Skip to main content ↑ ↓
Topic: Hopefully simple AH question (Read 254 times) previous topic - next topic

Hopefully simple AH question

Went out to fire the AH last night...my every 30 day ritual.  Looking at the overflow bottle, the level is about 3/4" below the cold line.  Once fully heated and the burner shut off, the level is right at the hot line.  Ambient temp about 55*F.  Anything I should look at?
Keith
2003 U320 38' #6197

Re: Hopefully simple AH question

Reply #1 –
Mine is all over the map.  Sometimes when cold its way above the cold line and other times it's a bit below.

My AH works great.
2003 U320 40 AGDS Build 6157 161K miles

Hampstead NC

Re: Hopefully simple AH question

Reply #2 –
I have seen the same with my recovery tank when very cold outside before I start it.
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: Hopefully simple AH question

Reply #3 –
Overflow bottle at the HOT line when the burner cycles off is excellent operation.
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas
 

Re: Hopefully simple AH question

Reply #4 –
AH works like any closed loop radiator system.

In a cooling system with a radiator cap and separate overflow tank, the coolant can flow both ways. Hot boiler temperatures cause coolant to expand from the radiator into the overflow tank through their connecting tube. When the boiler cools again, the coolant level drops in the boiler so it draws liquid back in from the overflow tank.

Unless you have a slow leak somewhere, When hot and running should always be around the same Hot height in the tank, and when cool around the same height for cold.
Mike in AL
2001 U295
8.3 ISC 350
Build 5918