Aprilaire 8870, System Installation Manual

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COMMAND DESCRIPTION VALUE
Communication Control Commands
CR Command Response Control Silent / Quiet / Normal
C1 Change of State (COS) – HVAC relays ON/OFF
C2 COS – Temperature ON/OFF
C3 COS – Remote Temperature ON/OFF
C5 COS – Set Points ON/OFF
C6 COS – Network Override ON/OFF
C7 COS – Mode ON/OFF
C8 COS – Fan ON/OFF
HOLD User Hold Status ON / OFF
NAME Location Name <String>
ID Report Model No. and software rev. Read Only
Thermostat Sensing Commands
SCALE Command Temperature Scale F / C (Fahrenheit/Celsius)
TEMP, T Report Thermostat Room Temperature Read Only
HUM Report Thermostat Room Humidity Read Only
(requires humidity control sensor)
RSM Identify all external sensors connected Read Only
to a thermostat’s local communication network
RxSy Report value of any sensor on thermostat’s Read Only
(x = 1-4; y = 1,2) local communication network
OT Report Thermostat Remote “Outdoor” Temperature Read Only
R Report Thermostat Remote “Outdoor” Temperature Read Only
OH Report Thermostat Remote Humidity Read Only
Thermostat HVAC Operational Commands
SH Heat Mode Set Point Two or three digit integer: 40 – 88 for °F; 4 – 31 for °C
SH++ Increment heat set point Integer value which when added to the current heat
set point does not fall outside the SH limits
SH-- Decrement heat set point Integer value which when deducted from the current
heat set point does not fall outside the SH limits
SC Cool Mode Set Point Two or three digit integer: 42 – 90 for °F; 6 – 33 for °C
SC++ Increment cool setpoint Integer value which when added to the current cool
set point does not fall outside the SC limits
SC-- Decrement cool setpoint Integer value which when deducted from the current
cool set point does not fall outside the SC limits
S Current Mode Set Point Two or three digit integer (see next two commands)
SP++ Increment current mode set point Integer value which when added to the current mode
set point does not fall outside the SH and SC limits
SP-- Decrement active setpoint Integer value which when deducted from the current mode
set point does not fall outside the SH and SC limits
MODE, M Thermostat Mode of Operation A /C /H /E/OFF (Auto/Cool/Heat /EMHT/Off)Humid/Dehum
when operating as a humidity controller
FAN, F Fan Switch Setting A /ON (Auto /On)
HVAC, H Report HVAC Relay States Read Only
Auxiliary Information Commands
EQUIPCONFIG Reports the setting of the thermostat Read Only
configuration dip switches
BLTON Turns on backlighting for 10 seconds. No Value Required for this Command
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MODEL 8870 BASIC COMMAND SET