Install Instructions
45
Tech.Doc - 03/21 - Subject to change. © Belimo Aircontrols (USA), Inc.
Problem Possible Cause Action
Alarm
“Compressor 1
Not Detected”
Alarm
“Compressor 2
Not Detected”
Compressor safety open
• Check Low Pressure control.
• Check High Pressure control.
• Check Compressor Current protector.
Compressor contactor
coil bad
Check that there is resistance through the coil and compare to min requirements in technical document.
Inability to auto detect
If all items above have been verified good and circuit continuous, then in Settings menu under Devices 1, change
Compressor Qty from Auto to 1 or 2 to match number of compressors in the RTU. Once the Qty selected, the alarm will
clear, the user must verify the compressor does enable when it is supposed too.
There is No
Integrated
Cooling
Potential damper,
linkage, actuator
problem, or wiring
problem
In order for the ZIP Economizer to enter into Integrated Cooling mode, the damper must be close to full open (> 85%)
and Y2 must be enabled. See sequence of operation for more information. Check damper and linkage components as
addressed above. Check Y2 signal.
Damper rotation not
scaled
If the damper rotation is less than 85% and the Damper Scaling has not been run to scale the output to the damper travel,
then Integrated cooling will not ever occur.
SAT Y2 limit
If the SAT Y2 Limit is on in Settings menu, then Integrated Cooling will be disabled when SAT is below the specified
temperature. See sequence of operation for more information.
In time delay
There is a time delay after the damper reaches open till 2nd stage Integrated Cooling can occur. See sequence of
operation for more information.
Alarm “Energy
Module is
Missing.
Module
Functions
Disabled”
ZIP Economizer
cannot detect the ZIP-
ECON-EM, which was
previously detected as
installed
The following functions (if they were utilized) will be disabled:
• Purge.
• Remote damper override potentiometer.
• CO2 sensing and Demand Control Ventilation.
• Low Speed indoor fan control.
Full unplug per mounting instructions. Check plug and socket for any debris. Clean carefully if necessary. Re-install
Energy Module per Intallation Operation Manual instructions until you hear a snap indicating it is locked into place. If this
does not resolve problem, replace ZIP-ECON-EM.
Alarm
“Exhaust Fan
Not Detected”
Energy Module not
detected
Check that the Energy Module is Connected in the "Present Devices" menu. If not troubleshoot as above.
Wiring or exhaust fan
relay problem
When the ZIP Economizer is first powered, it detects the presence of the Exhaust Fan control circuit. If the circuit is
detected as open, this alarm will be generated. Check all wiring, connectors, and relay coil. Check that there is resistance
through the coil and compare to min requirements in technical document.
Inability to auto detect
If the two potential problems above have been verified, then there may be a problem with auto detecting. In "Settings"
menu under Devices 1, verify the set value is Auto or Installed. If set on Auto try setting value to Installed . Once Installed,
the alarm will clear, the user must verify the fan does enable as the damper passes the Exhaust Fan On Pos.
Alarm “2
Speed Fan Not
Detected”
Energy Module not
detected
Check that the Energy Module is Connected in the "Present Devices" menu. If not troubleshoot as above.
Wiring or indoor fan
relay problem
When the ZIP Economizer is first powered, it detects the presence of the Indoor Fan control circuit. If the circuit is
detected as open, this alarm will be generated. Check all wiring, connectors, and relay coil. Check that there is resistance
through the coil and compare to min requirements in technical document.
Inability to auto detect
If the two potential problems above have been verified, then there may be a problem with auto detecting. In "Settings"
menu under Devices 1, verify the set value is Auto or Available. If set on Auto try setting value to Available. Once set to
Available, the alarm will clear, the user must verify proper operation of IF output.
Alarm “CO2
Sensor Not
Detected. DCV
Functions
Disabled”
Energy Module not
detected
Check that the Energy Module is Connected in the "Present Devices" menu. If not troubleshoot as above.
Wiring or CO2 sensor
problem
When the ZIP Economizer is first powered, it detects the presence of power from the CO2 sensor. If the input signal at
CO2 input from Energy Module is missing and has been previously detected. DCV will be disabled. The damper will return
to Vent Min Pos. If the voltage input to CO2+ and CO2- is < DC 0.5 V then this alarm will occur. Check the following:
• Verify CO2 Sensor is set to 0...2000 ppm working range - DC 0 V (0 ppm) to DC 10 V (2000 ppm).
• Verify that AC 24 V power is available at sensor. If not, correct. If so, continue below.
• Validate reading of CO2 at sensor with a calibrated instrument.
• Check to see that sensor output voltage is correct (0.005 x actual ppm reading). Example: a measured CO2 reading at
the sensor is 1000 ppm. Voltage output from sensor should be .005 x 1000 = DC 5 V.
• Verify wiring continuity between sensor and ZIP-ECON-EM input CO2+ CO2-.
Alarm “CO2
Sensor Out of
Range. DCV
Functions
Disabled”
Wiring or CO2 sensor
problem
When the ZIP Economizer is first powered, it detects the presence of power from the CO2 sensor. If the input signal at
CO2 input from Energy Module is out of range and has been previously detected. DCV will be disabled. The damper will
return to Vent Min Pos. If the voltage input to CO2+ and CO2- is < DC 1.25 V (250 ppm)or > DC 11 V (2200 ppm) then this
alarm will occur. Troubleshoot as above "CO2 Sensor not detected".
ZIP Economizer
Troubleshooting