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Part Number 550-142-303/1120
20
EG
/
PEG sEriEs 6
•
EGH sEriEs 5 Gas-firEd boilErs — boilEr manual
Failure to properly install, pipe and wire boiler
controls may result in severe damage to the
boiler, building and personnel.
Water boiler - EG only
1. Install controls as shown on Control Tapping Table and
Figure 5, page 10.
2. Additional low water cut off for water boilers:
a. Install if boiler is located above radiation level.
b. May be required on water boilers by certain state, local or
territorial codes or insurance companies. If a low water
cut-off is used on a water boiler, use a control designed
especially for water installations.
An electrode probe type
may be located in a tee in
the supply line above boiler, also
see Table 4, page 10.
3. If system is to be ASME inspected and approved, an ad-
ditional high temperature limit is needed. Purchase and
install in supply line above boiler.
Steam boiler - EG, PEG & EGH
Water line dimension are measured from bot-
tom of boiler section leg where it rests on the
boiler room floor or boiler foundation.
1. For steam boilers furnished with probe-type low water
cut-offs, install as shown in Figure 21.
2. For steam boilers furnished with float type low water
cut-off, install controls as illustrated in Figure 22.
Install blow down line in bottom of cutoff. See Figure 22
and control manufacturer’s instructions for details.
Pipe blow down line near floor close to floor
drain to eliminate potential of severe burns. Do
not plug, valve or place any obstruction in blow
down line.
a. Other float-type water-level controls for EGH steam boilers
are shown in Figure 23. (Use 1 inch I.P.S. connections).
b. Water feeders are not recommended for primary control.
A low-water cut-off with pump controller is recommended
with a condensate receiver and feed pump.
3. Install remaining controls as shown in Table 4 and Fig-
ure 5, page 10.
Install boiler controls
Figure 23 EGH only - Piping for optional float-type water level
controllers for steam boilers
LWCO model numbers are manufacturer’s part
numbers that can be found in the Weil-McLain
Trade Price Schedule.
LWCO Dim A.
No. 247-2
7
³/16”
No. 61 2 ⅝”
No. 63 2 ⅝”
No. 51-2 1 ½”
No. 150, 157 2 ¼”
No. 93 2 ⅝”
Primary oat LWCO or secondary manual reset
LWCO with primary probe LWCO
Figure 21 Probe-type low water cut-off - (Left side view)
Figure 22 Float-type low water cut-off - (Left side view)
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