Lux Products LuxPro P521U Installation And Operating Instructions Manual page 11

3, 4 WIRES
Factory RH-RC Jumper Wire Installed
O B G
G
F
FAN
NOTE: THE BLACK TERMINAL LETTERS ARE TYPICAL, GRAY TERMINAL LETTERS ARE BRAND SPECIFIC
1-STAGE, COOLING ONLY
Y RC RH W1
Y R
Y1 RC
6 V
SYSTEM COMMON
SYSTEM 24V
TRANSFORMER
#3
A W2 C
C
X
B*
O
P
T
I
O
N
A
L
AIR
CONDITIONER