mchild
23-10-2010, 02:28 PM
I have a VRVII-S that during heating operation will periodically stop one fan and drop the speed rather low on the second fan of the outdoor unit. This lasts for only a short bit – maybe 30-60 seconds and then both fans ramp back up to full speed. Indoor units continue to operate with blowers running during these periods. This can happen as frequently as 5 - 7 minutes. No fault codes are showing.
In reviewing the service manual, it states that if the high side pressure is greater that 454psi the fans will drop from Step 8 (both fans at full RPM) to step 1 where one fan stops and the second fan drops to 250 RPM. Is it reasonable to assume that is the operation I am observing and is it an issue that it happens as frequently as 5 minutes apart? Is this a normal part of the heating operation?
Thank you.
In reviewing the service manual, it states that if the high side pressure is greater that 454psi the fans will drop from Step 8 (both fans at full RPM) to step 1 where one fan stops and the second fan drops to 250 RPM. Is it reasonable to assume that is the operation I am observing and is it an issue that it happens as frequently as 5 minutes apart? Is this a normal part of the heating operation?
Thank you.