Tjernlund HSJ, 1, 2 Series with UC1 Universal Control (Version X.04) 8504106 Rev B 05/03 - Manual (Page 19)

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MAINTENANCE
1. The HSJ,1,2 motors are permanently lubricated and do not need to be oiled.
2. The end-user must semiannually inspect the Vent Hood and vent pipe for blockage, corrosion and leaks.
3. A vent system inspection must be performed annually by a qualified service agency. The inspection should include the operation
circuit check, safety interlock test, combustion air test and a visual inspection of the complete vent system for corrosion, blockage or leaks.
Any corrosion, blockage or leaks detected must be repaired or replaced immediately.
TROUBLESHOOTING
The following guide is intended to be used if a problem occurs during the use of the Venter 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 at 1-800-255-4208 for further 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 5, “Checking Memory for Last Fault Code”.
LED STATUS & FAULT INDICATORS
LED INDICATOR LIGHTS
LED #1 (Amber)
Appliance call for heat.
LED #2 (Green) Safety circuit through P1 & P2 (Venter Fan Prover) is verified “Open” upon start-up. Indicates Venter prover is
closed during run cycle. Burner circuit is energized with contact closure from terminal 3 to 4.
LED #3 (Green) Power switched to Venter motor from L to MTR & M.
LED #4 (Red) Status / Fault indicator.
LED #5 (Red) 115 VAC power supplied to board. Also used as a status indicator.
LED STATUS INDICATORS
LED #4 & #5 (Red) Flashing Alternately = Venter in Pre-purge. (Pre-Purge options 0, 5, 20, 35 seconds)
LED #4 & #5 (Red) Flashing in Unison = Venter 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.
(Venter will run for 10 minutes, attempting to make Fan Prover)
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 venter 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 did not re-close after 10 minutes of Venter operation.
LED #4 Flashes 5 Times* Fan Prover opened for more than 10 seconds during burner cycle but closed within 10 minutes.
* Investigate causes of Fan Prover not making, i.e; Firing burner at capacities or temperatures exceeding Venter limits, excessive
vent pipe runs, elbows directly on venter discharge, high winds, plugged / kinked Fan Prover sensing tube or a faulty Fan Prover.
SYMPTOM 1: VENTER OPERATES CONTINUOUSLY
Verify that Venter is not in post-purge mode which could last up to 16 minutes. A factory post-purge has been set for 2 minutes. LED #4 & #5 (Red)
will flash in unison during post-purge. A Venter pre-purge could also be set for up to 35 seconds. LED #4 & #5 (Red) will flash alternately during pre-
purge. See “Pre / Post-Purge Settings” on page 5.
Verify that LED #1 (Amber) is not lit.
Yes, LED #1 (Amber) is lit: Check interlock wiring. Confirm burner control(s) are functioning properly. UC1 control is receiving constant call for heat
signal.
LED #1 (Amber) is not lit: Replace UC1 circuit board part number 950-8804.
SYMPTOM 2: VENTER MOTOR DOES NOT OPERATE
Verify that UC1 control has power, LED #5 (Red) should be lit. Verify that LED# 4 (Red) is not flashing. See “LED Status & Fault Indicators” above if
flashing. Verify RED voltage selection jumper corresponds with interlock voltage (i.e 24V, 115V or “Dry”).
No: Check circuit breaker, disconnect switches and wiring. Confirm that Venter motor leads are connected to N & MTR terminals.
Yes, LED #5 (Red) is lit: Verify that the interlocked burner is calling for heat, LED #1 (Amber) should be lit.
No, LED #1 (Amber) is not lit: Verify interlock wiring and that thermostat/aquastat is adjusted to call for heat. Verify that the RED
voltage selection jumper is installed so that it matches the voltage of the interlocked burner.
Yes, LED #1 (Amber) is lit: Verify Prover safety circuit fault does not exist. See, “LED Status & Fault Indicators” above.
If faults exist check Prover P1 & P2 safety circuit.
If no faults exist, check for 115 VAC across terminals N and MTR.
Voltage present: Confirm Black and White leads from UC1 whip are securely fastened to Venter motor leads. If so, replace Venter motor.
No voltage present: Replace UC1 circuit board part number 950-8804.
IMPORTANT: Fault codes will automatically be displayed after a fault condition occurs. If the call for heat interlock signal or 115 VAC
power is removed, the UC1 board will reset and the fault will be stored in memory instead of displayed. Any new fault will replace
any previous fault. See page 5, “Checking Memory for Last Fault Code”.