Honeywell SDC Service Manual page 243

SDC / DHC
Mixer motor:
Function
EN2H-0221GE51 R0812
Mixed heating circuit actuator test
Switching sequence
For easier diagnosis by the technician, a test run that detects
implausibilities in the system has been implemented.
The jump occurs via an additional item in the relay test. The test
run is started by pressing the input button. The sensor test
sequence is similar to the final device test.
Value
OT
VF
SF
RT (SDW 10/SDW 30)
SVLF
SBUS
VF1 (evaluation as NTC 20,
not PT 1000)
VF2
VF3
Confirmation is required for each sensor value. All available
inputs are checked. Unoccupied inputs are marked with "–".
Meaning
Value OK
Value outside the sensible
range
Short-circuit/Interruption
Function programmed,
but no sensor at input
No function programmed,
but a sensor is at input
STOP, OPEN, STOP, CLOSED,
STOP ...
Range
–50°C – 40°C
10°C – 90°C
5°C ... 90°C
0°C ... 40°C
5°C – 90°C
5°C – 90°C
5°C – 90°C
5°C – 90°C
5°C – 90°C
Display
80°C
IRR
Error, –
Error, –
Error
Hydraulic Components
243