Troubleshooting
Manual Output Testing the Heat | for at least three seconds to | |
Pump Configurations | start the test mode. | |
The procedure for testing heat pump | 2. The test sequence resets | |
configurations is: | ||
diagnostics and turns off all | ||
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1. Press and hold the Test button | outputs. | |
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Table 12: Test sequence
3.Press the Test button several more times (no more than once per second) to advance through the test sequence.
| Step |
| Fan | Reversing Valve | Compr 1 | Compr 2 | Damper | |
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| BOP 1 | BOP 2 | BOP 4 | BOP 5 | BOP 6 | ||
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| 1. Off |
| Off | Off | Off | Off | Closed | |
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| 2. Fan on (At the beginning of step 2, the |
| On | Off | Off | Off | Closed | |
| controller attempts to clear all diagnostics). |
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| 3. Reversing Valve |
| On | On | Off | Off | Closed | |
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| 4. Cool 1 |
| On | On | On | Off | Closed | |
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| 5. Cool 2 |
| On | On | On | On | Closed | |
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| 6. Compressor(s) off |
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| This stage helps avoid compressor cooling |
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| and heating in sequential steps by turning the |
| On | Off | Off | Off | Closed | |
| compressors off prior to changing the |
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| reversing valve state. |
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| 7. Heat 1 |
| On | Off | On | Off | Closed | |
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| 8. Heat 2 |
| On | Off | On | On | Closed | |
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| 9. Outdoor air damper |
| On | Off | Off | Off | Open | |
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| 10. Exit |
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| After the outdoor air damper step, the test |
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| sequence performs the exit step. This |
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| initiates a reset and attempts to return the |
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| controller to normal operation. |
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Testing the Heat Pump
Configurations
The outputs are not subject to minimum times during the test sequence. However, the test sequence only permits one step per second which limits output time.
All outputs are exercised regardless what timer they are or are not configured for. For example, single compressor heat pumps function
the same as two compressor units. For single compressor units, the cool 2 and heat 2 steps control the appropriate binary outputs, but do not affect unit operation.
Reversing valve and damper outputs cycle independent of configuration.
Pump Operation for
Systems with ZN510
Loop Controller
During Unoccupied, the pumps will be OFF but should be energized to test compressor operation. The user must override the pumps either at the ZN510 Loop Controller or by pushing the ON button of the zone sensor. This will send the units to an occupied bypass, which will turn the
pumps on prior to operating manual output test.
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