Weil-McLain Boiler installation manual Easy-Fit Piping continued, Use isolation heat exchanger for

GAS-FIRED WATER BOILER — Installation Manual — Multiple-boiler Systems

Easy-Fit®Piping (continued)

Figure 11 Typical piping for multiple Ultra boilers, using Weil-McLain Easy-Fit®Manifolds and heat exchanger

Use isolation heat exchanger for:

1. Large volume systems with high mineral content in water.

2. Systems exposed to untreated quan- tities of makeup water.

3. Old systems severely contaminated with scale and rust buildup inside piping and heat distribution units.

4. Process applications.

5. Commercial service water applica- tions.

6. High water pressure applications, requiring pressure relief setting in heating system more than 30 PSIG (tall buildings). See notes below.

1Flow/check valve (each boiler)

2Isolation valves (when used)

3Cap

4Easy-Fit®Manifold (supply), sized per Fig. 6 or Fig. 7, page 8

5Easy-Fit®Manifold (return), sized per Fig. 6 or Fig. 7, page 8

6a Heating system circulator (exchanger tubeside)

6b Heat exchanger shellside circulator

7Expansion tanks (diaphragm type)

8 System air eliminator

9System automatic air vent

13Cold water supply connections

17Boiler circulator (each boiler)

18Heating system supply

19Heating system return

20Boiler relief valve and discharge piping, installed per Ultra Boiler Manual

Notes:

1.Contact heat exchanger manufacturer for heat exchanger shellside and tubeside pip- ing and circulator requirements. Tubeside

flow and temperatures must meet heating system requirements.

2.Contact heat exchanger manufacturer for sizing heat exchanger.

3.Heat exchanger shellside circuit requires its own expansion tank as shown.

4.Heating system circuit requires its own ex- pansion tank, as shown, plus its own re- lief valve set to protect heating system and heat exchanger piping and components.

5.When individual isolation valves are used, individual boiler and level controls may be required.

12 Part number 550-101-232/0703