Low water cutoff slow drain test - Section VI vs Section VII
Low water cutoff slow drain test - Section VI vs Section VII
(OP)
Hey guys,
I have a question concerning the low water cutoff switch maintenance practices suggested in these two sections. We run 2 fire tubes boilers and one water tubes boilers.
Section VI - Care for Heating Boilers:
- Suggested that a slow drain test should be performed. (slow drain = draining the boiler level down to the low water cutoff switch set point (2'' over tubes))
Section VII - Care for Power Boilers:
- Slow drain test aren't suggested.
Q: Why are slow drain tests suggested for Heating Boilers and not Power Boilers?
Is there any risk associated to a slow drain test with Power Boilers?
Thank you
Have a nice day
I have a question concerning the low water cutoff switch maintenance practices suggested in these two sections. We run 2 fire tubes boilers and one water tubes boilers.
Section VI - Care for Heating Boilers:
- Suggested that a slow drain test should be performed. (slow drain = draining the boiler level down to the low water cutoff switch set point (2'' over tubes))
Section VII - Care for Power Boilers:
- Slow drain test aren't suggested.
Q: Why are slow drain tests suggested for Heating Boilers and not Power Boilers?
Is there any risk associated to a slow drain test with Power Boilers?
Thank you
Have a nice day





RE: Low water cutoff slow drain test - Section VI vs Section VII
Most heating boilers are not blown down daily, and their operation is passive: closed loop. By slowly draining the boiler prevents upsetting the steam release.
RE: Low water cutoff slow drain test - Section VI vs Section VII
RE: Low water cutoff slow drain test - Section VI vs Section VII
cjw81- Heating Boilers < 15 psig
Power Boilers > 15 psig
RE: Low water cutoff slow drain test - Section VI vs Section VII
RE: Low water cutoff slow drain test - Section VI vs Section VII
Doesn't code require these to be performed at least once a year?
LWFCO's shouldn't fail with a "slow" type of bleed down....think I'd be calling the manufacture if that became a problem.
Jmcx1969, what style/model LWCO were you using?