08040169 MISC Takagi USA Tankless Water Heaters,CorrmTercial Gas Water Heater http://www.takagi.c ?p=installation regtlirements.php&page_id=66
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Professionals Installation Requirements
Overview The fallowing Requirements must be adhered to when planning for and Installing.a Takagi
Contractor Training tankless water heater.Failure to do so could result In Improper operation,shortened unit life, Newsletter
Product Manuals voiding the warranty and/or a compromise In safety.
Product Spec.Sheets For the latest news and updates.
Information and Guidelines such as water connections,temperature settings,recirculation please sign rpmrourquarterly
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Troubleshooting&Repali
o Requirement#1:Gas Supply
Installation Requirements enter small address
Sizing
Commercial Applications J Gas Meter Size:The larger BTU input of a tankless water heater may tunsuascmBEI
necessitate the Installation of a larger meter.Check with the local utility.
Media i(II
Digital Catalogs ✓ Gas Line Size:All Takagi heaters have 3k Inch NPT connections.Gas line Press Release
shall be a minimum of 3A Inch inside diameter pipe.Gas lines shall be
sized to allow for maximum BTU/hr Input of said heater at the specified Inlet Five of TakagPs Highly Effkient
pressure.These specifications can be found in the Installation manual or on Tankless water Heaters Receive
the rating plate located on the front cover of the heater.Please use the follow ENERGY STAR status...
the standard set forth by the"American Gas Association.' mad more—
Takagi Opens satellite Office in
✓ Gas Pressure:The minimum natural gas pressure at the unit should be a Oda.-Fort Worth Area..
maximum 5.5 Inches of water column,with a maximum of 10.5 Inches.For read more»
liquid propane,the minimum Is 11 Inches and 14 Inches maximum.Refer to Godo spmypAmenca Feames
the Installation manual for proper specification or list the specs for every Takagi_....
heater. read more»
✓ Gas Connection to the Heater:This can be done with hard pipe or with
flexible line that Is made specifically for gas.Please check your local codes.
This piping MUST be no smaller than 3A Inch INSIDE Diameter.Just because a
Ilex Ione uses Inch connections doesn't mean that actually measure V.
, a
Inch on the Insisi h de.In fact,most are' Inch to 5/8 Inch I.D.and will not �
supply enough gas to operate a tankless heater properly. '
✓ Gas Valve:High quality full port gas shutoff valve shall be installed per Takagi Is an Otadal ENERGY STAR
National/Local codes.Note:Some ball valves significantly reduce the diameter
PARTNER Water
e the Program W
of the pipe and should therefore be avoided If possible.
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o Requirement#2:Venting
✓ Intake Supply(Combustion Air):On the direct vent models,which draw
the combustion air they need"directly'from the outside,the pipe diameter Is
3 Inches.This material is usually made of PVC,although galvanized steel
(S-vent)and aluminum may also be used.Do not Install a non-direct vent
model,such as the T-Ml where there Is an Inadequate supply of combustion
air to the heater area.Sizing for combustion air Indoors shall follow the NFPA
54 code.
✓ Exhaust Vent:All Takagi water heaters are Category III appliances,and
therefore MUST be vented with Category III stainless steel,four Inch
diameter,exhaust gas vent pipe made especially for Category III appliances
(the exception Is the T-H1,which Is a Category IV unit and uses a vent pipe
approved for Category III appliances).The Category III pipe,which Is
available from several manufacturers,Is called a'BH'vent pipe In Canada.
Using another material,such as common 8-vent,will damage the heater,
possibly resulting In carbon monoxide poisoning.The entire exhaust vent
must be sealed-from the top of the heater to the terminator.This Is done by
the high-temperature seals and locking devices built Into the Category III
approved vent pipe.
J General Rules for Venting:
1. For best results,try to keep the vent system as short and
straight as possible.
2. The vent pipe should be removable from the top of the heater for
Inspection and possible servicing of the unit.
3. The heater MUST NOT be common-vented with any other gas
appliance or vent stack.
