Instruction/ maintenance manual of the product 750 A.O. Smith
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1 W ARNING: If the information in this manual is not followed exactly , a fire or explosion may result causing property damage, personal injury or loss of life. — Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
2 SAFE INST ALLA TION, USE AND SERVICE Y our safety and the safety of others is extremely important in the inst allation, use, and servicing of this boiler . Many safety-related messages and instructions have been provided in this manual and on your own boiler to warn you and others of a potential injury hazard.
3 GENERAL SAFETY.
4 SAFE INST ALLA TION, USE, AND SERVICE ....................................................................................................................................... 2 GENERAL SAFETY ..........................................................
5 For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled water heaters installed in every dwelling, building or structure used in whole or in p art.
6 CONNECTION DIAGRAM.
7.
8 SCHEMA TIC DIAGRAM VB/VW-500, 750 & 1000 SCHEMA TIC DIAGRAM.
9 LIGHTING & OPERA TION INSTRUCTIONS FOR MODELS VB/VW 500, 750 AND 1000:.
10 children to use a hot water t ap, or to draw their own bath water . Never leave a child or disabled person unattended in a bathtub or shower . The boiler should be located in an area that is inaccessible to the general public. T ABLE 1. Risk of Scalds.
11 sequences and safety features associated with a gas ignition control system. The system continuously performs various diagnostic test s to verify proper appliance and control operation.
12 the temperature is less than the operating setpoint minus the differential temperature and the thermostat input is closed then a call for heat is established and the system shift s to the run mode (green "Running" LED turns on). 5. The heating sequence begins by applying power to the pump.
13 waits for a heat request (determined by the Thermost at or controlling probe input s). All outputs are o f f i n this st ate except that if the Post-Circulate time i s set to continuous, th e pump will be on. When the heat request i s received, the system moves to the Pre-Circulate state.
14 if the blower prover does not activate after 15 seconds. This time allows the blower relay to activate, the blower to come up to speed, and the response from the blower prover to be filtered. • User Settings Screen: Each setpoint or user setting has either a limited selection of values, or a limited range of values.
15 kBtu rating of the boiler (0 to 5750kBtu in 10kBtu increments) The sof tware revision level of the MCB. • Current Error Screen: Displays the last error that the system has detected plus a time stamp of when the error occurred. (The time st amp is based on the elapsed hours value at the time the error occurred.
16 TROUBLESHOOTING IGNITION SYSTEM Fault Messages and Lockout S tatus (* = stage number: 1, 2, 3, or 4) FAUL T DISPLA YED DESCRIPTION RED LED LOCKOUT “Display Fail” Communications with UIM interrupted Continuous Auto Reset Check communication cable to UIM.
17 This is a pre-mix burner system. The flame is not supposed to be directly on the burner . The flame should be just above the burner deck approximately 1/8” and blue in color , see illustration. BURNER FLAMES Visually check flame characteristics through the view port located on the top head of the boiler .
18 Any safety devices including low water cutoffs used in conjunction with this boiler should receive periodic (every six months) inspection to assure proper operation. A low water cutoff device of the float type should be flushed every six months. Periodic checks, at least twice a year , should be made for water leaks.
19 lines with air or water and clear or replace the blocked portions of the line as necessary . Note that areas of the drain line which include a sag or low spot in the line will also form a condensate trap which can be removed by levelling the tube and does not indicate a blocked system.
20 NOTES.
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22 NOTES.
23 LIMITED W ARRANTY A. O. Smith Corporation, the warrantor , extends the following LIMITED WARRANTY to the owner of this boiler: 1. If within TEN years after initial inst allation of the boiler, a he.
24 500 T ennessee W altz Parkway , Ashland City , TN 37015 Phone: 800-433-2545 w w w .hotwater .com E-Mail: p art s@hotwater .com.
An important point after buying a device A.O. Smith 750 (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 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 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, A.O. Smith 750 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 will certainly help you make a decision on the purchase.
If you already are a holder of A.O. Smith 750, 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.
However, one of the most important roles played by the user manual is to help in solving problems with A.O. Smith 750. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device A.O. Smith 750 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
