AquaStar 125B NG Installations- und Betriebsanleitung - Seite 10

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the pilot burner and or the pilot burner orifice may need to

be cleaned, the orifice may need to be replaced, and or

the air screen may need cleaning. The pilot flame should

envelop approximately 10 mm (3/8") of the tip of the

thermocouple. If it is too small, the pilot burner must be

cleaned. To obtain a spark, the position of the Piezo igniter

electrode should be approximately 3 mm (1/8") from the

pilot burner tip.

3mm

Fig. 9 - Characteristic Pilot Flame

To clean the pilot burner and/ or the pilot orifice : Turn

off the gas at the unit. Remove the cover of the heater. To

do so, pull off the temperature adjustment knob and

unscrew and remove the plastic collar 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 off (See Fig 10). The

pilot orifices should also be cleaned or replaced. Do not

enlarge the orifice. 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, on the other hand, are too small to clean and

should be replaced. See #3 in Trouble Shooting Section.

To access the pilot orifice, remove 2 screws holding pilot

assembly in place. Then loosen compression fittings to

expose pilot orifice.

Fig. 10 - Pilot burner with air screen/ pilot orifice

Correct gap between pilot

burner tip and electrode tip

Piezo Electrode

Air screen filter

Thermocouple

Piezo

Electrode

AIR SCREEN

PILOT ORIFICE

Main Burner Flames: The main burner flames should be

blue, with a more intense blue cone in the center core.

Yellow flames could be a sign of wrong size gas orifices or

dirty burners, or a blockage on the heat exchangers fins.

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 venturis. To clean the burners, contact

a gas service person.

Mineral Scale Build-up: AquaStars, when operated at

lower temperature settings, tend not to accumulate mineral

buildup. If however, the heater is used at the higher

temperature settings and the water has a high mineral

content, periodic descaling may be necessary. The heating

coils should be flushed with a descaling solution. Consult

your dealer or Controlled Energy for instructions.

TROUBLE SHOOTING

Introduction

The AquaStar 125 burners are activated by a water flow

valve. Numerous water related problems can cause this

water valve to malfunction such as: Insufficient water flow

volume to activate the burners at its minimum flow

requirement; Dirt in the water flow valve causing it to

malfunction; Sediment build-up in faucet aerators, or

shower heads; Uneven pressures between cold and hot.

(with single lever faucets) Plumbing cross overs. These

water flow related problems can cause the heater to deliver

less than its full output, or to fail to ignite or to shut down

completely.

Problems are stated in upper case, bold face. Most

common causes for the problems follow in order of

likelihood. The suggested solutions require that the cover

be taken off. To do this, remove incandescent particle tray,

pull off the temperature adjustment knob and unscrew and

remove the plastic collar and unscrew the central screw

located at the bottom of the front cover. Pull main cover

out toward you and lift up and out.

PILOT LIGHT WILL NOT LIGHT

1. No gas to the AquaStar

A. Gas cock on gas line may not be open.

B. Gas valve button has not been moved to "PILOT"

position (

). Slide button to right to PILOT.

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 the water heater's gas regulator has not

been reduced. See page 2 for recommended correct gas

pressure. To unjam a regulator, consult your gas supplier.

3. Pilot orifice clogged and/or air screen dirty, or pilot

gas filter is dirty.

Clogging of the pilot burner can be caused by dust and

any suspended matter contained in the ambient air.