Larry393
New Member
Help! Should I be hearing air flow at my supply ducts? I purchased the most expensive system to help control air noise. It is my understanding that you should not hear the air flow with low pressure systems. I’m getting the feeling that the system ducting was not designed, just thrown together. The system is the following:
System: Dave Lennox Signature Collection 25 with Hydronic Coil
Size: 4 Ton
Condenser: XC25-048-230
AHU: CBA38MV-048-230 + TDR
AHRI: 201924711
Lennox HCHRV
iComfort WiFi S30 control system
2 Zone
I called initially when it was like a hurricane blowing through the house. The reason told was that the AHU fan motor could not be set lower than 1205 CFM. Their solution was to install a duct directly from the return directly to the supply that has a dampener in-line. I am and was concerned that this was probably not standard practice. Am I correct?
The “fix” did not work completely so I reached out to the installer. They initially wanted to come out and put in larger returns while not addressing the supply velocities. I asked them to tell me what the design flow was that they initially used. No response. This is telling me it was not designed.
I’m an engineer with a lot of construction background. Nothing in HVAC. This is why I am here looking for advice. I am not sure what to ask this company to do at this point. Should I ask to see a complete design before moving forward? Should the duct from return to supply be removed? Is it common to hear the supply air coming out of the duct?
Thank you
Larry
System: Dave Lennox Signature Collection 25 with Hydronic Coil
Size: 4 Ton
Condenser: XC25-048-230
AHU: CBA38MV-048-230 + TDR
AHRI: 201924711
Lennox HCHRV
iComfort WiFi S30 control system
2 Zone
I called initially when it was like a hurricane blowing through the house. The reason told was that the AHU fan motor could not be set lower than 1205 CFM. Their solution was to install a duct directly from the return directly to the supply that has a dampener in-line. I am and was concerned that this was probably not standard practice. Am I correct?
The “fix” did not work completely so I reached out to the installer. They initially wanted to come out and put in larger returns while not addressing the supply velocities. I asked them to tell me what the design flow was that they initially used. No response. This is telling me it was not designed.
I’m an engineer with a lot of construction background. Nothing in HVAC. This is why I am here looking for advice. I am not sure what to ask this company to do at this point. Should I ask to see a complete design before moving forward? Should the duct from return to supply be removed? Is it common to hear the supply air coming out of the duct?
Thank you
Larry