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User Guide | MCX-RTU Rooftop
© Danfoss | ADAP-KOOL® | 2018.11
Heating Mode
The Controller is in Heating Mode when the Zone Temperature is below Cool1 Target minus 2x
the Cool Range. Before any heating stages are activated, the fan must be proofed by either a
digital input or analog input to insure the fan is operational.
The first type of heating is Heat Reclaim. The first stage of Heat Reclaim will turn on when the
Zone Temperature is below Heat Reclaim 1 Target minus the Heat Reclaim Range. The first stage
of Heat Reclaim will turn off when the Zone Temperature is above Heat Reclaim 1 Target plus
the Heat Reclaim Range. This occurs for each stage of Heat Reclaim. Each stage has their own
Target, PreDelay and PostDelay. PreDelay is the delay period once the conditions have been met
for the stage to activate. PostDelay is the period the output will stay on once the conditions have
been met for the stage to deactivate. It is required that the previous stage of Heat Reclaim be
ON prior to the next stage activating.
The first type of heating is the Aux Heat. The first stage of Aux Heat will turn on when the Zone
Temperature is below Aux Heat 1 Target minus Aux Heat Range. The first stage of Aux Heat
will turn off when the Zone Temperature is above Aux Heat 1 Target plus Aux Heat Range. This
will occur for each stage of Aux Heat. Each stage has its own Target, PreDelay and PostDelay.
PreDelay is the period the output delays once the conditions have been met for the stage to
activate. PostDelay is the period the output will stay on once the conditions have been met for
the stage to deactivate. It is required that the previous stage of Aux Heat be ON prior to the next
stage activating.
Fan control during Heating Mode depends on the type of fan being controlled. For Single Speed
Fan, the fan will be on whenever there is a demand for heating. If configured for continuous
operation, then the fan will run all the time. For Two Speed Fan, the fan will be on high speed
whenever there is a demand for heating. If the fan is configured for continuous operation, the
fan switches to Low Speed when there is no demand for heating. If the fan is configured for
On Demand, the fan will switch OFF when there is no demand for heating. For Variable Speed
Fan, the fan modulates to maintain the Aux Heat Supply Air Target when there is a demand for
heating. If the fan is configured for continuous operation the fan modulates to the Heat Reclaim/
Aux Heat Min Fan Speed with no demand for heating. If the fan is configured for On Demand,
and there is no demand for heating the fan either modulates to Heat Reclaim/Aux Heat Min Fan
Speed or turns OFF depending on the setting of the Fan Control Demand parameter.
Dehumidification Mode
The Controller is in Dehumidification Mode when the Zone RH or Dewpoint is above Dehumi-
dification 1 Target plus the Dehumidification Range. Before any dehumidification stages are
activated, the fan must be proofed by either a digital input or analog input to insure the fan is
operational.
If all Cooling stages are configured to use Relay Outputs, then the Dehumidification stages turn
on when the Zone Relative Humidity or Zone Dewpoint is above the Dehumidification Target
plus the Range and off at Dehumidification Target minus the Range. Each stage has its own Tar-
get, PreDelay and PostDelay. PreDelay is the delay period once the conditions have been met for
the stage to activate. PostDelay is the period the output stays on once the conditions have been
met for the stage to deactivate.
If any of the Cooling stages are configured to use Analog Outputs, then the Dehumidification
stages use a modulating capacity method. The Dehumidification Mode is enabled when the
Zone RH or Dewpoint is above Dehumidification 1 Target plus the Dehumidification Range.
Once the Dehumidification Mode is enabled the first stage compressor turns on and modulates
to maintain the Compressor 1 Target Pressure. Each stage has its own Target and Range used to
enable that stage of Dehumidification. If the compressor uses an Analog Output, then the com-
pressor modulates to the compressor target pressure. If the compressor uses a Relay Output,
then the compressor is turned ON while the stage is enabled. The Dehumidification PreDelay
and PostDelay is only used to determine when the Dehumidification Stage is enabled. It does
not control the compressors directly.
Fan control during Dehumidification Mode depends on the type of fan being controlled. For
Single Speed Fan, the fans ON whenever there is a demand for dehumidification. If the fan is
configured for continuous operation, the fan will run all the time. For Two Speed Fan, the fans on
high speed whenever there is a demand for dehumidification. If the fan is configured for conti-
nuous operation, the fan switches to Low Speed with no demand for dehumidification. If the fan
is configured for On Demand, the fan switches OFF when there is no demand for dehumidificati-
RS8KE102 | 10
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