Troubleshooting
54
RT-SVX46G-EN
Unit Economizer Control (ECA)
Troubleshooting
ReliaTel™ Control
Verify Economizer Status by Economizer Actuator (ECA)
LED indicator:
•
OFF: No power or failure
•
ON: Normal, OK to economize
•
Slow Flash: Normal, not OK to economize
•
Fast Flash - 1/2 second on / 2 seconds off:
•
Error Code: Communications failure
•
Pulse Flash:2 seconds on / 1/2 second off:
•
Error Code:
•
1 Flash: Actuator Fault
•
2 Flashes: CO
2
Sensor
•
3 Flashes: RA Humidity Sensor
Table 12. Fault detection and diagnostic codes
Primary Fault Codes
Information Code
Failures
Mixed Air
Temp
Sensor
Fail
Outdoor
Temp
Sensor
Fail
Economizer
Actuator
Fault
RTEM
Comm
Fail
Pressure
Dead band
Fail
(If Used)
Temp
Sensor
Fail
(If Used)
Airflow
Sensor Fail
(If Used)
Space
Press Dead
band Fail
(If Used)
Unit Fails
to
Economize
Unit
Economizing
When It
Should Not
Damper
Position %
Indicated
Damper stuck
at Minimum
X
X
(a)
X
*
X
X
Damper Stuck
Open
X
X
X
Mixed Sensor
Failure
X
X
Supply Air
Sensor Failure
X
X
Outdoor Air
Temperature
Fail
X
X
Power loss to
RTEM
X
Failed or Power
Loss to
Actuator
X
X
Mechanical
Failure of
Actuator
X
(a) If goes out of range.
Table 13. Low leak economizer sensor values
Sensor Values Data
Temp °F
Resistance
(K ohms)
Temp °F
Resistance
(K ohms)
Temp °F
Resistance
(K ohms)
40
26.097
54
17.847
68
12.435
41
25.383
55
17.382
69
12.126
42
24.690
56
16.930
70
11.827
43
24.018
57
16.491
71
11.535
44
23.367
58
16.066
72
11.252
45
22.736
59
15.654
73
10.977
46
22.132
60
15.253
74
10.709
47
21.530
61
14.864
75
10.448
48
20.953
62
14.486
76
10.194
49
20.396
63
14.119
77
9.949
50
19.854
64
13.762
78
9.710
51
19.330
65
13.416
79
9.477
52
18.821
66
13.078
80
9.250
53
18.327
67
12.752
81
9.030
