Instruction/ maintenance manual of the product 750 SERIES A.O. Smith
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1 A DIVISION OF A. O. SMITH CORPORA TION MC BEE, SC., RENTON, WA., STRA TFORD-ONT ARIO, VELDHOVEN-THE NETHERLANDS w w w .hotwater .com GAS-FIRED COMMERCIAL COPPER BOILERS FOR HYDRONIC HEA TING AND HOT.
2 Lighting Instructions for the G(B/W) 300 through 750 models THE UNIT SHOULD NOT BE INST ALLED DIRECTLY ON A CARPETED FLOOR. A FIRE HAZARD MA Y RESUL T . Instead, the boiler must be installed on the A. O. Smith Combustible Floor Kit Base or concrete blocks extending beyond the full width and depth of the boiler by at least 3 (76.
3 LIGHTING INSTRUCTIONS These models have an automatic hot surface ignition system mounted on the combustion chamber panel inside the front jacket. This hot surface igniter ignites the main burner gas whenever the system control calls for heat.
4 the surrounding air pressure. Inspection of the boiler and vent system is necessary to insure that flue gas leakage to the surrounding area does not occur .
5 Figure 1A. CCB (Drawing #211758).
6 Figure 1B. FCB (Drawing #211759).
7 Figure 1C. PDB (Drawing #211760).
8 closed and everything else is in the proper state, a "call for heat" condition will be initiated. These leads should be shorted together, when a thermostat is not being used.
9 CCB - Three position Dipswitch (Flame Control Section): This dipswitch is similar to the FCB dipswitches described below , but with only three switches being used: the number of blower speeds (switch #3), Hi Gas option (switch #2) and a spare (switch #1).
10 • S tored values are recalled from memory . • Configuration dipswitches are read. • Pending faults are recalled • Micros on all boards start running (indicated by a flashing Y ellow LED nea.
11 The operation of these parts is described below: UIM Screens: On all screens a double vertical bar appears on the right side of the display each time a key is touched to indicate that a key has been activated. On several screens an indicator ">" appears on the left side of the display to indicate the active line.
12 except the fault states. If enabled the powered vent and the IRI gas valve are turned on. A command is sent to all active stages to cold purge the system. Cold purging clears out any combustion gas that may be in the combustion chamber . When purging is complete the system moves to the Heat S tate.
13 • User Settings Screen: Each setpoint or user setting has either a limited selection of values, or a limited range of values. The Up/Down keys are used to change values. After changing an item, the Select key is pressed to accept the change, or the Menu key is pressed to reject the change and restore the item to its original value.
14 CONNECTION DIAGRAM (Drawing #21 1769) FIGURE 4..
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16 Number of cycles for each stage (Number of times stage has been in heat mode). Kbtu rating of the boiler (0 to 5750Kbtu in 10Kbtu increments) The software revision level of the CCB, and FCB micro- controllers. Current Error Screen: • Displays the last error that the system has detected plus a timestamp of when the error occurred.
17 TROUBLESHOOTING IGNITION SYSTEM Fault Messages and Lockout S tatus (* = stage number: 1 or 2) Fault Displayed Description Red LED Lockout “Display Fail” Communications with UIM interrupted Continuous Auto Reset • Check communication cable to UIM.
“Blocked Flue” Flue is Blocked Continuous SOFT • Caused by the blocked flue switch contacts being open when they should have been closed. Check for flue blockage, switch contacts, wiring.
Other troubleshooting hints: 1. Input switches can be easily checked by observing their activation on the UIM System S tatus screen. Force the boiler to remain in the S t andby mode by opening the Thermost at input or by setting the operating setpoint to the minimum so that the system does not request heat.
20 NOTES.
21 NOTES.
22 NOTES.
23 NEW BOILER LIMITED W ARRANTY A. O. Smith Corporation, the warrantor , extends the following LIMITED W ARRANTY to the owner of this hydronic boiler: 1.
24 A DIVISION OF A. O. SMITH CORPORA TION MC BEE, SC., RENTON, WA., STRA TFORD-ONT ARIO, VELDHOVEN-THE NETHERLANDS w w w .hotwater .com.
An important point after buying a device A.O. Smith 750 SERIES (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought A.O. Smith 750 SERIES yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data A.O. Smith 750 SERIES - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, A.O. Smith 750 SERIES you will learn all the available features of the product, as well as information on its operation. The information that you get A.O. Smith 750 SERIES will certainly help you make a decision on the purchase.
If you already are a holder of A.O. Smith 750 SERIES, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime A.O. Smith 750 SERIES.
However, one of the most important roles played by the user manual is to help in solving problems with A.O. Smith 750 SERIES. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device A.O. Smith 750 SERIES along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
