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See Figure 15 for wiring information. 5) Valves and Unions - Install shut-off valves, drain valves, and unions in locations that will facilitate maintenance of the system. Do not install any valves between the boiler and circulator inlet. IMPORTANT • Some indirect water heaters may not be suitable for use with a steam boiler. Consult the water heater manufacturer’s guidelines before installing it in this type of system. • Boiler water temperatures and flow rates in this type of system may be considerably lower than those upon which the water heater manufacturer’s ratings are based. This may result in substantially longer water heater recovery times. FIGURE 13: INDIRECTWATER HEATER BOILER-SIDE PIPING 15 X Wiring WARNING All wiring and grounding must be done in accordance with the authority having jurisdiction or, in the absence of such requirements, with the National Electrical Code (ANSI/NFPA 70) 1) 120 Volt Wiring - The boiler should be provided with its own 15A branch circuit with fused disconnect. All 120 volt connections are made inside the junction box on the left side of the boiler. Remove the transformer to gain access to this box (also see Figures 16 through 19): • Hot (“black”) - Wire nut to black transformer lead • Neutral (“white”) - Wire nut to white transformer lead • Ground (“green” or bare) - Ground screw inside junction box. 2) Thermostat Wiring - Follow thermostat manufacturer instructions. To insure proper thermostat operation, avoid installation in areas of poor air circulation, hot spots (near any heat source or in direct sunlight), cold spots (outside walls, walls adjacent to unheated areas, locations subject to drafts). Provide Class II circuit between thermostat and boiler. Connect thermostat wire leads to the blue transformer lead and brown relay lead inside the junction box. Set the heat anticipator to 0.2A. Feeder Wiring for Boilers Equipped with Hydrolevel CG400A Low Water Cut-offs CAUTION Do not attempt to connect a McDonnell & Miller model #101A feeder, or other feeder without a delay, to a BSI boiler equipped with a Hydrolevel CG400 low water cutoff. Doing so could destroy the boiler transformer and/or flood the system. 1) Using Hydrolevel VXT-24 TWO-WIRE feeder -Do not alter factory boiler wiring. Connect VXT-24 to CG400A as follows: • Connect the BLACK lead on the feeder to terminal A on the LWCO • Connect the WHITE lead on the feeder to terminal 2 on the LWCO 2) Using Hydrolevel VXT-24 THREE-WIRE feeder -Do not alter factory boiler wiring. Connect VXT-24 to CG400A as follows: • Connect the BLACK lead on the feeder to terminal 1 on the LWCO • Connect the WHITE lead on the feeder to terminal 2 on the LWCO • Connect the RED lead on the feeder to terminal A on the LWCO 3) Using McDonnell & Miller WF2-U-24 feeder -Do not alter factory boiler wiring. Connect WF2-U-24 to CG400A as follows: • Connect terminal W on the feeder to terminal A on the LWCO • Connect terminal N on the feeder to terminal 2 on the LWCO • Connect terminal H on the feeder to terminal 1 on the LWCO 16 Feeder Wiring for Boilers Equipped with McDonnell & Miller #67 Low Water Cut-offs Figures 14a and 14b show feeder wiring for McDonnell & Miller #101A, McDonnell & Miller WF2-U-24 and Hydrolevel VXT24 feeders on boilers equipped with #67 low water cutoffs. The following points apply to all feeder wiring to #67 low water cut-offs: • Use a separate transformer to power the feeder. Do not use the transformer on the boiler. • It is not necessary to touch any of the 24 volt factory boiler wiring when connecting a feeder to a #67 equipped boiler. • Do NOT install a jumper between terminals 2 and 3 on the #67 low water cutoff. Indirect Water Heater Wiring Figure 15 shows field wiring for an indirect water heater. A Honeywell R845A or equivalent DPST relay and transformer is required. The high limit described in Part IX must also be supplied by the installer. A call for heat from the indirect water heater thermostat will energize the relay making both sets of contacts. One set of these contacts then energizes the circulator. The other set of contacts will make the “T” and “T” contacts on the burner primary control, firing the burner. If the boiler water temperature exceeds the high limit setting of 180F, the high limit will open the “T” - “T” circuit and the burner will shut down. If there is a call for space heat, the heating thermostat will make the “T”-”T” circuit and the boiler will fire without regard to the status of the indirect water heater. The low water cut-off and pressure limit control will interrupt 120 volt power to the burner in the event of a low water or excessive pressure condition. FIGURE 14a: WIRING MCDONNELL & MILLER 101A OR TWO-WIRE HYDROLEVELVXT-24 FEEDER TO BOILER EQUIPPED WITH #67 L.W.C.O. CAUTION DO NOT INSTALL JUMPER BETWEEN 2 & 3 ON #67 L.W.C.O. 17 1198 FIGURE 14b: WIRING MCDONNELL & MILLER WF2-U-24 FEEDER OR THREE-WIRE HYDROLEVEL VXT-24 FEEDER TO BOILER EQUIPPED WITH #67 L.W.C.O. CAUTION DO NOT...

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