Carrier SUPRA 950Mt - Page 35

2-23
AL16: Compart
ment 3
Retur
n
Air Sensor Alarm
The Compartment 3 return air sensor alarm is dis-
pl
ay
ed
wi
th
th
e
de
sc
ri
pti
on
3R
A
SEN
SOR
or
AL
16
.
Thi
s
alarm is generated if the return air sensor is open or
shorted. The fault light (FL) is turned on because there
is no controlling probe.
AL17: Display Alarm
When no communications exist between the main
board and the di
splay board for eight
seconds, the dis-
play alar
m
descri
ption is DISPLA
Y or AL17
AL18: Maintenance Hour Meter 1 Alarm
The Maintenance Hour Meter Alarm 1 is displayed
with the description SERVICE 1 or AL18. This alarm is
generated when the designated hour meter is greater
than maintenan
ce hour
meter 1.
AL19: Maintenance Hour Meter 2 Alarm
The Maintenance Hour Meter Alarm 2 is displayed
with the description SERVICE 2 or AL19. This alarm is
generated when the designated hour meter is greater
than maintenan
ce hour
meter 2.
AL20: Compartment 1 Out-of-Range Alarm
The
out
-of-r
ang
e
ala
rm
is
dis
pla
yed
with
the
des
crip
-
tion 1RA OUT or AL20. This alarm is generated when
com
par
tme
nt
1
is
out-
of-ra
nge (refer
to
FN8
sec
tion
2.8.6). The fault light (FL) is turned on.
AL21: Compartment 2 Out-of-range Alarm
The
out
-of-r
ang
e
ala
rm
is
dis
pla
yed
with
the
des
crip
-
tion 2RA OUT or
AL21. This ala
rm is gene
rated wh
en
Compartment 2 is out-of-range (refer to FN8 section
2.8.6). The fault light (FL) is turned on.
AL22: Compartment 3 Out-of-range Alarm
The
out
-of-r
ang
e
ala
rm
is
dis
pla
yed
with
the
des
crip
-
tion 3RA OUT or AL22. This alarm is generated when
Compartment 3 is out-of-range (refer to FN8 section
2.8.6). The fault light (FL) is turned on.
AL23: No Power for Standby Alarm
“NO POWER” will be displayed if truck unit is swit-
ched to standby and power plug is not plugged in.
AL26:
Suction Pre
ssure Al
arm
The system check alarm will be displayed with the
descri
ption SYS
TEM CK or AL26
. The fault
light (FL
)
is
turned on. If the unit is in cool mode and the supply air
temp
era
ture
bec
ome
s
5
_
F (
3
_
C)
hi
gh
er
tha
n
the
re
tur
n
air temperature for continuous minutes then the alarm
wil
l be
acti
vate
d. If
the sucti
on
pre
ssu
re beco
mes
gre
a-
ter than 6.9 bars (100 PSI) in heat mode for 60 conti-
nuo
us
sec
ond
s
for
bot
h
per
ish
abl
e
and
froz
en
setp
oin
ts
the
al
ar
m
wi
ll
be
ac
tiv
ate
d.
If
th
e
su
cti
on
pr
es
su
re
be
co
-
mes less t
han -
-0.3
bars (-
-5
PSI)
for 120 continuous
seconds while any compartment is in cool mode and
wh
il
e
th
e
ret
ur
n
ai
r
tem
pe
ra
tur
e
for
the
co
ol
in
g
co
mp
art
-
ment is > --17.8
_
C (0
_
F) and the ambient temperature
is
gr
ea
te
r
or
eq
ua
l
to
4.
4
_
C(40
_
F)
th
e
al
ar
m
wi
ll
beact
i-
vated.
2.
8.
9
He
at
/C
oo
l
mo
de
The
sys
tem
is
con
figu
red
for
coo
lin
g
mod
e
for
eng
ine
or
sta
nd
by
sta
rt
(de
fa
ul
t
mo
de
).
Onc
e
un
it
is
co
ns
id
er
ed
runnin
g
it
will maintain setpoint tempera
ture by
switch-
ing between heat and cool.
2.
8.
10
De
fr
ost
cy
cl
e
Defrost is an independent cycle (overriding cooling
and heating functions) to de-ice the evaporator as re-
qui
red
.
The
con
trol
ler
dis
pla
ys
“DF”
dur
ing
def
rost
mod
e
on
therigh
t
ha
nd
tem
pe
ra
tur
e
di
sp
la
y
.
Theleft
ha
nd
di
s-
play will continue to display the setpoint.
There is 2 ways of initiating a defrost.
Method one to initiate defrost is by pressing the
Manual defrost key
Me
tho
d
two
is
tha
t
de
fro
st
ma
y
be
in
iti
ate
d
au
tom
ati
-
ca
ll
y
at
pr
es
et
in
ter
va
ls
by
de
fro
st
tim
er
in
themicr
op
ro-
cessor.
1.
Automa
tic defr
ost initia
tion
A defrost will be initiated if t
he defrost time (entered
via the keypad) is elapsed.
Th
e
de
fro
st
tim
er
is
re
se
t
to
ze
ro
wh
en
ev
er
a
de
fro
st
cyc
le
is
in
iti
ate
d.
Thecont
rol
le
r
ho
ld
s
in
me
mo
ry
the
la
st
entered defrost interval.
The defrost timer runs only when the defrost ther-
mostat is closed (DTS)
2.
Defr
ost f
unction
After
initia
tion,
defrost
mode
termina
tes
when
the
defrost termination thermostat (DTS) opens indicating
that
the evaporator is
de-
-iced.e
defrost cycle is
com-
ple
te. The
def
rost timer runs only when the
DTS is
closed. The timer does not accumulate time during de-
frost mode, during standby off cycles or auto-start off
cycles.
The
com
pre
sso
r
ope
rate
s
at
max
imu
m
cap
aci
ty
(engine forced in high speed) during defrost.
3.
Fail safe def
rost ter
minati
on
Sh
ou
ld
the
de
fro
st
cy
cl
e
no
t
co
mp
le
te
wi
thi
n
45
mi
n-
ute
s
or
if
the
ex
te
rna
l
de
fro
st
si
gn
al
do
es
no
t
cl
ea
r
at
de
-
frost termination, the defrost cycle is terminated. The
interna
l timer is
reset for 1.5
hours and the
externa
l de-
frost signal is ignored for defrost initiation. The manual