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Terminal identification
Fig. 6. Thermostat terminal assignments
WARNING
DO not apply line voltage to source pins.
You can remove the jumper only if you have R and
RC wires.
Table 1. Terminal identification
Terminal
Label
24VAC power from heating Class
R
2 transformer
24VAC common (Neutral). For 2
24VAC
transformer systems, use
C
common wire from cooling
transformer
1
Universal input/output
UIO1
COM
Common
2
Universal input/output
UIO2
COM
Common
1
Universal input
UI1
COM
Common
2
Universal input
UI2
COM
Common
Sylk bus, master, power output
Sylk
Sylk bus, master, power output
+
BACnet Communications
RS485
_
BACnet Communications
Jumper between R and RC for
single transformer system,
R-RC
remove the jumper in two
transformer system.
Connection
5
TC500A-N/TC500A-W COMMERCIAL THERMOSTAT
Table 1. Terminal identification (Continued)
Terminal
Label
24VAC power from cooling Class
RC
2 transformer
G
Fan
Relay output, Compressor
Y1
contactor (stage1)
Relay output, Compressor
Y2
contactor (stage2)
24VAC
Relay output, Compressor
Y3
contactor (stage3)/Configurable
Output
W1
Relay output, Heat (stage1)
W2
Relay output, Heat (stage2)
Relay output, Heat
W3
(stage3)/Configurable Output
Relay dry contact, Aux-1
Aux
Relay dry contact, Aux-2
Connection
31-00399M-01 | Rev.10-20
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