Lochinvar RPV-S Installation Manual

Series RPV

Residential Purge, Drain and Balance Valve

IS-RPV

Installation Instructions

When first filling the hydronics system or when re fill ing it af ter
per form ing main te nance, you must re move all air from the pip ­ing and the ra di a tion el e ments to fill them with water. Air
trapped in the sys tem can pre vent prop er cir cu la tion of water
and cause noisy op er a tion.

The Watts Residential Purge and Balance Valve (RPV) (Fig. 1)
should be in stalled on the return pip ing of a hydronics heat ing
cir cuit (see back) be fore it joins the re turn main. If the system
comprises mul ti ple zones, each zone should be fitted with the
RPV.

Purging the Hydronics System

1. Isolate all circuits by shutting the isolation or zone valves and
the RPV’s shutoff valves.

2. Starting with one circuit, attach a hose to the purge port of
the RPV shown in (Fig. 2). (Note: a hose must be run into a
suitable floor drain or run to the out side to ac com mo date
purged water.)

3. Open the RPV’s purge port by turning the brass screw
turn, and open the zone valve (Fig.3).

4. Then open the make up water or boiler fill valve’s fast­fill feature. Al low wa ter to flow through the RPV’s purge
port un til the water runs clear and free of air bubbles.

1

⁄4

Fig. 1.

13⁄4" RPV-SM-90

Fig. 2. Cutaway view of Watts RPV

RPV

Shutoff

Fig. 3. Purge/drain valve open

Balance

Port

3

⁄4" RPV-S

Purge/Drain

Valve

5. Close the make up water or boiler fill valve.

6. Next, close the RPV purge port by turning the brass

7. Repeat steps 2 through 6 for each zone.

8. Upon completion of purging all zones of air, open the

1

screw

⁄4 turn un til the water stops flow ing, and shut off

the isolation or zone valve.

RPV shutoff valves (Fig. 4).

Balancing the Hydronics System

When you have filled the entire system with wa ter, you can
open the bal anc ing valve for each cir cuit and ad just it to pro vide
optimum sys tem comfort.

Main Valve Closed

Fig. 4. Normal position

Purge/Drain

Valve Open

Purge/Drain Valve Closed

Cutaway View Hydronic Heating Circuit

Radiation

From Radiation

Watts 2000 Flow Check

To Radiation

Isolation or Zone Valve(s)

Watts

Watts No. 1156F

Boiler Fill Valve

Hot
Water
Boiler

This valve is designed to be soft soldered into lines without dis as­ sem bly, using a low temperature solder (420°F). Other sol ders such
as 95/5 tin antimony (460°F) or 96/4 tin silver (430°F) can be used.
However extreme caution must be used to prevent seal dam age.
Higher temperature solders will dam age the seat ma te ri al. ANSI
B16.18 states that the max i mum operating pres sure of 50-50
solder connections is 200psi at 100°F and de creas es with
higher temperatures.

Apply heat with the flame directed AWAY from the center of the
valve body. Excessive heat can harm the seats. After sol der ing,
the packing nut may have to be tightened.

RPVs

Return

Radiation

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

IS-RPV 1132 EDP#1911295 © 2011 Watts

USA: No. Andover, MA • Tel: [phone] • Fax: [phone] • www.watts.com

Canada: Burlington, ON • Tel: [phone] • Fax: [phone] • www.wattscanada.ca