Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
Weil McLain ultra fault indirect Domestic hot water
Hort
Member Posts: 5
in Gas Heating
Recently I have noticed that during most calls for domestic indirect hot water heating that the return temperature is a few degrees hotter than the supply temperature and I get a lockout that automatically resets itself in time.
I have a post pump time set for 20 sec. but there does not seem to be a pre-pump time to set that may keep this from happening. This is DHW priority 1.
This is a recently new situation but has occurred during the heating season and now during warm weather shut down for house heat. Weil Mclain Ultra 105 series 3
Any thoughts?
Max supply 160.
mod on diff 2
mod off diff 10
Max rate 94%
Min rate 20%
Lockout usually occurs during first call for hot water in early morning
I have a post pump time set for 20 sec. but there does not seem to be a pre-pump time to set that may keep this from happening. This is DHW priority 1.
This is a recently new situation but has occurred during the heating season and now during warm weather shut down for house heat. Weil Mclain Ultra 105 series 3
Any thoughts?
Max supply 160.
mod on diff 2
mod off diff 10
Max rate 94%
Min rate 20%
Lockout usually occurs during first call for hot water in early morning
0
Comments
-
Sounds like you have a flow issue. Check the circulator that it’s running and if so make sure there isn’t any debris stuck on the impeller.0
-
It may also be one a faulty supply or return sensor, perhaps its seeing a temperature differential that is too large but its not real. Test the sensors with an ohms sensor.Tom
Montpelier Vt0 -
Thank you both for your response and I will check both. To test the sensors is it best to test both at freezing and boiling?
With the circulator can I disassemble the circulator and use the same gaskets when putting it back together?
I am getting ready to do the annual cleaning so it is good timing to do all at the same time.
Thanks!!!0 -
-
-
Check your high limit setting in the boiler settings menu. It should be at 200f. Then go to the system settings and go to priority 1. Go to temperatures and ensure that the target temp is 175 with a 5f on and off differential. I the DHW piped off of the boiler or off of the header? Be sure that the DHW direct or DHW system selection matches the piping.1
-
Thanks uncle john!!! No zone valve0
Categories
- All Categories
- 86.3K THE MAIN WALL
- 3.1K A-C, Heat Pumps & Refrigeration
- 53 Biomass
- 422 Carbon Monoxide Awareness
- 90 Chimneys & Flues
- 2K Domestic Hot Water
- 5.4K Gas Heating
- 100 Geothermal
- 156 Indoor-Air Quality
- 3.4K Oil Heating
- 63 Pipe Deterioration
- 917 Plumbing
- 6.1K Radiant Heating
- 381 Solar
- 14.9K Strictly Steam
- 3.3K Thermostats and Controls
- 54 Water Quality
- 41 Industry Classes
- 47 Job Opportunities
- 17 Recall Announcements