lp-445-r4 Rev. 006 Rel. 027 Date 7.21.20
19
O. Applications*
*NOTE:
Systems shown are primary/
secondary piping systems. These
recommended systems have a
primary (boiler) loop, and secondary
circuits for heating. The primary
loop and secondary circuits have
separate circulators. The use of other
near boiler piping configurations
could result in improper flow rates,
leading to inadvertent boiler high
limit shutdowns and poor system
performance.
NOTE:
In piping applications utilizing
a single zone, it is recommended
that the installer use flow / check
valves with weighted seats at or near
the appliance to prevent gravity
circulation.
FIGURE NOTES:
1. This drawing is meant to
demonstrate system piping concept
only.
2. A mixing valve is recommended if
the DHW temperature is set above
the factory setting of 119
o
F.
3. Install a minimum of 12 diameters
of straight pipe upstream of all
circulators.
4. Install a minimum of 6 diameters of
straight pipe up and downstream of
all closely spaced tees.
5. Piping shown is Primary/
Secondary.
6. The minimum pipe size for
connecting an HTP indirect fired
water heater is 1”.
7. The minimum pipe size for
connecting a Mod Con boiler is 2”.
8. System flow (Secondary Loop)
must be greater than the boiler’s
Primary Loop flow.
9. Installations must comply with all
local codes.
10. In Massachusetts, a vacuum relief
valve must be installed on the cold
water line per 248 CMR.
11. See Multiple Boiler Manifold
Piping chart, this manual, when
sizing and installing a multiple boiler
system.
The piping will not support the weight of the circulators. Refer to the circulator manufacturer’s instructions to properly support the circulator.
Failure to comply with these instructions could result in property damage, severe personal injury, or death.
An ASSE 1017 thermostatic mixing valve is recommended on all indirect water heaters if the hot water temperature leaving the heater is
above 119
o
F. Failure to do so could result in substantial property damage, serious injury, or death.
Figure 6 - Single Boiler Space Heating with Indirect Priority
Figure 7 - Cascaded Boilers with Indirect Priority on One
Содержание MODCON500 FS
Страница 34: ...lp 445 r4 Rev 006 Rel 027 Date 7 21 20 34 Figure 26 Cascade Master and Follower Wiring ...
Страница 61: ...lp 445 r4 Rev 006 Rel 027 Date 7 21 20 61 Figure 34 Water Side Replacement Parts All Models ...
Страница 62: ...lp 445 r4 Rev 006 Rel 027 Date 7 21 20 62 Figure 35 Cabinet Replacement Parts All Models See Table ...
Страница 65: ...lp 445 r4 Rev 006 Rel 027 Date 7 21 20 65 Maintenance Notes ...
