Weil-McLain ULTRA Oil 3 Series Manual page 16

Series 3
Connect water piping
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 requirements.
b. Remove circulator (when furnished as standard equip-
ment). See Replacement Parts page 36 for circulator
replacemnt part numbers.
c. Install balancing valves to adjust flow to distribute heat
to all zones.
d. Separate relay is required for each circulator.
Figure 8 Multiple zoning with circulators –
Temperatures 140 °F and higher
Zone 2
Zone 1
1
2
1
5
UO014
16
water boiler — Boiler Manual
(continued)
3. Zoning with zone valves (Figure 9)
a. Install balancing valves to adjust flow to distribute
b. Separate transformer is required to power zone valves.
Figure 9
1
2
3
1
5
UO015
1 Isolation valve
2 Flow control valve
3 Circulator
heat to all zones.
Refer to "Weil-McLain Zone Valve Wiring
Guide" for details.
Multiple zoning with zone valves –
Temperatures 140 °F and higher
Zone 2
Zone 1
1
1
5
4 Zone valve
5 Drain valve
1
4
1
5
3
Part number 550-143-013/0621