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HFT Expansion Tanks for
Hydronic Heating Systems
https://qr.xylem.com/4scfx2
Safety Instruction
This safety alert symbol will be used in this manual to draw
attention to safety related instructions. When used, the safety
alert symbol means ATTENTION! BECOME ALERT! YOUR SAFETY
IS INVOLVED! FAILURE TO FOLLOW THESE INSTRUCTIONS MAY
RESULT IN A SAFETY HAZARD.
WARNING:
This product can expose you to chemicals
including Lead, which is known to the State of
California to cause cancer and birth defects or
other reproductive harm. For more information go
to: www.P65Warnings.ca.gov.
WARNING: Explosion or Rupture Hazard
A relief valve must be installed to prevent
pressure in excess of local code requirement or
maximum working pressure designated in the
Product Manual, whichever is less. Do not expose
Product to freezing temperatures or temperatures
in excess of 240°F. Do not adjust the pre-charge or
re-charge this Product except for any adjustments
at the time of the initial installation, especially if
Product is corroded, damaged or with diminished
integrity. Adjustments to pre-charge must be done
at ambient temperature only. Failure to properly
size the Product or follow these instructions may
result in excessive strain on the system and may
lead to Product failure, serious or fatal personal
injury, leakage, and/or property damage.
WARNING:
Read carefully the product installation, operating
and maintenance instructions. Failure to follow
the instructions and warnings in the manual may
result in serious or fatal injury and/or property
damage, and will void the product warranty.
This product must be installed by a qualified
professional. Follow all applicable local and state
codes and regulations, in the absence of such
codes, follow the current editions of the National
Plumbing Code and National Electric Code, as
applicable.
Description
When water is heated, it expands. Provision must be made for
this expansion in a closed hot water heating system. The Bell
& Gossett Series HFT pre-charged diaphragm tank stores the
expanded hot water and returns air-free water to the system
when the temperature drops.
Operational limits
Maximum Operating Pressure: 100 PSI.
Maximum Operating Temperature: 240℉.
WARNING:
This product, like most products under pressure,
may over time corrode, weaken and burst or
explode, causing serious or fatal personal injury,
leaking or flooding and/or property damage. To
minimize risk, a licensed professional must install
and periodically inspect and service the Product.
A drip pan connected to an adequate drain must
be installed if leaking or flooding could cause
property damage. Do not locate in an area where
leaking could cause property damage.
Installation instructions
A. Pre-installation
1. Visually inspect expansion tank and check for damage prior
to installation.
INSTRUCTION MANUAL
V1000002 Rev C
EN, FR, ES
1
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Summary of Contents for Xylem Bell & Gossett HFT Series
- Page 1 INSTRUCTION MANUAL V1000002 Rev C EN, FR, ES HFT Expansion Tanks for Hydronic Heating Systems https://qr.xylem.com/4scfx2 Safety Instruction WARNING: Read carefully the product installation, operating and maintenance instructions. Failure to follow This safety alert symbol will be used in this manual to draw the instructions and warnings in the manual may attention to safety related instructions.
- Page 2 WARNING: WARNING: RUPTURE OR EXPLOSION HAZARD If the expansion tank is damaged, it must be Like most pressurized tanks, this tank can over replaced. Failure to follow this instruction may time corrode, weaken, and burst or explode. result in serious personal injury or death and Failure to follow this instruction may result in property damage.
- Page 3 entering the tank until the system pressure exceeds the pre- WARNING: charge pressure. Signs of leakage or corrosion are indications 2. As the water temperature rises, expanded water enters the the tank may have failed. Periodically check the expansion tank’s water reservoir. The pre-charge air chamber expansion tank for signs of external leakage or absorbs the pressure increase, keeping system pressures corrosion.
- Page 4 WARNING: System fluid under pressure and/or at high temperatures can be very hazardous. Before servicing, reduce system pressure to zero or isolate the vessel from the system. Allow system to cool below 100°F and above 35°F. Failure to follow this instruction may result in serious personal injury and/or property damage.
- Page 5 Warranty Commercial warranty Warranty. For goods sold to commercial buyers, Seller warrants the goods sold to Buyer hereunder (with the exception of membranes, seals, gaskets, elastomer materials, coatings and other “wear parts” or consumables all of which are not warranted except as otherwise provided in the quotation or sales form) will be (i) be built in accordance with the specifications referred to in the quotation or sales form, if such specifications are expressly made a part of this Agreement, and (ii) free from defects in material and workmanship for a period of one (1) year from the date of installation or two (2) years from the date of manufacture, whichever shall occur first, unless a longer period is specified in the product documentation (the “Warranty”).
- Page 6 Limites opérationnelles Consignes de sécurité Pression de fonctionnement maximale : 690 kPa (100 PSI). Température de fonctionnement maximale : 116 °C (240 °F). Ce symbole d'alerte de sécurité sera utilisé dans ce manuel pour attirer l'attention sur les consignes relatives à la AVERTISSEMENT: sécurité.