4. Do not upsize(oversize)the vent pipe.It must be 4 Inches in
diameter for the entire run.
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5. For horizontal runs,either a)slope the pipe upwards from the
heater at a rate of'A Indy per foot and Install a condensation
drain;or b)slope It down and away from the heater at the same
rate(25),so that the condensate will drain out.
For any runs that are at a significant slope up to vertical and over
5 feet In length,always use a condensation drain to protect the
heat exchanger,especially In cold weather.Refer to the
manufacturers Instructions for proper Installation.
o Guidelines
./ Water Connections-Pipe Sizing:The connections on the heater are V4 Inch
NPT.Takagi specifies minimum 314 Inch piping to and from the heater.Using
pipe smaller that?4 Inch will create flow and temperature fluctuations.
J Reminder.Currently the T-K3 and the T-Ml are the only heaters that should
be connected In parallel to Increase flow rate.Installing any other model In
parallel will result in unsatisfactory performance In most cases.
When connecting multiple T-K3 or T-M3 units together,Install a check valve
on each hot-water-out pipe.High quality,full port ball valves should be used
on the hat and cold lines for servicing purposes.You may also want to install
Isolation valves for future servicing purposes.
You must also determine the correct header size,based on the number of
tankiess units Installed.A general rule of thumb to use 1%Inch pipe for 1 to 4
heaters; 11h Inch pipe for 5 to 10 heaters;and 2 Inch pipe for up to 20
heaters.
./ Electrical Supply:All units run on 120 VAC 60 Hz,and draw no more power
than about 92 watts or 0.92 amps.A dedicated circuit or GFCI is not needed
unless dictated by local code.Units can be simply plugged Into an outlet with
an AC power cord(not suggested)or hard-wired.We suggest using and off/on
switch In the latter case.A simple light switch will work.
o Requirements
Mounting the Units:All of Takagi's current water heaters shall be wall
mounted.The wall mounting brackets are attached to the heaters at the
factory.Takagi water heaters are typically wall-mounted to save floor space
r for the end-user.Wall-mounting also makes it easier for the contractor to
Install and service.From the back of the unit,there Is a 1-Inch clearance to
combustible surfaces and a zero-Inch clearance for non-combustible surfaces.
• The T-H1,T-M1,T-K3,T-M199,and the T-K Jr.models come with a
factory-installed mounting bracket.
J Freeze Protection:Takagi has Installed freeze-protection devices to help
guard against permanent damage to the heat exchanger In the event of
below-freezing temperatures.Although these devices will attempt to protect
the unit,there Is no guarantee that they always will,such as In the case of
power loss to the unit.This type of damage Is not covered under warranty,so
great care should be taken to avoid freezing conditions.
Each unit has a freeze-protection sensor mounted to the fan.It senses the
Incoming or ambient temperature.When the temperature drops below 37°F,
the unit will tum on ceramic heaters located around the heat exchanger and
water lines.Again-any type of power failure would cause this system not to
work.
In freezing climates where the unit Is Installed Inside,Takagi recommends
that the freeze protection sensor be relocated outside If possible or at least
attached to a surface that more accurately reflects the temperature of the
Incoming air.An extension cable Is provided with each unit for this purpose.
In addition to the sensor,the backflow preventer(Part No.TV-TV03)MUST be
Installed wherever air at below-freezing temperatures may be drawn down the
exhaust pipe Into the heater a backflow preventer used by the venting
manufacturer Is acceptable.This device shall be Installed on top of the heater.
Although the backflow preventer helps to limit the flow of freezing air,It does
not block all of It.In very cold climates,care must be taken to Insure power to
the unit,and to eliminate any negative air pressure conditions In the building
that would promote cold-air flow In the heater.If this cannot be avoided,the
unit should be thoroughly drained to prevent damage.
J Pressure Relief Valve:A"pressure only'relief valve shall be installed
according to national/state/local codes.A temperature&pressure relief valve
Is not required unless required by applicable codes.
