Aprilaire 8800 - Page 45

SDEH
Controlling dehumidification setpoint COS: C5
Permissions: Read/Write
Query
Command
Syntax: SN[#] SDEH?<CR>
Description: Requests the controlling dehumidification setpoint.
Assignment
Command
Syntax: SN[#] SDEH=[value]<CR>
Description: Sets the controlling dehumidification setpoint to [value].
Example: SN1 SDEH=55<CR>
Response or
COS Message
Syntax: SN[#] SDEH=[value]%<CR>
Example: SN1 SDEH=55%<CR>
Node address 1 responds with a controlling dehumidification setpoint of 55%.
Parameters Range
value: humidistat setpoint in %RH [10 – 90]
The controlling dehumidification setpoint corresponds to the active setpoint to which the humidistat is controlling the dehumidification
equipment. Assignment commands are ignored if the controller type is set to thermostat.
When the humidistat system mode is set to AUTO, the controlling mode is determined by the humidistat. In addition, when the humidistat
system mode is set to AUTO, the Humidification and Dehumidification setpoints are interdependent and must abide by the fixed deadband. If
an assignment command is received with a setpoint value that causes a deadband violation, the opposite setpoint is automatically increased
or decreased to fulfill the deadband requirement. If the deadband requirement cannot be fulfilled by increasing or decreasing the opposite
setpoint, the command is ignored and no response sent.
Integer values must be within the range specified. The dehumidification setpoint can be changed through the Home Screens for humidistat
control. If the dehumidification setpoint is changed at the thermostat, a C5 COS unsolicited message is issued (if C5 is ON).
SDEH++, SDEH--
Increment or decrement the controlling humidistat dehumidification setpoint COS: N/A
Permissions: Write only
Assignment
Command
Syntax: SN[#] SDEH++=[value]%<CR>
Syntax: SN[#] SDEH--=[value]%<CR>
Description: Increments or decrements the controlling dehumidification setpoint to [value].
Examples: SN1 SDEH++=3%<CR>
SN1 SDEH--=5%<CR>
Response Syntax: SN[#] SDEH++=[value]%<CR>
Syntax: SN[#] SDEH--=[value]%<CR>
Example: SN1 SDEH++=5%<CR>
Node address 1 responds with incrementing the dehumidification setpoint by 5% RH.
Parameters Range
value: controlling dehumidification setpoint increment or decrement value
The controlling dehumidification setpoint corresponds to the active setpoint to which the humidistat is controlling the dehumidification
equipment. This command is ignored if the controller type is set to thermostat.
When the humidistat system mode is set to AUTO, the controlling mode is determined by the humidistat. In addition, when the humidistat
system mode is set to AUTO, the Humidification and Dehumidification setpoints are interdependent and must abide by the fixed deadband.
If an assignment command is received with a setpoint increment or decrement value that causes a deadband violation, the opposite setpoint
is automatically increased or decreased to fulfill the deadband requirement. If the deadband requirement cannot be fulfilled by increasing or
decreasing the opposite setpoint, the command is ignored and no response sent.
If the resultant setpoint is outside the allowable range for the dehumidification setpoint, the command is ignored.
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