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wide n Multiple boiler systems provide increased turndown and even smoother, more efficient system operation n 4 boilers w/4:1 Turndown =16:1 total system turndown 40 100 140 VW/ VB-500 500,000 421,500 1,268 507 362 56 30 37.5 30 450 VW/ VB-750 750,000 633,750 1,901 761 543 62 30 37.5 30 575 VW/ VB-1000 1,000,000 845,000 2,535 1,014 724 71 30 37.5 30 750 With Ac-U-Temp, A. O. Smith makes it as easy as possible to install a complete packaged hot water supply system, combining 88% efficient VF Ser

NOTE: Do not use a push type ratchet screwdriver. 1. Strip 7/16 in. of insulation from the wire end. 2. Wrap the wire at least three-fourths of the distance around the screw as shown. 3. Using a standard, flat-headed screwdriver, tighten the screw until the wire is snugly in contact with the screw and contact plate. 4. Tighten the screw an additional one-half turn. Fig. 4—Typical hookup for L8151A in a single zone system. L1 (HOT) L2 1 2 3 1 2 3 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOA

Because the and post purge operating states and at lower speeds sensing tubes are T fitted together it is not con- during all other operating states. High blower prover clusive which BPS is at fault. IE: a leaking diaswitch contacts must close during the pre and post phragm on the Low BPS could prevent the High purge states ONLY and open during all other BPS from closing its contacts. Therefore - operating states. replace both the High and Low BPS. OR Normally Open Low Blower Prover pressure swi

Ball Valve...............................................................191935 2......Tank/Pump Kit (LW Models Only - Not Shown)......210625 3......Hex Reducing Bushing (LB Only).......................... 91940-8 4......Flush Bushing (LB Only).......................................192163-2 5...... Relief Valve (LW Model)........................................ 98883-3 Relief Valve (LB Model).........................................210451-2 6......Strap, Cable (not shown).............

Keep pH of water between 7.0 to 8.5. Popping or percolating noise heard in boiler Mineral deposits in sections due to constant use of makeup water Call qualified service technician to de-lime boiler, if necessary. In some cases, deposits will be too heavy to remove with de- liming procedures. Have qualified service technician repair leaks to eliminate need for constant makeup water. Incorrect pH of boiler water Call qualified service technician to check pH level and correct. pH should be maintai

8. 7. Tighten draw nut until mounting clamp is firmly attached to well spud and wires are held securely in place. CAUTION Do not secure draw nut so tightly that mounting clamp collapses tubing. Fig. 8. Immersion well fitting for sensor. Wiring Disconnect power supply before installation to prevent electrical shock or equipment damage. All wiring must comply with local codes and ordinances regarding wire size, type of insulation, enclosure, etc. SENSOR WIRES M23086A HEAT-CONDUCTIVE COMPOUND (OPTI

When the water temperature drops below the setpoint minus the differential, the control restarts a heat cycle to re-heat the tank of water. If the water temperature exceeds the max allowed temperature, the control enters a manual reset lockout state. For models that have reset capability, press any onboard button (when present), cycle power, or use the remote display to reset. CHECKOUT Put the system into operation and observe operation through at least one complete cycle to make sure that the c

Table 6. Pin Configuration. Wire Harness Housing Pin Configuration Pin/Socket Molex® Number Line In pin 02-08-2004 Transformer Primary socket 02-08-1002 Transformer Secondary socket 02-08-1002 Circulator pin 02-08-2004 Damper pin 03-06-2103 Inducer socket 39-00-0039 Control socket 02-08-1002 Sensor 1 socket 08-50-0106 Sensor 2 socket 08-50-0106 E-COM Diagnostic socket 08-50-0114 Temperature Control Temperature control setpoint on the module can be adjusted as described in the following sections.

5. Hot Surface Ignition Wiring (S937X). Common Connectors Table 3. Connectors Common to Both Spark-to-Pilot and Hot Surface Ignition Options. Connection/Color Pin Mating Plug Description Flame Sense 1 of 1 3/16 in. female quick- connect Connection to Flame Rod Sensor 1/White 1 of 3 Molex® 43061-0003 NTC 1-1 2 of 3 Sensor Common 3 of 3 NTC 1-2 Sensor 2a/White 1 of 2 Molex® 43061-0002 NTC Temperature Sensor 2 of 2 69-2076—01 8 S9360A, S9361A, S9370A, S9371A INTEGRATED BOILER CONTROLLERS S9360A, S9