Unit Operation
Output Overrides
The ZN510 controller includes a manual output test function. Use this feature to manually exercise the outputs in a defined sequence. The purpose of the test sequence, is to verify output and end device operation. Use the manual output test to:
zVerify output wiring and operation without using Trane’s service tool, Rover.
zForce compressor operation, allowing the technician to use refrigerant gauges or other test equipment to verify unit operation.
The test sequence resets unit diagnostics and attempts to restore normal unit operation prior to testing the outputs. If the diagnostics remains after a reset, the status LED indicates the diagnostic condition is still present and has affected the
manual output test. See Troubleshooting section for Green LED and Testing Heat Pump Configurations on page 21 & 22.
Analog Outputs | ZN510 does not use analog outputs. |
Binary Inputs
The ZN510 controller has three available binary inputs (BI). These inputs are
zBI 1= Low temperature detection (freezestat) (Circuit 2).
zBI 2 = Condensate overflow.
zBI 3 = Occupancy or generic binary input.
Each binary input may be configured as not used depending on options selected. BI 3 is configured as a normally open occupancy input, but may be field modified for generic binary input which is only supported by a build- ing automation system.
Low Temperature Detection (Circuit 2)
Condensate Overflow
Field Wired Occupancy Input
BI 1
BI 2
BI 3
Binary Inputs
Note:
The diagnostic functions related to binary inputs such as low tempera- ture detection and condensate overflow are fixed sequences.
Each binary input associates an input signal of 0 VAC with open contacts and 24 VAC with closed contacts. See Figure 6 for typical binary input configurations for the heat pump.
Figure 6: Binary inputs.
Table 2: Binary input configurations
Binary Input | Description | Configuratio | Contact | Contact | |
n | Closure | Open | |||
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BI 1 | Low Temperature | Normally | Normal | Diagnostic | |
Detection (Cir 2) | closed | ||||
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BI 2 | Condensate Overflow | Normally | Normal | Diagnostic | |
closed | |||||
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BI 3 | Occupancy | Normally open | Unoccupied | Occupied | |
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Generic | Normally open | Normal | Normal | ||
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Note:
See Page 10 for specific information concerning BI 1, BI 2 and BI 3.
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