Install Water Boiler Controls - Weil-McLain 88 Manual

Weil-McLain 88 Water and steam boilers — Series 2 —

Install water boiler controls

Install controls:
1. Install furnished controls per
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.
2. Relief valve must be installed with spindle in vertical position. Use
fittings provided with boiler. Do not make any other connection
in that piping.
Relief valve discharge line must be piped using rigid
material suitable for 375°F, threaded one end, near floor
close to drain to eliminate 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.
3. When installing low water cut-off
a. Must be installed if boiler is located above radiation level.
b. May be required on water boilers by certain state, local or ter-
ritorial codes or insurance companies.
c. Install low water cutoff designed for water installations where
shown in Figure 36 and Figure 37.
4. If installation is to comply with ASME installation requirements, an
additional high temperature limit is needed. Purchase and install in
supply line between boiler and isolation valve or in tapping "A."
5. Dual limit control settings:
a Low
– set according to design requirements.
b High
– at least 20° higher than low limit, 240°F maximum.
6. Install optional controls per control manufacturer's instructions.
Figure 36
Water control tappings (see
Location Size Function
A 2" High limit
Manual reset limit
B 2" Water relief valve
L 1" Not used — plug
C1 & C2 1" Alternate low water cut-offs
C1 Combination high and low
limit control
D1 & D2 1" Firing rate temperature
control (when used)
Low water cut-offs
E1 & E2 ½" —
F1 & F2 —
C\,"
G ¾" Combination pressure–temperature gauge
H ¾" Boiler drain
K 1" Piping to compression tank or automatic air vent
26
Figure 36 and Figure 37.
Figure 37)
for Gas, Light Oil, & Gas/Light Oil-Fired Burners
Figure 37
Water control locations
Part No. 550-100-068/1009