Heat-Flo 22-BT-2 Service manual

INSTALLATION, OPERATING, AND
SERVICE INSTRUCTIONS
HEAT-FLO HYDRONIC BUFFER TANK
MODELS 22-BT-2, 22-BT-4, 30-BT, 40-BT-2, 60-BT-2, 80-BT-2, 115-BT-2
Conforms to UL STD 174 NSF/ANSI 372
Certified to CAN/CSA STD C22.2 No. 110-94
For service or repairs to the tank, call your heating contractor. Your tank has been manufactured to provide
years of service. In order to ensure proper service, the following information is provided to assist in enabling
the installation, operation, and maintenance of this tank. For your comfort, safety, and convenience, we
recommend that this tank be installed and serviced by a plumbing professional. When the installation is
completed, keep this manual with the tank. Information and specifications outlined in this manual are in
effect at the time of the printing of this manual. Heat-flo reserves the right to discontinue, change
specifications, or change systems at any time without notice.
Heat-flo, Inc.
15 Megan CT., P.O. Box 612 Uxbridge, MA 01569 USA

Safety Information
The following terms and symbols are used to bring attention to the presence of
various risk levels, or to important information concerning product life.
Indicates presence of a hazard, which will cause severe personal injury, death,
or substantial property damage if ignored.
Indicates the presence of a hazard, which can cause severe personal injury,
death, or substantial property damage if ignored.
Indicates the presence of a hazard, which can cause minor personal injury or
damage if ignored.
Indicates special instructions on installation, operation, or maintenance, which
are important but not related to personal injury hazards.

Table of Contents
General Information 1, 2
Dimensions and Capacities 3
Buffer Tank Sizing 4
Heat-flo’s Limited Warranty 5, 6

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IMPORTANT INFORMATION –READ CAREFULLY
NOTE: The equipment shall be installed in accordance with those installation regulations required in the area where
the installation is to be made. These regulations shall be carefully followed in all cases. Authorities having jurisdiction
shall be consulted before the installations are made.
All wiring must be in accordance with the National Electrical Code (latest edition) and/or local regulations in the
US, and in accordance with the Canadian Electrical Code (latest edition) and/or local regulations in Canada.
Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury,
or loss of life. Read and understand the entire manual before attempting installation, start-up, operation, or service.
Installation and service must be performed only by an experienced, skilled installer or service agency.
This tank contains very hot water under high pressure. Do not unscrew any pipe fittings or attempt to disconnect
any components of this tank without positively assuring that the water is cool and has no pressure. Always wear
protective clothing and equipment when installing, starting up or servicing this tank to prevent scalding injuries. Do
not rely on the pressure and temperature gauges to determine the temperature and pressure of the tank. This tank
contains components that become very hot when the boiler is operating. Do not touch any components unless they
are cool.
Failure to follow all instructions in the proper order can cause personal injury or death. Read all instructions,
including all those contained in component manufacturers’ manuals before installing, starting up, operating,
maintaining, or servicing the tank.
To reduce the risk of excessive pressures and temperatures in this tank, install pressure protective equipment
required by local codes but no less than a relief valve certified by a nationally recognized testing laboratory that
maintains periodic inspection of production of listed equipment or materials, as meeting the requirements for Relief
Valves and Automatic Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22-latest edition. This valve must be
marked with a maximum set pressure not to exceed the marked working pressure of the hydronic system. Install the
valve and orient it or provide tubing so that any discharge from the valve will exit only within 6 inches above, or at
any distance below, the structural floor, and cannot contact any live electrical part. The discharge opening must not
be blocked or reduced in size under any circumstances.
DO NOT store or use gasoline or other flammable vapors or liquids in the vicinity of this or any other appliance. If
you smell gas vapors, DO NOT try to operate any appliance - DO NOT touch any electrical switch or use any phone
in the building. Immediately, call the gas supplier from a remotely located phone. Follow the gas supplier’s
instructions or if the supplier is unavailable, contact the fire department. Do not operate any appliance until the
leakage is corrected.

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IMPORTANT SAFETY INSTRUCTIONS
READ ALL INSTRUCTIONS BEFORE USING THIS BUFFER TANK.
When using electrical appliances, safety precautions should be taken to reduce the risks of fire,
electric shock, and injury. These precautions include the following:
•This tank must be grounded if an electrical control is used.
•Install or locate this buffer tank only in accordance with the provided installation
instructions.
•Use this tank only for its intended use as described in this manual.
•As with any appliance, close supervision is necessary when used by children.
•This tank should be installed and serviced only by qualified personnel.
SAVE THESE INSTRUCTIONS
Application: Geothermal Heat Pumps/ Chillers/ Low Mass Boilers
The primary application of a buffer tank is to reduce heat pump, chiller, or boiler short cycling.
Hydronic buffer tanks are used in systems operating below the design load condition, which is
most of the time, or in systems having several low BTU cooling or heating loads calling at different
times. This can cause the chiller or boiler to short cycle, resulting in reduced operating efficiency
and shorter equipment life.
The hydronic buffer tanks that are 40 gallons or larger are built with 5, 2” connections. Alternate-
sized connections are available upon request. If piped correctly, the tank can serve as both a
thermal buffer and a hydraulic separator. The chiller or boiler can be hydraulically decoupled
from the distribution system. The tanks are all 316L stainless steel construction with R-16
insulation and an ABS jacket. Buffer tanks are available in 22, 30, 40, 60, 80, and 115 gallon
capacities.
A 3/8” ID thermal well is located on all unit’s size 30 gallon and up mid-tank. Thermistors can be
inserted 3” into the well, or the well will accept most standard Controls.
The buffer tanks are all stainless steel construction, insulated with a thermoplastic jacket.

