Dual-Purpose Hot Water Heating - American Water Heater 520 Installation Manual And Owner's Manual

Thermostatic Mixing Valve
Heating Coil
(used with air-handler)
**Maximum allowable distance of
50-Ft. from water heater and
heating panel
* The circulation pump is to provide no less than 2 GPM and no more than 4 GPM through each activated
water heater 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
WARNING
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.

-Dual-purpose hot water heating-

(Domestic and Space Heating):
Diagramatic Layout of Radiant Heating and
Domestic Water Heater Per Mass. Code
Apply Correct
Thermal
Expansion
Tank-Size Per
Application
Pressure
Gauge
Tempered
Water To
House
Thermometer
Thermometer
T
Check
Valves
Shut-Off
Valves
Pump (Must Be Sized Properly
With Each Application). Pump
Shall Run 60 Seconds Every 6
Hours
33
Cold Inlet
Check Valve Will
Have 1/8" Hole in
Shut-Off
Check, As Per
Valve
Mass. Code
Atmospheric
Vacuum Breaker
P
Drain
Plug
Check Valve
T-Handle Gas
Shut-Off Valve
│
Page
Applications
An approved Pressure Only Relied
An approved Pressure Only
Valve, Tie to Location approved By
Relief Valve, Tie to Location
approved by Local Codes and
Local Codes and Must Meet BTU
Must Meet BTU Rating of Takagi
Rating of water heater Model Used
Model Used
4" Gas Exhaust Vent (Discharge
Must Comply with Local and
State Codes). Can Not Be
Common Vented with Other
Appliances
Takagi
Hot Cold
Water Water Gas
Outlet Inlet Inlet
Water
Filter
120 VAC Switch or Outlet
Unions
th
hole in check