Applications
33
│
Page
‐
Dual
‐
purpose
hot
water
heating
‐
(Domestic
and
Space
Heating):
Takagi
P
T
An approved Pressure Only
Relief Valve, Tie to Location
approved by Local Codes and
Must Meet BTU Rating of Takagi
Model Used
Unions
4" Gas Exhaust Vent (Discharge
Must Comply with Local and
State Codes). Can Not Be
Common Vented with Other
Appliances
Atmospheric
Vacuum Breaker
Pump (Must Be Sized Properly
With Each Application). Pump
Shall Run 60 Seconds Every 6
Hours
Pressure
Gauge
Apply Correct
Thermal
Expansion
Tank-Size Per
Application
Tempered
Water To
House
Cold Inlet
Shut-Off
Valve
Check Valve Will
Have 1/8" Hole in
Check, As Per
Mass. Code
Thermometer
Thermostatic Mixing Valve
Shut-Off
Valves
Check Valve
Hot
Water
Outlet
Cold
Water
Inlet
T-Handle Gas
Shut-Off Valve
**Maximum allowable distance of
50-Ft. from water heater and
heating panel
Heating Coil
(used with air-handler)
Diagramatic Layout of Radiant Heating and
Domestic Water Heater Per Mass. Code
Thermometer
Check
Valves
Gas
Inlet
Drain
Plug
Water
Filter
120 VAC Switch or Outlet
*
The
circulation
pump
is
to
provide
no
less
than
2
GPM
through each
activated
Takagi
unit
in
the
system.
•
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
TAKAGI.
WARNING
