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Lennox XC21 User Manual

Lennox XC21
51 pages
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Page 46
506518−01
A175 MAIN
CONTROL
CONTROL PANEL
A177 FAN MOTOR CONTROL 
PULSE−WIDTH MODULATION (PWM)
ONE YELLOW WIRE FROM PS (E24) TERMINAL ON A175 MAIN
CONTROL. AND SECOND YELLOW WIRES ON PIGGYBACK
TERMINALS GOES TO S4 HIGH PRESSURE SWITCH.
GREEN
RED
BROWN
RED
BLACK
RED
RED
GREEN
A177 FAN
MOTOR
CONTROL
YELLOW
BLACK
YELLOW
BLUE
SEE TABLE 16 FOR CFM PROFILE
SELECTION OPTIONS.
BLACK WIRE
YELLOW WIRE
VAC
VDC
24
EXT PWR/R (24VAC INPUT
DURING DEMAND ONLY)
INPUT VOLTAGES DURING DEMAND
ECM/Y1 ONLY − 24VDC
BOTH ECM/Y1 AND ECM/Y2 − 24VDC AT EACH INPUT
ECM/Y2 ONLY − 24VDC
BLUE WIRE
YELLOW
YELLOW
YELLOW
S4 HIGH PRESSURE SWITCH
YELLOW
A175 MAIN CONTROL
B4 FAN
MOTOR
Figure 25. Testing for External Power to A177 Fan Motor Control

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Engineering Data36 pages

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Lennox XC21 Specifications

General IconGeneral
SEER Ratingup to 21.00
Sound Ratingas low as 69 dB
RefrigerantR-410A
Energy Star CertifiedYes
Compressor TypeTwo-Stage
Cooling Capacity (BTU/h)24000-54000
Warranty10-Year Limited Warranty on compressor

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