Install Steam Boiler Controls - Weil-McLain 88 Manual

Boiler manual: • Installation

Install steam boiler controls

Install controls:
1. Install controls where shown in
Failure to properly install, pipe and wire boiler controls
can result in severe damage to boiler, building and per-
sonnel; and is not covered by boiler warranty.
a. Install steam pressure operating and high limit controls and
pressure gauge. See Figure 38, Figure 39 and Figure 40, page 28.
Pressure limit control settings:
• Low
– set according to design requirements.
• High
– set at least 2 psi higher than low limit, 15 psi maxi-
mum.
b. Relief valve must be installed with spindle in vertical position.
Use fittings provided with boiler. Do not make any other con-
nection in that piping.
Pipe relief valve discharge through vertical piping to
atmosphere. Use rigid material suitable for 375°F,
threaded one end only. Install drain pan elbow to drain
condensate. Pipe near floor close to floor drain to elimi-
nate potential of severe burns. Do not pipe to any area
where freezing could occur. Do not plug, valve or place
any obstruction in discharge line.
c. Install water level controls and gauge glass per
Figure 39 and Figure 42, page 28.
• Fittings for controls to be furnished by others.
• If water level control is not shown in
locate casting mark on control and install per manufac-
turer's instructions.
Do not use water level controls with quick hook-up fit-
tings. Nuisance shutdowns will occur.
Figure 38
Steam control tappings (see
Location Size Function
A 2" Steam relief valve and/or
Skim tapping
B 2" Steam relief valve
L 1" Secondary probe low water cut-off
C1 & C2 1" Low water cut-offs (see Figure 42, page 28)
C1 —
D1 & D2 1" Alternate low water cut-offs (see Figure 42, page 28)
E1 & E2 ½" Gauge glass
F1 & F2 Try cock tappings
C\,"
G ¾" Pressure limit control,
Pressure operating control and pressure gauge,
Firing rate pressure control (when used)
H ¾" Boiler drain (see Figure 17, page page 15, for system
blow-off (drain) valve locations and sizes
K 1" —
Part No. 550-100-068/1009
• Start-Up • Maintenance
Figure 38 and Figure 39.
Figure 38,
Figure 41, page 28,
Figure 39)
• Parts
Figure 39
Steam control locations
27