TESTING
PAGE 28
ENGLISH
OUTDOOR UNIT TESTING PROCEDURES
Temperature sensor testing
The temperature sensors are negative coefficient type. These
sensors will reduce their electrical resistance as temperature
decreases. Should the sensors fail, the ECU will generate an
appropriate Error Code.
To check the calibration of the sensors:
1.
Shut off power to the outdoor unit.
2.
Disconnect the sensor at the circuit board plug.
3.
Measure the temperature of the air surrounding the
sensor.
4.
Measure the electrical resistance of the sensor. Do
not force leads into sensor plug.
5.
Compare the measured resistance of the sensor
against the specification resistance/temperature
limit listed in the reference table in this manual.
6.
If the sensor resistance is outside of the specification
tolerances shown on the resistance/temperature
table, replace the sensor.
Restricted/Sticking Outdoor Unit Check Valve Test
The Check Valve allows refrigerant to flow freely around the
outdoor unit heat mode EEV during cooling mode. The valve is
a one directional device. The check valve has an internal steel
ball that will allow refrigerant to bypass or it will backseat and
block refrigerant flow.
In heating mode this valve will backseat to force liquid
refrigerant to flow into and through the Heat Mode EEV.
If the check valve sticks, the refrigeration cycle will experience
malfunction. Depending upon the mode of operation, a
sticking check valve may bypass the outdoor EEV and flood
the outdoor coil, or it may force liquid refrigerant through the
outdoor EEV during heating mode and cause a restriction.
How to test a check valve
1.
With the system running in cooling mode, the
valve should flow refrigerant freely past the EEV. Take
the temperature of the liquid entering and leaving
the check valve. If there is a large temperature drop,
the check valve is partially restricted. If the
temperature of the liquid refrigerant into and out of
the check valve are the same, the valve is freely
flowing liquid. If the valve is restricted, replace it.
2.
In heating mode, the valve should block refrigerant
flow and force the liquid into the outdoor unit
Heating Mode EEV. Check the temperature of the
liquid entering and leaving the check valve. If the
valve is working properly, there should be warm liquid
at the entrance to the valve and cold refrigerant at
the exit. If there is no temperature difference, the
valve is allowing liquid to bypass the EEV. Replace the
check valve.
Summary of Contents for AW07LC2VHA
Page 3: ...PAGE 3 ENGLISH INTRODUCTION SPECIFICATIONS Multi Zone Indoor...
Page 4: ...PAGE 4 ENGLISH INTRODUCTION SPECIFICATIONS Multi Zone Indoor...
Page 5: ...PAGE 5 ENGLISH INTRODUCTION SPECIFICATIONS Multi Zone Outdoor...
Page 73: ...REFERENCES PAGE 73 ENGLISH Component Ratings REFERENCES...
Page 76: ...REFERENCES PAGE 76 ENGLISH Wiring REFERENCES...
Page 77: ...REFERENCES PAGE 77 ENGLISH Wiring REFERENCES...
Page 78: ...REFERENCES PAGE 78 ENGLISH Wiring REFERENCES...
Page 79: ...REFERENCES PAGE 79 ENGLISH Wiring REFERENCES...
Page 80: ...REFERENCES PAGE 80 ENGLISH Wiring REFERENCES...
Page 81: ...REFERENCES PAGE 81 ENGLISH 2U Wiring REFERENCES...
Page 82: ...REFERENCES PAGE 82 ENGLISH CN20 Connector for room card Wiring REFERENCES...
Page 83: ...REFERENCES PAGE 83 ENGLISH SWI Wiring REFERENCES...
Page 84: ...REFERENCES PAGE 84 ENGLISH Wiring REFERENCES...
Page 86: ...REFERENCES PAGE 86 ENGLISH CIRCUIT DIAGRAMS REFERENCES...
Page 87: ...REFERENCES PAGE 87 ENGLISH CIRCUIT DIAGRAMS REFERENCES...
Page 88: ...REFERENCES PAGE 88 ENGLISH WIRING DIAGRAMS REFERENCES...
Page 89: ...REFERENCES PAGE 89 ENGLISH WIRING DIAGRAMS REFERENCES...
Page 90: ...REFERENCES PAGE 90 ENGLISH 2U Piping Installation Dimensions REFERENCES...
Page 92: ...REFERENCES PAGE 92 ENGLISH Refrigerant Diagram REFERENCES...
Page 93: ...REFERENCES PAGE 93 ENGLISH Refrigerant Diagram REFERENCES...
Page 94: ...REFERENCES PAGE 94 ENGLISH 3U Piping Installation Dimensions REFERENCES...
Page 95: ...REFERENCES PAGE 95 ENGLISH 4U Piping Installation Dimensions REFERENCES...
Page 110: ...REFERENCES PAGE 110 ENGLISH SENSORS Value of Thermistor Indoor Unit...
Page 111: ...REFERENCES PAGE 111 ENGLISH SENSORS...
Page 112: ...REFERENCES PAGE 112 ENGLISH SENSORS...
Page 113: ...REFERENCES PAGE 113 ENGLISH SENSORS...
Page 114: ...REFERENCES PAGE 114 ENGLISH SENSORS...
Page 115: ...REFERENCES PAGE 115 ENGLISH SENSORS...
Page 116: ...REFERENCES PAGE 116 ENGLISH SENSORS...
Page 117: ...REFERENCES PAGE 117 ENGLISH SENSORS...
Page 118: ...REFERENCES PAGE 118 ENGLISH SENSORS...
Page 119: ...REFERENCES PAGE 119 ENGLISH SENSORS...
Page 120: ...REFERENCES PAGE 120 ENGLISH SENSORS...