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 C
ode: Communications failure
• Pulse Flash:2 seconds on / 1/2 second off:
• Error Code:
• 1 Flash: Actuato
r Fault
• 2 Flashes: CO
2
Sensor
• 3 Flashes: RA H
umidity Sensor
Table 12. Fault detection and diagnostic codes
Primary Fault Codes Information Code
Failures
Mixed Air
Tem
p
Sen
sor
Fail
Outdoor
Tem
p
Sensor
Fail
Economizer
A
ctuat
or
Fault
RTEM
Com
m
Fail
Pressure
De
ad b
and
Fail
(If Used)
Temp
Se
ns
or
Fail
(If Used)
Airflow
Sensor Fail
(If U
se
d)
Space
Press Dead
band Fail
(If Used)
Unit Fails
to
Ec
onomize
Unit
Economizing
When It
Should Not
Damper
Positio
n %
Indicated
Damper stuck
at Mi
nimum
X X
(a)
X
(a)
* X
(a)
X X
Damper Stuck
Open
X X
(a)
X
(a)
X
(a)
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
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