®
Series 3
WATER
BOILER
— Boiler Manual
Connect water piping
(continued)
Piping MULTIPLE ZONES — System temperature 140 °F or higher
1. Follow instructions on page 14 and 15 to install
piping near boiler.
2. Zoning with circulators (Figure 8)
a. Size each circulator to individual circuit require-
ments.
b. Remove circulator (when furnished as standard equip-
ment).
c. Install balancing valves to adjust fl ow to distribute heat
to all zones.
Figure 8
Multiple zoning with circulators –
Temperatures 140 °F and higher
Figure 9
Multiple zoning with zone valves –
Temperatures 140 °F and higher
d. Separate relay is required for each circulator.
3. Zoning with zone valves (Figure 9)
a. Install balancing valves to adjust fl ow to distribute
heat to all zones.
b. Separate transformer is required to power zone valves.
Refer to “Weil-McLain Zone Valve Wiring
Guide” for details.
Zone 1
Zone 2
1
1
4
1
5
1
5
UO015
3
Zone 1
Zone 2
1
1
2
2
3
1
5
1
5
UO014
1 Isolation
valve
2
Flow control valve
3 Circulator
4 Zone
valve
5 Drain
valve
Part number 550-142-182/1014
16
