CA Expansion Tanks

Air Elimination & Control

CA Expansion Tanks

Taco CA Expansion tanks are full acceptance Captive Air expansion tanks that provide separation of air and water. Tough, durable and long lasting. The Taco CA is available in a variety of sizes and capacities to fit your application.

©Taco Catalog #400-1.2 Effective Date: 12/01/14 Supersedes: 07/31/14 Printed in USA Features & benefits

Eliminate Pressure For applications CA Specifications: and Flow problems: requiring NSF/ANSI 61-G • Shell — Fabricated Steel • Better comfort. Eliminate Cerification Designed and Constructed flow problems. Our CA Model and PAX model per ASME Section VIII Div. 1 expansion tanks are available • Eliminate water logged with an option for NSF/ANSI 61-G • Bladder — Field Removable expansion tanks Certification. This can be requested • Reduce expansion tank sizes by adding a “P”to the end of a CA NSF/ANSI 61-G [ P] Option, Example: P/N PAX30-150P) up to 80%. or PAX type expansion tank model number. (Example: CA140-125P) Models certified to NSF 61-G are • Eliminate expansion tank required to be installed on the cold water side of the hot water heater. corrosion problems. Increase Reliability and • Reduce problems with Reduce Maintenance Costs Standard Optional burst bladders. • Full Acceptance bladders Working 125 PSIG 150 PSIG Pressure: (862 KPA) (1034 KPA) eliminate burst bladders 175 PSIG Dramatically Reduce (1206 KPA) Expansion Tank Sizes • Eliminate tank corrosion by isolating water from tank 250 PSIG Captive Air expansion tanks (1723 KPA) eliminate the many gallons of 300 PSIG water required to compress (2068 KPA) atmospheric pressure air in an Operating 240˚F Consult air cushion plain steel tank to Temperature: (116C) Factory the fill pressure. This allows a reduction in Captive Air expansion tank sizes of up to 80% compared to air cushion plain steel tanks.

-2- Applications

Air Control Through Water contains a certain amount can be dissolved or entrained. For Pressure Control of entrained air. If this air comes example at 100˚F and 80 PSIA water All hydronic systems operate under out of solution at lower pressures, can contain 8% air by volume. At a variable amount of pressure. For it can increase corrosion rates of 100˚F and 20 PSIA the percentage closed systems the pressure varies metals within the system. In addi- decreases to 2%. primarily due to the expansion of tion, air can form pockets at the water as it is heated or cooled. As top of pipes and coils of terminal The conclusion is that air is least the water is heated the pressure units. These air pockets can actually soluble in water at lowest pressure. increases and as the water is cooled restrict or block flow in a hydronic Air separators should therefore be the pressure decreases. piping system. This is referred to as located at these points. “air locking”. The lowest pressure in a system The pressure in a closed system var- is typically at the expansion tank, ies between a minimum and a max- Figure 1 shows a solubility curve since this is the point of no pressure imum. The minimum is controlled for air in water. Note that at a fixed change and the location of the fill by the fill valve and the initial fill temperature reducing the pres- valve. Therefore, the general rule of pressure of the expansion tank. The sure reduces the amount of air that thumb in hydronic systems is that maximum pressure is determined “Air separators should be 18% located at the expansion tank by the relief valve and the size of 16% SOLUBILITY OF AIR IN WATER AT STANDARD the expansion tank allowing the 14% TEMPERATURE AND PRESSURE connection to the system.” water to expand into the tank. 12% 10%

6% 90 If the pressure is not maintained 80 70 4% 60 50 between these limits then the sys- 40 PSIA 2% 30 20 tem will not perform properly. 10 32 50 75 100 125 150 175 200 212 Not maintaining minimum pres- TEMPERATURE (DEGREE F) sures will create air problems. Figure 1

