valutazioni - 4, GPA: 4
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Then tighten down the lock nut. Caution: Never back the adjuster nut downward to the last thread unless the thermostat is being replaced. This is a gas seal. WATER IS NOT HOT ENOUGH 1. Water flow rate is too high. Decrease the flow rate. 2. 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 6 720 606 518 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 page 2 for correct gas pressure settings. 3. Thermostat calibration is incorrect or thermostat is defective. Contact your service person or call CEC. 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 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 #6). 6. Parts in water valve are dirty or damaged, which will prevent the gas valve from being fully opened. Water valve maintenance needs to be performed, see #7 under BURNERS DO NOT IGNITE WHEN HOT WATER IS TURNED ON. HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED 1. Unbalanced pressure in waterlines The added restriction caused by the Aquastar in the hot water system can result in uneven pressures between the cold and the hot. In such cases when mixing cold water at the tap, the lower hot water pressure may be overpowered by a much higher cold water pressure, which may cause the Aquastar burners to shut down (deactivate). Make sure faucet aerators or shower heads are free of minerals. Do not add any flow restrictor to the shower head. Typically this deactivation symptom is a result of the hot water being too hot to use comfortably. Warm inlet water generally causes this. Lowering the control knob setting and/or reducing the inlet gas supply to the heater should correct this deactivation symptom. 2. Inlet water pressure is erratic due to inadequate supply water pressure or saturated pressure tank on well system For installation on a private well system with the use of a pressure tank, the lowest pressure range setting recommended is 30-50 psi (2.07-3.45 bar). Confirm that the pressure tank is not water logged. 3. Cold water is mixing with the hot water between the AquaStar and the outlet See #6 under “MAIN BURNERS DO NOT IGNITE WHEN HOT WATER TURNED ON”. 4 . Insufficient gas pressure Note required gas pressures (page 2) and consult gas service person. 6 720 606 518 Fig. 10 -Diagram of AquaStar 125 BS 1 2 4 5 6 7 8 9 10 1. Heat exchanger 6. Gas valve 2. Pilot assembly 7. Piezo igniter 3. Burner manifold gas 8. Location of pressure tap pressure test nipple screw 4. Main gas burner 9. Water valve 5. Pilot gas tubing 10. Gas inlet gas pressure test nipple 6 720 606 518 18 6 720 606 518 AQ 125 BS Fig. 11 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST Fig. 11 INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 125BS 1 Cover 8 705 421 033 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 8 705 406 189 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 8 708 120 296 LP Main burner assembly 8 708 120 298 NG 11 Pilot burner assembly 8 718 105 051 11a Pilot filter screen 8 700 507 055 12 Piezo electrode 8 708 107 002 13 Pilot orifice 8 708 200 005 NG Pilot orifice 8 748 200 173 LP 14 Pilot Tube 8 710 707 166 15 Thermocouple 8 747 202 083 16 Burner assembly washer 8 710 103 060 17 Gas valve 8 707 011 467 LP Gas valve 8 707 011 469 NG 18 Gas supply pipe 8 700 705 464 19 Electromagnet 8 747 201 094 20 Electromagnet washer 8 700 103 144 21 Gas filter 8 700 507 051 22 Thermocable 8 747 202 078 23 Thermostat 8 707 206 039 24 O ring Thermostat 8 700 205 101 25 O ring Thermostat 8 700 205 041 26 Water valve assembly 8 707 002 393 27 Pushrod 8 703 406 204 28 Water valve diaphragm 8 700 503 050 29 Slow ignition valve 8 708 503 062 30 Water valve setting screw 8 703 404 092 31 O ring setting screw 8 700 205 050 32 Water valve venturi 8 708 205 235 33 Water valve piston assembly 8 708 500 230 34 Water inlet filter 8 700 507 059 35 Water elbow fitting 8 700 703 114 36 Water valve set screw 8 703 401 051 6 720 606 518 Fig. 12 -Flow chart of Aquastar 125 BS 6 720 606 51...
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