System Water Piping Methods - Weil-McLain Ultra Commercial Installation And Start-Up Manual

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Install water piping

System water piping methods

All piping methods shown in this manual use
designs ensure proper flow through the Ultra boiler, for
the most efficient and reliable operation of the boiler and
the heating system. For other piping methods, consult
your local Weil-McLain representative or see separate
Ultra boiler piping guides.
Recommended pipe sizing
Connect minimum 2" pipe to the supply and return connections
Ultra-550 and Ultra-750 boilers.
Size the piping and the boiler circulator to provide the required tem-
perature rise through the boiler loop. See Figure 6 for the head loss
through the boiler and minimum/maximum flow rates.
design the piping and components for a boiler
loop flow rate above or below the range given in Figure 6.
Insufficient flow will cause nuisance outages due to limit
operation. Excessive flow can damage to the boiler heat
exchanger from erosion.
Circulators
The boiler circulator must be supplied by others. Locate the boiler
circulator in the return piping, as shown in the appropriate piping
diagram in this manual.
use the boiler circulator in any location other
than the ones shown in this manual. The boiler circula-
tor must be selected to ensure adequate flow through the
Ultra boiler.
Install the boiler circulator only on the boiler return pip-
ing. This ensures the pressure drop through the boiler
will not cause low pressure in the circulator intake.
Failure to comply could result in unreliable performance
and nuisance shutdowns from insufficient flow.
A Taco model 1400-50 (or 2400-50) or equivalent will work for most
boiler loop circulator applications.
14
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FIRED WATER BOILER
(continued)
. These
— Boiler Manual
Boiler head loss vs flow rate for Ultra-550
& Ultra-750
Temp. Boiler head loss
GPM
Rise °F Feet w.c.
25 41.0 6.3
30 34.1 8.1
35
40 25.6 12.5
45 22.8 15.1
50 20.5 18.1
55
18.6 21.3
DO NOT design for flow rates
above or below the range listed
above.
* Suggested design flow rates (30°F temperature rise)
Temp. Boiler head loss
GPM
Rise °F Feet w.c.
30 46.4 6.3
35 39.8 7.6
40
34.8 9.2
45
50 27.8 13.0
55 25.3 15.3
60
23.2 17.9
65
21.4 20.7
70 19.9 23.6
DO NOT design for flow rates
above or below the range listed
above.
Part number 550-100-086/0809