Watts LFN170 CSUT - Manual

S-FAQ-N170-M3
Frequently Asked Questions
What is the BIG difference
between the N170-M3
and the M2?
The Model N170-M3 is a complete-
ly redesigned valve, inside and out.
The primary performance difference
between the N170-M2 and N170-M3 is
the M3 is now listed to ASSE 1017-2003,
“Temperature Activated Mixing Valves
for Hot Water Distribution Systems”, as
well as CSA B125.3 through IAPMO.
Where can I find the ASSE
1017 listing?
Go to the American Society of Sanitary
Engineers’ website. The direct link is
http://www.asse-plumbing.org/Seal/
1017.html. You’ll find the listing under
Watts Regulator.
What about my custom-
ers’ installed base?
Can I directly replace
the M3 for the M2 or will
they have to repipe?
The M3 has the identical rough-in dimen-
sions as the M2 and is available in the
exact same sizes (3/4", 1", 1-1/4", 1-1/2",
2"). There is no need to repipe. Simply
swap one for the other.
Does this mean Watts will
no longer offer the M2?
Yes, we will only offer the M3 moving
forward.
What about repair kits for
the M2, will they still be
available?
Absolutely. We’ll continue to offer repair
kits well into the future.
For new installations
on ASSE 1017
applications, we will
require checkstops.
How will this be
handled?
N170-M3s can be ordered
with and without check-
stops. We’ve created two
sets of part numbers for
new and for replacement instal-
lations.
Is it true we’ve
consolidated
two temperature
ranges/models
into one?
Yes, across all sizes. The new
M3 valves operate over a broader
temperature range from 90 – 180°F (32 –
82°C). See our M2 to M3 cross reference
sheet for more information.
What about the “HT” mod-
els with the Teflon ® disc?
We’ve also been successful consolidat-
ing the HT models into our standard
product offering. The Polysulfone inter-
nals have a high temperature deflection
coefficient, as well as being corrosion
resistant.
Does the M3 feature two
paraffin thermostats like
the M2?
No. The M3 uses a single thermostat per
valve. This simplifies the operation of the
valve, improves overall performance and
reduces maintenance and repair costs.
How close can the M3’s
mixed outlet temperature
get to the hot water sup-
ply temperature?
The “Approach Temperature” or
“Minimum Temperature Differential” of
the M3 is only 5°F (3°C). This is ideal
for installations where lower tempera-
ture hot water is being generated at the
boiler.
N170-M3
N170-M3 CSUT
N170-M3
S-FAQ-N170-M3 0912 © 2009 Watts
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca A Watts Water Technologies Company
Teflon ® is a registered trademark of the E.I. Dupont
de Nemours & Company.