Connect Water Piping
General piping information:
•If installation is to comply with ASME or Canadian requirements, an additional high temperature limit is needed. Install control in supply piping between boiler and isolation valve. Set control to a minimum of 20°F above set point of combination control. Maximum allowable set point is 220°F. Wire control as shown on wiring diagram.
•Use a low water cutoff device when:
—Boiler is installed above radiation level.
—Required by certain state or local codes or insurance companies.
Use low water cutoff designed for water installations.
•Use backflow check valve in cold water supply as required by local codes.
Install piping:
•See FIGURE 8 or 9 on page 15 and Water Piping Size Table at right for
For
•Install relief valve vertically in “R1” tapping on front of boiler. See FIGURE 8 or 9 and also refer to tag attached to relief valve for manufacturer’s instructions.
Pipe relief valve discharge line near floor close to floor 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.
DIAPHRAGM expansion tank (FIGURE 8):
•Make sure expansion tank size will handle boiler and system water volume and temperature. Tank must be located near boiler before inlet to circulator. See tank manufacturer’s instructions for details.
Undersized expansion tanks cause system water to be lost
from relief valve and makeup water added through fill valve. Eventual section failure can result.
•Install automatic air vent in “N” tapping as shown in FIGURE 8.
CLOSED expansion tank (FIGURE 9):
•Ensure expansion tank size will handle boiler and system water volume and temperature.
Undersized expansion tanks cause system water to be lost from relief
valve and makeup water added through fill valve. Eventual section failure can result.
•Connect tank from “N” tapping shown in FIGURE 9 to expansion tank. Use ½" N.P.T. piping. Pitch any horizontal piping up towards tank 1 inch per 5 feet of piping.
WATER PIPING SIZE TABLE *
BOILER |
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MODEL | TO | FROM |
NUMBER | SYSTEM | SYSTEM |
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1" | 1" | |
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1¼" | 1¼" | |
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1¼" | 1¼" | |
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1½" | 1½" | |
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1½" | 1½" | |
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1½" | 1½" | |
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2" | 2" | |
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2" | 2" | |
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*All piping sizes based on 20°F temperature rise through boiler.
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