Tjernlund CPC-3 Constant Pressure Controller Startup Manual 8504125 - Manual (Page 11)

PRE-START UP FIELD WIRING VERIFICATION
The CPC-3 has two sets of terminal strips across the top of its circuit board. All mechanical draft related connections are made on the
"INDUCER" terminal strip located on the top left side of the circuit board. All mechanical combustion air related connections are made
on the "COMBUSTION AIR" terminal strip located on the top right side of the circuit board. IMPORTANT: It is critical that wiring con-
nections below are correct.
1. Verify Transducer connections (Red terminal blocks of Inducer or Combustion Air terminal strip) G, R & B are wired to
the corresponding letter on the TD-Series transducer terminal strip. Failure to maintain proper polarity may damage transducer.
IMPORTANT: These wire leads must be enclosed within dedicated metal conduit. Do not run any other power leads in the same
conduit or share a junction box with any other leads.
2. The inducer or combustion air manual mode proving switch, model PSA-1 should be connected to terminals P1 and P2 of the
Inducer or Combustion Air terminal strip. These leads may share conduit with other circuits within the mechanical room.
3. The free end of the CPC-3/VFD communications cable should be wired to the blue, black and green terminal blocks of the CPC-3
inducer or combustion air terminal strip. It is critical that the colored leads be connected to the exact terminals as depicted on the
wiring schematic. If the cable has been extended in the field wire labels should have been affixed indicating the terminal block des-
ignations. IMPORTANT: These wire leads must be enclosed within dedicated metal conduit. Do not run any other power leads in
the same conduit or share a junction box with any other leads.
START UP OF VSAD-SERIES AND VSUB-SERIES VARIABLE SPEED SYSTEMS WITH THE CPC-3
POWERING UP THE CPC-3
Switch the Power switch on lower left of board to the left. After a brief moment, the display will come on and display will read "CPC-3
CPC-3" on all 4 lines. This indicates that the CPC-3 is functioning and going through it's power-up routine.
INITIALIZING & PROGRAM SETTINGS
When the CPC-3 is powered up, it retrieves the saved system settings from memory and loads them into the program. During the ini-
tializing process, the control will display the saved system settings as well as other useful information.
10
CPC-3 MAIN POWER INPUT WIRING & HEATER INTERLOCK WIRING
FIGURE 8055017
CPC-3 POWER SUPPLY WIRING
SUPPLY POWER HERE FROM A TJERNLUND VFD,
"L" AND "L" TERMINALS, OR FROM ANOTHER
GROUND LUG
WITH NUT
N L L N L N L N
POWER INPUT
MAIN AC EXP-4E
POWER OUTPUT TERMINALS HEATER 1
POWER
DIGITAL
ANALOG AND
SUPPLIES
3 4 1 2 A B 3 4 1 2 A B
AC POWER
MAIN
ON OFF
#1 #2
TERMINAL INTERLOCK
CPC-3 MAIN POWER SPECIFICATIONS:
THE CPC-3 HAS BUILT-IN CIRCUIT PROTECTION.
12/10/04
ON / OFF
SWITCH
DRY1
A24V
A115V B115V
B24V
DRY2
OR
24 VAC
OR
115 VAC
OR
230 VAC
OR
CALL METHOD
"DRY"
CALL HOT NEUTRAL
CALL METHOD
"VOLTAGE"
2 2
3
RELAY
SAFETY
RELAY
SAFETY
BLOCK
WIRE ANY ADDITIONAL
REQUIRED INTERLOCK
BLOCKS THE SAME AS
THE HEATER 1 INTER-
LOCK BLOCK.
HEATER 2
INTERLOCK
BLOCK
0.50 AMP MAXIMUM @ 95-265 VAC.
120 / 208-230 VAC POWER SOURCE.
INTERLOCKED
HEATER
RUN SIGNAL
CALL VOLTAGE FROM INTERLOCKED
HEATER CONTROL CIRCUIT
USER-PROVIDED
CALL SWITCH
WIRE
CALL
JUMPER
WIRE
CALL
JUMPER
1 1
HEATER INTERLOCK
CALL METHODS
If using the “Dry” call method,
place the RED jumper tab in
the “DRY” position. Remove the
Wire Call Jumper that routes
voltage from terminal 1 to 3.
If using the “Voltage Call
Method”, place the RED jumper
tab in either the 24V or 115V
position depending upon heater
interlock voltage.
The Wire Call Jumper routes
the “voltage” hot call signal
form the #1 position to the #3
position. When the CPC-3 safe-
ty relay closes, this voltage is
routed to position #4 and the
interlocked burner.
If activating the CPC-3 with a
different call voltage than that
of the interlocked burner run
signal, remove the Wire Call
Jumper and provide the con-
trolled voltage to position #3.