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Hersteller: Bosch Dateigröße: 438.72 kb Dateiname: 125BL_manual.pdf Unterrichtssprache:

This is necessary to prevent pilot outage due to overheating. The temperature slide control on the 125BL may also need to be lowered to prevent overheating. WATER IS TOO HOT 1. Gas flow is higher than necessary. Move gas control slide to the left. 2. Temperature (aquastat) control is set too high If unit is plumbed in a recirculating loop system the aquastat temperature relay for the primary circulator pump is possibly set too high. WATER 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. Temperature (aquastat) control is set too low If unit is plumbed in a recirculating loop system the aquastat temperature relay for the primary circulator pump is possibly set too low. 4. Btu input is too low due to insufficient gas pressure It is extremely important for a tankless instantaneous water heater to have the right size gas line to obtain the correct gas pressure See specifications on page 2. Unlike storage tank water 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 affect the water temperature at the time of usage. See pages 2 for correct gas pressure settings. 5. 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. 6. Cold water is mixing with the hot water between the AquaStar and the outlet Compare water temperature at outlet of the AquaStar (hold the AquaStar’s outlet pipe with your hand) and at the tap. If these two are very different, check for mixing valve or plumbing crossover (see “MAIN BURNERS WILL NOT IGNITE...” paragraph #5). 7. Parts in water flow valve are corroded so that the gas passage is not fully opening Contact your service person or Controlled Energy. HOT WATER TEMPERATURE FLUCTUATES 1. Cold water is mixing with the hot water between the AquaStar and the outlet (if not being used with a circulator pump) See #5 under “Burners do Not Ignite When Hot Water Turned On”. 2. Storage in tank (recirculating system) has not fully recovered Storage capacity in tank is inadequate. Increasing tank size, setting slide control higher for a fast recovery or adding a second 125BL for even a faster recovery is suggested. 3. Insufficient gas pressure Note required gas pressures (page 2) and consult gas service person. Fig. 10 - Diagram of AquaStar 125 BL 1 2 5 4 6 8 7 9 10 11 1. Heat exchanger 7. Gas control slide 2. Pilot assembly 8. Piezo igniter 3. Burner manifold gas 9. Location of pressure tap pressure test nipplenipple 4. Pilot gas tubing10. Water valve 5. Main gas burner11. Gas inlet gas pressure 6. Gas valvetest nipple 14 Fig. 11 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 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 exchanger washer ¤ 8 710 103 045 9 Overheat sensor (ECO) ¤ 8 707 206 017 10 Main burner assembly LPG 8 708 120 296 Main burner assembly NG 8 708 120 298 11 Pilot burner assembly ¤ 8 708 105 337 11a Pilot filter screen ¤ 8 700 507 055 12 Piezo electrode ¤ 8 708 107 002 13 Pilot orifice NG 8 708 200 005 “ LPG 8 748 200 173 14 Pilot Tube ¤ 8 710 707 166 15 Thermocouple ¤ 8 747 202 083 16 Burner assembly washer ¤ 8 710 103 060 17 Throttle disc LPG 8 700 100 174 18 Gas valve NG 8 707 011 460 Gas valve LPG 8 707 011 464 19 Gas supply pipe ¤ 8 700 705 464 20 Electromagnet ¤ 8 747 201 094 21 Electromagnet washer ¤ 8 700 103 144 22 Gas filter ¤ 8 700 507 051 23 Thermocable ¤ 8 747 202 078 24 Water valve assembly ¤ 8 707 002 478 25 Water valve repair kit ¤ 8 703 406 214 26 Water valve diaphragm ¤ 8 700 503 043 27 Slow ignition valve ¤ 8 708 503 060 28 Water valve setting screw ¤ 8 703 404 098 29 O ring setting screw ¤ 8 700 205 050 30 Water valve piston assembly ¤ 8 708 500 230 31 Water valve venturi ¤ 8 708 205 248 32 Water inlet filter ¤ 8 700 507 059 33 Water elbow fitting ¤ 8 700 703 114 INSTALLATION CHECKLIST GAS LINE SIZE Natural Gas Nominal Iron Pipe Size* 1/2" 3/4" 1" MAXIMUM LENGTH 10' 40' 150' Liquid Propane Semi-rigid Tubing 1/2" 5/8" 3/4" 7/8" MAXIMUM LENGTH NOT RECOMMENDED 20' 60' 150' * Flex tubing greatly reduces capacity and, therefore, is not recommended. Minimum Vent Size* and Height Minimum Diameter Minimum Height** 5 inches 6 feet** * NOTE: Vent size must not be restricted. Installation must comply with national fuel gas code venting requirements for a 117,000 Btu Category I appliance and any applicable local codes. ** NOTE: Minimum vent height must be 6 feet, provi...

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