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AquaStar NG - page 1
WARNING : Improper installation, adjustment , alterat ion, service or maint enance can cause injury or property damage. Refer to this manual. For assistance or additional information consult a qualified installer, service agency or the gas supplier . Upon completion of the installation, these instructions should be handed to the user of the applian ...
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AquaStar NG - page 2
2 6 720 606 446 This well engineered, gas water heater has all the fea- tures a water heater should have: It operates on the principle of heating water instantaneously “on demand”. When a hot water faucet is opened, cold water flows through the coils of the heat exc hanger in the Aquastar. This same flow opens the gas valve, and the burners are ...
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AquaStar NG - page 3
3 6 720 606 446 M I N I M U M I N S T ALLA TI O N C LE ARAN C E S FR OM C O M B U STI B LE AN D N ON C OM B U S TI B LE MA TE R IAL S FR O NT VI EW SIDE V IEW A Q U AST AR MO DE L 38B MODEL 38B TOP (A) 12 " FRONT (B) 4 " BACK 0 " SIDES 4 " FLOOR (C) 12 " VENT DIAMETER 4 " ...
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AquaStar NG - page 4
4 6 720 606 446 G E NE R AL R U LE S T O FOLL OW FOR SAF E OPE RA TION 1. Y ou should follow these instructions when you install your heater . In the United St ates: The installation must conform with local codes or , in the absence of local codes , the National Fuel Gas Code AN SI Z223. 1 / N FP A 54. In Canada: The Installation should conform wit ...
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AquaStar NG - page 5
5 6 720 606 446 COMBUSTION AIR REQUIREMENT The AquaStar water heater holds cold water in its copper heat exchanger and brass water valve when not in use. Because of this, any cold air that comes in through the unit’s vent pipe is capable of freezing these components. This Installation Manual specifies the minimum vertical vent pipe and the amount ...
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AquaStar NG - page 6
6 6 720 606 446 Appliances located in unconfined spaces: a) An unconfined space is one whose volume is greater than 50 cubic feet per 1 0 00 Btu per hour of the combined rating of all appliances installed in the space. That would be 2000 cubic feet for the AquaStar 38B alone. b) In unconfined spaces in buildings of conventional frame, masonry, or m ...
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AquaStar NG - page 7
7 6 720 606 446 VENTING V ent pipe connection . WARN IN G: Do not reduce t he vent pipe size. The heater must be vented to the outside following all local ordinances and specifications for installing a gas appliance vent or chimney . The heater must be located as close as practicable to a vertically rising c himney or vent that has a listed vent ca ...
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AquaStar NG - page 8
8 6 720 606 446 MASON RY CHI M NEY : Masonry chimneys shall be built and installed in accordance with N FP S 2 1 1 or local codes . A minimum 4” diameter gas vent pipe (metal double wall T ype B ), or an approved clay flue liner or a listed c himney lining system must be used when venting into a naturally drafting, internal masonr y c himney . Lo ...
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AquaStar NG - page 9
9 6 720 606 446 WARNING Note: The burners of an instantaneous “on demand” water heater such as the AquaStar are only on at the time that hot water is actually being used, the vent pipe is therefore cold except for the short durations when hot water is being used, it is therefore very important that the venting and air supply be adequate to prov ...
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AquaStar NG - page 10
10 6 720 606 446 Connecting the pressure relief valve (PRV) A listed pressure relief valve supplied with the heater must be installed at the time of installation. Should a discharge line be added to the PRV no valve is to be placed between the P RV and the heater . No reducing coupling or other restriction may be installed in the discharge line. Th ...
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AquaStar NG - page 11
11 6 720 606 446 LIGHTING INSTRUCTIONS (as seen on front cover of heater) 1. ST OP! Read the s afety information on the front panel of the heater . 2. The Gas valve must be turned off by sliding the gas valve button ( ) to the far left under the OFF ( ) mark. 3. W ait five ( 5) minutes to clear out any gas. If you smell gas, ST OP! Follow “B” i ...
