OK, can you post a close up photo of the Drayton data label, we will then see, once and for all, what way the 3 ports are positioned.
You said the "TheGrundfos pump arrow on the front is pointing anticlockwise so is pumping up." can you post a photo of this, the arrow is normally on the side of the pump body and points either straight up or straight down. Sometimes, rarely, there may not be a arrow but if you look at the black asterisk I have placed in both photos below, you can determine from the ridge/bulb on the pump body which direction its pumping in as the start of the ridge will be closer to the pump inlet.
Can discuss the excessive air later depending on findings, above.
You said the "TheGrundfos pump arrow on the front is pointing anticlockwise so is pumping up." can you post a photo of this, the arrow is normally on the side of the pump body and points either straight up or straight down. Sometimes, rarely, there may not be a arrow but if you look at the black asterisk I have placed in both photos below, you can determine from the ridge/bulb on the pump body which direction its pumping in as the start of the ridge will be closer to the pump inlet.
Can discuss the excessive air later depending on findings, above.
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