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Aprilaire 8800 - Page 43

Aprilaire 8800
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SP++, SP--
Increment or decrement the active controlling setpoint COS: N/A
Permissions: Write only
Assignment
Command
Syntax: SN[#] SP++=[value]<CR>
Syntax: SN[#] SP--=[value]<CR>
Description: Increments or decrements the active controlling setpoint by [value].
Examples: SN1 SP++=1<CR>
SN1 SP--=5<CR>
Response Syntax: SN[#] S[sp]++=[value][scale]<CR>
Syntax: SN[#] S[sp]--=[value][scale]<CR>
Example: SN1 SH++=5F<CR>
Node address 1 responds with incrementing the heat setpoint by 5°F.
SN1 SC--=2C<CR>
Node address 1 responds with decrementing the cool setpoint by 2°C.
SN1 SHUM++=5%<CR>
Node address 1 responds with incrementing the humidification setpoint by 5% RH.
SN1 SDEH--=5%<CR>
Node address 1 responds with decrementing the dehumidification setpoint by 5% RH.
Parameters Range
value: controlling setpoint change value
scale: scale [F, C, %]
F: Fahrenheit
C: Celsius
%: percent RH
sp: controlling mode [H, C, HUM, DEH]
H: heat
C: cool
HUM: humidification
DEH: dehumidification
The active controlling setpoint corresponds to the active setpoint to which the control is controlling the equipment.
When the system mode is set to AUTO, the controlling mode is determined by the control. In addition, when the control system mode is set
to AUTO, the heat and cool setpoints or humidification and dehumidification setpoints are interdependent and must abide by the 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 an assignment command is received while the thermostat is running the program schedule, the thermostat automatically initiates a
temporary hold with an end time of the start time of the next scheduled event. If a hold is active at the time of the assignment command,
the hold setpoint is modified. In addition, if a hold is initiated as a result of the receipt of this command, a C17 COS unsolicited message is
issued (if C17 is ON).
If an assignment command is received and the thermostat program format is programmable (i.e. not non-programmable), and the system
mode is set to OFF, this command is ignored.
If the resultant setpoint is outside the allowable range for the setpoint temperature, the command is ignored.
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