Weil-McLain CGA GAS BOILER CGA-5 User Manual

Loading ...

Part Number 550-142-300/0520

CGa Series 3 Gas-Fired Water Boiler — Boiler Manual

Diaphragm-type or bladder-

type expansion tank

(Figure 9)

1. Ensure expansion tank size will handle boiler and

system water volume and temperature. Tank must

be located in boiler return piping as close to boiler

as possible, before inlet side of circulator. See tank

manufacturer’s instructions for details.

2. Install an

automatic air vent as shown.

Closed-type expansion tank

(Figure 10)

1. Ensure expansion tank size will handle boiler and

system water volume and temperature. See tank

manufacturer’s instructions for details.

2. Connect tank to ½” NPT tapping located behind

supply outlet, using ½” NPT piping. Pitch any

horizontal piping up towards tank 1 inch per 5 feet

of piping.

Undersized expansion tanks cause system water to be lost from relief valve and makeup water

to be added through ﬁll valve. Eventual section failure can result.

Water piping — single-zone system

Figure 9 Diaphragm- or bladder-type expan-

sion tank — Single-zone system using

diaphragm-type or bladder-type expan-

sion tank. See Table 3 for piping sizes.

Figure 10 Closed-type expansion tank — Single-

zone system using closed-type expan-

sion tank. See Table 3 for piping sizes.

Use Figure 9 or Figure 10 only for single-zone systems designed for return water at least

130°F.

For systems with low return water temperature possible, such as converted gravity

systems and radiant heating systems, refer to the special piping suggestions of pages 20-25.

Failure to prevent low return water temperature to the boiler could cause corrosion of the boiler

sections or burners, resulting in severe personal injury, death or substantial property damage.

Loading ...

Weil-McLain CGA GAS BOILER CGA-5 Series 3 Residential Boilers