Tjernlund UC1 Universal Control (Version X.04) 8504107 Rev C 02/04 - Manual (Page 6)

All wiring from the UC1 to the appliance 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 Venter motor is energized. After draft is established, the
Fan Proving Switch closes within 5 to 10 seconds energizing terminal “4”, which completes the circuit allowing burner to fire.
NOTE: If a Venter pre-purge is selected, the burner will not fire until the pre-purge time is finished. The Venter will continue to run
after the burner has finished firing for the set post-purge time cycle. The UC1 is set for a 2 minute post-purge time period from the
factory. 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
The Ground lead, Venter motor and Fan Prover leads are factory connected to the UC1 circuit board. Venter Ground, motor and
Fan Prover wiring connections are made at the free end of the 2 foot whip.
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.
5
IMPORTANT:
RED JUMPER POSITION MUST BE THE SAME
AS APPLIANCE INTERLOCK VOLTAGE.
CALL
RELAY
INTERLOCK
COMMON NEUTRAL
PRO
DUCT
S,
INC.
MOTOR
1 H.P. MAX @ 115 VAC
SUPPLY
115 VAC
50/60 Hz
R
T
JERNLUND 9183006
NO
MTR
M
MOTOR
RELAY
N
COM
NO
115 VAC
24 VAC
D/N 1303958-1
DO NOT SUPPLY VOLTAGE
TO "A" OR "B".
DO NOT SUPPLY POWER!
5 VDC BOARD-GENERATED POWER
HOT
24 VAC
USER-PROVIDED
CALL SWITCH
LINE
OR
"DRY"
OR
1
15V
J2
COM
24
V
DR
Y
LEGEND:
115 VAC
5
POST-PURGE SETTINGS
FOR TJERNLUND
TO P1, P2, C, GND
AUXILIARY
OR F. DOING SO
WILL DAMAGE THE
CONNECT POWER
OPEN PROVER OPTION
(9)
(3 - 8)
9
78
6
CONTROL.
DEVICES. DO NOT
F
GN
D
ON
LED1
PRE-PURGE SETTINGS
LED5 LED4 LED2 LED3
(1 - 2) 24
3
1
C
P1
P2
PROVER
J1
XL
XN
115 OR 24 VAC FROM CALL JUMPER
OR USER-PROVIDED VOLTAGE
FROM TERMINAL 3 TO 4 WITH CALL
JUMPER REMOVED
K2
K1
APPROVED
MAC1E OR MAC4E
JUMPER
RED RED GREEN GREEN AM
BER
WARNING: Disconnect power supply from the UC1 and heating equipment when making wiring connections and servicing the
Venter. Failure to do so may result in personal injury and/or equipment damage. LED #5 (RED) should be off with
power removed.