A-2
Maintenance plan
Check / Maintenance
Interval
Results
Note
Measured
values/
accomplished
repairs
OK
not
OK
During the maintenance, check all screw connections for
tightness (for corresponding torque values see Workshop
Manual).
1. Electrics (connections, components)
a) Examine electrical plug connections and the wiring
harness for visible damages, replace as required.
b) Verify the cables are secured properly with cable ties, if
necessary, retrofit or replace them.
c) Replace high-voltage contactor.
annually
annually
every12
years
2. Heat exchanger
Check for external damage, discoloration caused by over-
heating and leaks.
annually
Determine overhea-
ting cause as needed
(e.g. lack of water);
check overheat pro-
tection
3. Temperature sensors
a) Check temperature switch (water outlet) for function.
b) Check temperature limiter for function.
c) Replace temperature switch.
annually
annually
every 5
years
4. Burner head
a) Inspect hood for damage.
b) Earth conductor check/check grounding resistance
< 50m
Ω
against vehicle frame
c) Check isolation resistance > 50M
Ω
(at 1000V DC test
voltage)
annually
annually
annually
Replace damaged
parts.
5. Warning notes
a) Check warning labels.
Replace if absent or
unrecognizable.
6. Water system
a) If available, inspect water filter insert.
Clean as needed or
replace
7. Functional check
a) Check heater functionality.
b) Check operation of circulating pump for 120s in purge
cycle.
c) Check ground fault interrupter (AC ) or ISO guard (DC) for
function (if necessary acc. to manufacturers instructions).
annually
annually
annually
Check heat buildup
after at least 10 min
heater operation.
Summary of Contents for Thermo AC 070
Page 47: ...memos...
