Page 10
DANGER
Disconnect power from unit and
wait at least five minutes to allow
capacitors to discharge before at-
tempting to adjust motor speed tap
settings. Failure to wait may cause
personal injury or death.
External Operation (Speed Tap Priority)
Figure 8 shows the two quick-connect jacks (J48 and J49)
which connect the motor to the 15CHAX. Jack J48 is the
power plug and jack J49 connects the unit controls to the
motor.
Line voltage must be applied to J48 pin 5 in order for the mo-
tor to operate. When using 120VAC pins 1 and 2 must be
jumpered. When control voltage is applied to J49 pin 3 and
15, the motor is energized on the continuous fan mode.
When voltage is applied to J49 pin 2 in addition to pin 3 and
15 (first stage heating), the blower is energized on the low
speed heating tap. When voltage is applied to J49 pin 13 in
addition to pin 3 and 15 (second stage heating), the blower
is energized on the high speed heating tap. The motor as-
signs priority to J49 pin 2 so that if a call for cooling and a call for
heating are concurrent, heating call overrides and the blower
operates on high speed heating tap.
FIGURE 8
POWER
CONNECTOR J48
CONTROL
CONNECTOR J49
BLOWER B3 HARNESS CONNECTORS
J49
PIN 1 - C1
PIN 2 - W / W1
PIN 3 - C2
PIN 4 − Delay
PIN 5 - Cool
PIN 6 - Y1
PIN 7 - Adjust
PIN 8 - 0ut
PIN 9 - 0
PIN 10 - DS(PWM)
PIN 11 - Heat
PIN 12 - R
PIN 13 - EM / W2
PIN 14 - Y / Y2
PIN 15 - G
PIN 16 - Out +
J48
PIN 1 - Jumper PIN 1 to PIN2 for 120VAC line input only.
PIN 2 - Jumper PIN 1 to PIN2 for 120VAC line input only.
PIN 3 - Ground
PIN 4 - AC Line
PIN 5 - AC Line
1
1
Precautions
If the 15CHAX or its electronically controlled blower motor is
improperly or inadequately grounded, it may cause television
interference (commonly known as RFI or radio frequency inter-
ference).
This interference is caused by internal switching fre-
quencies of the motor controller. TV interference may
show up as small specks or lines which randomly appear on
the TV screen accompanied by pops or clicks in the sound. Be-
fore attempting any service, make sure the indoor unit is caus-
ing the interference. To check, disconnect power to indoor unit
then check TV for continued signs of interference.
TV interference may be stopped by making sure the mo-
tor is solidly grounded to the cabinet (metal to metal) and
by making sure the cabinet is solidly grounded. If TV inter-
ference persists, make sure the television (and all affected
RF appliances) are moved away from the 15CHAX. Also make
sure affected appliances are connected to a separate electrical
circuit.
