Installation Manual
44    Hydronic Air Handler Installaon and Operaon Manual  
❶ 
❷ 
2.  Remove the air handler access panel by removing the four 
screws that secure the panel.  
3.  Locate the PC Board.  
4.  On the PC Board, remove the wire lead from the “MTR” tap (this 
tap controls the fan motor speed). See in image below. 
Default Setting Speeds 
Model  Speed 
•  AH083CP 
•  AH083P 
Medium 
•  AH084CP 
•  AH084P 
Medium 
•  AH125CP 
•  AH125P 
Medium 
•  AH166CP 
•  AH166P 
High 
•  AH206CP 
•  AH206P 
High 
Failure to not disconnect power can result in 
electrical shock, personal injury or death.  
 WARNING 
Fan Motor Speed Wire Lead Color Code 
Speed  Color 
High  Black 
Medium  Blue 
Low  Red 
6.  Connect the unused wire lead to the “Blank” tap. 
7.  Replace the air handler access panel.  
The speed of the air handler is factory default set as per the table to 
the right. To adjust speed settings, follow the steps below:  
1.  Disconnect power to the air handler.  
5.  Remove the desired wire lead from the “Blank” tap and place in the “MTR” tap (the “Blank” tap is 
where unused fan motor speed wire leads are stored). See in image below. Refer to the 
following table for wire lead color descriptions:  
❶ 
❷ 
MTR Tap  
(Controls fan  
motor speed) 
MTR 
Blank 
Blank Tap  
(Stores unused fan motor 
speed wire leads) 










