Screenlok ® Flame Arrestor Cleaning - Bradford White MI30T*F(BN,CX,SX) Service Manual

National Excelsior Company
www.excelsiorhvac.com
The Bradford White
DEFENDER
Safety System
ScreenLok ® Flame Arrestor Cleaning
Step 1. Rotate knob of combination thermostat gas valve to the off position.
For Honeywell Control, rotate
knob counter-clockwise to the
"OFF" position.
Step 2. Remove outer jacket door.
Step 3. Remove inner door per SERVICE PROCEDURE RG-I, step 3a through 3e.
Step 4. Disconnect main burner feed line, pilot tube and thermocouple/thermopile
from combination thermostat gas valve and remove burner assembly
from combustion chamber.
NOTE: Feedline nut for natural gas control uses right hand threads,
Step 5. Clean ScreenLok
other debris accumulation. Using a soft brush, clear jacket openings of any dirt, dust, restrictions or other obstructions.
Step 6. Remove any debris from burner assembly per SERVICE PROCEDURE RG-V and reinstall burner assembly
into combustion chamber.
Step 7. Reconnect feedline, thermocouple and pilot tube to the combination thermostat/gas valve.
Step 8 Reinstall inner door per SERVICE PROCEDURE RG-I, steps 4 through 13.
Step 9. To resume operation follow the instructions located on the lighting instruction label or the lighting instruction
located in the installation and operation manual.
36 36
®
LP control uses left hand thread.
® Flame Arrestor using stiff brush, compressed air and/or shop vacuum to remove any scale or
Subject to change without notice.
SERVICE PROCEDURE RG-IX
ScreenLok Flame Arrestor Cleaning
®
For White Rodgers Control,
depress knob slightly and rotate
clockwise to the "OFF" position.
For Robertshaw Control, rotate
knob clockwise to the "OFF"
position.
36
Feedline
Nut