Takagi T-H3M-DV - Dual-purpose hot water heating

30 Page
• Priority Control Devices such as a flow switch, an Aquastat or other
electronic controller can be used to prioritize the domestic water system over
the heating system.
• Follow all local codes, or in the absence of local codes, follow the most recent
edition of the National Standard Code, ANSI Z21.10.3.
• This illustration is a concept design only. The reference to the 1/8
th
hole
in check is only for the State of Massachusetts. There are a wide variety
of variations to the application of controls and equipment presented.
Designers must add all necessary safety and auxiliary equipment to conform
to code requirements and design practice. For more details, contact the
manufacturer.
NOTICE
120 VAC
switch or
outlet
Hot water outlet
Unions
T-handlegasshutovalve
Check valve
Electronically controlled
pumpmer.Acvates
every 6 hours for 60
seconds. Wire to
product approved pump
HeangCoil
(used with air-handler)
Cold water supply
3-inch gas exhaust
vent (Discharge must
comply with local and
state codes.) Cannot
be common vented
with other appliances
An approved temperature and pressure
reliefvalve.Tietolocaonapprovedby
localcodesandmustmeetBTUrangof
water heater model used
Check valve will have
1/8-inch hole drilling
inclapperoponal
Atmospheric
vacuum
breaker
Shuto
valve
Pressure
gauge
Apply correct thermal
expansion tank-size
perapplicaon
Shutovalves
Shutovalves
Check valves
Cold water inlet
Gas inlet
Water
lter
Drain
plug
Thermostacmixingvalve
Hot water
supply and
return to
heangcoil
System installed with reverse
acngaquastattoshutofan.
Suggested but not required by
248 CMR
50’-0” maximum distance from
water heater to fan coil.
(Developed length) Not including
coilinheangunit
NSF-61 product
approved pump
Automactemperingdevice
must be installed below
the top of the water heater
as per manufacturer’s
recommendaons
Piping loop
between water
heater and fan
coil shall be in
compliance with
248 CMR
Tempered water to
plumbingxtures.Must
meet temperature
requirements of 248 CMR
All water piping should be insulated
in accordance with 780 CMR
(Massachusesenergycode)
-Dual-purpose hot water heang-
(Domestic and Space Heating):
Diagrammatic layout of radiant heating and domestic water heater per mass. code.
The recirculation pump is to provide no less than 2 GPM (7.5 L/min) and no more than 4 GPM (15 L/min)
through each activated unit in the system.
Installaon
Installaon Manual
Ball
Valve
Isolation
Valve