Weil-McLain UltraOil Series 3 Installation, Start-Up, And Operating Instructions Manual page 17

®
Series 3
Connect water piping
Piping MULTIPLE ZONES — System temperature below 140 °F
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 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.
d. Separate relay is required for each circulator.
Figure 10 Multiple zoning with circulators –
1
2
01
1 Isolation valve
2 Flow control valve
3 Circulator
4 System temperature gauges
5 Zone valve
Part number 550-142-182/1014
— Boiler Manual
WATER BOILER
Temperatures below 140 °F
Zone 2
Zone 1
4a 4b
Max.
12"
1 1
7b
6
7a
8
(continued)
5. Zoning with zone valves (Figure 11)
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.
6. To set the valves,
a. Set the valves while the system is cool, setting for the
coldest expected water temperature (usually 60 °F
since the system will often drop to room temperature
between cycles).
b. Start with valve
c. Gradually open valve
temperature at gauge
reads 60 °F.
d. Note that valve
from the boiler supply, which mixes with return water.
Valve
through the boiler secondary loop.
Figure 11 Multiple zoning with zone valves –
1
2
3
6
3
6 Drain valve
7 System temperature valves. Adjust valves
8 Blend temperature gauge
9 Boiler temperature gauge (not shown)
7a and 7b :
7a 7b
fully closed and
7a while closing
8
reads 130 °F when gauge
7a
regulates the amount of hot water
7b regulates the amount of system water fl owing
Temperatures below 140 °F
fully open.
7b until the
4a
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