Bosch 520HN Referenzhandbuch

Technical Service Bulletin:

Removing & Cleaning The Burners

Models: 520HN, 520PN, 330PN

LP & NG are extremely flammable. Take extra

precautions when performing any work to the heater.

WARNING

Removing pilot assembly

Models: 520PN, 330PN (Fig. 1):

1. Shut off gas and water to heater, then remove front cover.

2. Remove wire clip holding top of pilot tube into bracket.

3. Move lower end of pilot tube to left to release from black clip

on gas valve. Be sure to catch air screen attached to base of

pilot tube.

4. Pull upwards on upper end of pilot tube to release from bracket.

5. Remove black clip from bracket to release spark electrode.

6. Gently press down on top of thermocouple to release it from

bracket.

Figure 1

Pilot air screen

Pilot wire clip

Burners

Pilot tube

Thermocouple

lead

Models: 520HN (Fig. 2):

1. Shut off gas and water to heater, then remove front cover.

2. Remove both pilot bracket screws and pilot shield from front of

burners.

3. Remove pilot assembly from burner bracket. Be sure to catch air

screen secured to base of pilot assembly.

Figure 2

Pilot shield

Pilot bracket

screws

Burners

Pilot air

screen

Pilot air

screen

Burner set

screws

Removing the burners

1. Remove 2 burner set screws on the right side of the gas valve.

(Fig. 2)

2. Remove four screws from both right and left burner brackets

and set aside. (Fig. 3)

3. Push entire burner assembly up to seperate from the gas valve.

4. Tilt right side of burners up and slide them out at an angle to the

left. (Fig. 4)

Figure 3

12 | Removing & Cleaning The Burners Technical Service Bulletin

Data subject to change without notice | Printed in the USA | BTC 746002313 A | 07.2010 Bosch Thermotechnology Corp.

Bosch Thermotechnology Corp.

50 Wentworth Avenue

Londonderry, NH 03053

Tel: 1-866-642-3198

Fax: 1-603-584-1687

www.boschpro.com

Figure 4

Cleaning the burners (Fig. 5)

1. Use a soft wire brush across burner ns to loosen any debris

and then vacuum out.

2. Check to see that the 18 brass gas injectors in the rear of the

burner assembly are clean. To access, remove 8 Philips head

screws to the left and right of the two center brass Philips head

screws at the rear of the burner. The burners should separate

into two halves exposing injectors. Blow clean with compressed

air or carburetor cleaner and wipe dry with cloth. Do NOT poke

injectors or at tempt to clean with drill bits, wires or other

objects. Clean rear venturi passages with a pipe cleaner and

soapy water. Rinse clean and let dry before reinstalling. Follow

instructions in reverse to reconnect burner halves.

Burners disassembled

Burner fins

Burner

venturi

passage

Gas injectors

ble

urne

ins

urne

entur

p g

injector

Figure 5

Reinstalling the burners

1. Reinstall burners into burner area.

2. Reinstall set screws on right side of gas valve and tighten.

3. Reinstall right and left burner brackets with the four screws. The

brass screws attach to frame.

Reinstalling pilot assembly

Models: 520PN, 330PN (Fig. 1):

1. Reinsert thermocouple and snap into place. Thermocouple tip

should sit 1/4” above the burner bed.

2. Put spark electrode into place and attach with clip.

3. Slide upper end of pilot tube into bracket on burner assembly

and reinsert pin.

4. Slide base of pilot tube to the right into clip. Ensure pilot air screen

is installed between pilot tube and pilot orice.

Models: 520HN (Fig. 2):

1. Slide pilot air screen over pilot tube.

2. Slide pilot assembly into place. Reinsert pilot shield and secure

with screws to the burner assembly.

Returning heater to service

Models 520PN. 330PN:

1. Turn on gas and light pilot. Test for possible gas leaks where

burners connect to the gas valve.

Models 520HN:

1. Turn on gas and check for leaks where the burners connect to

gas valve by applying leak detecting solution as you initiate

water ow to activate the heater. Allow enough time to bleed all

air in gas line. Bubbles are a sign of a leak.

All models:

2. If there are bubbles at either connection immediately shut off

water and gas. Loosen the burner set screws on the right side of

gas valve. Remove the burners and inspect the o-ring. Replace if

damaged. Reseat burners and tighten set screws. Check again

for leaks.

3. Replace front cover when complete.

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