LAARS U.H.E. - Service Manual - Manual (Page 23)

U.H.E Service Manual Page 23
Burner Tube Inspection
Step 1. Inspect burner tube as follows (BSI ceramic fiber mesh burner, water heaters prior to
serial number “CK”) :
a) Visually inspect ceramic fiber mesh, mesh should be uniform in appearance without large
gaps, tears or fraying. Mesh should have uniform pattern allowing for unrestricted gas
flow.
b) Gently squeeze burner tube, Burner tube should feel firm without any soft areas
around the sides or at the bottom.
c) Visually inspect inside burner tube, Burner tube should be intact with no areas of
deterioration. Ports should be free of any debris.
Inspect burner tube as follows (Acotech metal fiber mesh burner, water heaters with
“CK” serial number or later).
a) Outer fiber mesh should be uniform with no tears or deterioration.
Step 2. If burner tube is affected by any of the above, replacement is required. Refer to burner
tube replacement procedure below.
Burner Tube Replacement Procedure
Note: New metal fiber mesh burner (Acotech) is the replacement burner for the BSI ceramic fiber sock burner. The length
of burner will not be the same as the previous BSI burner. Provide the model and serial number for the correct replacement
burner.
Step 1.
Fully inspect burner flange gaskets, igniter and flame sensor gaskets for the following:
a) Tears d) Dirt or debris
b) Missing material e) Other imperfections that would inhibit proper seal
c) Cracks
If gaskets are NOT affected by any of the above, gasket replacement is not required.
Step 2. Install burner tube with gaskets into burner mounting insert. Be sure gasket surfaces are free
of debris.
Step 3. Reconnect the blower/gas valve/transition assembly to burner mounting insert. Secure using
nuts from step 8 on previous page.
Step 4. Carefully reinstall flame sensor with gasket and hot surface igniter with gasket and secure with
screws from step 7 on previous page. Reconnect wire harnesses to sensor and igniter.
Step 5. Reconnect wire harnesses to blower motor and to gas valve.
Step 6. Reconnect PVC venting, gas supply and silicone tubing to gas valve. Turn on gas to heater
and check for gas leaks, repair any gas leaks found.
Step 7. Restore 120 volt power supply to water heater and confirm proper operation following the
lighting instructions on the lighting instruction label or the lighting instruction located in the
installation and operating instruction manual.
Step 8. Replace surround cover on top of water heater.
WARNING
Heater components may be HOT when performing the following steps in this procedure.
Take necessary precaution to prevent personal injury.
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