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DO NOT use in potable water systems.
Use this vessel only in hydronic systems. The installer must comply with all plumbing codes. Do not
operate above the temperature or pressure specified on the rating plate. Failure to comply may result
in personal injury, property damage, or death.
On the following page, an example of piping a buffer tank is provided, which shows a water source heat
pump application. In all applications, note that the tank top fitting should be piped to the distribution
supply line and the air purger and vent. This way, the tank will be self venting, and no additional air vent
is needed to install or maintain.
The objective in any application is to pipe the buffer tank such that the heating or cooling source is
hydraulically decoupled from the distribution system.

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Heat-flo, Inc.
LIMITED WARRANTY
Hydronic Buffer Tanks
Your tank is protected by these Heat-flo, Inc., (HFI), warranties. These warranties are applicable to
original consumer purchases only.
WARRANTY COVERAGE FOR RESIDENTIAL USAGE
The warranties listed in this section shall apply to tanks used in a residential setting by the original
consumer purchasers only. A “residential setting” as used herein shall mean usage in a single-family
dwelling in which the original consumer purchaser of the tank resides on a permanent basis.
“Residential setting shall also mean usage in a multiple family dwelling provided that the tank services
only one (1) dwelling in a multiple family dwelling.
LIMITED WARRANTY ON TANK
HFI warrants that the tank shall be free from leaks due to material or manufacturing defects during
normal use and service for one of two time periods:
1. LIMITED FIVE YEAR WARRANTY –HFI warrants that the tank shall be free from leaks due
to material or manufacturing defects for five years, as long as the original consumer purchaser owns
the home (residence) in which the tank is located.
2. ADDITIONAL LIMITED LIFETIME WARRANTY
HFI further warrants to the original user that for an additional period of ten (10) years from the date
of expiration of the first five (5) years of this warranty set forth above, the tank assembly shall be free
of leaks during normal use and service. In the event that a leak should develop and occur within this
limited warranty period due to a defective material or workmanship, we will furnish a replacement
tank of the nearest comparable model current at the time of replacement. Replacement will be made
upon payment by the original user of a percentage of the suggested retail price at the time of
replacement as set forth in the following schedule:
WARRANTY ON THE OPERATING CONTROL
The operating control (if applicable) is warranted by original manufacturer for a period of one (1)
year from installation date. If no documentation is available as proof of installation, the warranty on
the operating control will commence on the date of manufacture of the associated tank.
Within 6th through 7th - 60%
Within 8th through 9th - 65%
Within 10th through 11th - 70%
Within 12th through 13th - 75%
14th year and beyond - 80%
BT

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WARRANTY COVERAGE FOR COMMERCIAL USAGE
The warranties listed in this section shall apply to Heat-flo, Inc., tanks used in a commercial setting by the
original commercial purchasers only. A “commercial setting” as used herein shall mean any usage not
falling within the above definition of a “residential setting”.
Heat-flo, Inc. warrants that it will repair or replace, at its option, without charge, any defect or
malfunctioning of the tank within the warranty period set forth below. Replacement units are limited to one
replacement per installation.
During the first through fifth years after the original date of delivery to the original commercial purchaser,
Heat-flo, Inc., will repair or replace, at its option, without charge, any tank having a defect or malfunction
due to a manufacturing defect that results in a water leak from the outer jacket, inner tank, or heat exchanger
(if applicable) as a result of normal use and service. It is expressly agreed between Heat-flo, Inc., and the
original consumer purchaser that the repair or replacement is the exclusive and sole remedy of the original
consumer purchaser.
If Heat-flo, Inc. is unable to repair or replace the tank so as to conform with this warranty after a
reasonable number of attempts, then Heat-flo, Inc., will provide, at its option, either a replacement
product, or a full refund of the purchase price. These remedies are the exclusive remedies of the original
consumer purchaser.
EXCLUSIONS AND LIMITATIONS
This warranty extends to the original purchaser only (including first occupants of a new home), is
non-transferable and shall apply only if:
1. The unit is correctly installed according to the installation instructions provided with the unit.
2. The unit is operated within the factory specified temperature limits, and at a water pressure not
exceeding 60 psi.
3. Components of the tank which are not defective but must be replaced as a result of reasonable
wear and tear.
4. Water Quality: The warranties extended by HFI are conditioned upon potable water with a Ph not
to exceed 8.0 and not below 6.0. and / or chloride concentrations not to exceed 100 parts per
million (ppm). HFI specifically disclaims liability of any kind resulting from or relating to
potable water that does not match these characteristics.
5. Any failure or malfunction resulting from improper or negligent operation, accident, abuse
(including freezing), misuse, unauthorized alteration or improper repair or maintenance.
6. Any failure or malfunction resulting from failure to keep the unit full of water, free to circulate at
all times, and the tank free of damaging water sediment or scale deposits.
7. The unit is used within the United States, its territories or possessions, or Canada.
8. The warranty does not cover labor costs, shipping charges, or deliver expenses, nor administrative
fees incurred by the purchaser in removing or reinstalling the unit. Heat-flo will not accept claims
for labor costs incurred by the original consumer purchaser in removing or reinstalling the tank.
9. Malfunctions resulting from, or repairs necessitated by, uses of the tank for purposes other than
that for which it was designed, or resulting from flood, fire, wind, or lightning.
BT
BT

