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Tempered water too high at first then goes down

Mr. Inspector

SAWHORSE
Joined
Nov 28, 2009
Messages
4,114
Location
Poconos/eastern PA
I'm failing a final plumbing inspection for a warehouse with offices because the hand sinks water temperature is very high when I first turn each faucet on. My digital thermometer takes about a second to work but reads around 127 F at first then goes down below 110 in a few seconds. If i try it again within a few minutes the temperature doesn't start so high.
What would cause this?
 
Is it an "under-sink on-demand"? If so, they should restrict the flow on the hot side and that may solve it, at least half of it. Those little units don't have a high capacity so high flow rate will cause it not to get hot enough, restricting the flow should help that part, not sure about the too hot at first part. Maybe if they reduce the flow then they can also turn down the temp?
 
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Adjust the temp. down to under 120 degrees,
say around 110 - 115..........
The Code requires
a maximum of 120 degrees, but effectively,
handwashing can be done at a lower temp.
Adding a foaming hand wash to the mix will
produce the cleaning \ sanitizing results desired.


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No it's not an instant water heater under the sink. Their is a 40 gal water heater close by. The water is too hot right away so their must be a loop system.

% + % + %

Adjust the temp. down to under 120 degrees,
say around 110 - 115..........
The Code requires
a maximum of 120 degrees, but effectively,
handwashing can be done at a lower temp.
Adding a foaming hand wash to the mix will
produce the cleaning \ sanitizing results desired.


% + % + %

What section is that in? I don't know of any section that requires 120 degrees. We use the IPC which wants less the 110 degrees for lavatories:

416.5 Tempered water for public hand-washing facilities.
Tempered water shall be delivered from lavatories and group
wash fixtures located in public toilet facilities provided for
customers, patrons and visitors. Tempered water shall be
delivered through an approved water-temperature limiting
device that conforms to ASSE 1070 or CSA B125.3.

2015 IPC Definitions:
TEMPERED WATER. Water having a temperature range
between 85°F (29°C) and 110°F (43°C).

But what is a public hand-washing facility public?

2015 IPC definition:
PUBLIC OR PUBLIC UTILIZATION. In the classification
of plumbing fixtures, “public” applies to fixtures in general
toilet rooms of schools, gymnasiums, hotels, airports, bus
and railroad stations, public buildings, bars, public comfort
stations, office buildings, stadiums, stores, restaurants and
other installations where a number of fixtures are installed so
that their utilization is similarly unrestricted.

These are in a warehouse that has offices (but I would not call it an office building). But customers, patrons and visitors would probably would come in.
Not sure what "and other installations where a number of fixtures are installed so that their utilization is similarly unrestricted" means.

Would you require Tempered water (85-110 degrees) here ?

 
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Yes, I would require tempered water..........I recommend lowering the temp.
setting to
less than 110 degrees..........IMO, having a temp. setting lower
than 110 degrees will meet the needs and intent of
the Code.

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Rick18071 - I am curious. Was there a remedy to this issue?

Me too. Still waiting to reinspect.

Just wondering the code seems to require Tempered water for everyone but employees. What if they are saying that the building is an employee work area would they need tempered water?
 
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