Installation
24
│
Page
‐
Dual
‐
purpose
hot
water
heating
‐
(Domestic
and
Space
Heating):
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
The
circulation
pump
is
to
provide
no
less
than
2
GPM
and
no
more
than
4
GPM
through
each
activated
unit
in
the
system.
All
water
piping
should
be
insulated
in
accordance
with
780
CMR
(Massachusetts
energy
code)
Hot
water
supply
and
return
to
heating
coil
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
An
approved
Temperature
and
Pressure
Relied
Valve,
Tie
to
Location
approved
By
Local
Codes
and
Must
Meet
BTU
Rating
of
water
heater
Model
Used
Cold
water
supply
Tempered
water
to
plumbing
fixtures.
Must
meet
temperature
requirements
of
248
CMR
Automatic
tempering
device
must
be
installed
below
the
top
of
the
water
heater
as
per
manufacturer’s
recommendations
System
installed
with
reverse
acting
aquastat
to
shut
off
fan.
Suggested
but
not
required
by
248
CMR
NSF
‐
61
product
approved
pump
Electronically
controlled pump
timer.
Activates
every
6
hours
for
60
seconds.
Wire
to
product
approved
pump
Check
valve
with
1/8”
hole
drilling
in
clapper
optional
50’
‐
0”
maximum
distance
from
water
heater
to
fan
coil
and
black.
(Develoed
length)
Not
including
coil
in
heating
unit
Piping
loop
between
water
heater
and
fan
coil
shall
be
in
compliance
with
248
CMR
Содержание 115
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