FAN COIL

TACO CIRCULATOR

TACO TWIN TEE

TACO AIR SEPARATOR

TACO PUMP

TACO TACO SUCTION MULTI-PURPOSE TACO DIFFUSER VALVE EXPANSION TANK

BOILER Figure 2 – Boiler and Expansion Tank/Air Separator Location

-3- Applications

FAN COIL

TACO CIRCULATOR

TACO TWIN TEE

TACO 4900 AIR SEPARATOR

TACO PUMP

TACO TACO SUCTION MULTI-PURPOSE DIFFUSER VALVE TACO EXPANSION TANK

CHILLER Figure 3 – Chiller and Expansion Tank/Air Separator Location

For multi-story buildings this is solubility of air in water at this pres- is to install additional air separators important. If the system pressure is sure and 40˚F is 45%. At the top of at upper levels of the building. A not maintained above atmospheric the building, assuming, 10 psi posi- hydronic system can have multiple at the top of the building then not tive pressure, the solubility is only air separators, but should have only only will air come out of solution, 4%. one expansion tank. These air sepa- but air can actually be drawn into rators should be high efficiency sep- the system. This will result in loss of Obviously air will come out of solu- arators similar to Taco’s 4900. See system performance with areas of tion at the top of the building with Taco Catalog #400-1.4 for additional low and no flow in this portion of the expansion tank and air separa- information. the system. tor located at the bottom. By “over pumping”, to maintain 40 psi at the Another solution is to locate the For high rise buildings this is espe- top of the building, the solubility of expansion tank and air separator at cially important. Frequently the air goes back up to 10%. the top of the building where the expansion tank, air separator and pressure is the lowest and the air fill valve are located at lower levels For pumps located at upper levels of the building this is even more is least soluble in water. This will of the building. At upper levels air require the running of a dedicated will come out of solution as the problematic. Pumps in these locations can actually be attempting to line from the top of the building to pressure decreases. This is similar the suction of the system circulat- to what divers experience as the pump air. For centrifugal pumps the point at which their head falls off is ing pump. This will also reduce the “bends”. One solution, which size of the expansion tank since the designers and maintenance per- in the range of 3% to 5% air volume in water. difference between the initial fill or sonnel learned over time, was to minimum pressure and relief valve “over pump” the system through Maintenance personnel and field or maximum pressure can be larger. high pump heads. This increased engineers report many instance of the pressure at upper levels of the poor pump performance due to Not maintaining maximum pres- building and forced air back into unknown causes. A large portion sure can result in several problems, the system. of these mysterious problems have including burst diaphragm or bladders in partial expansion captive For example, in a 50 story building, turned out to be secondary pumps located above expansion tanks. air tanks, weeping relief valves and the static pressure at the bottom failure of components of the system could be 250 psi. The A better solution to “over pumping” -4- Applications

Causes of over system pressuriza- The tank must now be sized for the This permanent separation allows the tion can be undersized expansion initial fill volume plus the volume of tank to be precharged on the air side tanks, water logged air cushion any expanded water. This makes the of the bladder to the minimum oper- plain steel expansion tanks and tank much larger. ating or fill pressure. This eliminates burst diaphragms or bladders in the initial water volume needed to As air is released through air vents, Captive Air tanks. compress the air from atmospheric the air cushion in the tank can be pressure to the system minimum absorbed into the system fluid leav- Pressure Control (fill) pressure. This allows the bladder ing the tank water logged and elimi- Through Air Control expansion tank to be charged to the nating the system pressure control Many systems designed in the past fill pressure without the introduc- provided by the plain steel tank. and some designed today, attempt to tion of system fluid offering a sizable When this occurs the expanded water control air by means of an old style air reduction in the required tank volume volume must now seek a new outlet cushion plain steel tank and air vents (see figure 5 A). The use of a Captive which is normally the relief valve or in the piping. Air expansion tank often allows the thru the rupture of one of the other reduction in required tank sizes up to system componets. The air cushion plain steel tank uses a 80% compared to air cushion or plain tank filled with water and an air cush- A better solution is to use a Captive steel tanks. ion at the top of the tank for water to Air tank. In a Captive Air tank the air During system operation any expanded expand into as it is heated. The initial is held captive by the use of a blad- water, in the diaphragm or bladder, atmospheric air in the tank must be der or diaphragm with the expanded compresses the precharge air to the initially compressed to the fill pres- water being held on one side of the maximum pressure. This compressed sure. This requires an initial charge diaphragm or bladder and the air on air cushion then pushes the fluid back or fill of water to accomplish this as the other side. into the system when it contracts. shown in Figure 4.

