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Altering Settings
Fixed High Limit
Testing the FHL
CAUTION
A B Test connection is a 120 VAC
circuit!
CAUTION
Boiler and burner must be supervised
during entire procedure. Allow boiler
water temperature to cool down to
140°F / 60°C before activating any
attached heat distribution system.
12
The default setting of the fixed high limit (FHL) is 230°F / 110°C.
1.
Slot screw
The main circuit board is pictured from the top
FHL test connection, A B Test
CAUTION
Connected low temperature (floor
heating) systems, whether connected
with or without mixing valves, must be
deactivated during this procedure.
Attached DHW tanks must be isolated
and proper water expansion to the
expansion tank must be guaranteed
before performing this test.
The FHL deactivates the burner control
circuit if abnormally high temperatures
occur.
If tripped, it may be reset by pushing in
the pin, labelled with a "
ballpoint pen). If a "click" can be
heard, the limit was tripped.
Adjustment to 212°F / 100°C
1. Turn indicator screw at rear of FHL
to 212°F / 100°C position using a
flat-head screwdriver (readjustment
to previous position is not
possible).
2. Please complete Protocol on page
26.
CAUTION
If adjusting the fixed high limit to
212°F / 100°C, do not set adjustable
high limit higher than 167°F / 75°C.
A test can be performed to ensure
proper operation of the FHL:
→ Deactivate power to control.
→ Install a jumper between
terminals A and B
.
→ The adjustable high limit
disabled.
→ Reactivate power to control.
→ The burner is activated until the
boiler water temperature reaches the
FHL temperature and the FHL
deactivates the burner.
After deactivation of the FHL,
→ Deactivate power to control.
→ Remove jumper between
terminals A and B.
→ wait until boiler water temperature
has cooled 27 to 36°F / 15 to 20°C
below the FHL temperature and
reinitiate FHL by pushing in
the
pin.
"
"
→ Reactivate power to control.
" (using a
is
"
"
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