Bard QTEC SERIES PACKAGED HEAT PUMP QH362 - Manual (Page 29)

Manual 2100-420H
Page 29 of 34
CHECKING TEMPERATURE SENSOR
1. Disconnect temperature sensor from board and from
outdoor coil.
2. Use an ohmmeter and measure the resistance of the
sensor. Also use ohmmeter to check for short or
open.
3. Check resistance reading to chart of resistance use
sensor ambient temperature. (Tolerance of part is ±
10%.)
4. If sensor resistance reads very low, then sensor is
shorted and will not allow proper operation of the
heat pump control.
5. If sensor is out of tolerance, shorted, open, or reads
very low ohms then it should be replaced.
SOLID STATE HEAT PUMP CONTROL
TROUBLESHOOTING PROCEDURE
1. NOTE: A thorough understanding of the defrost
cycle sequence is essential. Review that section
earlier in this manual prior to troubleshooting the
control. Turn on AC power supply to unit.
2. Turn thermostat blower switch to “fan on” – the
indoor blower should start. (If it doesn’t,
troubleshoot indoor unit and correct problem.)
3. Turn thermostat blower to “auto” position. Indoor
blower should stop. NOTE: Many models have a
1-minute blower time delay on “off” command;
wait for this to time-out.
4. Set system switch to “heat” or “cool”. Adjust
thermostat to call for heat or cool. The indoor
blower, compressor and outdoor fan should start.
NOTE: If there was no power to 24 volt transformer,
the compressor and outdoor fan motor will not start for
5 minutes. This is because of the compressor short
cycle protection.
TABLE 6
TEMPERATURE (F) VS RESISTANCE (R) OF TEMPERATURE SENSOR
F R F R F R F R
0 . 5 2 -
0 . 4 2 -
0 . 3 2 -
0 . 2 2 -
0 . 1 2 -
0 . 0 2 -
0 . 9 1 -
0 . 8 1 -
0 . 7 1 -
0 . 6 1 -
0 . 5 1 -
0 . 4 1 -
0 . 3 1 -
0 . 2 1 -
0 . 1 1 -
0 . 0 1 -
0 . 9 -
0 . 8 -
0 . 7 -
0 . 6 -
0 . 5 -
0 . 4 -
0 . 3 -
0 . 2 -
0 . 1 -
0 . 0
0 . 1
0 . 2
0 . 3
0 . 4
0 . 5
0 . 6
0 . 7
0 . 8
0 . 9
0 . 0 1
0 . 1 1
0 . 2 1
1 7 8 6 9 1
9 9 0 0 9 1
5 8 5 3 8 1
8 1 3 7 7 1
9 8 2 1 7 1
7 8 4 5 6 1
4 0 9 9 5 1
9 2 5 4 5 1
5 5 3 9 4 1
4 7 3 4 4 1
6 7 5 9 3 1
6 5 9 4 3 1
6 0 5 0 3 1
9 1 2 6 2 1
9 8 0 2 2 1
8 0 1 8 1 1
2 7 2 4 1 1
5 7 5 0 1 1
0 1 0 7 0 1
4 7 5 3 0 1