A. Empty Tank Pa A. After system B. At operating pressure has been lled P Boiler in operation P Atmospheric 1 o Pressure Tank Empty

B. After system has been lled P1 Air Cushion at Min. Expanded Operating Pressure P1 Water

Initial Water Fill Pre-pressurized air cushion Pre-pressurized air cushion at at minimum operating pressure. maximum operating pressure. (Bladder in collapsed condition) (Bladder accommodating expansion volume) C. At operating pressure Po

Figure 5 – Captive Air pressurization process Initial Water Fill Remains Constant Expanded Water Vol Air Cushion at Max. Operating Pressure Boiler in Operation

Figure 4 -4- Plain steel pressurization process -5- Applications

This can be seen in the following System fill pressure of 10 psig, This is a difference of greater than example problem. System volume of 3000 gallons, 81% reduction in required tank size System: Chilled water at 40˚F with steel piping system, System System volume: 3000 gallons fill pressure of 65 psig and a 90 psig Another advantage of the perma- System piping : Steel maxiumum operating pressure. nent separation of air and water in a Captive Air tank is to eliminate The ASHRAE formula for plain steel Sizing a plain steel expansion tank the absorption of air back into the expansion tank sizing is: t [(v2/ v1) – 1] – 3aΔ water that is found in air cushion or Vt = Vs plain steel tanks. [(v2/ v1) – 1] – 3aΔt (Pa/ P1) – (Pa/ P2) Vt = Vs (P / P ) – (P / P ) Location of a 1 a 2 For Expansion Tank Where Location of the expansion tank in Vs = 3000 gallons v = volume of expansion tank, gal 3 the system will also affect system t v1 = .01602 ft /lb (40˚F) v = .01613 ft3/lb (100˚F) performance. vs = volume of water in system, gal 2 P = 14.7 psia t = lower temperature, ˚F a 1 The expansion tank is the point of P1 = 65psig +14.7psia = 79.7psia t2 = higher temperature, ˚F no pressure change in the system. P2 = 90psig+14.7 psia = 104.7 psia -6 This can be seen from Boyle’s Law: Pa = atmospheric pressure, psia a = 6.5x 10 in/in˚F for steel t = 60˚F P1 = pressure at lower D temperature, psia P1V1/T1 = P2V2 /T2 V = 388.83 gallons P2 = pressure at higher t temperature, psia If the temperature (T1 and T2) and volume (V and V ) are constant Sizing of a Captive Air 1 2 v1 = specific volume of water at lower temperature, ft3/lb expansion tank with the pump on or off, then the pressure (P1 and P2) must also v2 = specific volume of water at 3 remain constant. higher temperature, ft /lb Pa= P1 = linear coefficient of thermal a Therefore the point of connection expansion, in./in. -˚F [(v2/ v1) – 1] – 3aΔt V = V of the expansion tank to the system = 6.5 x 10-6 in./in. -˚F for steel t s 1 – (P / P ) is a point of no pressure change. -6 a 2 = 9.5 x 10 in./in. -˚F for copper For Typically located at the suction side DT= (t - t ), ˚F of the system pumps. 2 1 Vs = 3000 gallons 3 V1 = .01602 ft /lb (40˚F) Chilled water sizing example: 3 V2 = .01613 ft /lb (100˚F) Sizing a plain steel tank for a chilled Pa = 79.7psia (due to tank precharge) water system with a temperature P1 = 65psig + 14.7psia = 79.7psia range of 40˚F to 100˚F (ambient P2 = 90psig + 14.7psia = 104.7psia temperature). a = 6.5x 10-6in/in F for steel Dt = 60˚F

Vt = 71.55 gallons

-6- Applications

To prevent air from being drawn Therefore, the general rule of not affect the pressure in the tank. into the system the pressure in the thumb in hydronic systems is that If there are multiple tanks in the system must be everywhere above “Expansion tanks should be locat- system then the pump head will atmospheric pressure. ed on the suction side of pumps.” affect the pressure in the tank. The pump will be able to transfer The location of the expansion tank Multiple expansion tanks will cause water from one tank to the other relative to the pump suction will pressure problems in systems. The depending on the pressure then determine if the system is location of the expansion tank in difference generated by the everywhere above atmospheric the system is the point of no pres- pump between the tanks. pressure. This can be seen in the sure change. The pump head does following figures.

In Figure 6 the expansion tank is FAN COIL located on the discharge side of the pump.

