Unigas C85A - Page 84

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11 Cold start thermal shock (CSTP)
If there is a steam boiler or a boiler that must start up cold in the plant and to avoid thermal shocks a slow heating is required for the boiler by maintaining
the burner at the minimum output, the automatic function “Cold start thermal shock” can be performed instead of the manual operation at minimum load.
The CSTP (Cold Start Thermal Schock) function can be enabled by the Technical service only (access by reserved password). if this function is enabled,
when the burner starts up the “Thermal shock protection activated” message will be shown.
If this function is not enabled, after start-up, the burner will rapidly increase the load according to the requested value.
The CSTP function is a Service level paramter, to enable this function proceed as follows:
1st level 2nd level 3rd level 4th level 5th level 6th level Description
Params & Display
Menu level for making the parameter
settings
LoadController Settings for the internal load controller
ColdStart
Settings for the cold start (thermal shock
protection)
ColdStartOn
Deactivated
A
ctivated
The parameter ColdStartOn deactivates
or activates the Cold start protection
function, the other parameters are factory
set and can be changed following the next
programming rows (see diagram)
ThresholdOn 0...100%Wcurren 20%
StageLoad 0..100% 15%
StageSetp_M od 1...100% Wcurrent 5%
Stage- Setp_Stage 1...100% Wcurrent 5%
MaxTme- Mod 1...63 min 3 min
MaxTmeStage 1...63 min 3 min
Cold start thermal shock protection,
maximum time per step (multistage)
ThresholdOff 1...100% Wcurrent 80%
Cold start thermal shock protection
deactivation level referred to the current
set-point (Wcurrent)
A
dditional-Sens
Deactivated
Pt100
Pt1000
Ni1000
Deactivated
Select extra sensor for cold start thermal
shock protection
Temp Cold- Start 0…2000 °C
Display of temperature acquired by extra
sensor for the cold start thermal shock
protection function
Setpoint AddSensor 0...450 °C 60°C
Set-point for extra sensor for cold start
thermal shock protection
Release Stages no release/ release release
Cold start thermal shock protection load
step stage mode (multistage operation)
MaxTmeStage 1...63 min 3 min
Cold start thermal shock protection,
maximum time per step (multistage)
ThresholdOff 1...100% Wcurrent 80%
Cold start thermal shock protection
deactivation level referred to the current
set-point (Wcurrent)
A
dditionalSens
deactivated Pt100
Pt1000 Ni1000
deactivated
Select extra sensor for cold start thermal
shock protection
Temp Cold- Start 0…2000 °C
Display of temperature acquired by extra
sensor for the cold start thermal shock
protection function
Setpoint Add- Sensor 0...450 °C 60 °C
Set-point for extra sensor for cold start
thermal shock protection
Release Stages no release/ release release
Cold start thermal shock protection load
step stage mode (multistage operation)