Install Instructions

IMPORTANT: Valve must be installed
trapped as shown. (See reverse side for rec-
ommended minimum gpm flow requirements.)
The sketch illustrates a two-temperature (180°F
and 140°F) hot water supply system with
a Series N170-M3 and LFN170-M3 valve
and recirculating line for maintaining approxi-
mate fixture water temperatures in the mains.
Because very little hot water is required to main-
tain the low temperature in the mains (usually
140°F), a relatively small capacity recirculator
can generally be specified. The minimum flow
requirements must be maintained between 3-7
gpm. Providing the heat loss from the piping
is not too great (long runs of hot water piping
should be insulated) standard circulators are
usually adequate. However, each installation
should be evaluated for its own recirculation
requirements of gpm and pipe resistance.
NOTE: Recirculating control aquastat must
be set at least 5°F to 10°F lower than the
temperature setting of the Series N170-M3 or
LFN170-M3 valve, otherwise the recirculator will
run continually. Aquastat must be used to main-
tain water to fixtures at a desired temperature
and to eliminate temperature override during no
draw periods.
† Valves listed to ASSE Standard 1016, 1069 or
1070 such as the Watts L111, LFL111, USG,
LFUSG, MMV or LFMMV should be used at
point of delivery.
Series N170-M3 and LFN170-M3
Hot Water Master Tempering Valves Continued
Installation Instructions for
A Two Temperature Recirculating Hot Water Supply System
Typical Two Temperature System with High
Temperature Hot Water Recirculation Line
Aquastat
Aquastat
Circulator
Circulator
Hot Water Return
Tempered Water 140°
Shut
Off
Valve
Water
Heater
or Boiler
Drain Tube
WATTS CSA/ASME
Temperature &
Pressure Relief Valve
High
Temperature
Hot Water
WATTS
Check
Valves
Watts
Series
N170-M3†
WATTS Series 600
Check Valves
8”-12”
HeatTrap†
MMV
Cold Water Supply
Note: Water Heaters may be direct or indirect fired.
Thermometer
To Fixture
Cold Water Supply
Recirculation System 2
To MMV, LFMMV,
USG, LFUSG, L111
or LFL111 then to
fixtures
WATTS Check
Valve
IS-N170-M3 1209 EDP# 2915044 © 2012 Watts
USA: Tel: [phone] • Fax: [phone] • www.watts.com
Canada: Tel: [phone] • Fax: [phone] • www.wattscanada.ca
Limited Warranty: Watts Regulator Co. (the “Company”) warrants each product to be free from defects in material and workmanship under normal usage for a period of one year from the date of
original shipment. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition the product without charge.
THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER
WARRANTIES, EXPRESS OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company shall not be responsible for any incidental, special
or consequential damages, including without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not work properly, other costs resulting
from labor charges, delays, vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the Company has no
control. This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product.
Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of incidental or consequential damages. Therefore the above
limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult applicable state laws to
determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL SHIPMENT.
A Watts Water Technologies Company