Honeywell DHC, Service Manual

Page: 243 / 262

SDC / DHC Hydraulic Components
EN2H-0221GE51 R0812 243
Mixed heating circuit actuator test
Switching sequence STOP, OPEN, STOP, CLOSED,
STOP ...
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 Range
OT –50°C – 40°C
VF 10°C – 90°C
SF 5°C ... 90°C
RT (SDW 10/SDW 30) 0°C ... 40°C
SVLF 5°C – 90°C
SBUS 5°C – 90°C
VF1 (evaluation as NTC 20,
not PT 1000) 5°C – 90°C
VF2 5°C – 90°C
VF3 5°C – 90°C
Confirmation is required for each sensor value. All available
inputs are checked. Unoccupied inputs are marked with "–".
Meaning Display
Value OK 80°C
Value outside the sensible
range IRR
Short-circuit/Interruption Error, –
Function programmed,
but no sensor at input Error, –
No function programmed,
but a sensor is at input Error
Mixer motor:
Function