Specifications include, but are not limited to: 2.1. MODEL NAMES The number of coils in a particular Heat Exchanger is denoted by the two digits following the “B+” in the Heat Exchanger Model Number. That is: B+03 = 3 coils, B=07 = 7 coils, B+11 = 11 coils, and B+15 = 15 coils. The Style designation for a Heat Exchanger denotes materials of construction for the various components of the assembly. If this information is required for a specific Heat Exchanger, contact the nearest AERCO Sales Representative. 2.2. HEAT EXCHANGER CONFIGURATIONS There are three basic heat exchanger configurations; those with a pneumatically controlled valve (CXT-P), those with Electronic Control System (ECS) with an electronically controlled valve (CXT-E), and a “bare” heat exchanger without controls or valve. See separate ECS Controls manual, AC-105, for information about the Electronic controls System and electronically operated CXT-E valve. See Section 3 for available accessories. 2.3. ACCESSORIES Accessories included in the AERCO B+ Heater Package Assembly (See Figures 1a, 1b, 1c, 21, 22, and 23) include: • Steam Flow Control Valve – either Air-Operated or Self-Contained as ordered and furnished, sized as required for the service. • Temperature Controller – installed in the Control Box when an Air Operated Control Valve is furnished (See Fig. 20, Item 134). • Over-Temperature Limit System, including the following: • Temperature Switch – installed in the Control Box (Figure 20, Item 126). • Solenoid Valves: o Water – installed in the Heater Top Head. o Air – installed in the Control Box when an Air Operated Control Valve is furnished (Fig. 20, Item 135). o Steam – installed on the Self-Contained Control Valve when such valve is furnished. o Indicator Lights: “Power On” and “Tripped” – installed in the Control Box (Figure 20, Items 129 and 130). • Steam Compound Pressure Gage – mounted below the Control Box (Figure 20, Item 133). • Shell Hot Water Outlet Temperature Gage – mounted below the Control Box (Figure 20, Item 132). • Pressure & Temperature Relief Valves – size and number furnished as required in accordance with the design BTU output of the heater – first two located in the heater Top Head as shown in Figure 1a, 1b, 1c, and 1d. The third, if furnished, to be installed in the hot water outlet piping by the user as shown in Figure 2. • Union Orifice – located in the Condensate Outlet (Figure 12, Item 55) – required in place of a steam trap to ensure complete condensation of the steam within the heater. • Check Valve – located in the Condensate Outlet (Figure 12, Item 53).