Watts PLT User Manual

Potable Hot Water Expansion Tank

Installation Instructions Model PLT-35

IS-PLT-35

Figure 1

Water Heater

Water Supply

Watts Shutoff Valve

Watts Backﬂ ow Preventer

Watts Pressure Reducing Valve

Expansion

Tank

Water Pressure Gauge

Pressure — Temperature

PLT-35 Order No. 0067373

Max. Pressure: 50psi (10.3 bar)

Max. Temp: 200 °F (93ºC)

Tank Volume: 14.0 gal. (53 liters)

Tank Acceptance: 5.6 gal. (21.2 liters)

Air Pre-charge: 20psi (138 kPa)

Connections Size: 1" (25mm)

Diameter: 16.0" (406mm)

Length: 21.7" (551mm)

Weight: 32 lbs. (15 kgs.)

Acceptance Volume

AIR SIDE

PRE-PRESSURE

psi kPa/bar PLT -35

20 138 kPa 10.7 40 276 kPa 9.2 60 413 kPa 7.6 80 551 kPa 6.1

WATER SIDE VOLUME

AT 150 psi (gallons)

To System

Watts T&P Safety Relief Valve

Discharge Line

Certifed to

ANSI/NSF 61

(73°F/23°C)

PLT-35

WARNING!

Improper installation, adjustment, alteration, service or maintenance may cause property damage, serious bodily injury or death. Read instructions completely before proceeding with installation. Only qualified personnel should install or service this equipment in accordance with local codes and ordinances.

This Expansion Tank is designed and intended for water storage at a maximum pressure of 150psi (10.3 bar) and a maximum temperature of 200°F. (93ºC) Any use other than for potable water or at a sustained or instantaneous pressure in excess of 150psi or 200°F is UNSAFE and may cause property damage, serious bodily injury or result in death.

Do not exceed 80psi (5.5 bar) air charge. Air charge pressures exceeding 80psi (5.5 bar) could become hazardous and will void any and all warranties, either written or implied. Failure to follow these instructions may cause property damage, serious bodily injury or death.

Disclaimer: The manufacturer of this tank does not accept any liability or other responsibility for personal injury or property damage resulting from improper use, installation or operation of this tank or the system of which it is a part.

Notice: This Expansion Tank, like all Expansion Tanks, may eventually leak. Do not install without adequate drainage provisions where water flow will cause damage.

Installation

1. Before beginning installation determine the

system pressure.

a. Open a faucet to allow the system pressure to equalize. b. Read the system pressure at the Pressure Gauge

(Figure 1).

c. Close faucet.

2. The Expansion Tank Pre-Charge must be set to the system

pressure as determined in Step 1. Note: The normal pre-charge is 20psi. Do not exceed 80 psi. If system pressure exceeds 80psi, it will be necessary to either: A. Add a pressure Reducing Valve to the system or, B. Locate the pressure is below 80psi.

a. Unscrew the protective cap from the air inlet valve. b. Using a tire pressure gauge check the tank pre-charge

pressure.

c. If necessary, pressurize the tank to the proper setting us-

ing a manual bicycle tire pump. Caution do not

exceed 80psi.

d. Replace the protective air cap.

3. Shut off the water supply valve.

4. Shut off power source to the hot water heater, (electricity,

gas, oil burner switch), and drain system following water heater manufacturer recommendations.

5. Install the Expansion Tank in the System (refer to Figure 1). a. This Expansion Tank, as all Expansion Tanks, may even-

tually leak. Do not install without adequate

drainage provisions.

expansion tank in a riser where the static

Important!

• A Pressure Relief Valve sized and installed in accordance

with Local Codes must be incorporated in the system. In those systems requiring a combined Temperature and Pressure Safety Relief Valve, the Temperature and Pressure Safety Relief Valve should be sized and installed in accordance with Local Codes.

• Never plug a Safety Relief Valve.

6. Turn on the water supply valve.

7. Open a hot water ﬁ xture and allow water ﬂ ow until

all air is removed from the system.

8. Reapply power to the hot water heater.

9. Open a hot water ﬁ xture to allow a slight ﬂ ow until

the hot water has reached operating temperature.

10. Re-check system pressure following Step 1.a through c. Caution: Do not adjust the air pre-charge of the Expansion

Tank with the system under pressure. The air pre-charge should only be adjusted under zero system pressure.

If necessary adjust the Pressure Reducing Valve to the

Expansion Tank Pre-charge as determined in Step 2.

Air Inlet Valve Cap

Figure 1

Expansion

Tank

Watts

Water Supply

Watts Shutoff Valve

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.

Backﬂ ow Preventer

Watts Pressure Reducing Valve

Water Pressure Gauge

To System

Water Heater

Watts T&P Safety Relief Valve

Discharge Line

Note: Product information is subject to change without notice and supersedes all previous publications.

A Watts Water Technologies Company

Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca

USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com