure
sensor has failed
Yes
HVAC Mode = OFF
(Static Pres. Fail)
No
RCB Comm failure?
Yes
HVAC Mode = OFF
(RCB Comm fail)
Fire-
Smoke
Control
No
System Mode = Service Test ->
TEST? S.STP = YES?
Yes
HVAC Mode = SoftStop
HVAC Mode = TEST
Config->UNIT->
Config->BP->
SFS.M=1 OR 2 AND
BP.CF=5 AND
No No
Config->UNIT->
There is a plenum
SFS.S=YES?
pressure switch
and supply fan
error
has failed
Yes
HVAC Mode = OFF HVAC Mode = OFF
(Fan Status Fail) (Plenum Pressure Trip)
No
Air Press Switch
Supply VFD fault?
Failure?
Yes Yes
HVAC Mode = OFF HVAC Mode = OFF
(Supply VFD fault) (Air Pres Sw fail)
Unit control free to select
normal heating/cooling
HVAC mode
Unit
control free
to choose
HVAC
No
Mode
Fig. 3 — Mode Selection
41
Unit not in factory
No
test AND fire-smoke
control mode is
alarming?
Yes
No
Inputs -> FIRE -> Inputs -> FIRE ->
PRES in alarm? EVAC in alarm?
Yes Yes
HVAC Mode = OFF HVAC Mode = OFF
(Pressurization) (Evacuation)
Config->UNIT->
No No
RM.CF =2 AND
Inputs->GEN.I->
REMT = ON
Yes Yes
HVAC Mode = OFF
Request (Rem. Sw. Disable)
No No
Unit just waking up
Unit shutting down?
from power reset?
Yes Yes
HVAC Mode = OFF HVAC Mode = Shutting
(Starting Up)
No No
3-phase power failure? Duct static press
failure?
Yes
HVAC Mode = OFF HVAC Mode = OFF
(3-Phase Pwr fail) (Duct Static Pres)
HVAC Mode = OFF
HVAC Mode =
Tempering Vent
HVAC Mode =
Tempering LoCool
HVAC Mode =
Tempering HiCool
HVAC Mode = Venting
Dehumidification
HVAC Mode =
Cooling Dehumidification
HVAC Mode =
Heating Dehumidification
No
HVAC Mode = OFF
(Purge)
(Config->HEAT->
HT.TY=4 OR Config->
No
DEHU->D.SEL=1) AND
(Inputs ->GEN.I->
FRZ.S=ALRM?)
Yes
HVAC Mode = Freeze
Stat Trip
Compressor
No No
contactor welded
on?
Yes Yes
HVAC Mode = Comp.
Down Stuck On
No
Yes
HVAC Mode = Vent
HVAC Mode = Low Cool
HVAC Mode = High Cool
HVAC Mode = Low Heat
HVAC Mode = High Heat
HVAC Mode = Unocc.
Free Cool