Hot water from cold pipes, 4 out of 6 floors - Plumbing Zone

doms · 08-11-2010, 01:34 PM

Ok, I have a six story building we service that has hot water coming from the cold side of faucets and urinals on 4 out of six floors. 5-6th floors are fine. Toilets somehow are not affected. This is from what i can see through access hatches, a standard plumbing layout. Water heater is 100 gallon on roof with resurc. Found one faucet with a bad cartridge which I replaced with no change to problem. Unable to locate any thermostatic mixing valves. The building has a pump station in the basement for pressure to all the floors, there pump guy had come out and fixed a cooling valve that feeds cool water to the pumps that prevents overheating? This thing has me stumped, without finding a bad mixing valve or mop sink left on what's left?

PLUMBER_BILL · 08-11-2010, 01:51 PM

Quote:

Originally Posted by doms

Ok, I have a six story building we service that has hot water coming from the cold side of faucets and urinals on 4 out of six floors. 5-6th floors are fine. Toilets somehow are not affected. This is from what i can see through access hatches, a standard plumbing layout. Water heater is 100 gallon on roof with resurc. Found one faucet with a bad cartridge which I replaced with no change to problem. Unable to locate any thermostatic mixing valves. The building has a pump station in the basement for pressure to all the floors, there pump guy had come out and fixed a cooling valve that feeds cool water to the pumps that prevents overheating? This thing has me stumped, without finding a bad mixing valve or mop sink left on what's left?

Lets think ouside the box ... You said in your post that "their pump guy had come out and fixed a cooling valve that feeds cool water to the pumps that prevents overheating?" Did this problem exsist before he came out? (Y/N) If the answer was N then
I just wonder what valves he shut or what be opened?

OldSchool · 08-11-2010, 03:27 PM

I would say to call a local plumber

Tommy plumber · 08-11-2010, 04:55 PM

Doms- a licensed plumbing contractor is what you listed in your bio. I would think your expertise as a plumber would include basic troubleshooting skills. It's obvious there's a cross-connection....you'll need to find it. I have a hunch that you aren't who you say you are...you write about a "standard plumbing layout." That phrase tells me something's not quite right. That's a layman's term.

CSINEV · 08-11-2010, 07:49 PM

OK so your a plumber or maybe your not. I dunno

But most times there is a service sink on each floor and the cleaning people hook-up a soap dispensing system to it and they leave the hot and cold levers on the faucet turned on because the soap dispensing unit has its own valve. This is your cross connection for each floor and why it's not on every floor.

If your a real plumber, I hope this helps. If your not, that will be $100.00 please.

Ron · 08-12-2010, 02:02 AM

I did a job like this once and fixed it.

PlungerJockey · 08-12-2010, 02:03 AM

Quote:

Originally Posted by CSINEV

OK so your a plumber or maybe your not. I dunno

But most times there is a service sink on each floor and the cleaning people hook-up a soap dispensing system to it and they leave the hot and cold levers on the faucet turned on because the soap dispensing unit has its own valve. This is your cross connection for each floor and why it's not on every floor.

If your a real plumber, I hope this helps. If your not, that will be $100.00 please.

^ This ^

I would also look for a mop sink that has one of those cute shut offs on the hose bib. Most of the time the faucet is left on and the diverter is off and it allows the water to mix.

Plumberologist · 08-21-2010, 07:35 PM

Quote:

Originally Posted by Ron

I did a job like this once and fixed it.

me too me too

ROCKSTARPLUMBER · 08-21-2010, 09:00 PM

4 out of 6 floors? I had this problem on 6 out of 8 floors, but never 4 out of 6. You sure the building is only 6 floors. I am so confused.

plumber666 · 10-02-2010, 11:36 AM

Quote:

Originally Posted by CSINEV

OK so your a plumber or maybe your not. I dunno

But most times there is a service sink on each floor and the cleaning people hook-up a soap dispensing system to it and they leave the hot and cold levers on the faucet turned on because the soap dispensing unit has its own valve. This is your cross connection for each floor and why it's not on every floor.

If your a real plumber, I hope this helps. If your not, that will be $100.00 please.

Seen this oodles of times. Threads been around a while, get 'er fixed?

08-11-2010, 01:34 PM	#1
doms Junior Member Join Date: Jan 2009 Posts: 1 My Photos	Hot water from cold pipes, 4 out of 6 floors Ok, I have a six story building we service that has hot water coming from the cold side of faucets and urinals on 4 out of six floors. 5-6th floors are fine. Toilets somehow are not affected. This is from what i can see through access hatches, a standard plumbing layout. Water heater is 100 gallon on roof with resurc. Found one faucet with a bad cartridge which I replaced with no change to problem. Unable to locate any thermostatic mixing valves. The building has a pump station in the basement for pressure to all the floors, there pump guy had come out and fixed a cooling valve that feeds cool water to the pumps that prevents overheating? This thing has me stumped, without finding a bad mixing valve or mop sink left on what's left?

08-11-2010, 04:55 PM	#4
Tommy plumber Senior Member Join Date: Feb 2010 Location: South Florida Posts: 4,145 My Photos	Doms- a licensed plumbing contractor is what you listed in your bio. I would think your expertise as a plumber would include basic troubleshooting skills. It's obvious there's a cross-connection....you'll need to find it. I have a hunch that you aren't who you say you are...you write about a "standard plumbing layout." That phrase tells me something's not quite right. That's a layman's term. __________________ Hire a licensed master plumber.

08-11-2010, 07:49 PM	#5
CSINEV Vegas Plumber Join Date: Aug 2010 Location: North Las Vegas, NV Posts: 100 My Photos	OK so your a plumber or maybe your not. I dunno But most times there is a service sink on each floor and the cleaning people hook-up a soap dispensing system to it and they leave the hot and cold levers on the faucet turned on because the soap dispensing unit has its own valve. This is your cross connection for each floor and why it's not on every floor. If your a real plumber, I hope this helps. If your not, that will be $100.00 please. __________________ *I love my God, my Country, and my Constitution.* GIVE IT BACK!! www.csinev.com

08-12-2010, 02:02 AM	#6
Ron Senior Member Join Date: Jun 2008 Posts: 8,635 My Photos	I did a job like this once and fixed it. __________________ Stephen Hawking: If the government is covering up knowledge of Aliens, they are doing a better job of it then they do at anything else.

08-21-2010, 09:00 PM	#9
ROCKSTARPLUMBER I aint CPV see in it? Join Date: Dec 2008 Location: Tallahassee Fl Posts: 4,647 My Photos	4 out of 6 floors? I had this problem on 6 out of 8 floors, but never 4 out of 6. You sure the building is only 6 floors. I am so confused. __________________ My Name Is Rockstarplumber, and I Am Second. Tallahassee Plumber Tallahassee Water line repair Tallahassee Tankless Water Heater Plumber Killearn Lakes Service Repair

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