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ACONT900AC43UA
Pub. No. 11-HD04D1-2
5
69-2080—05
2.
Securely tighten each terminal screw.
3.
Push excess wire back in the hole.
4.
Plug the hole in the wall with nonflammable insula-
tion to help prevent drafts from adversely affecting
Comfort Control operation.
Mounting Comfort Control on Sub-base
NOTE: To remove the Comfort Control from the wall,
pull straight out.
1.
Align the terminal screw block with the pins on the
back of the Comfort Control.
2.
Push the Comfort Control straight onto the wall-
plate. See Figure 4.
3.
Perform installation of all other system equipment.
Fig. 4. Comfort Control
4.
Turn ON power to the heating and cooling
equipment.
INITIAL POWER-UP
Power-Up Sequence
The AccuLink
TM
communicating Comfort Control will
communicate and identify all AccuLink
TM
components in
the system.
Discovery Mode
Discovery mode begins when AccuLink
TM
communicating
Comfort Control is first installed and power is connected.
For communicating equipment, the Comfort Control
automatically configures the equipment type, number of
stages, cycle rates for each stage, and compressor stage
ratios based on the information it received during
Discovery mode.
NOTE: While in Discovery mode, the LED indicator
located in the upper right corner of the Comfort
Control will be illuminated.
NOTE: All discovered values will be saved into memory.
If a communicating device goes missing (Err 89)
or changes in value (Err 126) the error will be
broadcast to the comfort control screen. (Restor-
ing communications will clear this error or see
ISU 0706 to reset the system configuration).
NOTE: The communicating Comfort Control can be
reset (ISU 0710) to factory default settings.
NOTE: If no equipment is connected during the Auto-
Discovery process, the system mode will be
stuck at “OFF” and no equipment will run.
NOTE: To change the default/discovery settings, enter
the Installer Setup menu (see Table 4) and select
the desired item.
NOTE: Only ISU settings with an “E” will be Auto-
Discovered. Manually changing an ISU setting to
an option other than “E” disables Discovery
mode for that ISU setting.
NOTE: See Table 3 for default cycle rate settings.
Table 2. Terminal Designations
Terminal
Designations
Function
D
Data
R
Power - 24 Vac (hot)
B
Power - 24 Vac (Common)
WALL
Table 3. Typical Cycle Rate Settings
System
Cycles Per
Hour
Steam, Gravity
1
Hydronic Heat, Condensing Gas
Furnaces, Compressor Stages
3
Gas or Oil Forced Air, Auxiliary Heat
5
Electric Heat, Emergency Heat
9