System Water Piping Methods - Weil-McLain ECO 70 Manual

TM -
G
AS FIRED WATER BOILER
Direct Connect System Piping

System water piping methods

1. See Figure 43 for the head loss through the boiler.
Use boiler head loss values to size pump after determining
other piping head loss values.
1. Install a system circulator as shown in the piping diagram in
the Direct Connect System Piping section on page 41.
2. This circulator must be supplied by the installer.
1. Size circulators based on the flow rate required to achieve the
temperature rise or drop.
2. You can closely estimate the required flow through a circuit
by using the following formula, where TD is temperature rise
(or drop), FLOW is flow rate (in gpm), and BTUH is the heat
load for the circuit:
=
:
1. Consider a system loop for a system with total heating input
equal to 210,000 Btuh. The desired temperature drop through
the system piping is 20°F. Then the required flow rate is:
=
1. The circulator must be capable of delivering the required
flow against the head loss that will occur in the boiler piping.
2. Determine the pipe size needed and the resultant head loss
using accepted engineering methods.
Part number 550-142-122/0513
— Boiler Manual
BTUH
=
(continued)
39