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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 Inducer 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 an Inducer pre-purge is selected, the burner will not fire until the pre-purge time is finished.  The Inducer 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”.

UCRT UNIVERSAL CONTROL WIRING SCHEMATIC (UC1 WITH SPEED CONTROL)

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

INTERCEPTED

CALL FOR

LE
D

PO

WE

R

RED

DRY

24V

115V

1 - 2

PRE-PURGE SETTINGS

3 - 8

9

OPEN PROVER     OPTION

POST-PURGE SETTINGS

RELAY

MTR

NO

SUPPLY

50/60 Hz

115 VAC

INC.

9183006

TJ
E

RNL

UND

P

R

O

DUCTS

,

R

NEUTRAL

LINE / HOT

APPROVED CALL

COMMON /

OR

HEAT

"DRY"

XL

K2

MOTOR

COM

M

N

XN

NO

INTERLOCK

RELAY

J1

COM

J2

JUMPER

CALL

GRE

E

N

RED

RED

AM

BE
R

BL
UE

FIGURE 1303241RS    5/10/11

MAC1E OR MAC4E

PSA-1 FAN

DEVICES.  DO NOT
CONNECT POWER

WILL DAMAGE THE

OR F.  DOING SO

TO P1, P2, C, GND

FOR TJERNLUND

GN

D

8

9

F

CONTROL.

AUXILIARY

34

26

7

5

C

1

P1

ON

P2

24 OR 115 VAC

APPROVED CALL BACK TO HEATER

INTERCEPTED CALL COMMON OR NEUTRAL

24 OR 115 VAC INTERCEPTED CALL FOR HEAT

AS APPLIANCE INTERLOCK VOLTAGE.

RED JUMPER POSITION MUST BE THE SAME

5 VDC BOARD-GENERATED POWER
DO NOT SUPPLY POWER!

CALL SWITCH

USER-PROVIDED

DO NOT SUPPLY VOLTAGE

TO "A" OR "B".

115 VAC

LEGEND:

IMPORTANT:

LED

LED LED

LED LED

TERMINAL 2:

TERMINAL 1:

TERMINAL 4:

LED

TO INDUCER WHITE LEAD AND WHITE/RED LEAD

TO INDUCER BLACK LEAD

OFF

6 AMPS MAX TO INDUCER RED LEAD

ON LOW

HIGH

SPEED CONTROL

ON

3

5

4

2

1

6

PROVER

BLACK

WHITE

RED

RED

YELLOW

BLUE

WARNING:

Disconnect power supply from the UC1 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. 

Summary of Contents for UCRT

Page 1: ...ESE INSTRUCTIONS MAY RESULT IN IMPROPER INSTALLATION ADJUST MENT SERVICE OR MAINTENANCE POSSIBLY RESULTING IN FIRE ELECTRI CAL SHOCK CARBON MONOXIDE POISONING EXPLOSION PERSONAL INJURY OR PROPERTY DAM...

Page 2: ...ight carrier and your distributor immediately and file a concealed damage claim INSTALLATION RESTRICTIONS 1 The Pre Cycle Prover Status Check is deactivated from the factory on the UCRT Natural chimne...

Page 3: ...ED POWER LED DRY 24 V 115 V APPLIANCE INTERLOCK RELAY INDUCER MOTOR RELAY A B 1 2 3 4 L N J1 J2 XL XN P1 P2 C GND F 1 9 N M MTR J1 J2 CALL JUMPER Used when the call signal is used as the proven return...

Page 4: ...be cleared NOTE The UC1 board must have its 115 VAC power supply present when any of the 1 8 dip switches are moved back to their original position for the fault code to clear PRE POST PURGE AND PROVE...

Page 5: ...VOLTAGE SOURCE IS PROVIDED TO TERMINAL 3 120 VAC 10 50 60 Hz MOTOR 1 H P MAX 120 VAC 50 60 Hz USER PROVIDED 24 VAC AT TERMINALS 1 2 1 CALL HOT 2 COMMON CONTROL REQUIRES 5 mA 24 VAC TO TRIGGER MOVE RE...

Page 6: ...ed 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 boa...

Page 7: ...heaters To interlock a millivolt water heater and a 24 115 VAC furnace or boiler add the WHKE and MAC1E MILLIVOLT HEATER INSTALLATIONS Each millivolt appliance interlocked with the UC1 must have its o...

Page 8: ...arity sensitive NOTE If burner safety control goes out on lockout the Inducer will continue to run as long as a call for heat is present UC1 UNIVERSAL CONTROL CONNECTED WITH A 24 VAC ELECTRONIC IGNITI...

Page 9: ...und wires in UCRT to supply ground Important Installer must supply overload and disconnect protection 5 If not previously completed connect Black White and Red leads from UCRT to like colors in Roofto...

Page 10: ...ol goes out on lockout the Inducer will continue to run as long as a call for heat is present UC1 UNIVERSAL CONTROL CONNECTED TO A HONEYWELL R7184 SERIES OR EQUIVALENT PRIMARY CONTROL WITH A LINE VOLT...

Page 11: ...lue and Yellow leads from UCRT to PSA 1 Fan Prover switch Prover Leads are not polarity sensitive NOTE If burner safety control goes out on lockout the Inducer will continue to run as long as a call f...

Page 12: ...to the ground screw in the Rooftop Inducer whip 4x4 weatherproof box Connect Blue and Yellow leads from UCRT to PSA 1 Fan Prover switch Prover Leads are not polarity sensitive UC1 UNIVERSAL CONTROL C...

Page 13: ...that a slight positive draft neutral to 0 01 W C or 2 5 Pa is measured at the appliance draft sampling location Flue gases should just start to spill from the draft hood draft diverter or barometric d...

Page 14: ...original position the fault code will be cleared NOTE The UC1 board must have its 115 VAC power supply present when any of the 1 8 dip switches are moved back to their original position for the fault...

Page 15: ...4 Red will be reset if the call for heat interlock signal or 115 VAC power is removed If the fan prover makes on start up but breaks for more than 10 seconds during the burner cycle LED 4 will flash...

Page 16: ...ined return it to your Tjernlund distributor for replacement Please include UCRT date code component was taken from The date code is located on the Electrical Box coverplate If the date code is older...

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