CHAMPION USN72 User Manual
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Part 5: BASIC SERVICE
5.3.12 Steam Booster Service
(Cont.)
Annual Heater Tube Cleaning
Parts Required:
P/N 112357, Gasket (Return header)
P/N 112356, Gasket (Flow header)
Special Tools Required:
Torque wrench (30 ft/lbs needed)
To clean the heater tubes: Turn off all
power, steam, and water supplies to the
booster and dishwasher.
Refer to Fig. 6.16, Part 6, Replacement
Parts. Note thermostats (item- 10).
Remove the thermostat covers, mark and
disconnect the wires. Remove the conduit
and fittings. Mark the location of each thermostat before removal, then unscrew each thermostat
from its piping. Break the unions (item 12) and remove the piping assemblies from the booster
header. Remove the eight (8) bolts from each header. Remove the flow and return headers.
Inspect the exposed copper tubes and clean as necessary using the cleaning brush
(Champion P/N 112806). Clean the headers as required.
Install new header gaskets and reassemble in reverse order.
To torque the header bolts:
Refer to the torque sequence diagram to the right.
Torque each bolt in three steps:
1) handtight
2) 20 ft/lb
3) 30 ft/lb
Retorque each bolt to 30 ft/lb after 24 hours.
8 BOLTS
8
1
5
3
7
2
6
4
Bolts = 3/8-16
SA-449
Type 1
Flow header gasket
P/N 112356
Return header gasket
P/N 112357
Steam Booster