TACO CIRCULATOR The fill pressure is 25 psi. The pump

TACO TWIN TEE differential pressure is 35 psi. Since DISCHARGE SUCTION PRESSURE = 25 PSI PRESSURE = -10 PSI

the expansion tank is the point of TACO MULTI-PURPOSE VALVE no pressure change the pump dif- FILL VALVE PRESSURE = 25 PSI TACO AIR SEPARATOR TACO PUMP DIFFERENTIAL ferential pressure is subtractive from PRESSURE = 35 PSI TACO PRESSURE the fill pressure. The pump suction REDUCING VALVE

pressure is now -10 psi (25 – 35) or TACO EXPANSION below atmospheric. This will cause TANK NOTE: Not Recommended CHILLER air problems with air potentially being drawn into the system. Figure 6 – Expansion tank located on discharge of pump

Figure 7 is the expansion tank located on the suction side of the pump.

The fill pressure, and pump suc- FAN COIL tion pressure, is 25 psi. The pump differential pressure is 35 psi. Since TACO the expansion tank is the point of CIRCULATOR

no pressure change the pump dif- TACO TWIN TEE DISCHARGE SUCTION ferential pressure is additive to the PRESSURE = 60 PSI PRESSURE = 25 PSI TACO MULTI-PURPOSE fill pressure. The pump discharge VALVE FILL VALVE PRESSURE = 25 PSI TACO AIR SEPARATOR pressure is now 60 psi (25 + 35) or TACO PUMP DIFFERENTIAL PRESSURE = 35 PSI TACO PRESSURE above atmospheric. Everywhere in REDUCING VALVE

the system the pressure is above TACO EXPANSION atmospheric. TANK CHILLER

Figure 7 – Expansion tank located on suction side of pump

-6- -7- Applications

FAN COIL Figure 8 is a system with two expansion tanks. The point of no

TACO pressure change will be some- EXPANSION TANK TACO where between the two tanks. CIRCULATOR

TACO TWIN TEE POINT OF NO PRESSURE CHANGE Therefore, the general rule of IS BETWEEN EXPANSION TANKS

TACO thumb in hydronic systems is that MULTI-PURPOSE VALVE “Multiple expansion tanks in a system TACO AIR SEPARATOR TACO PUMP is not recommended” since unstable pressure conditions will result.

TACO EXPANSION TANK Types of CHILLER Expansion Tanks Figure 8 – Multiple expansion tanks in system Air Cushion Plain Steel Expansion Tank

FAN COIL

TACO CIRCULATOR

TACO TACO PLAIN STEEL TWIN TEE EXPANSION TANK Taco air cushion plain steel tanks SLOPE PIPE TACO PRESSURE UP TO TANK REDUCING VALVE TANK FITTING are applied in commercial, institu- COLD WATER SUPPLY

TACO tional and industrial applications for MULTI-PURPOSE VALVE the control of pressure in hydronic TACO TACO PUMP AIR SEPARATOR systems. The air cushion plain steel tank uses a tank filled with water and an air cushion at the top of the CHILLER tank for water to expand into as it Figure 9 – Air cushion or plain steel expansion tank is heated.

In this tank it is desirable to direct TANK the separated air from the air sepa-

AIR rator to the space above the water level in the expansion tank (Figure 9). The air from the air separator WATER is piped to the expansion tank through a special tank fitting.

BAFFLE TRAPS AIR AND DIRECTS This fitting directs the air to the top IT TO THE TOP OF TANK THRU OUTER TUBE portion of the tank, and discour- ages air from migrating back into the system (Figure 10), when the TANK FITTING system cools. Note that since Figure 10 – Expansion tank air fitting

