Checking The High Limit Safety Cut-Out Setting; Filling The Heating System With Water And Venting The System; Filling Siphon With Water - Viessmann Vitocrossal 200 CM2 186 Service Instruction

Vitocrossal 200 CM2 186 to 311 Service
Safety Instructions

Checking the high limit safety cut-out setting

Never set the high limit safety cut-out higher than 210°F
(99°C).
See the control section of the Installation
Instructions.

Filling the heating system with water and venting the system

For water hardness and pH value see page 25.
Note: Observe the water quality requirements on page 25.

Filling siphon with water

1. Undo the siphon cup A and fill with water (otherwise
flue gas may escape).
2. Check that the condensate can drain freely.
3. Refit the siphon cup A.
(continued)
CSD-1 Field Testing of High Limit Switches for Vitocrossal 200
CM2 boilers – where required by law.
As per ASME Boiler and Pressure Vessel Code, section IV,
subsection HG-613 TEMPERATURE CONTROL
requirements, Vitocrossal 200 CM2 hot water boilers are
protected from over-temperature by two temperature-
operated controls. These temperature control devices
conform to Standards for Limit Controls, and are accepted
by CSA, a nationally recognized testing agency.
Each boiler is equipped with a manual reset high
temperature limit control and a temperature control that
will cut off fuel supply when the system water
temperature reaches a preset operating temperature.
VIESSMANN IS NOT RESPONSIBLE FOR ANY DAMAGES
THAT THE FOLLOWING TEST PROCEDURE MAY RESULT
IN BY OVERHEATING THE SYSTEM.
The Vitocrossal 200 boilers are equipped with 2 RTD
temperature sensors that when activated on temperature
rise (high fixed limit of 210°F (99°C) disable the burner
to operate.
The fixed high limit, when tripped, produces a fault that
will require manual reset of the boiler control.
Fixed High Limit test procedure:
Install a jumper switch in GW6B control on terminals
1.
2-3 of 146 plug. (this will simulate a call for heat)-
for multi boiler systems using the GW6B cascade +
lead boiler and lag boiler configuration, use the
emission test switch on GW6B control (top left corner
switch with ladder sign).
2. Set coding address 9B (external heat demand) to max.
of 241°F (116°C), as an example, higher than fixed
high limit temperature setting (if using emission test
switch, skip this step).
3. As described in the table on page 9, adjust item #4 Max.
boiler water temperature" under menu 6 of the 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).
4. Initiate a call for heat with the jumper switch on plug
146 (as in item 1 above) or press/activate emission
test switch if applicable, the burner will start.
5. Gradually and slowly throttle the water flow to the
boiler.
6. Observe temperature on the GW6B control.
7. Once the temperature reached the fixed high limit
setting, burner control will have a hard lock out with
F F2 fault displayed. Burner fan stays on for 10 min.
The fault can only be manually reset once the water
temperature in the boiler drops.
8. Reset to original settings as needed (item #4 under
submenu 6 and external heat demand under address
9B).
General Information
9