41
0
6/16 -
S
ubject to change.
©
Belimo Air
controls (U
S
A), Inc
.
ZIP Economizer
Troubleshooting
Troubleshooting
Problem
Possible Cause
Action
The ZIP
Economizer
/ Mechanical
Cooling Not
Operating
No input power
Using a voltmeter set to read AC voltage, verify that there is 24 VAC +/- 20% (19 VAC – 29 VAC) as measured at the “R” and
“C” terminals on the ZIP-ECON-BASE terminal strip on the base unit. If no voltage, check transformer output voltage at RTU.
If 24 volts not present, check primary input power to transformer. If voltage present, check transformer circuit breaker, and
check transformer for open coil. If no voltage present, check primary input power to RTU, fuses, disconnect, circuit breaker.
Setup not complete
If the display reads “Setup Incomplete”, then not all of the required setup parameters values for minimum damper position
and zip code have not been entered. Enter required information in Settings menu. See setup information.
Brownout
If voltage is below 19 volts, then the ZIP Economizer may be in Brownout Protection mode. This mode diables the
compressors to protect them from low voltage operation damage. When the power is back to normal the Economizer and
RTU will operate normally (see Brownout below).
In acceptance test or
manual mode
If the Yellow LED is lighted, then the ZIP Economizer is in a mode other than Automatic. End Mode by fi nding menu Item
"Return to Automatic". Refer to menu fl ow diagram.
There are No
Characters
Displayed
on the ZIP
Economizer
No input power
Using a voltmeter set to read AC voltage, verify that there is 24 VAC +/- 20% (19 VAC – 29 VAC) as measured at the “R” and
“C” terminals on the ZIP-ECON-BASE terminal strip on the base unit. If no voltage, check transformer output voltage at RTU.
If 24 volts not present, check primary input power to transformer. If voltage present, check transformer circuit breaker, and
check transformer for open coil. If no voltage present, check primary input power to RTU, fuses, disconnect, circuit breaker.
Ambient temperature
below display range
Below this value, the display may not be clearly visible. It should still control properly even though the display may be blank
below this temperature.
The Display
Shows
“Brownout”
Input voltage is below
18VAC / connected
load is too much for
transformer
Using a voltmeter set to read AC voltage, verify that that the voltage is low. If the voltage is low check primary voltage into
the RTU. If primary voltage is below the rated RTU voltage as listed on nameplate or product documentation, the primary
power is in a brownout state. If voltage is within specifi ed range, it is possible that the load on the transformer is larger
than VA rating. Verify connected current, if OK, consider replacing transformer.
The Display
Shows “Setup
Incomplete”
The initial setup of the
ZIP Economizer has not
completed
The ZIP Economizer requires parametizing of specifi c settings prior to operation of the economizer or compressors. As
a minimum the Vent Min Pos and ZIP Code / Postal Code need to have a value set and entered. If additional devices are
attached (e.g. CO2, EF,..) then additional parametizing is required.
Additional devices have
been added after initial
setup
Some additional devices that may be added at anytime during the life of the ZIP Economizer will require additional setup.
Upon connection of these devices the economizer will notify that the device has been detected and will prompt setup. Until
setup is complete, the ZIP Economizer will function as if the devices are not there. Proceed to Settings menu and look for
menu items that have a blank value, press OK and enter value. Once all values have been paramatized, the ZIP Economizer
will function as intended.
There is No
Free Cooling
Display shows “OAT
sensor out of range
economizing is disabled”
Sensor is returning a value that is out of the predetermined range. This disables the economizer functions and outdoor
air damper will return/remain at minimum position. This is a mandatory sensor and must be functional! Repair or replace.
Verify sensor value by disconnection sensor leads from ZIP-ECON-BASE and measure resistance with Ohm meter across
sensor leads and compare to 10K type 2 Thermistor Table values to measured values to the value of a temperature
instrument. If values are signifi cantly different, replace sensor.
Display shows “OAT
Sensor not detected
economizing is disabled”
Sensor is not present/not detected. This disables the economizer functions and damper will return/remain at minimum
position. This is a mandatory sensor and must be functional! Repair or replace. Verify sensor value by disconnection sensor
leads from ZIP-ECON-BASE and measure resistance with Ohm meter across sensor leads and compare to 10K type 2
Thermistor Table value to measured value to the value of a temperature instrument. If value is close, determine if there
is any intermediate wiring. If so, check continuity. If all checks are good, attach sensor to ZIP-ECON-BASE and see if it is
detected. If not detected, try another 10k type 2 sensor. If still not detected, replace ZIP-ECON-BASE.
Display shows “OAH
Sensor out of range
economizing is disabled”
If the economizer was originally set for enthalpy high limit changeover, then the economizer will not function without a
valid OAH signal. The valid range for reading an OAH sensor for auto detection is 0.6VDC (6%RH) to (100%RH) up to 11.0
VDC. Using a voltmeter set to read AC input voltage at TH sensor terminal R, verify that there is 24 VAC +/- 20% (19 VAC –
29 VAC). If input voltage is not with in range, verify input voltage at ECON-ZIP-BASE terminals R and C, if also out of range,
troubleshoot RTU control circuit. If the input voltage is within range, remove wires from RH+ and RH- and measure across
the two terminal using voltmeter set to DC. If DC output voltage is not within valid range above, replace sensor.
Display shows “OAH
Sensor not detected
economizing is disabled”
If the economizer was originally set for enthalpy high limit changeover, then the economizer will not function without a valid
OAH signal. The valid range for reading an OAH sensor for auto detection is 0.6VDC (6%RH) to (100%RH) up to 11.0 VDC.
Using a voltmeter set to read AC input voltage at TH sensor terminal R, verify that there is 24 VAC +/- 20% (19 VAC – 29
VAC). If input voltage is not with present, check continuity of wiring between ECON-ZIP-TH sensor and ECON-ZIP-BASE, If
voltage is present, remove wires from RH+ and RH- and measure across the two terminal using voltmeter set to DC. If DC
output voltage is within valid range above, check continuity of RH+ and RH- output wires between ECON-ZIP-TH sensor and
ECON-ZIP-BASE. If continuity OK, go to settings menu and submenu Device 2. Verify that display for OAH is Auto or Installed.
If Auto, change it to Installed and see if Alarm disappears or a value OAH value is displayed in Monitor Live Conditions menu.
Also can try to delete alarm and see if sensor is again auto detected.
