Tjernlund UC1 Universal Control (Version X.06) 8504107 Rev D 07/05 User Manual
Page 15
OPERATION AND DRAFT CHECK
The installer must perform Draft Check, Safety Interlock and Combustion Air Test as outlined in the Venter installation manual. If
Venter installation manual is not present use the following procedure below.
The Fan Proving Switch is designed to disable the appliance gas valve or
burner motor upon Venter failure only! It is not designed and cannot replace,
regular vent system inspection, appliance servicing and combustion testing.
1. Close all doors and windows of the building. If the appliance is installed in a
utility room or closet, close the entrance door to this room. Close fireplace
dampers.
2. Turn on clothes dryer and all exhaust fans such as range hoods, bathroom
exhausts and whole house fans to maximum speeds. Do not operate a fan
used strictly for Summer exhausting.
3. Following the appliance manufacturer’s instructions, place the appliance in
operation, set thermostat for continuous operation.
4. Verify that Venter operates first, prior to burner ignition. Watch to make sure burner lights off properly.
GAS
After allowing appliance(s) to operate for 15 minutes, follow the appliance manufacturers instructions to verify that the recom-
mended draft is present. In general, most gas appliances will operate safely with flue outlet draft levels from -0.02 to -0.05" W.C..
If the draft is excessive, make necessary adjustments to the barometric control and/or follow the, “Venter Air Flow Damper
Adjustment” procedure outlined in Venter installation manual. As a cross check, a candle or match can be held adjacent to the
draft hood or barometric control to verify flame/smoke is being drawn into, and not rolling out of edge of the relief opening, (See
Diagram above). If exhaust gases are escaping from the relief opening of the draft hood or barometric control, the equipment
should not be operated until proper adjustments or repairs are made to provide adequate draft levels.
OIL
After allowing equipment to operate for 15 minutes, make necessary adjustments to the primary air intake and barometric draft
control to comply with the manufacturer recommended over-fire draft and CO
2
requirements of the burner. In most cases, the
over-fire draft should be in a range of -.02” to -.04” W.C. If adjustments to the primary air intake and barometric draft control do not
provide the required over-fire draft, the Venter draft adjustment must be repositioned accordingly. Measure over-fire draft and CO
2
after repositioning Venter draft adjustment. Follow the “Venter Air Flow Damper Adjustment” procedure outlined in Venter installa-
tion manual.
5. Next, turn on all other fuel-burning appliances within the same room so they will operate at their full input. Repeat Step 3 above,
checking the draft on each appliance.
TROUBLESHOOTING ELECTRICAL PROBLEMS
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: 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 (Venter Fan Prover and/or Limit). Indicates Venter 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 Venter 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
= 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 #5 (Red) Flashing Intermittently
= With no call for heat, flashes 3 seconds on / 3 seconds off if microcontroller is
working properly.
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PROPER
DRAFT
ESTABLISHED
PROPER
DRAFT
ESTABLISHED