2 Expansion Options
04.09.2016 Mk8 MM Expansion Features Installation and Set-Up Guide Page 13
Exp
Option
Default Range Description
33 - Unused
34 - Unused
35 - Unused
36 - Unused
37 - Unused
38 - Unused
39 - Unused
40 0 Top Blowdown Function
To enable top blowdown, the top blowdown expansion feature must be
unlocked. The TDS value in the water, measured by the TDS probe on
terminals 3P+, 3P-, 3T+ and 3T-, is maintained by a PID loop, see
expansion options 52, 53 and 54. For setting 1, the terminal TB output will
open and close an external solenoid valve. For setting 2, the top blowdown
valve is open and closed via a top blowdown servomotor on terminals P-,
FW, P+, TBI and TBD. For setting 3, continuous top blowdown management
is enabled for the top blowdown.
0 Top blowdown disabled
1 Top blowdown using solenoid
2 Top blowdown using servo (2-state)
3 Top blowdown using servo (continuous)
41 0 TDS Units
The TDS units can be displayed in ppm or μS/cm.
0 Concentration in ppm
1 Conductivity in μS/cm
42 2500 TDS Target
This is the set TDS target value which the TDS control will try to maintain by
open and closing the solenoid or top blowdown valve, see expansion
option 40. The target TDS value should be set according to the boiler
manufacturer’s guidelines.
50 – 9999 ppm or μS/cm (see expansion option 41)
43 180 TDS Temperature Compensation
The steam temperature is calculated from the steam pressure sensor
reading. The TDS value read will be corrected by the % per
O
C set, for the
difference between the steam temperature and 25 degrees
O
C, so the TDS
measured value displayed is shown corrected to 25 degrees
O
C. This
temperature compensation coefficient will depend on the contaminants in
the water and should be set accurately for the contaminants that make up
the TDS in the water.
20 – 1000 0.20 – 10.00% per
O
C
44 65 TDS PPM Conversion
The ppm to μS/cm conversion coefficient will depend on the contaminants
in the water and should be set accurately for the contaminants that make up
the TDS in the water.
20 – 100 0.20 – 1.00ppm / ( μS/cm)
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