Zn010, Zn510, And Zn520 Controllers - Trane UniTrane Installation, Operation And Maintenance Manual

Measuring Output Resistance
To measure the resistance of receiver outputs for zone
temperature and setpoints for all models, and heating
setpoint and fan/system for the WDS:
1. Ensure that the GND-SIGNAL (black) wire and the
GND-POWER (yellow) wire are grounded to the
transformer.
2. Disconnect the ZONE (white) and SETPOINT (RED)
wires from the controller. Disconnect the HEAT
SETPOINT (brown) and FAN/SYSTEM (green) wires
from the controller, if applicable.
3. Measure resistance as follows:
a. All models: Measure between the grounded GND-
SIGNAL (black) wire and either the SETPOINT (red)
or ZONE (white) wire. Compare resistance
measurements to those in table below.
Table 70. Receiver resistance table for all models
Nominal zone
Zone or setpoint temperature
temperature output resistance
55°F (12.8°C) 17.47 kΩ
60°F (15.6°C)
65°F (18.3°C) 13.49 kΩ
70°F (21.1°C)
75°F (23.9°C)
80°F (26.7°C
85°F (29.4°C)

ZN010, ZN510, and ZN520 Controllers

LED Activity
Green Status LED The green LED normally indicates
whether the controller is powered on (24 Vac supplied).
Refer to the table below.
Table 72. Green status LED activity for Tracer® ZN010,
ZN510, or ZN520 controllers
Green LED Activity
On continuously
Blinks (one blink)
Blinks (two blinks)
LED blinks (1/4 second on, 1/4
second, off for 10 seconds)
LED off
UNT-SVX07J-EN
Nominal setpoint/
heating setpoint
output resistance
792 Ω
15.3 kΩ 695 Ω
597 Ω
11.9 kΩ 500 Ω
10.5 kΩ 403 Ω
9.3 kΩ 305 Ω
8.25 kΩ 208 Ω
Description
Power on (normal operation).
The controller is in manual output
test mode.
No diagnostics present.
The controller is in manual output
test mode.
One or more diagnostics are
present.
(a)
Wink mode.
Power is off.
Controller failure.
Test button is pressed.
Diagnostics and Troubleshooting
b. WDS only: Measure between the grounded GND-
SIGNAL (black) wire and the FAN/SYSTEM (green)
wire. Compare resistance measurements to those
given in the table below.
Note: The output circuits are not electrically
powered; consequently, resistance can be
measured without risk of damage to the
volt-ohm meter.
Table 71. Receiver resistance table for model WDS
Fan command
High
Med
Low
Auto
Off
Cleaning the Sensor
NOTICE:
Equipment Damage!
Spraying glass cleaner or any other solution directly on
the sensor may damage it.
You can clean the sensor by applying glass cleaner to a
soft, non-abrasive cloth, and gently wiping the face,
including the buttons and LCD display. Use of a pre-
moistened towelette designed for lens or screen cleaning
is also acceptable.
Avoid inadvertent pressing of the Occupied/Unoccupied
buttons on the keypad on the WDS sensor as this may
result in an unwanted timed override or settings change.
(a) The Wink feature allows you to identify a controller. By sending a re-
quest from the Rover service tool, you can request the controller to wink
(blink on and off as a notification that the controller received the signal).
The green LED blinks (1/4 second on, 1/4 second off for 10 seconds)
during Wink mode.
Yellow Comm LED The yellow comm LED blinks at the
rate the controller receives communication. The yellow
LED does not blink when the controller is transmitting
communication data. Refer to the table below.
Table 73. Yellow comm LED activity for Tracer® ZN010,
ZN510, or ZN520 controllers
LED Activity Description
The controller is not detecting any
Off continuously communication. (Normal for standalone
applications.)
The controller detects communication.
LED blinks or flickers (Normal for communicating applications,
including data sharing.)
Abnormal condition or extremely high traffic
LED on continuously
on the link. High traffic on the link.
Nominal output resistance
16,130 Ω
13,320 Ω
10,770 Ω
2320 Ω
4870 Ω
137