Tjernlund CPC-2 Constant Pressure Controller (Discontinued) 8504091 Rev A 03/01 - Manual (Page 6)

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CPC-2 CIRCUIT BOARD CALL OUTS
1) ALARM: Dry contacts will close with a Venter Fault or any fault that requires manual resetting. These faults include the Venter,
Start-up, Prover 1 or Prover 2 Faults. Connect to aux. alarm or building mgmt. system. Rated for 1/4 h.p. @ 120 VAC.
2) SERIAL PORT: For inputting future program updates and outputting stored data.
3) PROVER 2: Connection to auxiliary prover for second CPC-2 controlled device. (i.e. Combustion Air In-Forcer or future needs)
4) VENTER 2: Connection to VFD of second CPC-2 controlled device. (i.e. Combustion Air In-Forcer) (0-10 VDC output)
5) SENSOR 1: Connection to vent pressure Transducer to regulate Venter / Inducer speed. (0-10 VDC input)
6) SENSOR 2: Connection to secondary vent pressure Transducer that communicates with CPC-2 to regulate motor speed of
secondary device. (i.e. Combustion Air In-Forcer) (1-12 VDC input)
7) SENSOR 3: Connection to future sensor (open connection, not currently programmed) (0-10 VDC input)
8) SENSOR 4: Connection to future sensor (open connection, not currently programmed) (0-10 VDC input)
9) VENTER 1: Connection to VFD of Venter / Inducer. (1-10 VDC output)
10) PROVER 1: Connection to secondary Fan Prover, i.e. PSA-1 adjustable Fan Prover.
11) MOTOR SENSOR: Green LED indicates that Venter check circuit, i.e. motor limits, housing access limits, high limits, etc.,
are closed and in an acceptable condition.
12) DISPLAY: CPC-2 connection to ribbon cable from display. Ribbon cable printing must face towards top of CPC-2 electrical box.
13) MOTOR SENSOR TERMINAL STRIP: Connects to terminal strip of VFD to lock out interlocked appliances if any motor limit
trips. Relay closes alarm dry contacts (position 1).
14) 18-130 VAC JUMPER TAB: Jumper tab must be removed for 230 VAC interlock with appliance #1.
15) CALL 1: Yellow LED indicates that 1st interlocked appliance is calling for heat.
16) APPLIANCE ON 1: Green LED indicates that vent pressure set point has been reached/maintained and the interlocked
appliance call for heat signal has been delivered to the burner control circuit.
17) RESET BUTTON: Used to soft boot CPC-2 control.
18) CALL 2: Yellow LED indicates that 2nd interlocked appliance is calling for heat.
19) APPLIANCE ON 2: Green LED indicates that vent pressure set point has been reached/maintained and the interlocked
appliance call for heat signal has been delivered to the burner control circuit.
20) DRY CONTACT JUMPER TAB: Jumper tab must be installed if using dry contacts for interlock with appliance #1. Important:
Do not use appliance #1 interlock terminal strip (position 30) if using dry contact actuation.
21) APPLIANCE #1 INTERLOCK JUMPER: Routes intercepted control circuit “hot” voltage from position #1 to position #3, completing
circuit back to appliance through position #4 when all safeties are closed. Normally
kept in place. If removed user can actuate the CPC-2 with one voltage and actuate
the appliance control circuit with another.
22) DRY CONTACT JUMPER TAB: Jumper tab must be installed if using dry contacts for interlock with appliance #2. Important:
Do not use appliance #2 interlock terminal strip (position 32) if using dry contact actuation.
23) 18-130 VAC JUMPER TAB: Jumper tab must be removed for 230 VAC interlock with appliance #2.
24) APPLIANCE #2 INTERLOCK JUMPER: Routes intercepted control circuit “hot” voltage from position #1 to position #3, completing
circuit back to appliance through position #4 when all safeties are closed. Normally
kept in place. If removed user can actuate the CPC-2 with one voltage and actuate
the appliance control circuit with another.
25) KEYPAD: CPC-2 connection to ribbon cable from keypad.
26) SYSTEM POWER LIGHT: Red LED indicates that the CPC-2 has power.
27) VOLTAGE SELECTION SWITCH: Allows the installer to select between 115 VAC and 230 VAC for the main power input to the CPC-2.
28) ON/OFF SWITCH: Turns power to CPC-2 on or off.
29) APPLIANCE #1 DRY CONTACT INTERLOCK TERMINAL: For dry contact actuation of CPC-2. Must install jumper at position 20.
30) APPLIANCE #1 INTERLOCK TERMINAL : Term. 1 & 2: 24 to 230 VAC input, Term. 3 & 4: Contacts rated 1 hp @ 120 VAC.
31) APPLIANCE #2 DRY CONTACT INTERLOCK TERMINAL: For dry contact actuation of CPC-2. Must install jumper at position 21.
32) APPLIANCE #2 INTERLOCK TERMINAL: Term. 1 & 2: 24 to 230 VAC input, Term. 3 & 4: Contacts rated 1 hp @ 120 VAC.
33) EXPANSION BOARD 1: Terminal strip power and ribbon cable interlock connection to optional EXP-4 appliance interlock
expansion board. (Controls appliances 3 - 6)
34) EXPANSION BOARD 2: Terminal strip power and ribbon cable interlock connection to optional EXP-4 appliance interlock
expansion board. (Controls appliances 7 - 10)
35) EXPANSION BOARD 3: Terminal strip power and ribbon cable interlock connection to optional EXP-4 appliance interlock
expansion board. (Controls appliances 11 - 14)
36) MAIN POWER: Primary power connection for CPC-2. May be wired to either 115 VAC single phase or 230 VAC single phase.
Also provides power to any EXP-4 expansion boards connected to CPC-2.
37) CPC-2 MAIN POWER INPUT FUSE: Replaceable 1.5 amp fuse.
PR