Aprilaire 8800 User Manual

STATUS COMMANDS
HVAC, H
Relay output status COS: C1
Permissions: Read only
Query
Command
Syntax: SN[#] HVAC?<CR>
SN[#] H?<CR>
Description: Requests the current state of the relay outputs.
Response or
COS Message
Syntax: SN[#] HVAC=G[x]Y1[x]W1[x]Y2[x]W2[x]B[x]O[x]<CR>
Example: SN1 HVAC=G-Y1-W1+Y2-W2+B+O-<CR>
Node address 1 responds with outputs W1, W2 and B, ON and G, Y1, Y2 and O, OFF.
Parameters Range
value: relay output status [-, +]
-: relay status is OFF
+: relay status is ON
If any relay status changes, a C1 COS unsolicited message is issued (if C1 is ON).
RECOVSTAT
Progressive recovery status COS: C15
Permissions: Read only
Query
Command
Syntax: SN[#] RECOVSTAT?<CR>
Description: Requests the current state of progressive recovery.
Response or
COS Message
Syntax: SN[#] RECOVSTAT=[value]<CR>
Example: SN1 RECOVSTAT=OFF<CR>
Node address 1 responds with a progressive recovery status of OFF.
Parameters Range
value: progressive recovery status [OFF, ON]
OFF: progressive recovery is inactive
ON: progressive recovery is active
This command is ignored if the controller type is set to humidistat.
If the progressive recovery status changes, a C15 COS unsolicited message is issued (if C15 is ON).
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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