Tjernlund HS3,4,5 Series with UC1 Universal Control (Version X.02) 8504111 Rev 09/02 - Manual (Page 15)

MAINTENANCE
1. Oil every six months with 2 drops of S.A.E #20. The oil ports are located at both ends of the motor.
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 mea-
sure 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 further assistance.
IMPORTANT: To reset faults, verify fault by checking the LEDs and then remove call for heat.
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. Burner circuit is energized
with contact closure from terminal 3 to 4. Also verifies Venter prover is closed during run cycle.
LED #3 (Green) Power switched to Venter motor from L to MTR & M.
LED #4 (Red)
Status indicator.
LED #5 (Red) 115 VAC power supplied to board. Also used as status indicator.
LED INDICATOR LIGHT STATUS & FAULTS
LED #4 & #5 Flashing Alternately
= Prover start up fault. Venter Prover contacts “Closed” across P1 & P2 upon appliance call
before Venter is turned on. Prover status check must be activated, see page 5.
LED #4 & #5 Flashing in Unison = Fan Prover circuit is “Open” longer than 60 seconds on start-up or 10 seconds during run
cycle. Venter Prover contacts are not staying “Closed” across P1 & P2 safety circuit.
LED #4 Flashing & #5 on Continuous = System in Pre-Purge. (Pre-Purge options 0, 15, 30, 60 seconds)
LED #5 Flashing & #4 on Continuous = System in Post-Purge. (Post-Purge options 0, 30 seconds or 1, 2, 4, 8, 16 minutes)
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 (Red) will be on continuously and LED #5 will be flashing during post-purge. A Venter pre-purge could also be set for up to 1
minute. LED #4 (Red) will be flashing and LED #5 will be on continuously during a Venter 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. UC1 control is receiving constant call for heat signal.
LED #1 (Amber) is not lit: Replace UC1 circuit board part number (HS3 & HS4 950-8801) (HS5 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) or LED# 5 (Red) are not flashing. See “LED
Status & Fault Indicators”, above. Make sure RED voltage selection jumper is positioned according to appliance interlock voltage.
No: Check circuit breaker, disconnect switches and wiring. Confirm that 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 motor leads in Fan Prover electrical box. If
so, replace Venter motor.
No voltage present: Replace UC1 circuit board part number (HS3 & HS4 950-8801) (HS5 950-8804).
SYMPTOM 3: VENTER OPERATES, BUT BURNER DOES NOT
NOTE: Prover status check must be activated when side wall venting, see page 5. Venter may be in Pre-purge mode for up to 1
minute before burner fires, See “Pre / Post-purge settings”. IMPORTANT: Venter pre-purge time, if selected, must be shorter than
flame sensor lockout time. For any newly established call for heat the UC1 will run for 60 seconds to try to close the fan prover circuit
(P1 to P2). If circuit can not be made after 60 seconds LED's 4 & 5 (Red) will flash in unison, indicating a prover check circuit fault on
UC1 start up. The UC1 will shut down and LED's 4 & 5 (Red) will flash in unison, indicating a prover check circuit fault on UC1 start
up. NOTE: If flame sensor of burner locks out during the 1 minute period the UC1 safety circuit and LED’s 4 & 5 will be reset. If the
fan prover makes on start up, but breaks for more than 10 seconds during the burner cycle, LED's 4 & 5 (Red) will flash in unison
indicating a prover circuit fault. The UC1 will continue to run for 10 minutes to try to make the prover circuit as long as a call for heat
exists. After 10 minutes the UC1 will shut down and LED's 4 & 5 (Red) will flash in unison indicating a prover circuit fault. Remove
the call for heat and then reestablish to reset the UC1 prover safety circuit (P1 to P2) & LED’s.
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