Lennox SCA 010 Installation, Operation & Maintenance Manual page 58

USING THE T7300 THERMOS USING THE T7300 THERMOS USING THE T7300 THERMOST T T T T A A A A A T T T T T USING THE T7300 THERMOS USING THE T7300 THERMOS
TERMINAL DESIGNATION AND DESCRIPTIONS (continued)
Standard terminal Alternate terminal
designations designations
R
RC
RH
T, T
W1
W2 H2, R4, W3, Y
W3
X B
X1, X3 A, A1, A2, C, L, X, Z
X4
Y1
Y2
Y3
-
-
-
-
-
a
: Some OEM models reverse the economiser terminal designation A1 and A2
b : Some OEM models label the terminal for transformer common B
Typical connection
V 24V system transformer
- 24V cooling transformer
- 24V heating transformer
- Remote sensor input for T7047
H1, R3 Auxiliary heat relay (Q7300 D)
Stage 2 heating relay
- Stage 3 heating relay
b
, C, X1, X2 Common
User defined Light Emiting Diodes
(LEDs)
- LED Common
Stage 1 compressor contactor (Q7300
C1, M, Y
D)
Stage 2 cooling compressor
(conventional)
C2
Stage 2 compressor contactor (heat
pump)
- Stage 3 cooling compressor
C, H, L HSII control panel
O Momentary circuit changeover
P Defrost
R1, R2 Low- and high-speed fan relays
External temperature readout, T-relay ;
T
Outdoor thermistor
Function Terminal type
Input
Input
Input
Input
Output 24V powered contact
Output 24V powered contact
Output 24V powered contact
Input
Annunciation
Annunciation
Output 24V powered contact
Output 24V powered contact
Output 24V powered contact
-
-
-
-
-
IOM / Rooftop Smart and Linéa™ Range - Page 57
-
-
-
-
-
-
-
-
-
-