Page 33
1 − External Operation ICM1
(Speed Tap Priority)
Figure 37 shows the two quickconnect jacks (J48 and
J49) which connect the motor to the G21V/GSR21V. Jack
J48 is the power plug and jack J49 connects the unit con
trols to the motor. The power plug must be removed to gain
access to the incremental (speed) taps.
Line voltage must be applied to J48 pin 1 in order for the
motor to operate. When control voltage is applied to J49 pin
1 (low speed cooling), the motor is energized on the low
speed heat/cool tap.
When voltage is applied to J49 pin 2 in addition to pin1 (high
speed cooling), the blower is energized on the high speed
cooling tap. When voltage is applied to J49 pin 5 (heating
demand), the blower is energized on the low speed heat/
cool tap. The motor assigns priority to J49 pin 5 so that if a
call for cooling and a call for heating are concurrent, heat
ing call overrides and the blower operates on high speed
heating tap.
FIGURE 37
POWER
CONNECTOR J48
CONTROL
CONNECTOR J49
1 2 3 4
1
2
3
4
5
6
BLOWER B3 HARNESS CONNECTORS
INCREMENTAL
(SPEED) TAPS
PIN 1 − 24VAC* HalfRectified or PWM Input From J462.
(ON/OFF)
.
PIN 6 − Not Used.
PIN 3 − Not Used.
PIN 2 − From J464. (HI/LOW)1217VDC Straight Voltage
With CCB1 21VAC Without CCB1, PWM with Harmony.
PIN 5 − 24VAC* HalfRectified (HEAT).
PIN 4 − Control Common From J461.
J49
J48
PIN 1 − L1 Line voltage
PIN 2 − L2 (not used) − 230 Volt units (line voltage)
PIN 3 − Neutral, 115 volt units.
PIN 4 − Ground, Motor to Cabinet
*
NOTE−Electronically switched voltage cannot be accurately measured with conventional meters.
Do not attempt to measure this voltage. Follow diagnostic procedures outlined in this manual to
determine if motor and VSP1 are operating properly.
a − Blower Speed Taps "V" Units
Table 12 shows the factory set blower speeds. All speeds
shown are minimums. Do not change motor taps to oper
ate at speeds lower than the minimum or higher than the
maximum. Blower motor and cfm performance ratings are
listed in the Blower Data Section.
MODEL NUMBER
GSR21V3−80
FACTORY BLOWER SPEED TAP SELECTION
HIGH SPEED
COOLING
LOW SPEED
HEAT/COOL
HIGH SPEED
HEATING
3
11
7
6
11
2
G21/GSR21V5−100
TABLE 12
G21/GSR21V5−80
7
11
2
G21V3−60
2
11
6
G21V3−80
2
11
7
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.
Use the following procedure to change blower speed
selection for high, low or heat speed selection:
1 − Disconnect line voltage from unit.
2 − Wait 5 minutes.
3 − Disconnect AC power plug P48 from motor/controller.
See figure 37.
4 − Slide tap cover toward AC power plug. See figure 38.
5 − Remove the appropriate speed connector and place it
on the proper tap. See figure 39.
6 − When all connections are made to proper taps, close tap
cover and reconnect AC power plug to motor/controller
and reconnect line voltage to unit.
If any of the tap wires are left disconnected, the motor re
verts to default speed taps. If the black or red wires are left
off, the motor defaults to tap 11. If the white wire is left off,
the motor defaults to tap 5.
AC POWER
INLET PLUG
SPEED TAP COV
ER
(slides to left after
power plug is
removed)
CONTROL
INTERFACE PLUG
BLOWER MOTOR
CONTROLLER
FIGURE 38
BLOWER MOTOR CONNECTOR LOCATIONS
