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ERV
SYSTEM MONITORING
The cooling output statuses are the following:
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Binary Input 19 “Cooling_Enable_1.Val” for stage one or modulating types where the demand
is greater than 0
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Binary Input 20 “Cooling_Enable_2.Val” for stage two
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Analog Input 33 “Cooling_Command.Val” shows a percentage for the 0–10V output.
12.5.5.4 Economizer Control
The economizer will be enabled when there is a call for cooling and the outdoor is more
favorable than the return air. In this case it will open the bypass damper to bypass the enthalpic
core and thus inhibit the exchange of energy. During this time the unit still uses 100% OA.
Economizing is allowed when both of the following Are below their limit:
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Analog Value 52 “Economizer.Econ_Low_OA_Temp_Limit”
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Analog Value 58 “Economizer.Econ_Low_RA_Temp_Limit”
12.5.6 Frost Control
The frost control function is enabled, when the OA is lower than Analog Value 77 “Defrost_OA_
SetP.Val” minus Analog Value 78 “Defrost_OA_SetP.DBright,” and turns off again when the OA
exceeds the AV77. During this time, the supply fan is OFF and the OA damper is closed.
12.5.7 Filter Monitoring
Filter pressures are read through Analog Input 24 “RA_Flt_Press.Val” and Analog Input 25
“OA_Flt_Press.Val.”
Filter alarm levels are set at Analog Value 35 “RA_Flt_AlarmHigh” and Analog Value 36 “OA_
Flt_AlarmHigh.”
12.5.8 Exhaust Fan Only Mode
If BMS control is enabled, the unit can also be put in exhaust fan only mode in occupied
operation using Binary Value 74 “UnitOnOffMng.BMSEFOnly.”
12.6 ADDING A BACNET LICENSE
12.6.1 Obtaining a BACnet License
If your controller does not have a BACnet license, contact whoever provided the unit to obtain
one. You will need the Hardware ID number on this screen when ordering. Be sure to copy it
carefully or the license will not work.
The license will be delivered as a file with extension “.ap1.”
12.6.2 Installing the BACnet License via Web Page
Prerequisites
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Have ap1 BACnet upgrade file(s) located on your PC
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Ethernet connection from the PC to the controller and view the web page
Steps
1. Go to the Upgrade Tab in the web pages.