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REMOVING AND CLEANING
BURNERS
C. Cleaning burners
1. Use a soft wire brush across burner fins to loosen any
debris and then vacuum out.
2. Check to see that the 18 br ass gas injectors in the
rear of t he burner assembly are clean. To access,
remove 8 Philips head screws to the left and right of
the two cent er brass Philips head screws at the rear
of the burner. The burners should separate into two
halves exposing injector s. Blow clean with com-
pressed 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 instruc-
tions in reverse to reconnect bur ner halves.
D. Reinstalling 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 wit h the four
screws. The brass screws attach t o frame.
E. Reinstalling pilot assembly and tube
Models 1000P, 1600P, 260PN, 425PN:
1. Reinsert thermocouple and snap into place. Thermo-
couple tip should sit 1/4" above the burner bed.
2. Put spark electrode into place and attach with clip.
FIGURE 5
Burner fins
Burners disassembled
©BBT NORTH AMERICA CORPORATION
Bosch Group
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 pi-
lot orifice.
Models 1600H, 425HN:
1. Slide pilot air screen over pilot tube.
2. Slide pilot assembly into place. Reinsert pilot shield
and secure with screws t o the burner assembly.
F. Returning heater to service
Models 1000P, 1600P, 260PN, 425PN:
1. Turn on gas and light pilot. Test for possible gas leaks
where burners connect to the gas valve.
Models 1600H, 425HN:
1. Turn on gas and check for leaks where the burners con-
nect to gas valve by applying leak detecting solution as
you initiate water flow to activ ate 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.
Gas injectors
340 Mad River Park, Waitsfield, VT 05673
Burner venturi passage
Bosch Water Heating
CT-13
page 2 of 2
rev 10/06
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