Crown Boiler 24-07 - Manual (Page 80)

80
A6. T
ankless
Application Only with RTC – NO Building Heat; with and without storage tank (MECHANICAL)
NOTES: 1)
Install the boiler as indicated above for systems where the boiler return temperatures may be less than 135F and heating DHW with a tankless coil.
2)
The boiler circulator must be sized using the sizing charts found in
Appendix B.
3)
The return sensor
, S1, shall be installed at the return of the boiler
.
The boiler circulator may be located anywhere within the recirculation loop.
4)
The balancing valve in the boiler return line, V1, may be necessary in low head by-pass loop applications.
5)
Domestic Hot W
ater must be tempered for safe usage.
The tankless aquastat and/or a storage tank aquastat (A1) are normally closed switches. Circuit
breaks on temperature rise.
6)
Expansion tanks, air scoops and other components left out for clarity
.
7)
Observe all applicable plumbing and electrical codes.
This diagram is for reference only
. The installer or designer is responsible for the proper selection and design of the
system.