Weil-McLain 550-141-826/1201 - Manual (Page 21)

SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping
(continued)
Figure 13 Piping with CIRCULATORS
Figure 14 Piping with ZONE VALVES
Piping for systems requiring
temperatures below 140°F
In most systems, this type of piping is not required. If
system water temperature requirements are less than
140°F, such as radiant panels or converted gravity sys-
tems, use piping as shown in Figure 13 or Figure 14. If
system piping is plastic without an oxygen barrier, a
heat exchanger must be used.
Legend
1
Isolation valve
2
Flow control valve
3
Circulator
4
System temperature
gauge
5
Zone valve
6
Drain valve
7
System temperature
valves
Adjust valves so that:
- the temperature at
gauge 8 is at least 140°F
- the temperature at
gauge 9 is at least 160°F
8
Blend temperature
gauge
9
Boiler temperature
gauge
Part number 550-141-826/1211 21
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 —
Boiler Manual