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OWNER’S RESPONSIBILITIES
The owner or installer must:
1. Have the buffer tank installed with a pressure relief valve in the system in accordance with local, state,
and federal codes and ordinances bearing the listing marks of the American Society of Mechanical
Engineers (A.S.M.E).
2. Operate the tank at a pressure below that shown on the rating plate on the pressure relief valve.
3. Keep the tank free of scale deposits.
4. Make provisions so if the tank or any component part or connection should leak, the resulting flow of
water will not cause damage to the area in which it is installed.
The warranty hereunder does not apply to defects resulting from:
1. Freezing, excessive pressure, or leaks at water connections.
2. Failure of a component, control, or component part other than a component part manufactured solely
by HFI.
3. Any cause similar to the above, not resulting solely due to defective material and/or workmanship.
LIMITATION OF WARRANTIES AND REMEDIES
THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED IN LIEU OF ANY
AND ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, AND ANY
OBLIGATION, LIABILITY, RIGHT, CLAIM, OR REMEDY IN CONTRACT OR TORT, WHETHER OR NOT
ARISING FROM HEAT-FLO, INC.’S NEGLIGENCE, ACTUAL OR IMPUTED.
THE REMEDIES OF THE ORIGINAL CONSUMER PURCHASES SHALL BE LIMITED TO THOSE
PROVIDED HEREIN TO THE EXCLUSION OF ANY OTHER REMEDIES INCLUDING WITHOUT
LIMITATION, INCIDENTAL OR CONSEQUENTIAL DAMAGES INCLUDING, BUT NOT LIMITED TO,
PROPERTY DAMAGE, LOST PROFIT, OR DAMAGES ALLEGED TO HAVE BEEN CAUSED BY ANY
FAILURE OF HEAT-FLO, INC. TO MEET ANY OBLIGATION UNDER THIS AGREEMENT INCLUDING THE
OBLIGATION TO REPAIR AND REPLACE SET FORTH ABOVE.
NO AGREEMENT VARYING OR EXTENDING THE FOREGOING WARRANTIES, REMEDIES, OR THIS
LIMITATION WILL BE BINDING UPON HEAT-FLO, INC. UNLESS IN WRITING AND SIGNED BY A DULY
AUTHORIZED OFFICER OF HEAT-FLO, INC.
THE WARRANTY STATED HEREIN IS NOT TRANSFERABLE AND SHALL BE FOR THE BENEFIT OF THE
ORIGINAL CONSUMER PURCHASER OF A TANK ONLY. THE WARRANTY IS LIMITED TO ONE
REPLACEMENT PER SITE.
These warranties give you specific legal rights, and you may also have other rights which may vary from state to state.
Some states do not allow the exclusion or limitation of incidental or consequential damages so this limitation or
exclusion may not apply to you.
These are the only written warranties applicable to tanks manufactured and sold by Heat-flo, Inc. Heat-flo, Inc.
neither assumes nor authorizes anyone to assume for it any other obligation or liability in connection with said tanks
.
SERVICE REQUESTS
FOR SERVICE UNDER THESE WARRANTIES CONTACT HEAT-FLO, INC., AT THIS ADDRESS:
Heat-flo, Inc., P.O. Box 612, Uxbridge, MA 01569 USA
At the time a claim is filed the original purchaser must present a copy of the original sales receipt, and a deed, utility bill, or equivalent document
evidencing both ownership of the tank and installation in the dwelling or commercial property owned by the original consumer purchaser. With
regard to claims made by original consumer purchasers of tanks used in commercial settings as that term is defined herein, in no event shall
notification of a service request be received later than five years from the date of purchase.
The obligations under this warranty apply only to tank installations where the warranty registration card has been completed by the owner of the
site of the original installation and received by Heat-flo in accordance with the terms and conditions herein set out and Heat-flo has been notified
of the alleged defect or deficiency within forty-eight (48) hours from the occurrence or discovery of the alleged defect or deficiency.
Heat-flo, Inc. reserves the right to change specifications or discontinue models without notice.

Heat-flo, Inc.
15 Megan Ct.
P.O. Box 612
Uxbridge, MA 01569
| Tel: [phone] |Email: [email protected]| Fax: [phone] |
www.heat-flo.com