Tjernlund UCRT Rooftop Inducer Universal Control (Version X.06) 8504162 Rev A 05/11 - Manual (Page 14)

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the combustion air opening(s) into the equipment room as outlined in NFPA 31, 54 & 211. Tjernlund’s IN-FORCER TM combustion
air intake systems provide a convenient, automated way to supply combustion air to the equipment room. When installing the
Rooftop Inducer it is not necessary to supply any more combustion air than normally required when conventional venting.
UC1 UNIVERSAL CONTROL OPERATIONAL CHECK
1. Confirm power is supplied to the Control. LED #6 (RED) should be on.
2. Activate the UC1 by initiating an appliance call for heat. LED #1 (AMBER) should be on.
3. The motor relay will close and activate the Inducer motor. LED #3 (GREEN) should be on.
4. If the safety circuit across P1 & P2 (Inducer Prover) is closed, indicating an approved condition,
the appliance interlock relay will close making terminal #3 closed to terminal #4 & LED #2
(BLUE). Appliance burner should fire.
5. Remove power to the UC1 and any interlocked appliances. The LED #6 (RED) or any LED’s
should not be on. Test the safety circuit by removing the Blue or Yellow Lead from PSA-1 Fan
Proving Switch. Do not let the opened Lead touch a ground or damage may occur to the control
when power is Reestablished. Reestablish power to the UC1 and interlocked appliances and ini-
tiate a call for heat. After 60 seconds a Prover Start Up fault should arise with LED #4 flashing 3 times.
6. Remove appliance call for heat and power to the UC1 and any interlocked appliances. The LED
#6 (RED) or any LED’s should not be on. Reconnect Blue or Yellow Fan Prover lead to PSA-1
Fan Proving Switch terminal removed from in step 5.
7. Reestablish power to UC1 and interlocked appliances and initiate a call for heat to confirm proper
operation of UC1 and appliance.
RESETTING FAULT CODE CREATED BY STEP 5 OF OPERATIONAL CHECK
IMPORTANT: Prior to accessing the fault code memory, note the settings of the dip switches so that they can be returned to their
original Pre / Post-Purge positions. When power is supplied to the UC1 use caution when moving dip switches.
The last fault code can be retrieved at any time by setting all dip switches 1-8 to the up, or “on” position. The last fault code, or
lack there of, will be indicated by counting the number of times LED 4 flashes. By moving any of the dip switches back to their
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 code to clear.
TROUBLESHOOTING ELECTRICAL PROBLEMS
The following guide is intended to be used if a problem occurs during the use of the Inducer and UC1. It may be necessary to
measure voltage during troubleshooting. Extreme caution must be exercised to prevent injury. If you are unable to determine
the defective part with the use of this guide, call your Tjernlund distributor or Tjernlund Products direct at 1-800-255-4208 for fur-
ther 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”.
LED STATUS & FAULT INDICATORS
LED INDICATOR LIGHTS
LED #1 (Amber) Appliance call for heat.
LED #2 (Blue)
Safety circuit through P1 & P2 (Inducer Fan Prover and/or Limit). Indicates Inducer prover is closed
during run cycle. Burner circuit is energized with Interlock Relay contact closure from terminal 3 to 4.
LED #3 (Green) Power switched to Inducer motor from L to MTR & M.
LED #4 (Red)
Status / Fault indicator.
LED #5 (Red) Used as a status indicator.
LED #6 (Red) 115 VAC power supplied to board.
LED STATUS INDICATORS
LED #4 & #5 (Red) Flashing Alternately
= Inducer in Pre-purge. (Pre-Purge options 0, 5, 20, 35 seconds)
LED #4 & #5 (Red) Flashing in Unison = Inducer in Post-Purge.(Post-Purge options 0, 30 seconds or 1, 2, 4, 8, 16 minutes)
LED #4 Flashes Continuously* = Fan Prover opened for more than 10 seconds during burner cycle.
(Inducer will run for 10 minutes, attempting to close Fan Prover)
LED #5 (Red) Flashing Intermittently = With no call for heat, flashes 3 seconds on / 3 seconds off if microcontroller is
working properly.
LED FAULT INDICATORS
Fault conditions are indicated by counting the number of times LED #4 (Red) flashes.
LED #4 Flashes 2 Times Fan Prover was in electrically closed position prior to Inducer operation.
LED #4 Flashes 3 Times* Fan Prover does not close within 60 seconds after call for heat.
LED #4 Flashes 4 Times* Fan Prover opened during cycle and did not close within 10 minutes of Inducer operation.
LED #4 Flashes 5 Times* Fan Prover opened for more than 10 seconds during burner cycle but closed within 10 minutes.
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LED 1 AMBER
LED 2 BLUE
LED 3 GREEN
LED 4 RED
LED 5 RED
LED 6 RED
POWER LED
ON