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Connect water piping(continued)
1. If system water temperature requirements are less
than 140 °F, such as radiant panels or converted
gravity systems, use piping as shown in Figure 10
or 11.
2. If system piping is plastic without an oxygen barrier,
a heat exchanger must be used.
3. Follow instructions on page 14 and 15 to install
near-boiler piping.
4. Zoning with circulators (Figure 10)
a. Size each circulator to individual circuit requirements.
b. Remove circulator (when furnished as standard equip-
ment). See Replacement Parts page36 for circulator
replacemnt part numbers.
c. Install balancing valves to adjust ow to distribute heat
to all zones.
d. Separate relay is required for each circulator.
5. Zoning with zone valves (Figure 11)
a. Install balancing valves to adjust 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.
6. To set the valves, 7a and 7b:
a. Set the valves while the system is cool, setting for the
coldest expected water temperature (usually 60 °F
since the system will oen drop to room temperature
between cycles).
b. Start with valve
7a fully closed and 7b fully open.
c. Gradually open valve
7a while closing 7b until the
temperature at gauge
8 reads 130 °F when gauge 4a
reads 60 °F.
d. Note that valve 7a regulates the amount of hot water
from the boiler supply, which mixes with return water.
Valve
7b regulates the amount of system water owing
through the boiler secondary loop.
Zone 1
Zone 2
11
11
2
2
3
4b4a
6
6
7b
7a
8
Max.
12”
UO016
3
Part number 550-143-013/0621
17
Series 3
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