41
T_C-IOM-2A
Trouble Shooting
Unit Economizer Control (ECA)
Troubleshooting
ReliaTel Control
Verify Economizer Status by Econo-
mizer Actuator (ECA) LED indicator:
OFF:
No Power or Failure
ON:
Normal, OK to
Economize
Slow Flash:
Normal, Not OK to
Economize
Fast Flash:
Communications
Failure
Pulse Flash:
Error Code:
1 Flash:
Actuator Fault
2 Flashes:
CO2 Sensor
3 Flashes:
RA Humidity Sensor
4 Flashes
RA Temp Sensor
5 Flashes:
OA Quality Sensor
6 Flashes:
OA Humidity Sensor
7 Flashes:
OA Temp Sensor
8 Flashes:
MA Temp Sensor
9 Flashes:
RAM Fault
10 Flashes:
ROM Fault
11 Flashes:
EEPROM Fault
HAZARDOUS VOLTAGE!
HIGH VOLTAGE IS PRESENT AT THE
TERMINAL BLOCK OR UNIT
MOUNTED DISCONNECT SWITCH.
To prevent injury or death from electrocu-
tion, it is the responsibility of the techni-
cian to recognize this hazard and use ex-
treme care when performing service pro-
cedures with the electrical power ener-
gized.
Cooling Failure
1. Cooling and heating set point (slide
pot) on the thermostat has failed.
2. CC1 or CC2 24 VAC control circuit
has opened, check CC1 & CC2 coils,
and any of the controls below that ap-
ply to the unit (HPC1, HPC2, LPC1,
LPC2, Frostat™).
Resetting Cooling and Heating
Lockouts
Cooling Failures and Heating Lockouts
are reset in an identical manner. Method
1 explains resetting the system from the
space; Method 2 explains resetting the
system at the unit.
Method 1
To reset the system from the space, turn
the “Mode” selection switch at the ther-
mostat to the “Off” position. After ap-
proximately 30 seconds, turn the
“Mode” selection switch to the desired
mode, i.e. Heat, Cool or Auto.
Method 2
To reset the system at the unit, cycle the
unit power by turning the disconnect
switch “Off” and then “On”.
Summary of Contents for Precedent TSC060
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