0 6 2 0 0 1
4 6 0 7 9
1 8 9 3 9
8 0 0 1 9
9 3 1 8 8
1 7 3 5 8
9 9 6 2 8
1 2 1 0 8
2 3 6 7 7
0 3 2 5 7
0 1 9 2 7
0 7 6 0 7
7 0 5 8 6
8 1 4 6 6
9 9 3 4 6
9 4 4 2 6
5 6 5 0 6
5 4 7 8 5
0 . 3 1
0 . 4 1
0 . 5 1
0 . 6 1
0 . 7 1
0 . 8 1
0 . 9 1
0 . 0 2
0 . 1 2
0 . 2 2
0 . 3 2
0 . 4 2
0 . 5 2
0 . 6 2
0 . 7 2
0 . 8 2
0 . 9 2
0 . 0 3
0 . 1 3
0 . 2 3
0 . 3 3
0 . 4 3
0 . 5 3
0 . 6 3
0 . 7 3
0 . 8 3
0 . 9 3
0 . 0 4
0 . 1 4
0 . 2 4
0 . 3 4
0 . 4 4
0 . 5 4
0 . 6 4
0 . 7 4
0 . 8 4
0 . 9 4
0 . 0 5
5 8 9 6 5
4 8 2 5 5
0 4 6 3 5
1 5 0 2 5
4 1 5 0 5
8 2 0 9 4
0 9 5 7 4
0 0 2 6 4
5 5 8 4 4
4 5 5 3 4
5 9 2 2 4
7 7 0 1 4
8 9 8 9 3
7 5 7 8 3
2 5 6 7 3
3 8 5 6 3
8 4 5 5 3
5 4 5 4 3
4 7 5 3 3
4 3 6 2 3
3 2 7 1 3
0 4 8 0 3
6 8 9 9 2
7 5 1 9 2
5 5 3 8 2
7 7 5 7 2
3 2 8 6 2
2 9 0 6 2
3 8 3 5 2
6 9 6 4 2
0 3 0 4 2
4 8 3 3 2
8 5 7 2 2
0 5 1 2 2
1 6 5 1 2
9 8 9 0 2
5 3 4 0 2
6 9 8 9 1
0 . 3 5
0 . 2 5
0 . 3 5
0 . 4 5
0 . 5 5
0 . 6 5
0 . 7 5
0 . 8 5
0 . 9 5
0 . 0 6
0 . 1 6
0 . 2 6
0 . 3 6
0 . 4 6
0 . 5 6
0 . 6 6
0 . 7 6
0 . 8 6
0 . 9 6
0 . 0 7
0 . 1 7
0 . 2 7
0 . 3 7
0 . 4 7
0 . 5 7
0 . 6 7
0 . 7 7
0 . 8 7
0 . 9 7
0 . 0 8
0 . 1 8
0 . 2 8
0 . 3 8
0 . 4 8
0 . 5 8
0 . 6 8
0 . 7 8
0 . 8 8
4 7 3 9 1
7 6 8 8 1
5 7 3 8 1
9 8 9 7 1
4 3 4 7 1
4 8 9 6 1
7 4 5 6 1
2 2 1 6 1
0 1 7 5 1
0 1 3 5 1
1 2 9 4 1
4 4 5 4 1
7 7 1 4 1
0 2 8 3 1
4 7 4 3 1
7 3 1 3 1
0 1 8 2 1
2 9 4 2 1
3 8 1 2 1
3 8 8 1 1
1 9 5 1 1
7 0 3 1 1
1 3 0 1 1
2 6 7 0 1
1 0 5 0 1
7 4 2 0 1
0 0 0 0 1
0 6 7 9
6 2 5 9
9 9 2 9
7 7 0 9
2 6 8 8
3 5 6 8
9 4 4 8
0 5 2 8
7 5 0 8
9 6 8 7
6 8 6 7
0 . 9 8
0 . 0 9
0 . 1 9
0 . 2 9
0 . 3 9
0 . 4 9
0 . 5 9
0 . 6 9
0 . 7 9
0 . 8 9
0 . 9 9
0 . 0 0 1
0 . 1 0 1
0 . 2 0 1
0 . 3 0 1
0 . 4 0 1
0 . 5 0 1
0 . 6 0 1
0 . 7 0 1
0 . 8 0 1
0 . 9 0 1
0 . 0 1 1
0 . 1 1 1
0 . 2 1 1
0 . 3 1 1
0 . 4 1 1
0 . 5 1 1
0 . 6 1 1
0 . 7 1 1
0 . 8 1 1
0 . 9 1 1
0 . 0 2 1
0 . 1 2 1
0 . 2 2 1
0 . 3 2 1
0 . 4 2 1
7 0 5 7
4 3 3 7
5 6 1 7
0 0 0 7
0 4 8 6
3 8 6 6
1 3 5 6
3 8 3 6
9 3 2 6
8 9 0 6
1 6 9 5
7 2 8 5
7 9 6 5
0 7 5 5
6 4 4 5
6 2 3 5
8 0 2 5
4 9 0 5
2 8 9 4
3 7 8 4
7 6 7 4
3 6 6 4
2 6 5 4
4 6 4 4
7 6 3 4
4 7 2 4
2 8 1 4
3 9 0 4
6 0 0 4
1 2 9 3
8 3 8 3
7 5 7 3
8 7 6 3
1 0 6 3
6 2 5 3
2 5 4 3