Johnson Controls (H, Engineering Manual

Page: 50 / 124

OUTDOOR UNITS
2-28
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RUN indicator lights.
Power to
I.U. PCB: ON
only for Indoor Unit
with Auto-Louver
Auto - louver
0 Reset
COOL Indication
for Unit with Drain Pump
HIGH Indication
LOW Indication
Indication of Set Temp.
MEDIUM
Indication
Start of Communication between
I.U. and O.U.
Start of Communication between
I.U. and Wired Controller
Low
High
Medium
ON
(Lower than
Activation Level)
OFF
(Higher than
Activation Level)
Switch: Increasing Set Temp.
Switch: Decreasing Set Temp.
Airflow
Change Over
Switch
Set
Operation Mode
at “COOL”.
I.U.: Indoor Unit
O.U.: Outdoor Unit
Power to
I.U.: ON
Press
Temp. Switch
Press
FAN Switch
Press
RUN/STOP
Switch
Float Switch
to 1
Cooling
Operation
Higher than
Set Temp.
(Thermo-ON)
Lower than
Set Temp.
(Thermo-OFF)
Outdoor
Temp.
≤ -14°F
(-10°C)
I.U.
Air Intake
Temp.
> -14°F
(-10°C)
MD Operation: ON
No
Yes
3 min.
PID Control for I.U.
Electronic Expansion Valve
Thermo-OFF
MIF Operation at Set Fan Speed