Tjernlund DCOP1 Constant Operating Pressure Draft Control 8504174 (Discontinued) - Manual (Page 4)

UC1 LED STATUS & FAULT INDICATORS
NDICATORS
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.
UC1 PRE / POST PURGE AND PROVER STATUS CHECK DIP SWITCH SETTINGS
Remove power to DCOP1 and heating equipment when installing, servicing or changing UC1 dip switch settings. Failure to do so
may result in personal injury and/or equipment damage. LED #6 (RED) should not be on if 115 VAC supply power is removed from
the control.
Pre-purge
An Inducer pre-purge has been factory set at 5 seconds (Adjustable from 0 to 35 seconds). Used
for longer vent runs to get draft fully established throughout the vent system prior to burner ignition.
Also beneficial for negative pressure prone environments. IMPORTANT: Nuisance equipment lock-
outs may occur if Inducer pre-purge is running in conjunction with and is longer than any equipment
timing circuit. Pre-purge settings must be shorter than burner control lockout time unless wired prior
to burner control timing circuit (i.e. aquastat / thermostat).
Post-purge
An Inducer post-purge has been factory set at 2 minutes (Adjustable from 0 to 16 minutes). Confirm
that dip switch #5 is in the up or "on" position. Oil fired equipment requires that the post-purge be
long enough to eliminate post cycle nozzle drip odor. A longer post-purge may be necessary for
longer vent runs or high heat retention, refractory lined combustion chambers. A shorter post-purge
may be desired for gas installations.
UC1 INSTALLATION
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.
3
1 9
LED 1 AMBER
LED 2 BLUE
LED 3 GREEN
LED 4 RED
LED 5 RED
LED 6 RED
POWER LED
ON