Bosch Appliances 125B NGL manual

W ARNING : Improper inst allation, 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 applian[...]

2 This well engineered, gas water heater has been specially designed to operate as a circulating water heater . FEA TURES - High Quality Materials for Long Working Life. - Copper heating coils for endless supply of hot water . - Safety thermocouple at pilot burner . - Automatic overheating protection shut-off sensor . - Stainless steel burners with[...]

3 D861_059 MINIMUM INST ALLA TION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MA TERIALS FOR ALCOVE OR CLOSET INST ALLA TIONS FRONT VIEW SIDE VIEW AQUAST AR MODEL 125BL M O DE L 125B L T O P ( A ) 12" FRONT ( B ) 4" BAC K 0 " SI D ES 4 " FL OOR ( C) 1 2 " * F L UE D I AMET ER 5 " * Some local codes require 18” in[...]

4 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 suit able for pot able water , (b) toxic chemicals such as those commonly used for boiler treatment to prevent corrosion and freezing must not be introduced into the sys[...]

5 7 . Correct gas pressure is critical for the optimum operation of this heater (see specifications on page 2). Gas piping must be sized to provide the required pressure at the maximum output of the heater , while all the other gas appliances are in operation. Check with your local gas supplier , and see the section on connecting the gas supply . 8[...]

6 dilution of flue gases. 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 in[...]

7 Fig. 3 - Flue Adaptor for High Altitude Canadian Installations W ARNING : Failure T O INCREASE THE VENT SIZE TO SIX INCHES AND/or assure that the manifold pressure is set to proper value listed for applications at high altitudes will cause unsafe venting, asphyxiation, and will void CSA Certification. GAS CONNECTIONS and Gas Regulator Before conn[...]

8 THREADED ASSEMBL Y SWEA TED ASSEMBL Y 1/2” FLEX PIPE PRV TO APPROPRIA TE DISCHARGE S FITTING PIPE PRV TO APPROPRIA TE DISCHARGE 1/2” FLEX Fig. 6-Plumbing connections for the Aquastar 125BL NOTE: Do not apply soap solution to pilot filter screen or pilot orifice area. If you have a leak, shut off the gas. Af ter verifying that required gaskets[...]

9 Fig. 7 - Pressure Relief V alve Connecting the pressure relief valve (PRV) A listed pressure relief valve supplied with the heater must be installed at the time of installation. No valve is to be placed between the PRV and the heater . No reducing coupling or other restriction may be installed in the discharge line. The discharge line must be ins[...]

10 T o clean the pilot burner and/ or the pilot orifice : T urn of f the gas at the unit. Remove the cover of the heater . T o do so, remove incandescent particle tray and unscrew the central screw located at the bottom of the front cover . Pull main cover out toward you and lift up and out. Pull the air screen off, wash it and blow any lint of f ([...]

11 C . Gas regulator may be shut or damaged. 2. In-line AquaStar gas regulator jammed (usually on LP gas) Replace or unjam the regulator . Note: The regulator furnished with the heater is designed for low gas pressure. Excessive pressure will lock it up (propane only). Jamming usually happens if the gas pressure between the gas tank (propane) and t[...]

12 temperature relay for the primary circulator pump is possibly set too high. WA TER IS NOT HOT ENOUGH 1. Water flow rate is too high. Decrease the flow rate. 2. Gas flow is not optimal Move gas control slide to the right. 3. T emperature (aquast at) control is set too low If unit is plumbed in a recirculating loop system the aquastat temperature [...]

13 Fig. 10 - Diagram of AquaStar 125 BL 2 4 6 7 1 5 8 10 1. Heat exchanger 2. Pilot assembly 3. Burner manifold gas pressure test nipple 4. Pilot gas tubing 5. Main gas burner 6. Gas valve 7. Gas control slide 8. Piezo igniter 9. Location of pressure tap nipple 10. W ater valve 1 1. Gas inlet gas pressure test nipple 3 11 9[...]

14 Fig. 1 1 - INTERIOR COMPONENTS DIAGRAM AND P ARTS LIST[...]

15 Fig. 1 1 INTERIOR COMPONENTS DIAGRAM AND P ARTS LIST 125BL 1 Cover ¤ 8 705 421 031 2 Cap cover ¤ 8 703 304 01 1 3 W ater connection gasket ¤ 8 710 103 043 4 Draft divertor ¤ 8 705 505 354 5 Heat exchanger ¤ 8 705 406 235 6 Hot water pipe ¤ 8 700 705 431 7 Cold water pipe ¤ 8 700 705 294 8 Heat exchanger washer ¤ 8 710 103 045 9 Overheat [...]

Replacement Parts available from North American Distributor CONTROLLED ENERGY CORP . 340 Mad River Park W ait sfield, V ermont 05673 Phone 800-642-31 11 Fax (802) 496-6924 ww w .controlledenergy .com techsuppport@controlledenergy .com VULCANO T ermodomésticos S.A. Estrada de Cacia 3801 - 856 Aveiro - PORTUGAL GA S LI NE SI ZE Nat ur al G as Nom i [...]