AquaStar 38B NG manual

W ARNING : Improper installation, adjustment, alteration, service or maintenance 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 applianc[...]

2 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 exchanger in the Aquastar . This same flow opens the gas valve, and the burners are ignited by th[...]

3 If you are using the AquaStar for combined space heating and potable water heating (see schematic diagram below) , all piping and other components connected to the system must be suitable for potable water , (b) toxic chemicals such as those commonly used for boiler treatment to prevent corrosion and freezing must not be introduced into the syste[...]

4 GENERAL RULES T O FOLLOW FOR SAFE OPERA TION 1. Y ou should follow these instructions when you install your heater . In the United States: The installation must conform with local codes or , in the absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFP A 54. In Canada: The Installation should conform with CGA B149.(1,2) INST ALLA TION[...]

5 Appliances located in confined spaces:) The confined space must be provided with two permanent openings, one commencing within 12 inches of the top and one commencing within 12 inches of the bottom of the enclosure. Each opening must have a minimum free area of one square inch per: - 1000 Btu/hr if all air is taken from inside the building. - 200[...]

6 W ARNING 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 venting stack 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 provide a goo[...]

7 Fig. 3 - W ater valve, top view 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 PRV and the heater . No reducing coupling or other restriction may be installed in the di[...]

8 Fig. 6 - W ater Flow Control Knob What is the best temperature setting? Because AquaStar water heaters deliver endless hot water at the temperature you have selected, there is no need to produce very hot water and then mix in cold. It just does not make sense to overheat water and then mix in cold to cool it off. Y ou cannot run out of hot water [...]

9 Fig. 8 - Pilot burner with air screen/ pilot orifice Fig. 7 - Characteristic Pilot Flame MAINTENANCE AND SERVICE Approximately once a year , the AquaStar should be checked, cleaned and serviced as necessary . T o remove the front cover , first remove the incandescent particle tray , then pull off the temperature adjustment knob, unscrew and remov[...]

10 TROUBLE SHOOTING Introduction The AquaStar 38 burners are ignited by a water flow valve. Numerous water related problems can cause this water valve to malfunction such as: Insufficient water flow volume to activate the burners at its minimum flow requirement; Dirt in the water flow valve causing it to malfunction; Sediment build-up in faucet aer[...]

11 BURNERS DO NOT IGNITE WHEN HOT W A TER IS TURNED 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 incoming water connection made to w[...]

12 heaters, the burners of a tankless water heater must be very powerful to heat water instantaneously since they do this only at the time hot water is actually being used. It is therefore imperative that the gas pressure requirement be met exactly . Insufficient gas pressure will directly af fect the water temperature at the time of usage. See pag[...]

13 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 10. T emperature adjustment knob 1 1. W ater valve 3 5 6[...]

Fig. 10 - INTERIOR COMPONENTS DIAGRAM AND P ARTS LIST[...]

Fig. 10 INTERIOR COMPONENTS DIAGRAM AND P ARTS LIST 38B 1 Cover ¤ 8 705 421 021 2 T emperature adjustment knob ¤ 8 702 000 182 3 Panel back ¤ 8 705 402 170 4 Draft divertor ¤ 8 705 505 361 5 Heat exchanger ¤ 8 705 406 233 6 Overheat sensor (ECO) ¤ 8 707 206 040 7 Hot water pipe ¤ 8 700 703 038 8 Main burner assembly LPG 8 708 120 301 Main bu[...]

GA S LINE SIZE Natural Gas Nominal Iron Pipe Size* 3/8" 1/2" MAXIMUM LENGT H 20' 80' Liquid Pr opane Semi-rigid Tubing 3/8" 1/2" MAXIMUM LENGT H 10' 60' * Flex tubi ng gr eatly r educes capacity and, therefore, is not r ecommended. Minimum Vent Size* and Height Minimum Diameter Minimum Height** 4 inches 6 fee[...]