LGB
Gas-Fired Boiler — Boiler Manual
Part Number 550-141-186/0100
12
Hydrostatic pressure
test
Pressure test before connecting gas piping and electrical supply.
1. Refer to
Figures 11a and 11b
for control tapping locations. Install:
a. Boiler drain (not supplied).
b. Water pressure gauge — for test only. Be sure gauge can handle test pressures. See
Step 3
.
2. Plug remaining tappings.
Figure 11a
Left end section tappings
2c
Boiler assembly
pressure test
3. Fill boiler. Vent all air. For more than 10 minutes, pressure-test:
a. Steam boilers between 45 - 55 psig.
b. Water boilers 1 ½ times maximum working pressure stated on castings and boiler
nameplate.
No controls
installed
DO NOT
pressure test with any controls installed. Damage to control can
occur.
Do not leave
boiler
unattended
Do not leave boiler unattended. Cold water fill could expand and cause
excess pressure, resulting in severe personal injury, death or substantial
property damage.
5" Return
5" Return
6" Supply
6" Supply
G1
G1
E1
E1
D1
D1
M1
M1
M2
M2
K1
K1
H1
H1
H2
H2
D2
D2
E2
E2
C1
C1
J1
J1
F1
F1
186-11a
Tapping
Size
Inches
Steam Boilers
Water Boilers
(note 4)
C1
1
1
/
4
Boiler drain
Boiler drain
D1 & D2
1
/
2
Gauge glass
(note 3)
--
E1 & E2
1
Low water cutoff
(note 3)
Optional low water
cutoff
E1
1
Pressure
operating & limit
controls and
pressure gauge
Limit control
(note 2)
F1
1
--
To expansion tank or
automatic air vent
(note 2)
G1
3
/
4
--
Operating control
(note 2)
H1 & H2
(note 1)
3
/
8
Tri-cock
--
J1
2
Steam relief valve
& skim tapping
Water relief valve &
skim tapping
K1
1
/
2
--
Combination pressure
& temperature gauge
(note 2)
M1 & M2
1
Optional low water
cutoff
(note 3)
Optional low water
cutoff
M1
1
Firing rate control
(when used)
Firing rate control
(when used)
or Probe
low water cutoff
Notes:
1. Available on special request only.
2. Must be on same side as supply to system.
3. Must be on same side as steam equalizer piping.
4. Additional controls for water boilers may be placed in supply piping.
