LAARS U.H.E. - Service Manual - Manual (Page 22)

LAARS Heating Systems Page 22
Step 1. Position main power switch to “OFF”.
Step 2. Disconnect (unplug) water heater from
120 volt power source.
Step 3. Turn off gas supply to water heater.
Step 4. Un-latch & remove surround cover from top of
heater.
Step 5. From the gas valve, disconnect
the gas connection, PVC venting,
wire harness and silicone tubing.
Step 6. Disconnect wire harness from
blower assembly.
Step 7. Remove the two screws holding
each the hot surface igniter and
flame sensor in place (long reach
magnetic Phillips screw driver).
Carefully remove hot surface igniter
and flame sensor from combustion
assembly.
Step 8. Remove the 4 nuts (7/16" wrench) holding
the burner transition in place. Lift the blower/gas
valve transition assembly from burner mounting
insert, remove gasket and set aside.
Step 9. Remove burner tube from burner
mounting insert. See next page for
burner tube inspection procedure.
Burner Tube Removal Procedure
WARNING
120 volt potential exposure. Isolate the
appliance and reconfirm power is
disconnected using a multi-meter.
WARNING
Heater components may be HOT when performing the following steps in this procedure.
Take necessary precaution to prevent personal injury.
22
BURNER TRANSITION
MOUNTING NUTS
HOT SURFACE
IGNITER/SPARK
ROD