Outdoor Airflow Monitor - Greenheck ERCH-20 Installation, Operation And Maintenance Manual

Outdoor Airflow Monitor
For additional information on how to navigate through
the airflow controller menus, refer to technical manuals
GF-2200A from GreenTrol® Automation Inc. at www.
greentrol.com.
Field calibration procedure:
1. Turn off power to the unit using the power
disconnect(s).
2. Remove the cover from the GreenTrol airflow
monitoring controller.
3. Install a jumper wire between terminals R and G on
the unit's terminal board if one isn't present.
4. When safe, turn the power back on to the unit
using the power disconnect(s).
If no microprocessor controller, skip to step 8. Steps
5-7 are for microprocessor only.
5. Look at the unit's microprocessor controller screen
and view the status of the unit. If the displayed
status is "System Off" continue with step 6,
otherwise go to step 7.
6. Adjust the unit on/off priorities on the unit's
microprocessor controller so that the unit will run
for calibration.
a. Push the "Prg" button on the microprocessor
controller.
b. Use the up and down arrows to get to the "On/
Off Unit" menu.
c. Push the enter button to view the current unit
on/off priorities.
d. Push the down arrow to display the Unit ON/
OFF Control screen.
e. Record the settings below so they can be
changed back when calibration is complete.
By digit input:
By BMS:
By Scheduler:
f. Use the enter button to navigate between the
different settings on the page, use the up and
down arrows to change the values so that "By
digit input" is the only setting with "Yes".
7. Enter the service override menu to control the
damper position.
a. At the Home Screen push the "Prg" button. (If
you're not at the home screen push the escape
button until you get there).
b. Use the up and down arrows to get to the
"Service" menu, then push the enter button.
c. If you're asked for a password, enter "1000"
for the password and push enter.
d. Use the up and down arrows to get to the
"Overrides" screen, then push enter.
e. Use the arrow buttons to get the supply
override.
®
___________
___________
___________
8. Measure the supply airflow rate of the unit using an
approved test and balance method.
9. Without making any changes to the system,
calibrate the airflow monitoring controller so it
reads the airflow measured in step 8 by using the
Field Calibration Wizard.
a. The field calibration lasts for two minutes. Any
significant changes in airflow will affect the
accuracy of the reading.
b. To enter the Field Calibration Wizard, hold the
Down and Enter buttons simultaneously on the
airflow controller, then release the buttons.
c. Push the enter to enter to go Wizard 1
d. Push the enter button twice and change Wiz1
Enable to YES.
e. When asked for the number of calibration
points (Cal Points), set the value to 1.
f. Push the enter button when the display says
"Set Flow 1".
g. After completing the steps above, set the
FLOW1 value to the airflow measured in
step 8, then push the enter button to begin
calibration.
10. After the calibration is completed, measure the
supply airflow rate again and compare with the
value on the airflow controller's display
a. If the values are within 5% of each other the
device has been successfully calibrated.
b. If the values are not within 5% of each other
repeat the field calibration process.
11. If you had to change the On/Off priorities on the
microprocessor unit controller, change them back
to the values that were written down in part 6.
12. Turn off power to the unit using the power
disconnect(s) and wait one minute for the variable
frequency drive(s) to lose backup power.
13. Replace the cover to the GreenTrol airflow
monitoring station.
14. If you added a jumper between terminals R and
G in step 3 remove it at this time. If a jumper was
already in place, leave it in place.
15. When safe, turn the power back on to the unit
using the power disconnect(s).
a. Recycling of the power resets the manual
override values that were set during the
calibration.
Energy Recovery Ventilator with Heating and Cooling General Description - NOT model specific 37