Weil-McLain 550-141-826/1201 - Manual (Page 20)

SERVICE TECHNICIAN ONLY — read and follow completely.
Zone 2
Zone 1
1
2
5 5
1
2
1
3
1
Piping MULTIPLE ZONES
1. Follow instructions on page 18 and page 19 to
install piping near boiler.
2. See Figure 11 or Figure 12 to complete installation
3. Zoning with circulators:
a. Size each circulator to individual circuit re-
quirements.
b. Remove circulator (when furnished as standard
equipment).
c. Install balancing valves to adjust flow to distrib-
ute heat to all zones.
d. Separate relay is required for each circulator.
4. Zoning with zone valves:
a. Install balancing valves to adjust flow to distrib-
ute heat to all zones.
b. Separate transformer is required to power zone
valves. Refer to “Weil-McLain Zone Valve Wir-
ing Guide” for details.
Connect water piping
(continued)
Figure 12 Multiple zoning with ZONE VALVES
Zone 2
Zone 1
1
4
5 5
1
1
1
Figure 11 Multiple zoning with CIRCULATORS
Legend
1
Isolation valve
2
Flow control valve
3
Circulator
4
Zone valve
5
Drain valve
Part number 550-141-826/1211 20
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WGO
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 —
Boiler Manual