Bosch GWH 1600 P LP Specifications download pdf (Page 18)

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Maintenance and service

5.3 Pilot

Inspecting pilot

The pilot should burn with a clean sharp blue flame. The

flame should fully engulf the tip of the thermocouple. If

it does not, clean the pilot assembly using the

procedure below.

Cleaning pilot assembly

• 1. Shut off gas to heater using installer supplied

manual gas shutoff, then remove front cover.

• 2. Carefully loosen 8 mm pilot tube nut shown below.

Once loosened with wrench, continue by hand. Do

not pull pilot tube down. Follow next step.

• 3. Remove both pilot bracket screws that mount to

front of burners.

Fig. 24 Pilot assembly

• 4. Lift up pilot bracket slowly (8 mm nut may need to

be loosened further)

• 5. The pilot orifice sits on top of the pilot tube.

Stamped on it will be a number identifying the gas

type. [5 - Natural Gas] [49 - LP].

• 6. We recommend that you replace if dirty or clogged

(especially LP). If cleaning, compressed air or

aerosol sprayed carburetor cleaner will work. Soak in

cleaner if necessary..

• 7. Blow through pilot burner that is affixed to the pilot

bracket. If air screen on right side of pilot bracket is

dirty or clogged, remove and clean.

• 8. Place new or cleaned pilot orifice back on top of

pilot tube.

• 9. Set pilot bracket on top of the pilot tube.

• 10. Begin to hand thread the 8 mm nut to the pilot

bracket being sure not to cross thread. Once started

tighten pilot bracket to front of burners with both

screws.

• 11. Carefully tighten 8 mm nut with wrench.

• 12. Turn on gas and check for a leak at the 8 mm nut

connection by applying soap solution, then pushing

in pilot button. Bubbles are a sign of a leak.

• 13. If no leaks are found replace front cover and

return heater to service.

5.4 Main burners

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, dirty burners

or a blockage on the heat exchangers fins. If some

burners have yellow flames while others have blue

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.

5.5 Vent assembly

Inspect the draft hood and heat exchanger fins for signs

of soot build-up or any other foreign material such as

spider webs. Clean out any debris found in the vent

hood. Signs of soot indicate insufficient combustion air

or exhaust draft. Check for vent assembly blockage or

combustion air blockage on the underside of the unit.

5.6 Mineral scale build-up

The GWH 1600 PS, when operated at lower

temperatures settings, does not accumulate mineral

build-up. 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 heat

exchanger should be flushed with a descaling solution.

5.6.1 Descaling heat exchanger

1. Shut off the water supply to the water heater using

(installer supplied) shutoff valves.

2. Open hot water taps to drain and relieve pressure

from the plumbing system

3. Drain water from the unit's heat exchanger by

disconnecting inlet and outlet water connections

4. Connect the line (A) from the outlet of the circulating

pump (installer supplied) to the inlet water fitting on the

water heater

5. Using another line (B), connect to the water outlet

fitting on the water heater. Route the other end of this

line into a descaling reservoir

Caution: Pilot orifice may fall out when

pilot tube and pilot bracket are

separated.

Caution: Do not ream or poke orifice as

it will enlarge orifice opening.

bracket screw

orifice

8mm nut

pilot filter

thermocouple

Piezo electrode

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Bosch GWH 1600 P LP Specifications Page 18

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