Aprilaire 8800 User Manual

SENSOR COMMANDS
TEMP, T
Thermostat room temperature control value COS: C2
Permissions: Read only
Query
Command
Syntax: SN[#] TEMP?<CR>
SN[#] T?<CR>
Description: Requests the room temperature control value setting.
Response or
COS Message
Syntax: SN[#] T=[value][scale]<CR>
Example: SN1 T=72F<CR>
Node address 1 responds with a temperature of 72F.
Parameters Range
value: controlling temperature value [32 – 99F, 0 – 40C]
Fahrenheit [32 – 99]
Celsius [0 – 40]
scale: temperature scale [F, C]
F: Fahrenheit
C: Celsius
The source of the temperature value is dependent on the controller type setting.
Controller Type Source
Thermostat Built-in temperature sensor or, if configured, the average of all support module temperature sensors configured
for controlling temperature.
Humidity Built-in temperature sensor.
If the value of the temperature changes by 1° or more, a C2 COS unsolicited message is issued (if C2 is ON).
HUM
Humidistat humidity control value COS: C2
Permissions: Read only
Query
Command
Syntax: SN[#] HUM?<CR>
Description: Requests the humidity control value setting.
Response or
COS Message
Syntax: SN[#] HUM=[value]%<CR>
Example: SN1 HUM=35%<CR>
Node address 1 responds with a humidity of 35% RH.
Parameters Range
value: controlling humidity value in %RH [--, 0 – 99]
The source of the humidity value is dependent on the controller type setting.
Controller Type Source
Thermostat None.
Humidity Built-in humidity sensor or, if configured, the average of all support module humidity sensors configured for
controlling humidity.
If the value of the humidity changes by 1% RH or more, a C2 COS unsolicited message is issued (if C2 is ON). NOTE: If the control type is set
to thermostat or the humidity sensor has an error, the response is SN[n] HUM=--%<CR>.
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Aprilaire 8800 Specifications

Thermal Specifications

control temperature range	45º to 99ºF (7º to 32ºC)
display temperature range	32º to 99ºF (0º to 40ºC)
accuracy	± 1ºF (± .5ºC)

Operating Environment

storage temperature	-30º to 140ºF (-34.4º to 60ºC)
operating humidity	5% to 90% relative humidity
operating ambient temperature	32º to 120ºF (0º to 48.9ºC)

Electrical Specifications

voltage AC	24 VAC (18-30 VAC)
maximum load per terminal	1 amp
total maximum load	2.5 amp

Screen

screen size	10.3 sq. in.
backlit	constant low intensity light option
font size	large

Weight and Dimensions

height	4 15/16 inches
width	6 inches
depth	1 5/16 inches