Indigo
New Member
Hello - had a WM97+ installed this past fall along with its paired AquaLogic DHW indirect heater. Issue I am having is that when transitioning from making dhw to then heating the house (single zone) it is locking out with return water registering as hotter than supply water. This issue seems to mostly occur when it's not all that cold out and the water in the house rads is not all that hot. It will then lockout for a couple minutes and reset itself.
I have increased pre and post pump times on both the house zone and the dhw zone, but that does not seem to have made a difference.
Here's an example from one of the error logs, they are flagged as occurring in "Domestic Mode":
Temperatures:
Boiler Out 1: 118F
Boiler Out 2: 117F
Boiler In: 126F
Flue1: 126F
Flue2: 125F
Outdoor: 44F
CWH Tank Top: 150F
CWH Tank Bottom: 138F
Outputs:
Gas Valve: On
Boiler Circulator: Off
Circulator 1: On
Circ 2: Off
Circ 3: Off
Blower Signal: 25%
Alarm: Off
Inputs:
In1: On
In2: On
In3: Off
Manual Limit: Closed
Auto Limit: Closed
Low Water Cutoff: Closed
Blower Tach: 5340RPM
Flame Signal: 0
From what I've read this seems to be linked to a lack of water circulation - as far as I can tell the plumbing is ok, and matches what's in the manual, though it meanders a bit because the space is tight. Is this a matter of increasing zone 1 circulator speed? It's a 3 speed grundfos, which is in its middle position.
Will bring this to my contractor's attention, but am looking for any other thoughts on this / if anyone's seen this before.
Thanks!
I have increased pre and post pump times on both the house zone and the dhw zone, but that does not seem to have made a difference.
Here's an example from one of the error logs, they are flagged as occurring in "Domestic Mode":
Temperatures:
Boiler Out 1: 118F
Boiler Out 2: 117F
Boiler In: 126F
Flue1: 126F
Flue2: 125F
Outdoor: 44F
CWH Tank Top: 150F
CWH Tank Bottom: 138F
Outputs:
Gas Valve: On
Boiler Circulator: Off
Circulator 1: On
Circ 2: Off
Circ 3: Off
Blower Signal: 25%
Alarm: Off
Inputs:
In1: On
In2: On
In3: Off
Manual Limit: Closed
Auto Limit: Closed
Low Water Cutoff: Closed
Blower Tach: 5340RPM
Flame Signal: 0
From what I've read this seems to be linked to a lack of water circulation - as far as I can tell the plumbing is ok, and matches what's in the manual, though it meanders a bit because the space is tight. Is this a matter of increasing zone 1 circulator speed? It's a 3 speed grundfos, which is in its middle position.
Will bring this to my contractor's attention, but am looking for any other thoughts on this / if anyone's seen this before.
Thanks!