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9
Unit Operation
Analog Outputs
ZN510 does not use analog outputs.
Binary Inputs
The ZN510 controller has three
available binary inputs (BI). These
inputs are factory-configured for
the following functions:
z BI 1= Low temperature
detection (freezestat) (Circuit 2).
z BI 2 = Condensate overflow.
z BI 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.
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.
BI 1
J2-1
J2-2
J2-3
J2-4
J2-5
J2-6
Field Wired
Occupancy Input
BI 2BI 3
Binary Inputs
Condensate Overflow
Low Temperature
Detection (Circuit 2)
Table 2: Binary input configurations
Binary Input Description
Configuratio
n
Contact
Closure
Contact
Open
BI 1
Low Temperature
Detection (Cir 2)
Normally
closed
Normal Diagnostic
BI 2 Condensate Overflow
Normally
closed
Normal Diagnostic
BI 3
Occupancy Normally open Unoccupied Occupied
Generic Normally open Normal Normal
Note:
See Page 10 for specific information concerning BI 1, BI 2 and BI 3.
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:
z Verify output wiring and
operation without using Trane’s
service tool, Rover.
z Force 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.