I hate to ask. Recently had IDS 2.0 3 ton 15 seer installed. No issues cooling season per se. However, heating season has been a challenge because I understood that system had 10 speeds and should be modulating which I thought would be noticeable in the outdoor unit. But, every time the unit calls for heat the fan in the outdoor seems to be at once speed (High) ALL the time. I thought it was adjusting to meet demand and that meant different fan speeds that I saw during cooling season. Had HVAC installers here several times and they said everything was normal. What gives?
Cooling season it is a ten speed and does its best to maintain around 86 degrees on the outdoor heat exchanger. During Heating we would get 8 speeds but under 50 degrees outdoor temperature it really is a 3 speed. The need for heat extraction with the size of the coils requires a certain amount of CFM. The fan speed is dependent on the frequency of compressor and outdoor ambient. If the Outdoor heat exchanger were twice as large, or multi pass for surface area, we would move less air. The size of unit and cost of coil is a trade off for required cfm.
In a defrost scenario where Bova sends 24 volts back up to a furnace for a gas heat call. Some furnace controls will kill the blower while initializing the burner lite process and will bring the blower back on 30 to 40 seconds once the flame has been established. Is this a problem for the condenser? Going so long without the blower running.
With a Y call on the control board the furnace should not kill the blower at any time. The Y from thermostat connects to the furnace and out door unit both, when the outdoor unit redirects the 24v to W the indoor unit will give the still powered Y is chosen for blower speed.
Yes it will function fine, Unico had AHRI matches in the past but may no longer have ratings if your looking for rebates. You would still use the Unico Coil.
I hate to ask. Recently had IDS 2.0 3 ton 15 seer installed. No issues cooling season per se. However, heating season has been a challenge because I understood that system had 10 speeds and should be modulating which I thought would be noticeable in the outdoor unit. But, every time the unit calls for heat the fan in the outdoor seems to be at once speed (High) ALL the time. I thought it was adjusting to meet demand and that meant different fan speeds that I saw during cooling season. Had HVAC installers here several times and they said everything was normal. What gives?
Cooling season it is a ten speed and does its best to maintain around 86 degrees on the outdoor heat exchanger. During Heating we would get 8 speeds but under 50 degrees outdoor temperature it really is a 3 speed. The need for heat extraction with the size of the coils requires a certain amount of CFM. The fan speed is dependent on the frequency of compressor and outdoor ambient. If the Outdoor heat exchanger were twice as large, or multi pass for surface area, we would move less air. The size of unit and cost of coil is a trade off for required cfm.
@@johnstonecg
Thanks! Ok thank you.
In a defrost scenario where Bova sends 24 volts back up to a furnace for a gas heat call.
Some furnace controls will kill the blower while initializing the burner lite process and will bring the blower back on 30 to 40 seconds once the flame has been established.
Is this a problem for the condenser? Going so long without the blower running.
With a Y call on the control board the furnace should not kill the blower at any time. The Y from thermostat connects to the furnace and out door unit both, when the outdoor unit redirects the 24v to W the indoor unit will give the still powered Y is chosen for blower speed.
Awesome. Thanks for all the helpful information.
Can you do a unico system with Bosch hp
Yes it will function fine, Unico had AHRI matches in the past but may no longer have ratings if your looking for rebates. You would still use the Unico Coil.