Aprilaire 8800 Addendum Manual

please read and replace the information provided with the respective pages found
in the Model 8800 thermostat and Model 8800 System installation manuals.
The Model 8800 communicating thermostat and Model 8819 distribution panel have been modified to provide enhanced
compatibility with various power supplies and grounding schemes. Please follow the instructions provided in this addendum
to properly install and configure these new products.
these changes effect the 8800 system in three main ways:
1. Power for the thermostat is now derived from the Model 8819 or separate 24VAC transformer (same as the Model
8870/8818 was) instead of the HVAC equipment.
2. The heat pump fault indicator feature has been removed from this product to make room for the new terminal layout.
3. The 8800 can now operate with dry contacts in humidistat mode without the use of a 8024.
If you experience any difficulty with these instructions or the installation of scenarios not discussed in this document, please
contact Aprilaire Technical Support at (888) 782-8638. Office hours are Monday through Friday, 7:00 a.m. – 5:00 p.m.
®
Central Standard Time.
AdditionAL noteS:
When replacing an 8870 thermostat with the model 8800 thermostat these additional steps are required in
order for proper operation.
1. Replace any 8061 TT Support Modules connected to the thermostat with 8081 TT Support Modules, but in cases where
a single flush mount and/or outdoor sensor is used they can be directly connected to the new 8800 Thermostat and the
Support Module can be eliminated.
2. Replace any 8062 TrH Support Modules connected to the thermostat with 8082 TrH Support Modules.
iMportAnt AddenduM
Model 8800 Addendum
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