Honeywell SDC heating and district heating controller Service Manual page 38

Operation
Information
Return
temperature
Flow sensor of
district heating
valve VF1
Return sensor of
district heating
valve VFB
External heat
generator disable
Flue gas
temperature
Water heater
temperature (1)
Water heater
temperature (2)
Water heater
temperature
controller
Demand via
switching contact
(VI1)
Demand via
switching contact
(VI2)
Demand via
switching contact
(VI3)
Mixed heating
circuit 1 flow
temperature
Mixed heating
circuit 1 return
temperature
38
Display Condition
Setpoint/Actual Return sensor
value connected and one of
the functions for return
increase is active
Setpoint/Actual
value
Setpoint/Actual
value
Disabled mode External heat generator
ON/OFF disable (VI1-VI3)
specified
Limit signal Variable input
value/Actual configured as AGF
value
Setpoint/Actual If hot-water circuit is
value present
Setpoint/Actual Variable input
value configured as SF2
Load condition Thermostat mode
ON/OFF
Demand VI configured as
ON/OFF demand contact
Demand VI configured as
ON/OFF demand contact
Demand VI configured as
ON/OFF demand contact
Setpoint/Actual Mixed heating circuit 1
value specified
Actual value Return temperature with
return maximum limit
Remarks
Connection of return sensor
to associated variable input
1 or 2, VI can no longer be
called up
With district heating
controllers
With district heating
controllers
External contact to variable
input VI1, VI2 or VI3
Connection only to variable
input VI1
Code 1 only appears if SF2
is present
Connection to variable input
VI1, VI2 or VI3
Thermostat instead of sensor
(SF1 only)
External contact to variable
input VI1, VI2 or VI3
External contact to variable
input VI1, VI2 or VI3
External contact to variable
input VI1, VI2 or VI3
EN2H-0221GE51 R0808
SDC / DHC