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Heatronic 40007738003455 (2014/04) 5 of 60
Maximum Modulation -----------------------------------------------
The Maximum Modulation is the highest signal the control
can send to modulate the boiler. For boilers with electronic
operators, the boiler’s input signal range may not match the
output signal range of the Heatronic 4000. Use the MAX MOD
setting in the Source (#) Menu to select an appropriate boiler
maximum modulation.
For 0 to 10 V (dc):
Maximum Modulation =
Boiler’s Maximum Input Signal
x 100%
10 V (dc)
For 4 to 20 mA:
Maximum Modulation =
Boiler’s Maximum Input Signal - 4mA
x 100%
16 mA
Example:
A boiler’s input signal range is 0 to 9 V (dc). The Heatronic
4000 control has an output signal range of 0 to 10 V (dc).
Maximum Modulation = 9 V x 100% = 90%
10 V
Control’s
Output
Signal
Range
Boiler’s
Input
Signal
Range
100%
10 V (dc)
9 V (dc)
0 V (dc)0 V (dc)
90%
Boiler’s
Maximum
Input
Signal
Maximum
Modulation
0%
EMS Signal Minimum
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
The EMS Signal Minimum is applicable for EMS temperature
type boilers that operate based on a 0-10 Vdc analog input
signal. This setting is to be set to the appropriate signal that
is defined by the boiler’s ignition control. This analog value
corresponds to the temperature value set with the EMS
Temperature Minimum setting.
EMS Temperature Minimum
----------------------
The EMS Temperature Minimum is applicable for EMS temperature
type boilers that interpret an analog value as a temperature.
This setting is to be set to the appropriate temperature that
is defined by the boiler’s ignition control. For a 0-10 Vdc EMS
boiler, this temperature value corresponds to the value set with
the Vdc Signal Minimum setting. For a 4-20 mA EMS boiler,
this temperature value corresponds to 4 mA.
EMS Temperature Maximum
- - - - - - - - - - - - - - - - - - - - - -
The EMS Temperature Maximum is applicable for EMS
temperature type boilers that interpret an analog value as
a temperature. This setting is to be set to the appropriate
temperature that is defined by the boiler’s ignition control. For
a 0-10 Vdc EMS boiler, this temperature value corresponds
to 10 Vdc. For a 4-20 mA EMS boiler, this temperature value
corresponds to 20 mA.
Maximum Boiler Outlet
- - - -- - - - - -- - - - - - -- - - - - -- - --
The control has the capability for each boiler outlet tempera-
ture to be monitored & limited. The MAX OUT setting sets
the maximum boiler outlet temperature. If the boiler outlet
temperature reaches the boiler outlet maximum, the boiler
is turned off. In order for the boiler to be able to be turned
on again, the boiler outlet temperature must drop 10°F (6°C)
below the boiler outlet maximum.
If MAX OUT is set to OFF, the control only monitors the boiler
outlet temperature.
Boiler Pump Post Purge - - - - - - - - - - - - - - - - - - - - - - - - - - --------------
This setting sets the amount of time the control operates the
boiler pump after the boiler is turned off. This will purge heat out
of the boiler, reducing stand-by losses, & also aid in reducing
“kettling”. The amount of time for the boiler pump post purge
is adjustable between 10 seconds & 20:00 minutes. Auto is
also available in which the control automatically determines
the amount of time based on the boiler mass.
5


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