Bryant 619AHB Series Service Manual page 11

SG-619AHB-01: Service Manual
Main Protection
Fan speed is out of control
When the indoor fan speed is too low (300RPM) or too high (1500RPM)
for a certain time, the unit stops and the LED displays a failure.
Inverter module protection
The inverter module has a protection function for current, voltage and
temperature. If any of these protections engage, the corresponding code
displays on the indoor unit and the unit stops working.
Indoor fan delayed open function
When the unit starts up, the louver activates immediately and the indoor
fan opens 10s later. If the unit is running in the HEATING mode, the
indoor fan is controlled by the anti-cold wind function.
Zero crossing detection error protection
If the AC detects that the time interval is not correct for a continuous
240s, the unit stops and the LED displays the failure. The correct zero
crossing signal time interval should be between 6-13ms.
Sensor protection at open circuit and breaking disconnection
If only one temperature sensor malfunctions, the air conditioner
continues to work however the error code appears on the LED, in the
event of any emergency use. If more than one temperature sensor
malfunctions, the air conditioner stops working.
Operation Modes and Functions
FAN Mode
1. Outdoor fan and compressor stop
2. Temperature setting function is disabled and no setting temperature
appears.
3. Indoor fan can be set to high/med/low/auto
4. The louver operates the same as in the COOLING mode.
T1
°C
10.8°F (6.0°C)
a
9°F (5.0°C)
b
7.2°F (4.0°C)
c
4.5°F (2.5°C)
1.8°F (1.0°C)
Fig. 12 —AUTO FAN Mode
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
L
d
e
COOLING Mode
Indoor Fan Running Rules:
In the COOLING mode, the indoor fan runs all the time and the
speed can be selected as HIGH, MEDIUM, LOW and AUTO. When
the setting temperature is reached, if the compressor stops running, the
indoor fan motor runs at the minimum or setting speed. The indoor fan is
controlled by the rules shown in Fig. 13.
Setting fan
T1-Td (°F)
speed
H
M
L
Fig. 13 — Indoor Fan Running Rules
The AUTO fan is controlled by the rules shown in Fig. 14.
Fig. 14 — Indoor Fan Running Rules
Evaporator Temperature Protection
When the evaporator temperature is less than the setting value, the
compressor stops.
11
Actual fan speed