beautypg.com

Recirculation system 2 – Watts LFN170 CSUT User Manual

Page 4

background image

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: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com

Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • 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

This manual is related to the following products: