FAN MOTOR CONTROL (A177) PULSE−WIDTH MODULATION (PWM)
CONTROL BOX
INPUT VOLTAGES DURING DEMAND
ECM/Y1 ONLY − 24VDC
YELLOW WIRE
HEAT PUMP | BLUE WIRE | |
CONTROL (A175) | ||
|
24
BLACK WIRE
VDC VAC
ONE YELLOW WIRE FROM PS (E24) TERMINAL ON HEAT PUMP |
|
|
CONTROL (A175) AND SECOND YELLOW WIRES ON PIGGYBACK | EXT PWR/R (24VAC INPUT |
|
TERMINALS GOES TO S4 HIGH PRESSURE SWITCH. |
| |
DURING DEMAND ONLY) |
| |
GREEN |
|
|
RED | GREEN |
|
|
| |
| RED |
|
| RED | B4 FAN |
|
| |
RED | BLACK MOTOR | |
|
| |
| BROWN |
|
YELLOW |
|
|
S4 HIGH PRESSURE SWITCH | YELLOW |
|
| BLUE |
|
| BLACK |
|
YELLOW
YELLOW
YELLOW YELLOW
FAN MOTOR
CONTROL
SEE TABLE 16 FOR CFM PROFILE
SELECTION OPTIONS.
HEAT PUMP CONTROL
Figure 35. Testing for External Power to Fan Motor Control
Page 49
XP17 SERIES