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AquaStar NG - page 12
12 6 720 606 446 Fig. 6 - Water Flow Control Knob The position you select on the temperature adjustment knob will depend on the temperature of the incoming water (50°F is average in the U.S.). If you plan to supply the AquaStar 38 B, with preheated water (i.e.) solar installation, the unit could overheat. It will then shut off on safety when the o ...
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AquaStar NG - page 13
13 6 720 606 446 PIL O T DO ES N O T LI GHT 1 . No gas to t he Aquastar A . Gas cock on gas line may not be open. B . Gas valve button has not been moved to “PI L O T POSITION”. Slide button to right to single flame position ( ) . 2. In-line Aquastar gas regulator jammed (usually on LP gas) Replace or unlock the regulator . Note : T he regulato ...
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AquaStar NG - page 14
14 6 720 606 446 B UR N ERS DO N O T IG N ITE WH EN H O T WA TE R IS TU RN E D ON 1 . Pilot is not on. Light the pilot. See lighting instructions. 2 . Pilot lighting push button not turned to proper position Be sure that once the pilot flame is on, that the gas valve button ( ) is slid all the way to the right to the ON position ( ). 3 . Cold incom ...
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AquaStar NG - page 15
15 6 720 606 446 4 . Btu input is too low due to insufficient gas supply Make sure your main gas line is fully opened. If using LP gas, be sure that the size of the propane tank is adequate to supply the required gas pressure. 5. Cold water is mixing with the hot water between the AquaStar and the outlet Compare water temperature at outlet of the A ...
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AquaStar NG - page 16
16 6 720 606 446 Fig. 9 - Diagram of AquaStar 38 B 2 4 8 10 1 7 9 11 1 . Heat exchanger 2. Pilot assembly 3. Burner manifold gas pressure test nipple 4. Pilot gas tubing 5. Main gas burner 6. Inlet gas pressure test nipple 7 . Gas valve 8. Gas control slide 9. Piezo igniter 1 0. T emperature adjustment knob 1 1 . W ater valve 3 5 6 ...
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AquaStar NG - page 17
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AquaStar NG - page 18
18 6 720 606 446 Fig. 1 0 - I NTE RI OR COM P ON ENTS D IA G R AM AND P ARTS LI ST ...
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AquaStar NG - page 19
19 6 720 606 446 Fig. 1 0 INTERIOR COMPONENTS DIAGRAM AN D P ARTS LIST 3 8B 1 Cover 8 705 4 21 021 2 Temp eratu re ad justme nt kno b 8 702 000 182 4 Dra ft diver tor 8 705 5 05 361 5 Hea t excha nge r 8 70 5 406 149 6 Overh eat s ensor (ECO) 8 70 7 206 040 7 Hot water pipe 8 700 7 03 038 8 Main b urner asse mbly 8 708 1 20 301 LPG Mai n burn er as ...
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AquaStar NG - page 20
20 6 720 606 446 Fig . 1 1 - Flow chart of Aquastar 3 8 B ...
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AquaStar NG - page 21
21 6 720 606 446 LI M ITE D W AR R ANT Y Aquast ar General Aquastar water heaters are warranted by the Manufacturer ( B OSC H) through BB T North America . BB T North America (B BTNA ) will furnish a replacement heat exc hanger and will furnish a replacement of any other part which fails in normal use and service within the applicable periods speci ...
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AquaStar NG - page 22
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AquaStar NG - page 23
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AquaStar NG - page 24
Bosch Heating System Co. Foschan Guangdong C. T . 5283 1 5 P .R . China Recycled paper 3 1 & 2 1 s e g a p e e s E L B A T E C N A N E T N I A M R A E Y Y R E V ES R A E Y 2 Y R E V ES R A E Y 5 - 3 Y R E V E E V L A V R E T A W E T A C I R B U L † E V L A V R E T A W D L I U B E R † N E E R C S R E T L I F R E T A W T C E P S N I † Y L B ...
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