AquaStar 170 VP manual Do not enlarge the orifice, Characteristic Pilot Flame

valve discharges by itself, a problem exists and service is required. This could be due to a de- fective relief valve or to overheating.

Pilot Flame: The pilot flame should burn with a clean sharp blue flame and should resemble Fig.4 below. If the flame is yellow, or if the cen- tral button Fig.2 (P) has to remain depressed for a long time in order to keep the pilot lighted, the pilot may need to be cleaned or the orifice replaced.

to burners - - to thermocouple

Fig. 4 Characteristic Pilot Flame

To clean the pilot:Turn off the gas at the unit

(L)Fig.2. Remove the front panel (unscrew screws at bottom of corners of front panel, pull out and lift panel off). Disconnect the Pilot Tube

(S)Fig.2 at its base and blow gently through it (see diagram of Pilot Assembly, page 19). Be careful not to lose the pilot orifice and washers. Remove and clean pilot filter by peeling off the outer layer. Do not use any wire or sharp object to clean orifices. Natural gas orifices are large enough that you can usually clean them by blowing through them. LP orifices are too small to clean and should be replaced.

Do not enlarge the orifice.

Main Burner Flames: The main burner flames should be blue, with a more intense blue cone in the center core. Compare with Fig 5 in op- posite column. Yellow flames could be a sign of wrong size gas orifices or dirty burners. If some burners have yellow flames while others have good flames, it is likely that dust, lint or spider webs have partially clogged the burner venturi.

Wash the stainless steel burners if they are dirty. Burners can be detached from the heater by removing the pilot tube and the thermocouple assembly and disconnecting the Energy-Cut- Off switches.

(Do not lose the retaining clip) The burners are secured to the main frame by two screws on either side. Do not remove the five screws across the front of the burner assembly. Also examine heat exchanger fins for dirt. Brush and vacuum if dirty. Burnt edges at the bottom of the heat exchanger shroud are a sign of inad- equate air supply, poor venting or some other combustion problem. The cause of this situa- tion must be corrected: contact your installer, service agency or the gas supplier.

WARNING: Accumulation of dust and lint on the heat exchanger fins will reduce air flow and could cause corrosion of the copper heat exchanger. Keep the appliance area clean and free from combustible materials, gasoline and other flammable liquids and vapors. Do not ob- struct the flow of combustion air and ventilation air. If installed near a dryer, make sure the dryer is properly vented, and that the AquaStar vents properly when the dryer is operating.

Fig 5. Characteristic Burner Flame Pattern

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