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APPENDIX E - Connection Diagram
OUTPUT 1 (Top)
24V center-tap
Transformer
Line Voltage input
240V, 208V, or 120V
Relay
Top
Relay
Middle
Relay
Bottom
CENTER-TAP
AC 1
AC 2
OUTPUT 3 (Bottom)
OUTPUT 2 (Middle)
OUTPUT 4 (for fan or auxiliary device)
Safety Output
+
+
+
Connections for
optional
Current Sensor
White
Black
Thermocouple Header - 2 Pins
Type K - No jumper
Type S - Jumper connecting pins
2 Pin header
for
connecting
computer
Socket for
communications
chip
Label with software number
and serial number is
wrapped around this
capacitor
For 1 zone,
(single T/C) use
T/C 2
connections.
For 2 zone, use
T/C 1 and T/C 2
connections.
For 3 zone, use
T/C 1, T/C 2, and
T/C 3
With a single
thermocouple (single
zone control), Output 2 is
connected to all relays
and Outputs 1 & 3 do not
have wires connected.
Type K thermocouple: RED lead (-), YELLOW (+)
Type S thermocouple: RED lead (-), BLACK (+)
T/C
2
T/C
1
T/C
3