Air Coil Fan Motor Removal
CAUTION
Before attempting to remove fan motors or motor mounts, place a piece of plywood over evaporator coils to prevent coil damage.
Disconnect motor power wires from motor terminals before motor is removed from unit.
1.Shut off unit main power supply.
2.Loosen bolts on mounting bracket so that fan belt can be removed.
3.Loosen and remove the 2 motor mounting bracket bolts on left side of bracket.
4.Slide motor/bracket assembly to extreme right and lift out through space between fan scroll and side frame. Rest motor on a high platform such as a step ladder. Do not allow motor to hang by its power wires.
Replacing the WSHP Open Controller’s Battery — The WSHP Open controller’s
NOTE: Power must be ON to the WSHP Open controller when replacing the battery, or the date, time and trend data will be lost.
1.Remove the battery from the controller, making note of the battery's polarity.
2.Insert the new battery, matching the battery's polarity with the polarity indicated on the WSHP Open controller.
TROUBLESHOOTING
(Fig. 32 and 33, and Table 32)
When troubleshooting problems with a WSHP, consider the following.
Thermistor — A thermistor may be required for single- phase units where starting the unit is a problem due to low voltage. See Fig. 32 for thermistor nominal resistance.
Control Sensors — The control system employs 2 nom- inal 10,000 ohm thermistors (FP1 and FP2) that are used for freeze protection. Be sure FP1 is located in the discharge fluid and FP2 is located in the air discharge. See Fig. 33.
WSHP Open Controller — With the WSHP Open con- troller option, the 100 most recent alarms can be viewed using the BACview6 alarm status and alarm history.
To view the alarms:
1. Navigate to the Alarm Status screen from the Home screen using the arrow softkeys. The screen will display the current alarm status, either normal or Alarm, and al- low for scrolling through the unit’s alarm status.
2. From the Alarm Status screen, press the Alarm softkey to view the 100 most recent alarms which are labeled with date and time for easy reference.
NOTE: Active faults can be viewed by scrolling down, these faults indicate a possible bad sensor or some condi- tion which may not merit an alarm.
3. To view alarms which have been corrected, scroll down through the Alarm screen to Return Top Normal screen.
NOTE: Alarms are automatically reset once alarm con- dition has been corrected.
See Table 32 for possible alarm cause and solution.
| 90.0 | |
| 80.0 | |
| 70.0 | |
(kOhm) | 60.0 | |
50.0 | ||
Resistance | ||
40.0 | ||
| 30.0 | |
| 20.0 | |
| 10.0 | |
| 0.0 |
0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0
Temperature (degF) | |
|
Fig. 32 — Thermistor Nominal Resistance
a50-8163
AIRFLOW
(°F)
THERMISTOR
AIR |
COIL |
AIRFLOW
(°F)
EXPANSION
VALVE
FP2FP1
COAX
SUCTION
COMPRESSOR
DISCHARGE
| CONDENSATE |
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| OVERFLOW | LIQUID |
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| (CO) |
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| LINE | WATER IN | WATER OUT | |||
| LEGEND |
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| AIR COIL |
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| WATER |
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COAX — Coaxial Heat Exchanger | FREEZE |
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COIL |
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| Airflow | PROTECTION |
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| PROTECTION |
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Refrigerant Liquid Line Flow
Fig. 33 — FP1 and FP2 Thermistor Location
40
