Table of Contents
Advertisement
water boiler
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.
. If system piping is plastic without an oxygen barrier,
a heat exchanger must be used.
. Follow instructions on page 1 and 14 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 flow to distribute heat
to all zones.
d. Separate relay is required for each circulator.
Figure 10 Multiple zoning with circulators –
1
Isolation valve
2
Flow control valve
3
Circulator
4
System temperature gauges
5
Zone valve
16
— Boiler Manual
(continued)
. Zoning with zone valves (Figure 11)
a. Install balancing valves to adjust flow 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.
7a
7b
6. To set the valves,
and
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).
7a
b. Start with valve
fully closed and
7a
c. Gradually open valve
8
temperature at gauge
reads 10 °F when gauge
reads 60 °F.
7a
d. Note that valve
regulates the amount of hot water
from the boiler supply, which mixes with return water.
7b
Valve
regulates the amount of system water flowing
through the boiler secondary loop.
Figure 11 Multiple zoning with zone valves –
6
Drain valve
7
System temperature valves. Adjust valves
8
Blend temperature gauge
9
Boiler temperature gauge (not shown)
Part number 550-141-986/1005
:
7b
fully open.
7b
while closing
until the
4a
Advertisement
Table of Contents
