Install Boiler Controls - Weil-McLain EG Manual

EG PEG EGH
• •

Install boiler controls

Failure to properly install, pipe and wire
boiler controls may result in severe dam-
age to the boiler, building and personnel.
Water boiler
1. Install controls as shown on Control Tapping Table
and Figure 5, page 10. Limit control and supply pip-
ing must be on the same end of EGH boiler.
2. Low water cut off for water boilers:
a) Must be installed if boiler is located above radiation
level.
b) Must be installed on all EGH 105-125 water boilers
to meet ASME specifications (low water cut-off not
supplied by Weil-McLain).
c) 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 additional high temperature limit is needed.
Purchase and install in supply line above boiler.
Steam boiler
Water line dimension are measured from
bottom of boiler section leg where it rests
on the boiler room floor or boiler founda-
tion.
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 blowdown line in bottom of cutoff. See Fig-
ure 22 and control manufacturer's instructions for
details.
Pipe blowdown line near floor close to
floor drain to eliminate potential of severe
burns. Do not plug, valve or place any
obstruction in blowdown line.
a) Other float-type water-level controls for EGH steam
boilers are shown in Figure 23. (Use 1 inch I.P.S. con-
nections).
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
Figure 5, page 10.
20
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Gas firEd boilErs
— 4 —
sEriEs boilEr manual
Figure 21
Probe-type low water cut-off
Figure 22
Float-type low water cut-off
Figure 23
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.
L.W.C.O. Dim A.
No. 247-2
1 ³⁄₁₆"
No. 61
2 ⁵⁄₈"
No. 63
2 ⁵⁄₈"
No. 51-2 1 ¹⁄₂"
No. 150, 157
2 ¹⁄₄"
No. 93
2 ⁵⁄₈"
Part Number 550-110-639/0512