-8- Applications

the air is “recycled” to provide a Partial Acceptance Captive Air Partial Acceptance cushion in the expansion tank, this Diaphragm Expansion Tank Captive Air Bladder system is called an “Air Control” Taco CX partial acceptance Captive Expansion Tank system. As noted previously the air Air diaphragm expansion tanks Taco CBX partial accep- cushion in the tank can be deplet- are applied in commercial, institu- tance bladder Captive ed due to absorption of air into tional and industrial Air expansion tanks are the water. It can also be depleted applications for the applied in commercial, by loosing air through air vents in control of pressure institutional and indus- the piping. Care must also be taken in hydronic systems. trial applications for the to insure that piping between the Diaphragm tanks use control of pressure in air separator and the plain steel a diaphragm to per- hydronic systems. CBX expansion tank is pitched at least manently separate bladder tanks use a field replace- 3 degrees (Figure 9) to facilitate the air and water. able bladder to permanently sepa- the migration of captured air back In a diaphragm tank rate the air and water. into the expansion vessel. Systems the air is held captive by the use of This permanent separation allows with plain steel expansion tanks a diaphragm with the expanded the tank to be precharged on the must not have automatic air vents water being held on one side of the air side to the minimum operat- installed as this will lead to the loss diaphragm and air on the other. ing or fill pressure. This eliminates of the expansion tank air cushion. This permanent separation allows many gallons of water to compress if air is lost in the tank then the tank the tank to be precharged on the atmospheric pressure air in an air will become water logged.With a air side to the minimum operat- cushion or plain steel tank to the fill water-logged expansion tank, the ing or fill pressure. This eliminates pressure. This allows the reduction expanded water must now seek a many gallons of water to compress in Captive Air expansion tank sizes new outlet which can be the relief atmospheric pressure air in an air of up to 80% compared to air cush- valve on one of the major compo- cushion or plain steel tank to the fill ion or plain steel tanks. nents. pressure. This allows the reduction As note previously the tank must be in Captive Air expansion tank sizes In a bladder tank the bladder is not sized for the expansion of the water of up to 80% compared to air cush- attached to the tank wall like a dia- in the system plus the initial charge ion or plain steel tanks. phragm tank. Rather it is suspended of water to compress atmospheric In a diaphragm tank the diaphragm inside the tank very much like a bal- air in the tank to the fill pressure. is attached to the tank wall and loon. Expanded water flows into the This makes the tank much larger. cannot move inside the tank. As a inside of the bladder. Air is on the The tank is also subject to corrosion result the tank has a limited accep- outside of the bladder between the with the presence of air and oxygen tance volume. In addition, there bladder and the tank. As a result in the tank. is some water in contact with the no water is in contact with the tank tank wall providing an opportunity wall minimizing corrosion Applications for corrosions. In a partial acceptance bladder tank • Smaller systems the bladder is of limited acceptance • Lower cost Applications volume and does not stretch. As • Smaller systems • Ceiling mounted to a result, if there is an overpressure save floor space • Lower cost condition in the system the bladder will burst, again, very much like a balloon.

Applications -8- -9- • Larger systems • Lower cost Applications

Full Acceptance Captive Air the tank to be precharged on is in contact with the tank wall Bladder Expansion Tank the air side to the minimum minimizing corrosion. In a full Taco CA full acceptance bladder operating or fill pressure. This acceptance bladder tank the Captive Air expansion tanks are eliminates many gallons of water bladder is of full acceptance applied in com- to compress atmospheric pres- volume and can expand to the mercial, institu- sure air in an air cushion or plain full volume of the tank. As a tional and indus- steel tank to the fill pressure. This result, the bladder will not burst trial applications allows the reduction in Captive Air if the system experiences an for the control expansion tank sizes of up to 80% overpressure condition. of pressure in compared to air cushion or plain hydronic systems. steel tanks. Applications • Larger systems CA tanks use a In a bladder tank the bladder is field replaceable not attached to the tank wall like • Systems where reliability bladder to per- a diaphragm tank. Rather it is and lower maintenance costs are important manently sepa- suspended inside the tank very rate the air and much like a balloon. Expanded “P” option available for water. water flows into the inside of the applications requiring NSF/ANSI 61-G certification bladder. Air is on the outside of This permanent the bladder between the bladder separation allows and the tank. As a result no water

-10- Selection Procedure

EXAMPLE 1 Sizing of a Captive Air Calculation of Net expansion tank system expansion — Problem: P = P Select a full acceptance bladder a 1 Net

style expansion tank for a chilled [(v2/ v1) – 1] – 3aΔt System

water installation. The mechanical Vt = Vs Expansion = Vs {[(v2/ v1)-1] – 3 α Δt}

room and expansion tank are locat- 1 – (Pa/ P2) -6 ed on the lower level. Reliability 3 = 3000 {[(.01613/.01602) -1] – 3 (6.5x10 ) 60} vt = .01602 ft /lb (40˚F) and maintenance costs are a consid- v = .01613 ft3/lb (100˚F) eration. Steel system piping. 2 = 3000 {.005696} a = 6.5x 10-6in/in ˚F for steel Conditions: Δt = 60˚F = 17.09 gallons System Volume = 10,000 gallons P1 = 100 ft * .434 psi/ft + 5 psig Minimum temperature = 40˚F (for positive pressure at top Maximum temperature = 100˚F of building) + 14.7 psia Building height = 100 ft. = 48.4 psia Relief valve (chiller) = 90psig P2 = 90psig + 14.7psia = 104.7 psia

