ZN010, ZN510, and ZN520 Controllers
136
UNT-SVX07E-EN
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 71
.
b. WDS only: Measure between the grounded GND-
SIGNAL (black) wire and the FAN/SYSTEM (green)
wire. Compare resistance measurements to those
given in
Table 72
.
Note:
The output circuits are not electrically
powered; consequently, resistance can be
measured without risk of damage to the
volt-ohm meter.
Cleaning the Sensor
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.
LED Activity
Green Status LED
The green LED normally indicates
whether the controller is powered on (24 Vac supplied).
Refer to
Table 73
.
Table 71.
Receiver resistance table for all models
Zone or setpoint
temperature
Nominal zone
temperature
output resistance
Nominal setpoint/
heating setpoint
output resistance
55°F (12.8°C)
17.47 k
Ω
792
Ω
60°F (15.6°C)
15.3 k
Ω
695
Ω
65°F (18.3°C)
13.49 k
Ω
597
Ω
70°F (21.1°C)
11.9 k
Ω
500
Ω
75°F (23.9°C)
10.5 k
Ω
403
Ω
80°F (26.7°C
9.3 k
Ω
305
Ω
85°F (29.4°C)
8.25 k
Ω
208
Ω
Table 72. Receiver resistance table for model WDS
Fan command
Nominal output resistance
High
16,130
Ω
Med
13,320
Ω
Low
10,770
Ω
Auto
2320
Ω
Off
4870
Ω
NOTICE:
Equipment Damage!
Spraying glass cleaner or any other solution directly on
the sensor may damage it.
ZN010, ZN510, and ZN520 Controllers
Diagnostics and Troubleshooting
Table 73. Green status LED activity for Tracer ZN010,
ZN510, or ZN520 controllers
Green LED Activity
Description
On continuously
Power on (normal operation).
Blinks (one blink)
The controller is in manual output
test mode.
No diagnostics present.
Blinks (two blinks)
The controller is in manual output
test mode.
One or more diagnostics are
present.
LED blinks (1/4 second on, 1/4
second, off for 10 seconds)
Wink mode.
(a)
(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.
LED off
Power is off.
Controller failure.
Test button is pressed.
