Operating instructions

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4. AMBIENT SENSOR
The ambient sensor is the outside air temperature sensor
and is used on heat pump units only. This component
allows the heat pump to operate down to 24°F. See Sec.
1G for detailed information on operation.
To check the ambient sensor, first measure outside tem-
perature surround the sensor. This is called "ambient".
Next, unplug the ambient sensor (red plug) from the AC
power module board. Now do an ohms test on the wire side
of the plug.
For the specific ambient (outside) temperature listed below,
you should have the following readings:
At Ambient Temperature You Should Have
of: Ohms Reading of:
55°F 11667
60°F 10212
65°F 8959
70°F 7876
75°F 6939
80°F 6126
85°F 5418
90°F 4802
95°F 4264
100°F 3793
NOTE: Any ohms reading has a tolerance of plus or minus
(±) 10% to be a good component. A very precise and
accurate ohm meter must be used before condemning
the sensor.
5. REMOTE SENSOR
The remote sensor is the temperature sensor that allows the
unit for that zone to cycle "ON" and "OFF" by temperature.
Normally, a remote sensor is used for each unit or zone. A
remote sensor is optional for Zone 1, or a single unit installa-
tion.
3. RELAY, 2-POLE
The relay is used on basement air conditioner Model 39125
and Basement heat pump Model 39335 ONLY. The relay has
five (5) terminals. It is used to complete a circuit to the
furnace.
Terminals 1 and 3 are the coil terminals. When the coil
(terminals 1 and 3) is not energized (no power to terminals 1
and 3), continuity should exist between terminals 4 to 5; and
no continuity between terminals 2 to 4.
When the coil (terminals 1 and 3) is energized (power to ter-
minals 1 and 3), continuity should exist between terminals 2 to
4 and no continuity between terminals 4 to 5. This relay is
used to energize the furnace blower any time the compressor
is energized. This circuit has been added to enhance both the
cooling and heating operation.
NOTE: This circuit will not work with all furnaces. Before
sing this circuit, check with the furnace manufacturer for proper
wire connection to the furnace. Other components may or may
not be required. Read and follow the instructions provided with
the furnace.
INSTRUCTIONS FOR FURNACE CONNECTIONS:
THE FOLLOWING FURNACE CONNECTION INSTRUC-
TIONS ONLY PERTAIN TO ONE SPECIFIC FURNACE
MANUFACTURER, AND MAY NOT APPLY TO YOUR IN-
STALLATION.
Run a 12 volt DC positive lead to one of the gray wires in the
unit electrical box and secure with an approved connector.
Run a second lead from the furnace blower motor or terminal
board to the remaining gray lead in the unit electrical box. Se-
cure with an approved connector.