Unit Operation
Power
The ZN510 controller is powered by 24 VAC. A total of two
Note: Power for field installed ancil- lary devices is not available from the board. It must be tapped at trans- former. See Table 21 for excess power available.
Factory Supplied Transformer
Line
Voltage
24VAC
Figure 4: Power Connections
Binary Outputs
The ZN510 uses five of its binary outputs to control heat pump units. Outputs are load side switching triacs. The triac acts as a switch by either making or breaking the circuit between the load (reversing valve, damper, contactor, relay) and ground.
See Figure 5 for the configuration of the five binary outputs.
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Generic Binary Output |
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Binary output 6 (BOP 6) is factory |
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configured to control a normally |
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closed |
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It may be field modified to control a |
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generic output for control by a |
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building automation system. If set up |
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as a generic output, the controller |
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does not use BOP 6 as part of the | Figure 5: Binary outputs | |
normal control. A building automation | ||
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system must issue commands to |
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control the generic binary output. | . | |
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| BOP 2 (ReversingValve) | BOP 3 (Not available) |
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| BOP 5 (Compressor 1) | BOP 6 (Compressor 2) |
| Field installed |
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| 2 position | ||||
| BOP 4 (Not Used) |
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| damper actuator | ||||
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| 24VAC | ||||||
BOP 1 (Fan) |
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| BOP 7 | |||||||
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| Binary Outputs |
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Note:
zDuring occupied mode, the outdoor air damper is closed when the fan is controlled off.
zDuring unoccupied mode, the outdoor air damper normally remains closed.
z
Table 1: BOP 6 control of a
Model | Fan Operation | Outdoor Air Damper | |
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Occupied | On or cycling | Open | |
Off | Closed | ||
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Occupied warm up or | On or cycling | Closed | |
cool down | |||
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Occupied standby | On or cycling | Closed | |
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Unoccupied | Cycling | Closed | |
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Diagnostic present | Diagnostic dependent | Closed | |
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