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Hersteller: Roberts Gorden Dateigröße: 7.2 mb Dateiname: Unterrichtssprache:

The T and Fork layouts have a tee or cross (called the "last tee" or "last cross") where the combustion gases in the system enter the tee or cross with directly opposing flow directions, which creates an added source of pressure drop in the system. This additional source of pressure drop requires some difference in how the allowed manifold length is calculated. In this case, we have to differentiate manifold tube that is located between the radiant pipe and the last tee (or cross) from manifold tube that is located between the last tee (or cross) and the pump. First determine the length of manifold tube between the radiant tube end and the last tee (or cross). Do not count any tube length twice. Now refer to Page 30, Table 10 and find the maximum manifold tube length for each burner. Add together the maximum manifold tube length on the table for each burner in the system, this is the maximum manifold tube length for the entire system. To determine the maximum manifold tube allowed between the last tee (or cross) and the pump: Subtract the manifold tube length between the radiant tube and the last tee (or cross) from the maximum manifold length for the entire system, then divide that number by 1.5. Example: Consider a T layout with two CTHN-100 burners. See Page 33, Figure 21. Assume that 15' (4.5 m) of manifold was used from each radiant tube end to the last tee. Page 30, Table 10 indicates that each CTHN-100 burner can have a maximum of 45' (13.5 m) of manifold tube. Therefore the maximum manifold tube length amount allowed between the last tee and the pump in this case is ([45' + 45']-[15' x 2])/1.5 = 40' or in metric, ([13.5 m + 13.5 m]-[4.5 m x 2])/1.5 = 12 m. FIGURE 21: T Layout B%$)% M %$ 6 *% One pair of burners. CTHN-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL FIGURE 22: Fork Layout B%$)% M" %$ )% % 7$ % " *% 6% 6 .0 Multiple rows of burners: Manifold tube between the last tee or cross and the pump is perpendicular to the manifold tube joining the rows. Pump is not required to be placed in the center of the system (as shown). SECTION 9: MULTIBURNER HEATER INSTALLATION 9.6.3 Herringbone Layout and Manifold Tube Length Rules The herringbone layout is essentially several T layouts stacked together. Therefore, the same principle for manifold tube calculation as used for T layouts is used for herringbone layouts, with one exception. In a herringbone layout, the manifold tube length between tees (or crosses) as well as between the last tee (or cross) and the pump is calculated by dividing by 1.5 as shown in the T example on Page 33, Section 9.6.2. The only manifold tube length in a herringbone layout that is not divided by 1.5 is any manifold tube length located between the end of the radiant tube and a tee or cross. Example: Consider a herringbone layout similar to the layout on the left in Figure 23, having ten CTHN100 burners. Assume that each heater has 40' (12m) of radiant tube and 10'(3m) of manifold tube before FIGURE 23: Herringbone Layout the connecting tee or cross. According to Table 10 each burner must have at least 40' (12m) of radiant tube, also each burner must have between 6' (2m) and 45' (13.5m) of manifold tube. Each burner has already met the minimum manifold pipe requirement due to the 10' (3m) of manifold tube before the connecting tees and crosses. The maximum manifold tube length for the entire system is 10 burners X 45' (13.5m) = 450' (135m). Subtract the 100' (30m) that has already been used before the connecting tees/crosses and 350' (105m) remains. Since the remaining manifold is located either between or after connecting tees or crosses, the manifold length must be divided by 1.5. 350' (105m)/ 1.5 = 233' (70m). Therfore, up to 233' (70m) can be used between the branches and also between the last cross and the pump. )% M %$)% % 6 B%$ .806 B%$ 6 *% Multiple opposing rows of burners: pump placed at the end of the manifold tube or somewhere between the burners. CTHN-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL 36 Step 9.7 Burner Tube Installation Step 9.8 Tube Clamp Package Installation DE-I/E .F"$I2"$0 "-&. 6% H% /9-./8"$0 E.$0 # $ % '! *% 6% & J $% $% + $ $% $ % Description Part Number Burner Tube 03051XXX S-Hook 91907302 Tube/Reflector Hanger 03090100 6% $ * 1 + % .6H% /9 /82$0 Description Part Number Tube Clamp Package 01318901 Tube Clamp 01396801 Bolt 97113940 Flat Washer 95211600 Nut 92113900 SECTION 9: MULTIBURNER HEATER INSTALLATION 37 Step 9.9 Coupling and Tube Assembly Step 9.9.1 Coupling and Tube Assembly (Continued) 6% 6% J "% $" "! K/KL""! / " 6 8-.:"$0 ,-./"$0 ' *9%"! % + @ % 6% ' *9%"! AClose coupling with tab. B Start slide bar/coupling lock onto coupling. CInsert tubes into coupling. D Tighten coupling to join tubes. Description Part Number Coupling 01329600 Slide Bar/Coupling Lock 01329700 Tube 91409XXX # 0 1 / # 0 ' I-.2"$0 7 % @ % " • Repeat Step 9.9 on Page 37, A - D until all tubes...

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