STATUS FUNCTION LIGHTS
A system control STATUS function light is located on the outdoor
unit control board (See Fig. 15). The STATUS light provides
signals for several system operations. See Table 8 for codes and
definitions. Table 8 also provides the order of signal importance.
NOTE: Only one code will be displayed on the outdoor unit
control board (the most recent, with the highest priority).
FACTORY DEFAULTS
Factory defaults have been provided in the event of failure of
outdoor air thermistor and/or outdoor coil thermistor. Refer to
Table 9 for default and function.
ONE MINUTE SPEED CHANGE TIME DELAY
When compressor changes speeds from high to low or low to high,
there is a 1-minute time delay before compressor restarts. The
outdoor fan motor remains running.
COMPRESSOR OPERATION
When the compressor operates in two capacity operation, the
motor rotates clockwise. Both the lower and upper pistons are
eccentric with the rotating crankshaft, and both compress refrig-
erant. When the compressor operates in single capacity the motor
reverses direction (rotates counter-clockwise). The lower piston
becomes idle since it is not eccentric with the compressor
crankshaft and the upper piston which is eccentric with the rotating
crankshaft compresses refrigerant. The start and run windings are
reversed.
FIVE-MINUTE HIGH-SPEED MINIMUM
If unit has not operated within the past 12 hours, or following a
unit power-up, upon the next thermostat high- or low-speed
demand, unit operates for a minimum of 5 minutes in high speed.
CRANKCASE HEATER OPERATION
The two-speed control energizes crankcase heater during unit’s off
cycle.
OUTDOOR FAN MOTOR OPERATION
The two-speed control energizes outdoor fan any time compressor
is operating. The outdoor fan remains energized during the
1-minute speed change time delay and if a pressure switch or
compressor overload should trip. Outdoor fan motor will continue
to operate for one minute after the compressor shuts off when the
outdoor ambient is greater than 100°F.
After termination of a defrost cycle, the outdoor fan delays coming
on for 20 sec. This allows refrigerant system to recover outdoor
coil heat and minimize the “steam cloud” effect.
DEFROST TIME SELECTION
The defrost interval can be field selected, dependent on local or
geographical requirements. It is factory set at 90 minutes but can
be changed to either 30, 60, or 120 minutes. To select defrost time,
set dip switches located on the left side of the unit board (See Fig.
15). See Table 9 for Defrost Dip Switch Settings.
COOL/HEAT
STAGE 1
COOL/HEAT
STAGE 2
R
W/W1
Y/Y2
O/W2
Y1/W2
G
24 VAC COMM
N/A
OUTDOOR
SENSOR
CONNECTION
C
B
S1
S2
C
Y2
C
PROGRAMMABLE
THERMOSTAT
MODEL 2S
SINGLE-STAGE
FURNACE
TWO-SPEED
HEAT PUMP
See notes 7, 9, 11,14 and 24
W
R
Y1
R
O
W1
G
Y
H
R1
FAN
HEAT STAGE 3
RVS COOLING
24 VAC HOT
A00364
J
24 VAC HOT
24 VAC COMM
HEAT STAGE 3
R
C
G
W/W1
Y/Y2
R
C
RVS COOLING
Y1
B
S1
S2
C
O
NON-PROGRAMMABLE
THERMOSTAT
MODEL 2S
SINGLE-STAGE
FURNACE
TWO-SPEED
HEAT PUMP
See notes 7, 10, 11, 14 and 24
G
O/W2
W
R
Y
Y2
Y1
H
R1
COOL/HEAT
STAGE 2
FAN
COOL/HEAT
STAGE 1
N/A
OUTDOOR
SENSOR
CONNECTION
W1
A00365
K
Fig. 13—Typical 24-V Circuit Connections (Cont’d)
13
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