Tjernlund DCOP1 Constant Operating Pressure Draft Control 8504174 (Discontinued) User Manual
Page 8
7
UC1 UNIVERSAL CONTROL WIRING
All wiring from the UC1 to the appliance(s) must be appropriate Class 1 wiring as follows: installed in rigid metal conduit, intermediate
metal conduit, rigid non-metallic conduit, electrical metallic tubing, Type MI Cable, Type MC Cable, or be otherwise suitably protected
from physical damage
SEQUENCE OF OPERATION WITH UC1 UNIVERSAL CONTROL AND 24 VAC OR 115 VAC HEATER CONTROL CIRCUIT:
Control signal from thermostat, aquastat, primary control or gas valve is intercepted and routed to terminal "1" on UC1 terminal
strip. When terminal "1" is energized with either 24 VAC or 115 VAC, the COP controller energizes the Inducer motor. After draft is
established, the PSA-1 Fan Proving Switch closes energizing terminal "4", which completes the circuit allowing burner to fire.
NOTE:The burner will not fire until the 5 second factory set pre-purge time is finished. The Inducer will continue to run after the
burner has finished firing for the 2 minute factory set post-purge time. See "Pre / Post-Purge Settings" on page 3 for details.
The "1" input terminal on the UC1 can accept either a 24 VAC or 115 VAC control signal. IMPORTANT: The RED voltage
jumper must be positioned based on appliance interlock voltage 24V or 115V. If using the “DRY” contact activation method, use
terminals A & B on UC1 control and position the RED voltage jumper tab in the “DRY” position. See millivolt appliance interlock
diagram for further information. IMPORTANT: Only one interlock method (i.e. 24V, 115V or “Dry”) can be used with the UC1.
Multiple appliance interlocks require the use of our MAC-Series multiple appliance controls.
The steps listed under each diagram are intended as a supplement to the diagram. Wiring colors or designations may vary by
manufacturer. If you are unable to wire the UC1 as outlined in these instructions, call Tjernlund’s Customer Service Department
toll free at 1-800-255-4208 for assistance.
IMPORTANT: If the call for heat interlock signal or 115 VAC power is removed, the UC1 board will reset and any fault, if present,
will be stored in memory instead of displayed. See page 3, “Checking Memory for Last Fault Code”.
UC1 UNIVERSAL CONTROL WIRING SCHEMATIC
IMPORTANT: MORE THAN ONE INTERLOCK METHOD MAY BE APPLICABLE
In many cases it is easier to interlock with the thermostat/aquastat portion of the heater control circuit vs. the ignition module /
primary control portion of the heater control circuit. Review all of the wiring diagram options prior to choosing the best method.
K1
INTERLOCK
RELAY
J1
COM
J2
JUMPER
CALL
G
R
EEN
RE
D
RE
D
AMBER
BL
U
E
MAC1E OR MAC4E
DEVICES. DO NOT
CONNECT POWER
WILL DAMAGE THE
OR F. DOING SO
TO P1, P2, C, GND
FOR TJERNLUND
GND
8
9
F
CONTROL.
AUXILIARY
34
2
67
5
C
1
P1
ON
P2
AS APPLIANCE INTERLOCK VOLTAGE.
RED JUMPER POSITION MUST BE THE SAME
DO NOT SUPPLY VOLTAGE
TO "A" OR "B".
IMPORTANT:
LED3
LED5 LED4
LED2 LED1
LED6
NEUTRAL
LINE / HOT
COMMON /
CALL SWITCH
USER-PROVIDED
INTERCEPTED
CALL FOR
APPROVED CALL
OR
HEAT
"DRY"
P2 PROVER ON
TERMINAL STRIP
FACTORY WIRED
TO DCOP1 P1 AND
FACTORY WIRED TO
L AND N ON DCOP1
TO DCOP1 T6 AND T9
FACTORY CONNECTED
POWER TERMINALS
24 OR 115 VAC
APPROVED CALL BACK TO HEATER
INTERCEPTED CALL COMMON OR NEUTRAL
24 OR 115 VAC INTERCEPTED CALL FOR HEAT
5 VDC BOARD-GENERATED POWER
DO NOT SUPPLY POWER!
115 VAC
LEGEND:
TERMINAL 2:
TERMINAL 1:
TERMINAL 4:
FIGURE 8050029 3-28-11
LE
D
PO
W
E
R
RE
D
DRY
24V
115V
(1 - 2)
PRE-PURGE SETTINGS
(3 - 8)
(9)
OPEN PROVER OPTION
POST-PURGE SETTINGS
RELAY
MTR
NO
INC
.
9
183006
TJE
R
NL
U
N
D
PR
OD
U
C
T
S
,
R
XL
K2
MOTOR
COM
M
N
XN
NO
WARNING: Disconnect power supply from the DCOP1 and heating equipment when making wiring connections and servicing the
Inducer. Failure to do so may result in personal injury and/or equipment damage. LED #6 (RED) should be off with
power removed.