Trane VAV-UCM 4.2, Инструкция по установке и обслуживанию

Страница: 67 / 88

VAV-SVX01C-EN 67
Troubleshooting
3. Measure the receiver output resistance by following the procedures
• Make sure the black wire (GNS-SIGNAL) and the yellow wire (GND-POWER) are grounded
(see above for wiring diagrams).
• Make sure the receiver is powered up.
• Disconnect the SETPOINT wire (red) and the ZONE wire (white) from the host unit controller.
• Measure resistance between the grounded GND-SIGNAL wire and either the SETPOINT or
ZONE wire. Compare resistance measurements to those presented in
Table 20, p. 67 .
• When the test is complete, reset the receiver address to its previous setting.
• Press the Test button (S5) on the sensor to force re-association.
Confirm association and communication by noting LED1, LED2, and LED3 as described in "Signal
Quality Test"
• Pressing the Test button (S5) on the sensor initiates a signal quality test. LED1, LED2, and
LED3 respond by indicating excellent, marginal, or poor signal quality. The LEDs can be
observed on both the sensor (
Table 21, p. 67 ) and the receiver ( Table 20, p. 67 ).
• If sensor and receiver still do not operate properly, replace bad components. If unit passes
tests, check UCM operation.
4. Defective VAV UCM
• Disconnect the receiver sensor wires on the VAV UCM on terminals TB3-1 and TB3-2 and
measure the VDC. It should be 5VDC. If 5VDC is not present check incoming power to the
Table 20. Receiver resistance table
Zone or Setpoint Temperature
Nominal Zone Temperature
Output Resistance
Nominal Space Temperature
Setpoint Output Resistance
55
o
F (12.8
o
C) 17.47 k Ω 812 Ω
60
o
F (15.6
o
C) 15.3 k Ω 695 Ω
65
o
F (18.3
o
C) 13.49 k Ω 597 Ω
70
o
F (21.1
o
C) 11.9 k Ω 500 Ω
75
o
F (23.9
o
C) 10.5 k Ω 403 Ω
80
o
F (26.7
o
C) 9.3 k Ω 305 Ω
85
o
F (29.4
o
C) 8.25 k Ω 208 Ω
Table 21. Signal quality: LED1, LED2, LED3 on the sensor
User Action LED Display Indicates…
None LED1:Off
LED2:Off
LED3:Off Normal state
* No Test button press
Press Test
Button (SS)
LED1:Off
LED2:Off
LED3:Off
Associated; no communication with receiver
* Associated, but no signal from the receiver after
pressing Test button
LED1:On
LED2:On
LED3:On
Displays for 5 seconds, then constantly off
Excellence signal quality
* Adequate signal margin for reliable communication.
LED1:Off
LED2:On
LED3:On
Displays for 5 seconds, then constantly off Marginal signal quality
* Reduced battery life is likely.
* Consider moving the sensor or receiver to a better
location.
LED1:Off
LED2:Off
LED3:On
Displays for 5 seconds, then constantly off
Poor signal quality
* Unreliable communication.
* Strongly recommend moving the sensor or receiver to
a better location.