Tjernlund UCRT Rooftop Inducer Universal Control (Version X.06) 8504162 Rev 01/10 - Manual (Page 15)

No voltage present from speed control: Replace UCRT Speed Control part number 950-8601.
Voltage present from speed control: Confirm voltage is present across Red & White lead in Rooftop Inducer 4x4 weatherproof junction box.
Voltage present: Inducer capacitor or motor may be defective.
SYMPTOM 3: INDUCER OPERATES, BUT BURNER DOES NOT
For any newly established call for heat the Inducer will run for 60 seconds to try to close the fan prover circuit (P1 to P2). If circuit
can not be made within 60 seconds LED #4 (Red) will flash 3 times, indicating a prover check circuit fault on UC1 start up. NOTE:
The UC1 safety circuit and LED #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 continuously indicating a
prover circuit fault. The Inducer will continue to run for 10 minutes to try to make the prover circuit as long as a call for heat exists.
If Prover does not make within 10 minutes, the UC1 will shut down and LED #4 (Red) will flash 4 times indicating a prover circuit
fault. Remove the call for heat and then reestablish to reset the UC1 prover safety circuit (P1 to P2) & LED #4 (Red).
Verify that LED #2 (Blue) is lit.
Yes, LED #2 (Blue) is lit: Verify that "call jumper" is connected from J1 to J2 on UC1 circuit board if using typical wiring where sup-
ply voltage from terminal 1 is routed to terminal 3 through “call jumper” then to 4 when appliance interlock relay makes. With call
for heat established, verify that wiring is correct by measuring voltage between terminals 1 & 2 and 2 & 4 of UC1 terminal strip.
Voltage should be the same in both cases, if not rewire per appropriate diagram or confirm burner control(s) are functioning prop-
erly. NOTE: If a different voltage source is provided to terminal 3 which is switched to terminal 4 or when using the A-B dry con-
tacts, voltage measurements may not apply. For millivolt installations make sure system Limits are reset and relight pilot.
No, LED #2 (Blue) is not lit: Remove power from UC1 and push dip switch #9 up or “on” to deactivate Fan Prover status check
which should always be deactivated with a Rooftop Inducer. Remove P1 and P2 prover leads off of Fan Prover switch and
jumper together. Reestablish power and call for heat. After Inducer pre-purge, if set (up to 35 seconds), LED #2 (Blue) should
light.
No, LED #2 (Blue) does not light: Replace UC1 circuit board, part number 950-8804.
Yes, LED #2 (Blue) lights up: The fan proving switch may not be closing, wiring connections are incorrect/broken or burner con-
trol(s) are not functioning properly. With Inducer running, verify that Inducer performance is sufficient to close Fan Prover contacts
by checking for continuity across switch. Adjust speed control to a higher speed if necessary. Replace Fan Prover leads from P1
and P2 back on Fan Proving switch.
No, continuity is not present: Confirm that burner is not firing at capacities or temperatures exceeding Inducer limits. Check for
excessive vent pipe runs, high winds, plugged / kinked Fan Prover sensing tube or a faulty Fan Prover switch. If everything checks
out okay, perform “PSA-1 Fan Proving Switch Adjustment” procedure again on page 11 or replace Fan Prover.
Yes, continuity present: Recheck wiring and burner control(s).
HOW TO OBTAIN SERVICE ASSISTANCE
1. If you have any questions about your UCRT Universal Control or if it requires adjustment or repair, we suggest that you con-
tact your installer, contractor or service agency.
2. If you require technical information contact Tjernlund Products, Inc. at 1-800-255-4208 with the following information.
1. Model of the Inducer that UCRT is interlocked with as shown on the label attached to Inducer.
2. Name and address of installer and any service agency who performed work on UCRT or Inducer.
3. Date of original installation and dates any service work was performed.
4. Details of the problem as you can best describe them.
LIMITED PARTS WARRANTY AND CLAIM PROCEDURE
Tjernlund Products, Inc. warrants the components of the UCRT for one year from date of installation. This warranty covers defects
in material and workmanship. This warranty does not cover normal maintenance, transportation or installation charges for replace-
ment parts or any other service calls or repairs. This warranty DOES NOT cover the complete UCRT if it is operative, except for
the defective part.
Tjernlund Products, Inc. will issue credit or provide a free part to replace one that becomes defective during the one year warranty
period. Proof of date of the installation in the form of the contractor sales/installation receipt is necessary to prove the unit has
been in service for under one year. All receipts should include the date code of the UCRT to ensure that the defective component
corresponds with the complete unit. This will help preclude possible credit refusal.
1.) Follow troubleshooting guide to determine defective component. If unable to determine faulty component, contact your
Tjernlund distributor or Tjernlund Technical Customer Service at 1-800-255-4208 for troubleshooting assistance.
2.) After the faulty component is determined, 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 than 1
year, you will need to provide a copy of the original installation receipt to your distributor. Credit or replacement will only be
issued to a Tjernlund distributor after the part has been returned prepaid to Tjernlund and verified defective.
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