Temperature Settings:All heaters come preset with a default setting of
122°F(Our T-K3 has a total of 8 settings).This temperature may be changed
to three other settings via dipswitches located on the computer boards.Please
see service manuals or the Takagi Tankless Translator for these settings.
Please note that studies have found that 122"F Is the Ideal temperature for
most residential and many commercial applications.Try to avoid the old"tank
habit"of raising the temperature to'get more hot water."This will,in fact,
produce a lesser volume of hot water than leaving It at Its default setting.
The heaters may also be set to 17 different temperatures,using the
appropriate Remote Control,depending on the heater model.See the Product
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Takagi USA Tankless Water Heaters,Commercial Gas Water Heater http://www.takagi.com/?p=installation requirerrents.php&page_id=66
r
Descriptions or Accessories page to find out the right Controller for your
specific unit.
J Outdoor Switch:Make sure this switch Is set correctly for your heater's
location.The default setting for every Takagi unit Is"Indoor".
./ Recirculation Systems:Tankless water heaters may be used with hot water
recirculation systems.Tankless water heaters provide a continuous flow of
water at a consistent temperature.They do not provide"Instant"hot water,
despite"aggressive advertising"and wishful thinking.Just as a conventional
water heating system must move the hot water from the tank to the fixture or
appliance-which takes time-so does a tankless system.In fact,a tankless
system may take a few seconds more to tum on and heat the water.This,
however,Is a small price to pay for Its benefits.
o There are wrong ways to Install a"recirc"
J Wrong Way No.1:Install a pump that is either too small,such as what was
used on the previous tank-type heater;or one that Is too large,such as what
may have been recommended to"cover all the bases.""Generally,If the
pump is sized too small,it will not provide enough flow to activate a Takagi
tankless heater.This Is especially true if the return piping Is small or is an
extended line with several elbows."Takagi requires a minimum high head
1/12 hp pump.
J Wrong Way No.2:'Install a high head pump that Is too large."such as a
We specify a minimum 1/12 hp pump.
This will provide enough flow to tum the heater on,but may also cause
unnecessary wear on all the pipes,valves and heat exchanger.It will also
waste energy.This size pump would be required,however,In a large house
with long runs or with a small return pipe.
The Right Way:Use engineering formulas to estimate-as closely as possible-the
approximate dynamic head loss through the recirculation loop.Then choose the correct pump
from manufacturer's data,based on flow rate at a certain head.
If these formulas are not practical,try to estimate the size of your return line run.How long
and how large of a pipe run is It?In general,a long run with many elbows and a small
diameter(1h Inch,for example)will require a larger pump to draw the water back to the unit.
You should be looking for approximately 1 to 2 GPM of flow for most domestic hot water
recirculation systems.This should be enough to tum the unit on reliably and not cause
premature wear or energy waste.Use a Takagi remote to determine the flow rate,which can
be adjusted using a ball valve on the first pump or the three-speed switch on the second.
Comparable pumps by other manufacturers would be a Taco 003-BC-1 for the 15-42,or a
Taco 009-BF5 for the 26-96,or equal.
Having"Instant hot water"at the faucet is a wonderful benefit,bit it can also be a costly one
and actually defeat the purpose of tankless water heating,which Is to save energy and
money.Make sure you Install an aquastat(a thermostat for water)and a timer on the pump
to limit activation frequency and duration.
For example,the timer may be set to early morning(before showers)and aftemoon/evening
hours.Also,If at all possible,Install insulation on the supply and return lines to avoid heat
loss.
One system that performs well with tankless is a Metlund D'MAND System:the 5-70T-PF-R,
for small homes and the S-02T-PF-R for larger residences.Neither model needs a separate
return line,because they use the existing cold-water line to return the water from the
farthest fixture.Consult the manufacturer for more details.
Clean Water Filter After Initial Run:There Is a small screen filter on the cold-water Input
connector of each heater.After running the heater for five minutes during setup,tum off the
water supply and remove this screen to check for debris.Some screens may be removed
easily with a half-Inch copper pipe wire brush.You may choose to install an extra cartridge
filter on the heater's cold supply to avoid problems with small filter dogging prematurely.
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