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O/W2
Y1
R
G
Y/Y2
W/W1
C
B
L
S1
S2
COMMERCIAL
THERMOSTAT
W1
W2
Y1
Y2
G
C
X
DO NOT USE
R
*
CONNECTION
BOARD
548D036-120
549B036-120
551B036-150
558D036-150
580D036-150
581B036-150
*Does not apply to 558D and 580D036-150 units.
NOTES:
1. 558D and 580D036-072 units only have one stage of cooling, but
can have 2 stages of heat. In these applications set DIP switch B
to ON for 2-stage operation.
2. For 548D and 549B heat pump applications, set switch A to OFF
(air conditioning). The 548D and 549B units do not have an ‘‘O’’
terminal.
O/W2
Y1
R
G
Y/Y2
W/W1
C
B
L
S1
S2
COMMERCIAL
THERMOSTAT
W1
W2
Y1
Y2
G
C
X
DO NOT USE
R
TB2
551A155-240
559E180-240
559F180-300
579E180-240
579F180-300
581A155-240
Fig. 2 — Thermostat Wiring (551A155-240; 559E180-240; 559F180-300;
579E180-240; 579F180-300; 581A155-240)
Fig. 1 — Thermostat Wiring (548D036-120; 549B036-120; 551B036-150;
558D036-150; 580D036-150; 581B036-150)
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