Bosch 125B NGL - Manuals

5 7. Correct gas pressure is critical for the optimumoperation of this heater (see specifications on page 2). Gaspiping must be sized to provide the required pressure atthe maximum output of the heater, while all the other gasappliances are in operation. Check with your local gassupplier, and see th...

6 dilution of flue gases.Appliances located in confined spaces:) The confined spacemust be provided with two permanent openings, onec o m m e n c i n g w i t h i n 1 2 i n c h e s o f t h e t o p a n d o n ecommencing within 12 inches of the bottom of theenclosure. Each opening must have a minimum f...

7 Fig. 3 - Flue Adaptor for High Altitude Canadian Installations WARNING: Failure TO INCREASE THE VENT SIZE TO SIX INCHES AND/or assure that the manifold pressureis set to proper value listed for applications at high altitudeswill cause unsafe venting, asphyxiation, and will void CSACertification. G...

8 THREADED ASSEMBLY SWEATED ASSEMBLY 1/2” FLEX PIPE PRV TOAPPROPRIATEDISCHARGE S FITTING PIPE PRV TOAPPROPRIATEDISCHARGE 1/2” FLEX Fig. 6-Plumbing connections for the Aquastar 125BL NOTE: Do not apply soap solution to pilot filter screen orpilot orifice area. If you have a leak, shut off the gas. Af...

9 Fig. 7 - Pressure Relief Valve Connecting the pressure relief valve (PRV)A listed pressure relief valve supplied with the heater mustbe installed at the time of installation. No valve is to beplaced between the PRV and the heater. No reducingcoupling or other restriction may be installed in the di...

10 To clean the pilot burner and/ or the pilot orifice : Turnoff the gas at the unit. Remove the cover of the heater. Todo so, remove incandescent particle tray and unscrew thecentral screw located at the bottom of the front cover. Pullmain cover out toward you and lift up and out. Pull the airscree...

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 regulatorfurnished with the heater is designed for low gas pressure.Excessive pressure will lock it up (propane only).Jamming usually happens if the gas ...

12 temperature relay for the primary circulator pump is possiblyset too high. WATER IS NOT HOT ENOUGH 1. Water flow rate is too high.Decrease the flow rate. 2. Gas flow is not optimalMove gas control slide to the right. 3. Temperature (aquastat) control is set too lowIf unit is plumbed in a recircul...

14 Fig. 11 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST

15 Fig. 11 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125BL 1 Cover ¤ 8 705 421 031 2 Cap cover ¤ 8 703 304 011 3 Water 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 exchan...

Replacement Parts available from North American Distributor CONTROLLED ENERGY CORP. 340 Mad River Park Waitsfield, Vermont 05673 Phone 800-642-3111 Fax (802) 496-6924 www.controlledenergy.com [email protected] VULCANO Termodomésticos S.A. Estrada de Cacia 3801 - 856 Aveiro - PORTUGAL...