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Models: PLT-5, PLT-12
Potable Hot Water Expansion Tank
IS-PLT
Installation Instructions
Support Tank in Optional
Horizontal Position
Optional Location
Water
Supply
Listed by IAPMO
Optional Location
To System
Watts
T&P Safety
Relief Valve
Expansion
Tank
Discharge Line
Water
Heater
Watts Pressure Gauge
Watts
Backfl ow
Preventer
Acceptance Volume
AIR SIDE PRE-PRESSURE WATER SIDE VOLUME AT 150 (10.3 bar)
(psi) (bar) (gal.) (liter) (gal.) (liter)
PT-5 PT-12
20 (1.4) 1.48 (5.6) 3.42 (12.9)
40 (2.8) 1.26 (4.8) 2.88 (10.9)
60 (4.1) 1.0 (3.8) 2.49 (9.4)
80 (5.5) .80 (3.0) 1.85 (7.0)
Technical Information
DESCRIPTION
PLT-5 ORDER
CODE 0067370
Max. Pressure - psi 150 150
Max. Temp. - °F 200ºF 200ºF
Tank Volume - Gal. 2.1 4.5
Tank Acceptance - Gal. 1.26 1.26
Air Pre-charge - psi 20 20
3
Connections Size - In.
⁄4" Male
Diameter - In. 8 101⁄2
Length - In. 11 13.5
Weight - lbs. 5.5 10.0
PLT-12 ORDER
CODE 0067371
3
⁄4" Male
Floor Drain
WARNING!
!
Improper installation, adjustment, alteration, service or maintenance
can cause property damage, serious bodily injury or death. Read
instructions completely before proceeding with installation. Only
qualified personnel may 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). A maximum instantaneous
pressure in excess of 150psi (10.3 bar) or 200°F (93ºC) is UNSAFE
and can 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 will result in the possibility of 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: We recommend that all thermal expansion and safety relief
products be installed with adequate drainage provisions.
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Optional Location
Support Tank in Optional
Horizontal Position
Optional
Location
Watts Pressure Gauge
Water
Supply
Watts
Backfl ow
Preventer
Expansion
Tank
To System
Watts
T&P Safety
Relief Valve
Discharge Line
Water Heater
Floor Drain
Important!
• A pressure relief valve sized and installed in accordance with
local codes must be incorporated in the 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.
Installation
1. Before beginning installation determine the system pressure.
a. Open a faucet to allow the system pressure to equalize.
b. Close faucet.
c. Read the system pressure at the pressure gauge (Fig. 1)
2. The expansion tank pre-charge must be set to the system
pressure as determined in Step 1. Pre-charge prior to installation in the system.
Caution: Pre-charge prior to installation in the system. 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.
Note: The normal pre-charge is 20psi. Do not exceed 80psi.
If system pressure exceeds 80psi it will be necessary to either:
A. Add a pressure reducing valve to the system or, B. Locate
the expansion tank in a riser where the static 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
using 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 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 Fig. 1).
a. The weight of the expansion tank fi lled with water is sup-
ported by the system piping. Therefore, it is important
that, where appropriate, the piping has suitable bracing
(strapping, hanger, brackets).
b. The expansion tank may be installed vertically (preferred
method) or horizontally. Caution: The tank must be properly supported in horizontal applications.
c. Do not install without adequate drainage provisions.
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 water heater.
9. Open a hot water fi xture to allow a slight fl ow until the hot
water has reached operating temperature.
10. Recheck system pressure following Step 1.a through c.
Caution: Pre-charge prior to installation in the system. 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.
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.
Water Safety & Flow Control Products
IS-PLT 0910 EDP# 1915356
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
© Watts, 2009
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