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Reflectors can be used over the manifold tube but are not required. The system design parameters are such that the manifold sections are not subjected to condensate when the system is fully heated up. It is required that heat-treated aluminized or coated tubing is used for the manifold to increase system life and to handle initial condensation during start-up. Damper couplings may be necessary to balance system vacuum. Design requirements for a CTHN multiburner system are summarized on Page 30, Table 10. CTHN multiburner heaters are typically shipped as burner packages and tube and accessory packages. The tube and accessory packages contain enough tube, reflector and hanging parts for the radiant section of one CTHN heater. Elbows, tees, manifold tube, pumps, controls, damper couplings and any other parts used beyond the burner, radiant tube and reflector must be purchased separately. See Figure 18 for a general overview of a simple CTHN multiburner system. Depending on system requirements, CTHN multiburner systems may be controlled by either a ROBERTS GORDON® System Control (shown) or by a relay system. FIGURE 18: Typical CTHN Multiburner System Installation --B % ' "'# $.0B%$@5% J% 7 '" N 6 $ N /6 $ 6 6% )6% J "*% 6% %. H% 0 CTHN-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL Table 10: Multiburner Design Requirements Burner Model: CTHN-40 CTHN-60 CTHN-80 CTHN-100 CTHN-125 CTHN-150 CTHN-175 CTHN-200 Radiant Tube Length 20' (6 m) 30' (9 m) 30' (9 m) 40' (12 m) 50' (15 m) 50' (15 m) 60' (18 m) 60' (18 m) Minimum Manifold Tube Length per Burner 3' (1 m) 3' (1 m) 3' (1 m) 6' (2 m) 6' (2 m) 10' (3 m) 10' (3 m) 10' (3 m) Maximum Manifold Tube Length per Burner 30' (9 m) 35' (10.5 m) 40' (12 m) 45' (13.5 m) 50' (15 m) 55' (16.5 m) 60' (18 m) 60' (18 m) Minimum Distance from Burner to Elbow or U-tube 10' (3 m) 10' (3 m) 10' (3 m) 15' (4.5 m) 15' (4.5 m) 20' (6 m) 20' (6 m) 20' (6 m) Elbows Allowed per Burner* 2 2 2 2 2 2 2 2 * U-tube = 2 elbows 9.3 Burners Per Pump 1. The maximum number of burners per pump is shown in Table 11 . 2. When combining different burner inputs in a system, the number of burners per pump (0' - 2,000' altitude) is given by the sum of their inputs: a. EP-100 up to 500,000 Btu/h max, but not more than 4 burners. Table 11: Number of Burners Allowed Per Pump Pump Model Altitude CTHN-40 CTHN-60 CTHN-80 b. EP-200 up to 750,000 Btu/h max, but not more than 6 burners. c. EP-300 up to 1,600,000 Btu/h max, number of burners is limited to the maximum number of burners listed in Table 11 for the largest input model used. CTHN-100 CTHN-125 CTHN-150 CTHN-175 CTHN-200 EP-100 0' - 2,000' 4 4 4 4 4 3 2 2 2,001' - 3,000' 4 4 4 4 3 3 2 2 3,001' - 4,000' 4 4 4 4 3 2 2 2 4,001' - 5,000' 4 4 4 4 3 2 2 2 5,001' - 6,000' 4 4 4 4 3 2 2 2 6,001' - 7,000' 4 4 4 3 3 2 2 2 7,001' - 8,000' 4 4 4 3 3 2 2 1 8,001' - 9,000' 4 4 4 3 2 2 2 1 EP-200 Series 0' - 2,000' 6 6 6 6 6 5 4 4 2,001' - 3,000' 6 6 6 6 6 5 4 3 3,001' - 4,000' 6 6 6 6 5 4 4 3 4,001' - 5,000' 6 6 6 6 5 4 4 3 5,001' - 6,000' 6 6 6 6 5 4 3 3 6,001' - 7,000' 6 6 6 6 5 4 3 3 7,001' - 8,000' 6 6 6 6 5 4 3 3 8,001' - 9,000' 6 6 6 6 5 4 3 3 EP-300 Series 0' - 2,000' 16 16 14 12 12 10 8 8 2,001' - 3,000' 16 16 14 12 12 9 8 7 3,001' - 4,000' 16 16 14 12 11 9 8 7 4,001' - 5,000' 16 16 14 12 10 9 7 6 5,001' - 6,000' 16 16 14 12 10 8 7 6 6,001' - 7,000' 16 16 14 12 10 8 7 6 7,001' - 8,000' 16 16 14 12 10 8 6 6 8,001' - 9,000' 16 16 14 12 10 8 6 6 SECTION 9: MULTIBURNER HEATER INSTALLATION 9.4 Radiant Tube Length The radiant tube length fixed for each burner is shown on Page 30, Table 10. 9.5 Manifold Tube Any tube beyond the radiant tube length is considered manifold. Manifold tube can be used to lengthen tube runs beyond the radiant tube length; to connect multiple runs of tubing and connect the system to the pump. Minimum and maximum manifold tube lengths are shown on Page 30, Table 10. The table must be used in conjunction with the additional rules for the diameter and length of manifold in a system, as described on Page 31, Section 9.5.1 through Page 35, Section 9.6.3. 9.5.1 Manifold Diameter 1. Manifold diameter for systems containing less than 320,000 Btu/h input can be 4" (10 cm) or 6" (15 cm). 2. Manifold diameter for systems containing 320,000 Btu/h input and greater must be 6" (15 cm). Exception: If total manifold tube length is 70' (21 m) or less, 4" (10 cm) diameter manifold tube can be used for systems up to 800,000 Btu/h. 9.6 Multiburner System Layouts and Manifold Tube Length Rules Most CTHN multiburner layouts can be classified as one of the following five layout types: Flag, Modified In-Series, T, Fork or Herringbone. Please refer to Page 31, Section 9.6.1 through Page 35, Section 9.6.3 for explanation of manifold rules and basic diagrams of each layout type. The diagrams show very simple examples of each layout type. Actual layouts will vary in total number of burners in the system as well as the overall shape of the system. Additional pieces...

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