Calculate required tank volume – For a system where reliability and maintenance are important select

[(v2/ v1) – 1] – 3aΔt tank with full acceptance. Captive

Vt = Vs Air bladder tank model CA140.

1 – (Pa/ P2) The bladder on this tank is unaf- fected by overpressure conditions -6 Vt = 3000 {[(.01613/.01602) -1] – 3 (6.5x10 ) 60}/ (1 – 48.4/104.7) in the system and is more reliable. Acceptance volume of the tank is = 31.78 gallons 37 gallons and the volume of the tank is 37 gallons.

-10- -11- Selection Procedure

EXAMPLE 2

Problem: Select an expansion tank for a heating water installation. The mechani- Calculation of Net system expansion – cal room and expansion tank are Net System Expansion located on the roof. First cost is a = Vs {[(v2/ v1)-1] – 3 α Δt} major consideration. System piping copper. = 1000 {[(.01692/.01602) -1] – 3 (9.5x10-6) 200} Conditions: System volume 1,000 gallons. = 1000 {.05047} Minimum temperature = 40 F Maximum temperature = 240 F = 50.48 gallons Building height = 50 ft Relief Valve at boiler = 50 psig Calculate required tank volume – Sizing of a Captive Air

expansion tank [(v2/ v1) – 1] – 3aΔt

Vt = Vs Pa= P1 1 – (Pa/ P2)

[(v2/ v1) – 1] – 3aΔt -6 Vt = 1000 {[(.01692/.01602) -1] – 3 (9.5x10 ) 200}/ (1 – 24.04/64.7) Vt = Vs

1 – (Pa/ P2) = 80.32 gallons v = .01602 ft3/lb (40˚F) 1 Because first cost is a major consideration select a partial acceptance v2= .01692 ft3/lb (240˚F) -6 Captive Air bladder tank model CBX425. This tank is lower first cost than α=9.5x 10 in/in F for copper piping a full acceptance Captive Air tank. However, it is subject to a burst blad- Δt=200 F der under over pressure conditions. Acceptance volume of the tank is 61 gallons. The volume of the tank is 112 gallons. Determine minimum pressure – Minimum pressure equals static pressure plus 5 psi positive pressure at top of the building (assume 10 ft of static pressure).

P1 = 10ft x .434 psi/ft + 5 psi (positive pressure) + 14.7 psia

= 24.04 psi Maximum pressure equal the relief valve setting P2 = 50 psig +14.7 psia = 64.7 psia Submittal Data #401-083 Product Data #401-083P

