12-25-2020, 05:58 PM
I am not trying to jerk you around. I am asking those specific questions because of unusual setup that AH uses which throws even an experienced electrical dude for a loop. Rudy said it, but let me emphasize it.
The tstat puts out a 12V positive signal. Aquahot uses a ground signal to turn the zone off and on. Simply feeding the tstat signal to the AH produces NOTHING. The way it works is the positive signal is fed to a standard Bosch style relay mounted on the AH. When the relay sees a positive signal it closes as you know. When it closes, it connects the 85 and 86 terminals to GROUND. This is bassackards from how relays are normally used to connect 85 and 86 to a Positive source. So, identify the black relay that has the tstat input from TSTAT 1. Is it getting a 12V positive signal on the input terminal ? If so, is it passing continuity from 85 to 86? And is that continuity grounded?
The tstat puts out a 12V positive signal. Aquahot uses a ground signal to turn the zone off and on. Simply feeding the tstat signal to the AH produces NOTHING. The way it works is the positive signal is fed to a standard Bosch style relay mounted on the AH. When the relay sees a positive signal it closes as you know. When it closes, it connects the 85 and 86 terminals to GROUND. This is bassackards from how relays are normally used to connect 85 and 86 to a Positive source. So, identify the black relay that has the tstat input from TSTAT 1. Is it getting a 12V positive signal on the input terminal ? If so, is it passing continuity from 85 to 86? And is that continuity grounded?
Richard and Rhonda Entrekin
99 Newell, 512
Maverick Hybrid Toad
Inverness, FL (when we're home
)