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Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Fixed High Limit test procedure:
1. Use the emission test switch on each boiler section
to generate call for heat.
2. As described in the table on page 190, adjust item #4
“Max.
boiler water temperature” under menu 6 of each
burner control (GC310) to a max. setting of 243°F
(117°C), as an example, higher than fixed high limit
temperature setting [factory default setting is 203°F
(95°C)].
For testing of the adjustable limit ‘Max. boiler
temperature’ for a reduced temp. value as required
[e.g. 122°F (50°C)].
3. Press/activate emission test switch of the applicable
boiler section, the burner will start.
4. Gradually and slowly throttle the water flow to the
boiler.
5. Observe temperature on the relative GW6C service
display.
6. Once the temperature reached the fixed high limit
setting, burner control will have a hard lock out with
F F1 fault displayed. Burner fan stays on for 10 min.
The fault can only be manually reset once the water
temperature in the boiler drops.
7. Reset to original settings as needed (item #4 under
submenu
6).
General Service Information
Safety Instructions
(continued)
Menu item “6“ is used to change the following operating parameters:
(see page 190 for more detail)
Sub-menu
Item
Parameter
Units/Scale
Factory set
condition
1
Maximum operational input
% of rated input
100%
2
Gas type
0=NG (natural gas)
1=LPG (liquid propane gas)
0
3
Not assigned
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4
Maximum boiler water temperature
from 41°F to 260°F (5°C to 127°C)
203°F (95°C)
5
Integral threshold value of controller
In Kmin from 1 to 255
30 Kmin
6
Runtime optimization
0=minimum pause
1=integral method
1
0
Reset all operating parameters to their
factory set condition.
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Note:
Each boiler section is equipped with its own fixed
high limit. Each fixed high limit must be tested
individually.
Refer to Vitocrossal 300 CA3 Operating
Instructions.
