Install Boiler Controls - Weil-McLain LGB-4 User Manual

Controls
Relief valve stem
vertical only
Water boiler controls
Steam boiler
controls
Table 4
Recommended locations for
steam boiler low water
cutoffs, water feeders and
pump controllers
(See Figure 23, page 23)
Notes
22
LGB
Gas-Fired Boiler — Boiler Manual
6

Install boiler controls

Failure to properly install, pipe and wire boiler controls may result in
severe damage to the boiler, building and personnel.
Install relief valve with spindle in vertical position. Relief valve discharge
piping must be piped near floor close to floor drain to eliminate potential
of severe burns. Do not pipe to any area where freezing could occur.
1. Install controls in the tappings given in
2. Low water cutoff for a water boiler:
a. Must be installed on any water boiler if the boiler is located above radiation level.
b. May be required on water boilers by certain state, local or territorial codes or insurance
companies.
3. If a low water cutoff is used on a water boiler, use a control designed especially for water
installation. See control tapping locations in
location, or install in piping above boiler.
4. Dual limit control settings:
a. Low — set according to design requirements.
o
b. High — 20
5. Install optional controls per control manufacturer's instructions.
1. Install pressure operating and limit controls, water level controls, gauge glass and pressure
gauge as in
Figures 22 and 23
given in
Figures 11a or 11b
2. Install water level control(s) as shown in
level control to be used is not shown in the table, install according to manufacturer's
instructions.
Location 1
Primary water level control
(Note 1)
61,63
150S-MD, 93 (Notes 2 & 3)
51-2 and 51-S-2 (Note 2)
61 and 63
150S-MD, 93
(Notes 2 & 3)
51-2 and 51-S-2
(Note 2)
Other manufacturers' controls providing similar function may be used, if properly located and selected to handle boiler
1
evaporative capacity. Weil-McLain does not recommend using McDonnell & Miller Model 157 or 193.
Cannot be used as backup water level controls.
2
When pump control is used with feed water tank, install pump control on boiler and makeup water feeder on tank. Use
3
separate low water cutoff on boiler when backup is needed. Do not install combination low water cutoff and feeder as
backup control on boiler. Feeder will operate before pump control operates.
Figures 11a or 11b
o
higher than low limit, 240 F maximum.
. Install relief valve(s), blowdown valve and other items as
, pages 12 and 13.
Figures 22 and 23
A
Casting line height
(above bottom of
gauge glass)
1"
/
2 3 "
8
/
3 5 "
8
1 / "
1
2
2 / "
3
8
3 / "
5
8
, pages 12 and 13.
Figures 11a and 11b , pages 12 and 13, for
and , below. If water
Table 4
Location 2
First backup water level Casting line height
control (Note 1) (above bottom of
gauge glass)
--
--
--
61 and 63
61 and 63
61 and 63
Part Number 550-141-186/0100
B
--
--
--
/ "
1
2
/ "
1
2
/ "
1
2