41
Page
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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.
ͻ
Follow all local codes, or in the absence of local codes, follow the current
ĞĚŝƚŝŽŶŽĨƚŚĞEĂƚŝŽŶĂů^ƚĂŶĚĂƌĚŽĚĞ͕E^/Ϯϭ͘ϭϬ͘ϯͻ^ϰ͘ϯ͘
ͻ
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 w
at
er outlet
Unions
dͲŚĂŶĚůĞŐĂƐƐŚƵƚŽīǀĂůǀĞ
Check valve
Electronically controlled
ƉƵŵƉƟŵĞƌ͘ĐƟǀĂƚĞƐ
every 6 hours for 60
seconds. Wire to
product approved pump
,ĞĂƟŶŐŽŝů
(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
ƌĞůŝĞĨǀĂůǀĞ͘dŝĞƚŽůŽĐĂƟŽŶĂƉƉƌŽǀĞĚďLJ
ůŽĐĂůĐŽĚĞƐĂŶĚŵƵƐƚŵĞĞƚdhƌĂƟŶŐŽĨ
water heater model used
Check valve will have
1/8-inch hole drilling
ŝŶĐůĂƉƉĞƌŽƉƟŽŶĂů
Atmospheric
vacuum
breaker
^ŚƵƚŽī
valve
Pressure
gauge
Apply correct thermal
expansion tank-size
ƉĞƌĂƉƉůŝĐĂƟŽŶ
^ŚƵƚŽīǀĂůǀĞƐ
^ŚƵƚŽīǀĂůǀĞƐ
Check valves
Cold w
at
er inlet
Gas inlet
Water
ĮůƚĞƌ
Drain
plug
dŚĞƌŵŽƐƚĂƟĐŵŝdžŝŶŐǀĂůǀĞ
Hot water
supply and
return to
ŚĞĂƟŶŐĐŽŝů
System installed with reverse
ĂĐƟŶŐĂƋƵĂƐƚĂƚƚŽƐŚƵƚŽīĨĂŶ͘
Suggested but not required by
248 CMR
50’-0” maximum distance from
water heater to fan coil.
(Developed length) Not including
ĐŽŝůŝŶŚĞĂƟŶŐƵŶŝƚ
NSF-61 product
approved pump
ƵƚŽŵĂƟĐƚĞŵƉĞƌŝŶŐĚĞǀŝĐĞ
must be installed below
the top of the water heater
as per manufacturer’s
ƌĞĐŽŵŵĞŶĚĂƟŽŶƐ
Piping loop
between water
heater and fan
coil shall be in
compliance with
248 CMR
Tempered water to
ƉůƵŵďŝŶŐĮdžƚƵƌĞƐ͘DƵƐƚ
meet temperature
requirements of 248 CMR
All water piping should be insulated
in accordance with 780 CMR
;DĂƐƐĂĐŚƵƐĞƩƐĞŶĞƌŐLJĐŽĚĞͿ
ͲƵĂůͲƉƵƌƉŽƐĞŚŽƚǁĂƚĞƌŚĞĂƟŶŐͲ
;ŽŵĞƐƚŝĐĂŶĚ^ƉĂĐĞ,ĞĂƚŝŶŐͿ͗
Diagrammatic layout of radiant heating and domestic water heater.
dŚĞƌĞĐŝƌĐƵůĂƚŝŽŶƉƵŵƉŝƐƚŽƉƌŽǀŝĚĞŶŽůĞƐƐƚŚĂŶϮ'WD;ϳ͘ϱ>ͬŵŝŶͿĂŶĚŶŽŵŽƌĞƚŚĂŶϰ'WD;ϭϱ>ͬŵŝŶͿ
ƚŚƌŽƵŐŚĞĂĐŚĂĐƚŝǀĂƚĞĚƵŶŝƚŝŶƚŚĞƐLJƐƚĞŵ
/ŶƐƚĂůůĂƟŽŶ
/ŶƐƚĂůůĂƟŽŶDĂŶƵĂů
Ball
Valve
Isolation
Valve
Printed on 12/6/2017 8:34 AM CT
