Outside Temperature Disable; Climate Zone; Design Temperature - Honeywell SDC Service Manual

Control Functions
6.8.4
Function
6.8.5
Function
See also
6.8.6
122

Outside temperature disable

The purpose of outside temperature disable is to prevent the heat
generator from starting up above a defined outside temperature.
If several heat generators are controlled though one device
(automatic stoker, 2-stage), all stages of the device will be
disabled with outside temperature disable.
In the case of cascaded systems with multiple devices, the entry
of an outside temperature disable is possible for each central
device so that individual levels can be blocked by the outside
temperature disable.

Climate zone

The climate zone is the coldest outside temperature value to be
expected.
For the heat demand coverage, this value is taken as the basis for
the design of the heating system.
This parameter defines the corresponding slope value of the
heating curve of the heating circuit with regard to the climate
zone.
5.2.3 "System Parameters" menu, Pg. 71

Design temperature

Until now, configuration of the heating curve calculation occurred
via the values
• Climate zone (T
• Slope (S)
• Heating system (m value)
Supplemental to the slope, the setting of the design temperature
T is also possible directly at the controller.
VLNorm
Setting range DESIGN TEMP: Setting range HC
There is a direct relation between the HEATING CURVE and
DESIGN TEMP parameters in the following connection:
= ° −
T ( 20 C T
VLNorm ANorm
This means that the value of the respective other parameter
changes accordingly.
)
ANorm
+ °
* ) S 20 C
SDC / DHC
to HC (°C)
min max
EN2H-0221GE51 R0812