Carrier 40MBFAQ Service Manual

40MBFAQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
8
The AUTO fan is controlled by the rules shown in Fig. 11.
A220984
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.
A220985
Fig. 12 — Indoor Fan Running Rules
Auto Fan Action in HEATING Mode
A220986
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
≦ T30.
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°F (−15°C).
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.
A220987
Fig. 14 — Defrost Action
..........................................................................
a
12°F (6°C)
T
1-75.2°F (24°C)
........................
10°F (5°C)
b
........................
........................
c
8°F (4°C)
5°F (2.5°C)
d
2°F (1°C)
e
H
(H-L)*0.75+L
(H-L)*0.5+L
(H-L)*0.25+L
L
Setting Fan
Speed
Actual Fan Speed
H=H
H+(H+=H+G)
M(M=M)
L(L=L)
L+(L+=L+D)
H- H-=H-G)
M+(M+=M+Z)
L-(L-=L-D)
M-(M-=M-Z)
L
H
T1-Td + 1.5 °C (3°F)
M
-3°F(-1.5°C)
-5°F(-3.0°C)
-8°F(-4.5°C)
-3°F(-1.5°C)
-5°F(-3.0°C)
-8°F(-4.5°C)
-3°F(-1.5°C)
-5°F(-3.0°C)
-8°F(-4.5°C)
............
............
T1-Td+3°F(1.5°C)
............
............
...............................
L
(H+-L)*0.2+L
(H+-L)*0.4+L
(H+-L)*0.6+L
(H+-L)*0.8+L
H+
...............................
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)
-12°F(-6.5°C)
Compressor
Outdoor fan
4-Way valve
X1
10S
10S
no longer than 10min
X2

Carrier 40MBFAQ Specifications

General

Brand	Carrier
Model	40MBFAQ
Category	Heater
Language	English