Effective December 1, 2014

TANK H B D R SHIPPING MODEL VOLUME HEIGHT DIAMETER DIAMETER RADIUS WEIGHT SYSTEM NUMBER CONNECTION GAL. LIT. INCH MM INCH MM INCH MM INCH MM LBS. Kg SIZE CA90-125 23 90 29-1/8 740 16 406 20 508 4-1/4 108 120 55 1" NPT (25.4mm) CA140-125 37 140 40-1/8 1019 16 406 20 508 4-1/2 114 195 88 1" NPT (25.4mm) CA215-125 57 215 58-7/8 1495 16 406 20 508 4-1/2 114 290 132 1" NPT (25.4mm) CA300-125 79 300 57-3/4 1467 20 508 24 610 5 127 320 145 1-1/2" NPT (38.1mm) CA450-125 119 450 77-3/8 1965 20 508 24 610 5 127 400 181 1-1/2" NPT (38.1mm) CA500-125 132 500 85-3/4 2178 20 508 24 610 5 127 420 191 1-1/2" NPT (38.1mm) CA600-125 158 600 71-7/8 1826 24 610 30 762 6-1/4 159 460 209 1-1/2" NPT (38.1mm) CA700-125 185 700 80-5/8 2048 24 610 30 762 6-1/4 159 525 238 1-1/2" NPT (38.1mm) CA800-125 211 800 89-7/8 2283 24 610 30 762 6-1/4 159 590 268 1-1/2" NPT (38.1mm) CA900-125 238 900 73-1/8 1857 30 762 36 914 7-7/16 189 690 313 1-1/2" NPT (38.1mm) CA1000-125 264 1000 79 2007 30 762 36 914 7-7/16 189 790 358 1-1/2" NPT (38.1mm) CA1100-125 291 1100 85-1/4 2165 30 762 36 914 7-7/16 189 865 392 1-1/2" NPT (38.1mm) CA1200-125 317 1200 91 2311 30 762 36 914 7-7/16 189 940 426 1-1/2" NPT (38.1mm) CA1300-125 344 1300 97 2464 30 762 36 914 7-7/16 189 980 445 1-1/2" NPT (38.1mm) CA1400-125 370 1400 103 2616 30 762 36 914 7-7/16 189 1020 463 1-1/2" NPT (38.1mm) CA1500-125 396 1500 73-3/8 1864 40 1016 48 1219 10-15/16 278 1200 544 1-1/2" NPT (38.1mm) CA1600-125 422 1600 76-5/8 1946 40 1016 48 1219 10-15/16 278 1380 626 1-1/2" NPT (38.1mm) CA1800-125 475 1800 83-1/2 2121 40 1016 48 1219 10-15/16 278 1515 687 1-1/2" NPT (38.1mm) CA2000-125 528 2000 90-3/8 2296 40 1016 48 1219 10-15/16 278 1650 748 1-1/2" NPT (38.1mm) CA2500-125 660 2500 107-1/8 2721 40 1016 48 1219 10-15/16 278 1838 834 1-1/2" NPT (38.1mm) CA3000-125 792 3000 94-1/8 2391 44 1118 54 1372 11-7/16 291 2025 919 2" NPT (50.8mm) CA4000-125 1056 4000 120-3/4 3067 44 1118 54 1372 11-7/16 291 2400 1089 2" NPT (50.8mm) CA5000-125 1320 5000 150-1/4 3816 44 1118 54 1372 11-7/16 291 3100 1406 2" NPT (50.8mm) CA7500-125 1980 7500 128-3/4 3270 62 1575 72 1829 11-1/2 292 3850 1746 3" NPT (76.2mm) CA10000-125 2640 10000 158-1/4 4020 62 1575 72 1829 11-1/2 292 4500 2041 3" NPT (76.2mm)

System Charging Valve Enclosure R Connection (SEE TABLE) Lifting Ring

1/2” NPT (12.7mm) 1/2” NPT (12.7mm) (FACTORY USE ONLY) CA600 — 125 & Larger (FACTORY USE ONLY) NSF Non-NSF H Lifting Ring NSF/ANSI 61-G [ P] Option, Example: P/N PAX30-150P) 1/2” NPT (12.7mm) DRAIN Models certified to NSF 61-G are required to be installed on the cold (CA140 — 125 to CA2500 — 125) water side of the hot water heater. 1-1/2” NPT (38.1mm) DRAIN (CA3000 — 125 to CA10000 — 125) See Related Documents: 402-002 Instruction Sheet 402-013 Instruction Sheet, Replacement Bag B DO NOT PIPE TO DRAIN 401-083 Submittal Data 401-083P Submittal Data, NSF D

-13- Mechanical Specifications

Part 1 GENERAL C. Certificates: Inspection 1.6 DELIVERY, STORAGE, certificates for pressure 1.1 SECTION INCLUDES AND HANDLING vessels from authority A. Expansion tanks having jurisdiction. A. Accept equipment on site in shipping containers with 1.2 RELATED SECTIONS D. Manufacturer’s Installation labeling in place. Inspect Instructions: Indicate hanging for damage. A. Section - Hydronic Piping. and support methods, joining procedures. B. Provide temporary end caps 1.3 REFERENCES and closures on piping and E. Project Record Documents: fittings. Maintain in place A. ASME (BPV VIII, 1) - Boiler Record actual locations of until installation. and Pressure Vessel Code, flow controls. Section VIII, Division 1 - Rules C. Protect piping components for Construction of Pressure F. Maintenance Data: Include from entry of foreign materials Vessels; The American Society installation instructions, by temporary covers, com of Mechanical Engineers; 2006. assembly views, lubrication pleting sections of the work, instructions, and replacement and isolating parts of 1.4 SUBMITTALS parts list. completed system.

