Siemens LMV5 Quick Start Manual page 73

Note: Cold Start load step start 0% load, not low fire, Effect> 1
Figure 4-1.13 Example of a Time Based Cold Start Set-up
Parameter
Boiler Setpoint or Setp Add Sensor
ThresholdON (% of current setpoint)
ThresholdOFF (% of current setpoint)
StageSetp_Mod (% of current setpoint)
StageLoad
MaxTmeMod
350
Setpoint = 300 F
300
ThresholdOFF = 80% = 240F
(Cold Start Disengages > 240F
250
200
ThresholdON = 50% = 150 F
(Cold Start Engages < 150 F)
150
100
50
StageLoad = 5%
0
0 10
LMV5 QSG Rev 4
%
n/a 300
50
80
10
5
n/a 10 min
Time Based Stepping Start
MaxTmeMod
= 10 min
20 30
Time (min)
Sec 4 Pg 17
st
load step takes longer.
Value
o
F Current setpoint
Measured temperature
o
150 F must go below ThresholdON
to engage Cold Start.
Cold Start will not disengage
o
240 F
until ThesholdOFF is met.
Defines necessary temperature
o
30 F change required to trigger a load
step. (not used in graph below)
Determines the size of the load
n/a
step.
Determines max time per load step.
40 50
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Notes
TEMP
LOAD
100
90
80
70
60
50
40
30
Release to
Modulate 20
10
0
60 70