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The valve sizing does change based on the designed boiler AT, since the flow rate and the pressure drop change for each. See Appendix B for proper valve selection. f. Glycol Antifreeze Solutions - Many systems today use ethylene or propylene glycol antifreeze solutions as a measure for freeze protection, as well as a pump lubricator and corrosion inhibitor. The properties of the glycol mixture have an impact on valve and pump sizing. All glycol solutions have a lower specific heat than water. This means that the glycol solution cannot transfer heat as well as pure water, resulting in the need for higher flow rates. In addition, the viscosity of the glycol solution is usually higher than water, requiring a higher pump head for the same given flow. Consult factory for specific applications, pump selection and flow rate. g. Nipple and Sensor - The 3 x 12 special nipple must be installed in the lower right return connection when looking at the rear section, when using the RTC. Insert the return sensor using pipe dope. 2. STEAM HEATING, consult I=B=R Installation and Piping Guide No. 200. For piping details, see Figure 34. Figure 35 shows a typical pumped return/ boiler feed unit arrangement. Figure 36 illustrates the required mounting elevations for McDonnell and Miller 150 and 63 float low water cut-offs. 34 Recommendation 1 — Use when: • system return water is not less than 135° F for prolonged periods of time • system flow does not impact flow through the boiler © SUPPLY DRAIN VALVE (SEE NOTE 4) 24-03 THRU 24-11 (W/20°F DROP) 24-03 THRU 24-12 (W/40°F DROP) © SUPPLY DRAIN VALVE (SEE NOTE 4) Pipe Sizing and Notes SUPPLY PIPING SIZE (IN) (1) RETURN PIPING SIZE (IN) RETURN (2) RETURN HEADER (2A) RETURN BRANCH (QTY.) SIZE (2B) 20°F 40°F 20°F 40°F 20°F 20°F MODEL DROP DROP DROP DROP DROP DROP 24-03 2 1-1/2 2 1-1/2 — — 24-04 2 1-1/2 2 1-1/2 — — 24-05 2 1-1/2 2 1-1/2 — — 24-06 2-1/2 1-1/2 2-1/2 1-1/2 — — 24-07 2-1/2 2 2-1/2 2 — — 24-08 2-1/2 2 2-1/2 2 — — 24-09 3 2 3 2 — — 24-10 3 2-1/2 3 2-1/2 — — 24-11 3 2-1/2 3 2-1/2 — — 24-12 4 2-1/2 4 2-1/2 3 (2)3 NOTES: 1.All piping is schedule 40. 2.Pipe sizes listed are based on a 20°F or 40°F differential (temperature drop). Select one to match application. 3.When specified return piping size is less than 3”, install 3” X 12” nipple and appropriate size bell reducer directly into boiler return tapping as shown. 4.Drain valve — ball valve preferable, gate valve acceptable alternative (supplied by others). - Minimum valve size per ASME code is 3/4” NPT. Figure 31: Series 24 Minimum Piping Recommendation 1 - Water Boiler 35 Recommendation 2 — Use when: • system return water is not less than 135° F for prolonged periods of time • system flow does impact flow through the boiler(ie. zoning, mixing) 24-03 THRU 24-11 (W/20°F DROP) 24-03 THRU 24-12 (W/40°F DROP) 24-12 (W/20°F DROP) Pipe Sizing and Notes RETURN PIPING SIZE (IN) SUPPLY PIPING RETURN RETURN SIZE (IN) HEADER BRANCH (1) RETURN (2) (2A) (QTY.) SIZE (2B) 20°F 40°F 20°F 40°F 20°F 20°F MODEL DROP DROP DROP DROP DROP DROP 24-03 2 1-1/2 2 1-1/2 — — NOTES: 24-04 2 1-1/2 2 1-1/2 — — 1.All piping is schedule 40. 24-05 2 1-1/2 2 1-1/2 — — 2.Pipe sizes listed are based on a 20°F or 40°F differential (temperature drop). 24-06 2-1/2 1-1/2 2-1/2 1-1/2 — — Select one to match application. 24-07 2-1/2 2 2-1/2 2 — — 3.When specified return piping size is less than 3”, install 3” X 12” nipple and appropriate 24-08 2-1/2 2 2-1/2 2 — — size bell reducer directly into boiler return tapping as shown. 24-09 3 2 3 2 — — 4.Drain valve — ball valve preferable, gate valve acceptable alternative 24-10 3 2-1/2 3 2-1/2 — — (supplied by others). 24-11 3 2-1/2 3 2-1/2 — — - Minimum valve size per ASME code is 3/4” NPT 24-12 4 2-1/2 4 2-1/2 3 (2)3 5.Proper boiler circulator sizing is listed in Appendix B. Figure 32: Series 24 Minimum Piping Recommendation 2 - Water Boiler 36 Recommendation 3 — Use when: • system return water is less than 135° F for prolonged periods of time • system flow does impact flow through the boiler(ie. zoning, mixing) • requires addition of RTC Return Temperature Control and accessories SYSTEM 24-03 THRU 24-11 (W/20°F DROP) 24-03 THRU 24-12 (W/40°F DROP) Pipe Sizing and Notes 24-12 (W/20'F DROP) NOTES: 1.All piping is schedule 40. 2.Pipe sizes listed are based on a 20°F or 40°F differential (temperature drop). Select one to match application. 3.When specified return piping size is less than 3”, install 3” X 12” nipple and appropriate size bell reducer directly into boiler return tapping as shown. 4. Drain valve — ball valve preferable, gate valve acceptable alternative (supplied by others). - Minimum valve size per ASME code is 3/4” NPT 5.Maximum linear feet of pipe from 3-way bypass port to sensor location = 11 feet. Bypass line shall be the same diameter as return A 6.Minimum linear feet of pipe from point o...

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