Installation
29│Page
‐Dual‐purposehotwaterheating‐
(DomesticandSpaceHeating):
• PriorityControlDevicessuchasaflowswitch,anAquastatorotherelectronic
controllercanbeused toprioritizethedomesticwatersystemoverthehea ting
system.
• Followalllocalcodes,orintheabsenceoflocalcodes,followthemostrecent
editionoftheNationalStandardCode,ANSI
Z21.10.3.
• Thisillustrationisaconceptdesignonly.Thereferencetothe1/8
th
holeincheck
isonlyfortheStateofMassachusetts.Thereareawidevarietyofvariationsto
theapplicationofcontrolsandequipmentpresented.Designersmustaddall
necessarysafetyandauxiliaryequipmenttoconformtocoderequirementsand
designpractice.Formoredetails,contactthemanufacturer.
NOTICE
*Thecirculationpumpistoprovidenolessthan2GPMandnomorethan4GPMthroughea
hactivated
unitinthesystem.
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
**Maximumallowable
distanceof50ft.from
waterheaterand
heatingpanel
AnapprovedPressureOnlyRelied
Valve,TietoLocationapprovedBy
LocalCodesandMustMeetBTU
RatingofwaterheaterModelUsed
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