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Topic: Heat exchanger in wet bay question (Read 663 times) previous topic - next topic

Heat exchanger in wet bay question

Been keeping an eye on the heat exchanger in the wet bay, right side.  It seems warm, the feeder hoses are quite warm to the touch, but I am not sure if the fan is working.  I can't seem to ever catch it running.  I am assuming the fan is 12 volts?  Is there a way to check the operation of the fan?  Is there another exchanger on the other side behind the partition for the outside faucet, left side?  The thermostat is a bit confusing to me; it reads from 0 to 50.  I am assuming that the warmest setting would be 50?  Thanks for the help.
Mike
Mike Brady
'97 U320 SE. #5137
'13 Honda Fit
Willow Springs, MO

Re: Heat exchanger in wet bay question

Reply #1 –
Yes there is another heat exchanger/fan behind the wall in the wet bay. By turning the thermostat it should activate the fans. I had to replace the fan behind the wet bay and it is the same size as the one in the water pump bay.
Ron & Donna Brunson
1997 U320 40 ft.
Honda CR-V toad
Tangent, Oregon
Build #5032

Re: Heat exchanger in wet bay question

Reply #2 –
Mike,

Aqua Hot fan coils are located in the utility basement areas to protect them in cold weather.  The thermostat that controls the fans and pump 2 is in the basement also.  So when the basement thermostat calls for heat, pump 2 and the fan(s) in the basement turn on.

The reason you are feeling warm pipes and no fan operation is the basement fan coils along with the bathroom fan coil are a heating loop fed by pump 2.  Anytime pump 2 runs these coils get warm.  The pump 2 always runs when the burner is firing.  So burner operation for hot water or interior heat will heat up the basement and bathroom fan coils BUT the basement and bathroom fans will not turn on.

Hope this helps.
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas

Re: Heat exchanger in wet bay question

Reply #3 –
Quote
Is there a way to check the operation of the fan? 

Just make a glass of ice water and submerse sensor (forget what you call it). You'll see the fan go on and hear the one behind the wet bay partition.
jor
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