Tjernlund DCOP1 Constant Operating Pressure Draft Control 8504174 (Discontinued) - Manual (Page 18)

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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 “Checking Memory for Last Fault Code” below.
LED INDICATOR LIGHTS
LED #1 (Amber) Appliance call for heat.
LED #2 (Blue)
Safety circuit through P1 & P2 (PSA-1 Fan Prover and/or Limit). Indicates PSA-1 switch 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 COP controller from MTR & N.
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 (Red) Flashes Continuously* = PSA-1 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 (Red) Flashes 2 Times PSA-1 Fan Prover was in electrically closed position prior to Inducer operation.
LED #4 (Red) Flashes 3 Times* PSA-1 Fan Prover does not close within 60 seconds after call for heat.
LED #4 (Red) Flashes 4 Times* PSA-1 Fan Prover opened during cycle and did not close within 10 minutes of Inducer operation.
LED #4 (Red) Flashes 5 Times* PSA-1 Fan Prover opened for more than 10 seconds during burner cycle but closed within 10 minutes.
* Investigate cause of PSA-1 Fan Prover short cycling such as; firing burner at capacities or temperatures exceeding Inducer
limits, excessive vent pipe runs, plugged / kinked Fan Prover sensing tube, PSA-1 Fan Prover setpoint too high or DCOP1 draft
setpoint too low. Adjustment may be required.
CHECKING MEMORY FOR LAST FAULT CODE
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 DCOP1 use caution when moving UC1 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 (Red) flashes. By moving any of the dip switches back to their original
position, the fault code will be cleared. NOTE: The DCOP1 must have its 115 VAC power supply present when any of the UC1
(1-8) dip switches are moved back to their original position for the fault code to clear.
SYMPTOM 1: INDUCER OPERATES CONTINUOUSLY
Verify the Inducer is not in post-purge mode which has been factory set for 2 minutes (Adjustable from 0 to 16 minutes). LED #4 &
#5 (Red) will flash in unison during post-purge. An Inducer pre-purge has been factory set for 5 seconds (Adjustable from 0 to 35
seconds) LED #4 & #5 (Red) will flash alternately during pre-purge. See “Pre / Post-Purge Settings” on page 3.
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: INDUCER MOTOR DOES NOT OPERATE
Verify that UC1 control has power, LED #6 (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 Inducer wiring to DCOP1.
Yes, LED #6 (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.
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.