- Page 7 situé sur la conduite d'alimentation. Cette combinaison permet zone. Dans ce cas, un seul réservoir d’expansion est requis pour à la fois de contrôler l'eau étendue et l'évacuation automatique le système. continue de l'air du système. Après avoir installé les réservoirs HFT Bell & Gossett sur le système : 1.
- Page 8 correctement installée et de taille appropriée doit être installée et en bon état de fonctionnement. Pendant le remplissage et le démarrage après l’entretien, la pression du système doit être étroitement surveillée pour s’assurer que la pression ne dépasse pas la valeur nominale de la soupape de décharge.
- Page 9 AVERTISSEMENT: Les fluides du système sous pression et/ou à haute température peuvent être dangereux. Avant l'entretien, réduire la pression du système à zéro ou isoler le contenant du système. Laisser le système refroidir en dessous de 38 ºC (100 ºF) et plus de 35 ºC (95 ºF).
- Page 10 Garantie Garantie pour utilisation commerciale Garantie. Concernant les biens vendus aux acheteurs commerciaux, le vendeur garantit que les biens vendus ci-dessous (sauf les membranes, joints d’étanchéités, joints, matériaux en élastomère, revêtements et autres « pièces d’usure » ou consommables, qui ne sont pas garantis, sauf indication contraire dans le devis ou formulaire de vente) seront (i) intégrés selon les spécifications indiquées dans le devis ou le formulaire de vente, si ces dernières font partie intégrante de cette entente, et (ii) seront exempts de tout défaut matériel et de fabrication pendant une période d’un (1) an à...
- Page 11 Certains états ne permettent pas les limites de durée d’une garantie implicite, la limite ci-dessus peut ne pas vous concerner. Certains états ne permettent pas une exclusion ou une limite de dommages accidentels ou consécutifs, ainsi les exclusions ci-dessus peuvent ne pas vous concerner. La présente garantie vous accorde des droits légaux spécifiques et il se peut que vous ayez d’autres droits qui peuvent varier d’une province à...
- Page 12 Límites de funcionamiento Instrucciones de seguridad Presión de funcionamiento máxima: 100 psi (6,9 bar) Temperatura de funcionamiento máxima: 240℉. Este símbolo de alerta de seguridad se utilizará en este manual a fin de llamar la atención sobre las instrucciones ADVERTENCIA: relacionadas con la seguridad.
- Page 13 ofrece tanto el control del agua expandida como la eliminación automática continua de aire del sistema. Después de instalar los tanques HFT de Bell & Gossett en el sistema: 1. Llene el sistema. 2. Ventile el aire del sistema. 3. Lleve el sistema a su temperatura máxima de funcionamiento.
- Page 14 Durante el llenado e inicio después del mantenimiento, la presión del sistema debe vigilarse cuidadosamente para garantizar que la presión no excede la capacidad de la válvula de alivio de presión. Consulte las instrucciones aplicables del fabricante de la válvula de alivio de presión según sea necesario.
- Page 15 ADVERTENCIA: El fluido del sistema bajo presión o a alta temperatura puede ser muy peligroso. Antes de realizar las tareas de mantenimiento, reduzca la presión del sistema a cero o aísle el recipiente del sistema. Deje enfriar el sistema a menos de 100 °F (38 °C) y por encima de 35 °F (1,6 °C).
- Page 16 Garantía Garantía comercial Garantía. Para los productos vendidos a compradores comerciales, el Vendedor garantiza que los productos vendidos al Comprador en virtud del presente (con excepción de membranas, sellos, juntas, materiales de elastómero, revestimientos y otras “partes de desgaste” o consumibles, que no se garantizan, con excepción de lo dispuesto por el contrario en la cotización o el formulario de venta) (i) se construirán de acuerdo con las especificaciones referidas en la cotización o el formulario de venta, si tales especificaciones se realizan expresamente como parte de este Acuerdo, y (ii) se encontrarán libres de defectos en material y mano de obra por un período de un (1) año desde la fecha de instalación o dos (2) años desde la fecha de fabricación, lo que ocurra...
- Page 17 Algunos estados no permiten las limitaciones al plazo de duración de una garantía implícita, por lo que las limitaciones anteriores pueden no aplicarse en su caso. Algunos estados no permiten las exclusiones o limitaciones de daños incidentales o resultantes, por lo que las exclusiones anteriores pueden no aplicarse en su caso.
- Page 18 Morton Grove, IL 60053 Tel: (847) 966–3700 Fax: (847) 965–8379 www.xylem.com/bellgossett Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries. All other trademarks or registered trademarks are property of their respective owners. © 2025 Xylem Inc.
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