11-5
CONTROL SYSTEM
SM FBFRPM 1-A.0 GB
11.3.5 Protections
a
. High pressure protection is
a
pplic
a
ble to
a
ll oper
a
ting modes.
b. Deicing control is v
a
lid in He
a
t
a
nd Auto He
a
t Modes only.
c. Defrosting control is v
a
lid in Dry, Cool,
a
nd Auto Cool Modes.
11.3.6 Thermistors
Operation
a
. Return
a
ir Temp. is detected by RAT in norm
a
l Mode, or by RCT (R/C sensor) in
I-FEEL Mode.
b. Indoor Coil Temp. is detected by ICT.
c. Outdoor Coil Temp. is detected by OCT.
d. Definition
of
thermistor
f
a
ults:
1) Thermistor is disconnected - the thermistor re
a
ding is below – 30
O
C.
2
) Thermistor is shorted - the thermistor re
a
ding is
a
bove 75
O
C.
3) Thermistor Temp re
a
ding doesn’t ch
a
nge -
a
) This test is performed only once
a
fter
a
unit is switched from OFF/
S
TB
Y
to oper
a
tion. At the first occurrence of 10 min continuous COMP
oper
a
tion, the current ICT
a
re comp
a
red with those when the COMP w
a
s
switched from OFF to ON 10 min before. If the
'
T is less th
a
n 3
O
C, the
thermistor is reg
a
rded
a
s defective.
b) The ICT no-ch
a
nge error c
a
n be dis
a
bled together by connecting
a
4.7k
:
resistor (5%) to the ICT connector. These resistors
a
re equiv
a
lent to
a
thermistor 48+/-1
O
C.
e. C
a
ses for dis
a
bling ICT thermistor disconnected detection:
1) The detection of thermistor f
a
ults
a
.
a
nd b.
a
bove is dis
a
bled when Deicer
Protection is st
a
rted. The detection will be en
a
bled
a
g
a
in only
a
fter (1) the
deicing is completed,
a
nd (
2
) COMP h
a
s been rest
a
rted
a
nd oper
a
ted for 30
sec.
2
) When
a
ll the following conditions
a
re fulfilled:
a
) 4.7k
:
resistor is connected to the OCT.
b) IFAN is OFF.
c) Compressor is ON.
d) ICT < -30 (disconnected).
Summary of Contents for YCF055
Page 45: ...8 2 WIRING DIAGRAMS SM FBFRPM 1 A 0 GB 8 3 Indoor Units YDF030 8 4 Outdoor Unit GCN 30NRCT...
Page 46: ...8 3 WIRING DIAGRAMS SM FBFRPM 1 A 0 GB 8 5 Outdoor Unit GCN 37NRC 8 6 Outdoor Unit GCN 37NRCT...
Page 47: ...8 4 WIRING DIAGRAMS SM FBFRPM 1 A 0 GB 8 7 Outdoor Unit YDF047 8 8 Outdoor Unit YCF055...
Page 50: ...10 2 REFRIGERATION DIAGRAMS SM FBFRPM 1 A 0 GB 10 1 2 FBF045 FBF060...
Page 92: ...14 4 EXPLODED VIEWS AND SPARE PARTS LISTS SM FBFRPM 1 A 0 GB 14 4 Indoor Unit FBF046 FBF060...
Page 109: ...15 3 OPTIONAL ACCESSORIES SM FBFRPM 1 A 0 GB 15 3 RCW RCW2 Wiring Connections as Shown on Kit...
