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Product DataWPA Series

Tank Accept. Approx.Model Volume Volume Ship Wt.

Number Gallons Gallons A B Lbs.

WPA-030 8 5 14 22 90WPA-042 12 5 14 27 105WPA-084 26 12 16 41 150WPA-130 35 19 16 52 200

WPA-170 46 24 16 64 240WPA-215 58 34 20 54 250WPA-254 68 34 20 62 280WPA-300 82 43 24 55 300WPA-350 100 43 24 65 330WPA-425 115 61 24 72 380WPA-500 137 61 24 83 425

WFA SeriesTank & Approx.

Model Accept. Ship Wt.Number Vol./Gal. A B Lbs.

WFA-140 36 20 391 / 2 195

WFA-215 57 20 54 290WFA-300 82 24 571 / 8 320WFA-450 120 24 783 / 8 400WFA-600 165 30 693 / 4 460WFA-800 220 30 881 / 4 590WFA-1000 271 36 793 / 4 790WFA-1200 324 36 913 / 4 940WFA-1400 377 36 104 1020WFA-1600 440 48 781 / 8 1380WFA-2000 550 48 901 / 8 1650

Technical BulletinWPA/WFA 8

B

Lifting RingCharging Valve.302-32NC

Charging Valve.302-32NC

LiftingRing

LiftingRing

1-1 / 2 Inlet

1 / 2 InletLifting Ring

AA

B

Operation TheoryThe Wheatley Bag Type Expansion Tanks contain a flexible bladdwhich separates the water from the air cushion in the tank. The tamay be precharged to the minimum preasure of the system. Uponoperation of the system, the water expands due to heating and begto fill the felxible bladder in the tank. As the bladder fills with wthe air cushion is compressed causing a rise in pressure in thesystem. Through proper sizing of the expansion tank, this pressu

increase is controlled and kept within the accepted range of thesystem. The inclusion of the bladder in the expansion tank as abarrier between the air and water prevents any loss of precharge dto absorption.

Installation and Start-up Procedure1. Inspect tank for damage which may have occured during shipp2. Bladder Type Tanks are shipped with a factory precharge of 12psig. Check precharge using an accurate pressure gauge at thecharging valve. Pressure should be within +3 lbs. depending on tambient temperature.3. If any damage exists or precharge is not acceptable, contactWheatley immediately.DO NOT INSTALL UNIT.4. To install tank, set unit in place and connect system piping tosystem connection on tank.DO NOT REMOVE BOTTOM PLUG LOOSEN NUT ON COVER PLATE.Bottom plug and cover plate arto be removed only in case of bladder failure. Removing bottom or loosening cover plate nut will result in loss of factory prechargvoids warranty.5. Units must be charged to minimum system precharge up to 40 before system is filled with water. All systems over 40 PSI shoulfilled by adding 1/4 bladder volume of water before charging ovepsig to the desired PSI working pressure. Any alteration in factor

precharge should be completed just prior to filling the system witwater.6. Leak check all connections including cover plate seal during adjustment of precharge and initial operation of unit.7. When filling system with water, any values in line leading to tmust be open to insure that any trapped air in tank is displaced bywater. Be sure to follow manufacturers startup procedures for otcomponents in the system.

WPA Series WFA Series

WPA and WFA SeriesBladder Type Expansion Tank Sizing& Operating Instructions

Maximum design pressure 125 PSI.Maximum design temperature 240F

Maximum design pressure 125 PSI.Maximum design temperature 240F

www.wheatleyhvac.com e-mail: sales@globalflowproducts .comTol l Free: 866-204-5229 PH: 918-317-0401 FAX: 918-317-0407

1005 E. Houst on, Bro ken Arr ow, OK 74012

8/9/2019 Exp Tank Design

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1 -P1 + 14.7

Po + 14.7

Sizing ProcedureJob:1. Enter Total System Water Content _________________________ gal.2. a. Enter Minimum System Temperature _________________________ F

b. Enter Maximum System Temperature _________________________ Fc. Enter Expansion Factor From Table 1 _________________________ gal.

3. Calculate Expanded Water Volume(Multiply line by line 2c)

4. a. Enter Minimum System Pressure (P1) _________________________ psig

b. Enter maximum System Pressure (Po) _________________________ psigc. Enter acceptance Factor From Table 2

5. Calculate Total Tank Volume Required _________________________ gal.(Divide line 3 by line 4c)

6. Select Tank from Product Data Table--Side 1 Model ____________________Note: When using WPA Tanks, amount of expanded water generated (Line 3) must not exceed acceptance volume of tank.

Table 1 - Net Expansion of Water

Table 2 - Acceptance Factors Note: If pressures exceed tablesuse formula

to obtainfactor