I've narrowed down the pump noises I'm experiencing to being exclusively related to heating the hot water tank.
I used have an overlap of heating hot water and central heating but I've since separated the timings and it seems better this way but I noticed it's the hot water is the cause of what sounds like cavitation, fizzing etc through the pump.
It's a grundfos 15-60, latest type on speed 1 which is working perfectly. Central heating is quiet and heats perfectly. Boiler is ideal classic ff380 think its a 23kW output. Unvented megaflo CL210.
I noticed the tundish was showing a light stream of water so I replenished the air gap and this stopped. I checked the temp comtrols and both cyclinder and immersion are set to 60c.
I just don't know why it seems to be really noisy. I've bled the pump and unscrewed the cap on the return. It's a screw down metal type with no auto vent on the HW return although their is an auto air vent on the flow. I assume this is normal so it doesn't suck in air. I've tapped and bled the other.
If I try the pump on proportional pressure mappings I still seem to get the fizzing cavitation problem and then the central heating short cycles on PP mappings. I'm just surprised as I didn't think a pump speed of 1 would create enough rotational speed to create cavitation. So Im stumped as to what it is.
Any ideas?
Thank you
I used have an overlap of heating hot water and central heating but I've since separated the timings and it seems better this way but I noticed it's the hot water is the cause of what sounds like cavitation, fizzing etc through the pump.
It's a grundfos 15-60, latest type on speed 1 which is working perfectly. Central heating is quiet and heats perfectly. Boiler is ideal classic ff380 think its a 23kW output. Unvented megaflo CL210.
I noticed the tundish was showing a light stream of water so I replenished the air gap and this stopped. I checked the temp comtrols and both cyclinder and immersion are set to 60c.
I just don't know why it seems to be really noisy. I've bled the pump and unscrewed the cap on the return. It's a screw down metal type with no auto vent on the HW return although their is an auto air vent on the flow. I assume this is normal so it doesn't suck in air. I've tapped and bled the other.
If I try the pump on proportional pressure mappings I still seem to get the fizzing cavitation problem and then the central heating short cycles on PP mappings. I'm just surprised as I didn't think a pump speed of 1 would create enough rotational speed to create cavitation. So Im stumped as to what it is.
Any ideas?
Thank you
