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3YSTEMCIRCULATORSANDZONECIRCULATORS
1. Install a system circulator or zone circulators as shown
in the piping diagrams in the Primary/Secondary System
Piping section in this manual. These circulators must be
supplied by the installer.
3YSTEMORZONECIRCULATORSmOWRATES
1. Size circulators based on the flow rate required to achieve
the temperature change you needed. You can closely esti-
mate temperature rise (or drop) 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:
&,/7 =
BTUH
nnnn
4$X
%XAMPLES:
1. Consider a system loop for a system with total heating
load equal to 210,000 Btuh. The desired temperature drop
through the system piping is 20°F. Then the required flow
rate is:
&,/7 =
nnnn
X
= GPM
3)-0,)&)%$
&ORTEMPERATUREDROP&,/7-"(
3YSTEMORZONECIRCULATORHEADREQUIREMENT
1. The circulator must be capable of delivering the required
flow against the head loss that will occur in the piping.
2. Determine the pipe size needed and the resultant head loss
using accepted engineering methods.
Part number 550-142-122/0513
45
TM
GAS-FIRED WATER BOILER — Boiler Manual
Primary/Secondary System piping (continued)
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