A. See Section 01300 - 1.5 QUALITY ASSURANCE 1.7 MAINTENANCE SERVICE Administrative Requirements, for submittal procedures. A. Manufacturer Qualifications: A. Contractor to furnish service Company specializing in and maintenance for one year B. Product Data: manufacturing the type of from date of substantial Provide product data for products specified in this completion. manufactured products section, with minimum five and assemblies required years of documented 1.8 EXTRA MATERIALS for this project. Include experience. component sizes, A. See Section 01400 - Project rough-in requirements, Requirements, for additional service sizes, and finishes. provisions. Include product description, model and dimensions.

-14- Mechanical Specifications

Part 2 PRODUCTS 2.1 ASME Full Bladder D. Automatic Cold Water Fill Part 3 EXECUTION TYPE EXPANSION Assembly (field installed 3.1 INSTALLATION TANKS by others): Pressure reducing valve, reduced A. Install specialties in A. Manufactures: pressure double check back accordance with 1. Taco, Inc; Model CA ______: flow preventer, test cocks, manufacturer’s instructions. www.taco-hvac.com strainer, vacuum breaker, and valved by-pass. B. Where large air quantities can 2. ITT Bell & Gossett accumulate, provide enlarged E. Size: air collection standpipes. 3. Amtrol Inc 1. HW Tank Capacity: ______., C. Provide manual air vents at 4. Substitutions: ______system high points and as See Section 01600 - acceptance volume. indicated. Product Requirements. 2. CW Tank Capacity: D. For automatic air vents in B. Construction: Welded steel, ______., ceiling spaces or other designed, tested and stamped ______concealed locations, provide in accordance with ASME acceptance volume. vent tubing to nearest drain. (BPV code sec VIII, div 1); supplied with National Board F. Hot Water Heating System: E. Air separator and expansion Form U-1, rated for working tank to be installed on the pressure of 150 psi , with 1. Select expansion tank suction side of the system flexible heavy duty butyl pressure relief valve at pumps. Expansion tank to rubber bladder. Bladder shall _____ psi maximum. be tied into system piping be able to accept the full in close proximity to air volume of the expansion tank 2. Set pressure reducing separator and system fill line. and shall be removable and valve at ____ psi. replaceable. F. Provide valved drain and hose G. Chilled Water System: connection on strainer blow C. Accessories: Pressure gage down connection. (field installed in adjacent 1. Select expansion tank piping by others) and pressure relief valve at G. Provide relief valves on air-charging fitting ; precharge _____ psi maximum. pressure tanks, low to ____ psi. pressure side of reducing 2. Set pressure reducing valves, heat exchangers, and valve at _____ psi. expansion tanks.

-14- -15- Mechanical Specifications

H. Select system relief valve K. Clean and flush glycol system N. Feed glycol solution to system capacity so that it is greater before adding glycol solution. through make-up line with than make-up pressure Refer to Section 15189. pressure regulator, venting reducing valve capacity. system high points. Select equipment relief L. Feed glycol solution to system valve capacity to exceed through make-up line with O. Perform tests determin- rating of connected pressure regulator, venting ing strength of glycol and equipment. system high points. water solution and submit written test results. I. Pipe relief valve outlet to M. Feed glycol solution to system nearest floor drain. through make-up line with pressure regulator, J. Where one line vents several venting system high points. relief valves, make cross Set to fill at ___ psi. sectional area equal to sum of individual vent areas.

Taco quality through & through

Hydronic professionals everywhere trust Taco for the highest quality systems, components, technology, and support. Visit taco-hvac.com for more information on CA Expansion Tanks, additional products, systems, software & training.

Taco Inc., 1160 Cranston Street, Cranston, RI 02920 / (401) 942-8000 / Fax (401) 942-2360 Taco (Canada) Ltd., 8450 Lawson Road, Unit #3, Milton, Ontario L9T 0J8 / (905) 564-9422 / Fax (905) 564-9436 www.taco-hvac.com