Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 10-09-2012, 08:17 PM   #1
Newbie
 
Join Date: Oct 2012
Posts: 8
Rewards Points: 10
Default

SAFGARD 170SV low water shutoff


My boiler decided to not fire up this morning. I detected 120v to the emergency switch but no power from the SAFGARD low water shutoff. Either the shutoff is faulty or i actually have low water in the heating circuit. I read somewhere where the shutoff sensor s/b cleaned every 5 years. Is this true? How do i determine if there is actually a low water issue or if the sensor is bad?

t_maher is offline   Reply With Quote
Old 10-09-2012, 11:51 PM   #2
Member
 
Join Date: Oct 2011
Location: North Carolina
Posts: 205
Rewards Points: 150
Default

SAFGARD 170SV low water shutoff


The low water cut off should have a sight glass that shows the water level. You can open the blow down pipe/boiler drain and let some water out of the system. Listen to see if new water is entering the boiler.

Patrick Eubanks is offline   Reply With Quote
Old 10-10-2012, 12:32 AM   #3
Member
 
Join Date: Jul 2012
Location: Toronto ON
Posts: 599
Rewards Points: 500
Default

SAFGARD 170SV low water shutoff


There is no sight glass on hot water LWCO's just for steam boilers normally. Hopefully you have isolation valves going to zones..if so then turn them off and drain boiler until no water coming out of relief valve ..that is if relief valve is at top of boiler you can lift the lever to see when water is below that level..then remove sensor probe and clean with steel wool or sand paper..reverse process and try to see if boiler limit is made through LWCO

open valves and start boiler just googled re safgard and they recommend cleaning probe every 5 yrs. on domestic boilers and annually for commercial applications

make sure there is power TO the LWCO first

Can also get air around probe preventing current to ground ( check this by loosening probe allowing any air to escape then re tighten....and also ..the probe can be rendered ineffective if loss of ground where it threads into boiler..this can be caused from too much pipe dope or teflon tape on threads or excessively dirty threads ...usually from corrosion

Last edited by techpappy; 10-10-2012 at 12:49 AM.
techpappy is offline   Reply With Quote
Old 10-10-2012, 05:27 AM   #4
An old Tradesmen
 
Join Date: Oct 2008
Location: PA
Posts: 26,004
Rewards Points: 3,678
Default

SAFGARD 170SV low water shutoff


Does the pressure gauge show any pressure in the boiler.
beenthere is offline   Reply With Quote
Old 10-10-2012, 10:56 AM   #5
Newbie
 
Join Date: Oct 2012
Posts: 8
Rewards Points: 10
Default

SAFGARD 170SV low water shutoff


Quote:
Originally Posted by techpappy View Post
There is no sight glass on hot water LWCO's just for steam boilers normally. Hopefully you have isolation valves going to zones..if so then turn them off and drain boiler until no water coming out of relief valve ..that is if relief valve is at top of boiler you can lift the lever to see when water is below that level..then remove sensor probe and clean with steel wool or sand paper..reverse process and try to see if boiler limit is made through LWCO

open valves and start boiler just googled re safgard and they recommend cleaning probe every 5 yrs. on domestic boilers and annually for commercial applications

make sure there is power TO the LWCO first

Can also get air around probe preventing current to ground ( check this by loosening probe allowing any air to escape then re tighten....and also ..the probe can be rendered ineffective if loss of ground where it threads into boiler..this can be caused from too much pipe dope or teflon tape on threads or excessively dirty threads ...usually from corrosion

Thx for the feedback.

Isolation valve is present. i am pretty sure the water level is ok because my hydroair blows hot when i call for heat.

I can just forgo all the detective work and buy a new unit and install. But i am curious as to what is causing the control to fail. I might buy a new unit anyway AND do the detective work, probe cleaning...etc. I'll keep you posted.

Last edited by t_maher; 10-10-2012 at 01:01 PM.
t_maher is offline   Reply With Quote
Old 10-10-2012, 11:30 AM   #6
Member
 
Join Date: Jul 2012
Location: Toronto ON
Posts: 599
Rewards Points: 500
Default

SAFGARD 170SV low water shutoff


typically the probe just gets dirty thus preventing circuit to ground through the water..clean it and should work

techpappy is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Warm Water out of Cold Water Outlet mb0709 Plumbing 9 08-26-2012 01:59 PM
Solar hot water indatom123 Green Home Improvement 0 12-19-2010 01:01 AM
low hot water pressure angus242 Plumbing 10 01-08-2009 12:41 PM
Testing 12 year old hot water expansion tank? DJfixer Plumbing 2 01-01-2009 09:09 AM
(Water Heater MYSTERY) Hot water out from dead tank with cold water in it? Inayity Plumbing 6 07-14-2008 09:36 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.