Carrier 40MBFAQ Service Manual page 8

40MBFAQ: Service Manual
The AUTO fan is controlled by the rules shown in Fig. 11.
T1-75.2°F (24°C)
..........................................................................
12°F (6°C)
a
10°F (5°C)
b
8°F (4°C)
c
5°F (2.5°C)
2°F (1°C)
Fig. 11 — Indoor Fan Running Rules
Evaporator Temperature Protection
When the evaporator temperature is lower than the setting value, the
compressor stops.
HEATING Mode
Indoor Fan Running Rules
When the compressor is on, the indoor fan can be set to high/med/low/
auto/mute. When the indoor unit coil temperature is low, the anti-cold air
function starts and the indoor fan motor runs at a low speed and the speed
can not be changed. When the temperature is lower than the setting value,
the indoor fan motor stops.
When the indoor temp reaches the setting temperature, the compressor
stops and the indoor fan motor runs at the minimum or setting speed (the
anti-cold air function is valid). The indoor fan is controlled by the rules
shown in Fig. 12.
Setting Fan
T1-Td + 1.5 °C (3°F)
Speed
-3°F(-1.5°C)
H -5°F(-3.0°C)
-8°F(-4.5°C)
-3°F(-1.5°C)
M
-5°F(-3.0°C)
-8°F(-4.5°C)
-3°F(-1.5°C)
L
-5°F(-3.0°C)
-8°F(-4.5°C)
Fig. 12 — Indoor Fan Running Rules
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
H
(H-L)*0.75+L
........................
(H-L)*0.5+L
........................
(H-L)*0.25+L
........................
d
L
e
Actual Fan Speed
H- H-=H-G)
H =H
H+(H+=H+G)
M-(M-=M-Z)
M(M=M)
M+(M+=M+Z)
L-(L-=L-D)
L(L=L)
L+(L+=L+D)
Auto Fan Action in HEATING Mode
T1-Td+3°F(1.5°C)
0°F(0°C)
-2°F(-1°C)
-4°F(-2°C)
-6°F(-3°C)
-7°F(-4°C)
-9F(-5°C)
-11°F(-6°C)
A220984
-12°F(-6.5°C)
Fig. 13 — Auto Fan Action in HEATING Mode
DEFROST Mode
If any one of the following items is satisfied, the unit enters the
DEFROST mode. After the compressor starts and runs, mark the
minimum value of T3 from the 10th minute to the 15th minute as T30.
1. If the compressor runs for 29 minutes and T3 < TCDI1, T3 ＋
T30SUBT3ONE
2. If the compressor runs for 35 minutes and T3 < TCDI2, T3 ＋
T30SUBT3TWO ≦ T30.
3. If the compressor runs for 29 minutes. and T3 < TCDI3 for three
minutes.
4. If the compressor runs for 120 minutes and T3 < 5
Defrost End
If any one of the following items is satisfied, the DEFROST mode ends
and the machine reverts to the normal HEATING mode.
• T3 increases to a point higher than TCDE1.
• T3 maintains a point higher than TCDE2 for 80 seconds.
• Unit runs for 10 minutes in DEFROST mode.
Compressor
4-Way valve
Outdoor fan
Fig. 14 — Defrost Action
A220985
8
L
(H+-L)*0.2+L
............
(H+-L)*0.4+L
............
............ (H+-L)*0.6+L
............
............................... (H+-L)*0.8+L
H+
...............................
T30.
≦
no longer than 10min
X1 10S
X2 10S
A220986
° F (−15 ° C).
A220987