Takagi T-H3J-DV / 240H Installation Manual And Owner's Manual page 35

(Domestic and Space Heating):
Diagramatic layout of Radiant Heating and Domestic Water Heater.
Automatic tempering device
must be installed below the
top of the water heater as per
manufacturer's recommendations
Tempered water to plumbing
fixtures. Follow local code
Piping loop
between water
heater and fan
coil
Thermostatic mixing valve
Heating Coil
(used with air-handler)
System installed with reverse acting
aquastat to shut off fan.
50'-0" maximum distance from water
heater to fan coil (Developed length) Not
including coil in heating unit
The recirculation pump is to provide no less than 7.5 L/min (2 GPM (US))
and no more than 15 L/min (4 GPM (US)) through each activated unit in the system.
NOTICE
• 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. 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.
-Dual-purpose hot water heating-
(Domestic and Space Heating):
Cold water supply
Apply correct thermal
Shut-off
expansion tank-size per
valve
application
Pressure
gauge
Check valves
Shut-off valves
Shut-off valves
Check valve
T
NSF-61 product
approved pump
Electronically controlled pump timer.
Activates every 6 hours for 60 seconds.
Wire to product approved pump.
35
Check valve will have
1/8" hole drilling in
clapper optional
P
Atmospheric
vacuum breaker
Drain
Hot water plug
supply and
return to
heating coil
T-handle gas shut-off valve
An approved temperature and pressure relied valve,
tie to location approved by local codes and Must
meet BTU rating of water heater model used
Page
4" gas exhaust vent
(Discharge must comply
with local and state codes).
Cannot be common vented
with other appliances
Unions
Water
filter
120 VAC
switch or
outlet