IMPORTANT!!! UC1 BOARD VERSION X.06 UPDATES
LED INDICATOR LIGHTS
LED #1 (Amber) Appliance call for heat.
LED #2 (Blue)
Safety circuit through P1 & P2 (Venter Fan Prover and/or High 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.
P/N: 8505017
©2005 TJERNLUND PRODUCTS, INC. ALL RIGHTS RESERVED
REV. B 07/05
TJERNLUND PRODUCTS, INC.
1601 Ninth Street • White Bear Lake, MN 55110-6794
PHONE (800) 255-4208 • (651) 426-2993 • FAX (651) 426-9547
Visit our web site • www.tjernlund.com
IMPORTANT:
For 950-8804 UC1 Replacement Board Kits:
If this is a 950-8804 UC1 board kit and you are replacing an existing UC1 board with this
new board, note Dip Switch settings on existing UC1 circuit board so that those same settings can be positioned on this replacement circuit
board. NOTE: Adhere appropriate included label over existing label in UC1 or SideShot electrical box. Also adhere "Checking Memory for
Last Fault Code" sticker on inside of UC1 or SideShot SS1 Series electrical box. On SS2 Series adhere to underside of electrical box.
For SideShot Series SS1 Models:
The Pre-Cycle Prover Status Check is deactivated from the factory on the SS1 Series. Because of the
low set point of the SS1 Fan Prover (as low as .03" w.c.) cross winds may cause the Fan Prover to close prior to a call for heat. Activating the
Prover Status Check on the SS1 may cause nuisance lockouts.
Important:
Deactivate the Pre-Cycle Prover status check if installing this board
on a new or existing SS1 installation by pushing the #9 dip switch up or “ON” to disable.
For Draft Inducers with the UC1:
Natural draft or winds may be sufficient to close the fan prover switch contacts prior to a call for heat
when using the PS1505 fan prover with a draft inducer. Keeping the Pre-Cycle Prover Status Check activated may cause nuisance lockouts.
Important:
Deactivate the Pre-Cycle Prover status check if installing this board on a new or existing draft inducer installation by pushing the #9
dip switch up or “ON” to disable.
IMPORTANT:
This upgraded circuit board features:
A new #6 power LED
Constant red when 115 VAC is supplied to L & N.
A new color for the #2 LED
Constant blue when fan prover safety circuit is closed.
A revised #5 LED
With no call for heat present, flashes 3 seconds on /
3 seconds off if microcontroller is working properly.
LED # 2 now BLUE
(previously GREEN)
New LED # 6 RED
115V power supplied
to UC1 L & N terminals
LED # 5 RED With no
call for heat, flashes 3
seconds on / 3 seconds
off if microcontroller is
working properly.
NEW X.06 VERSION UC1 BOARD FEATURES
LED 1 (AMBER)
LED 2 (BLUE)
LED 3 (GREEN)
LED 4 (RED)
LED 5 (RED)
LED 6 (RED) POWER LED
DRY
24 V
115 V
APPLIANCE
INTERLOCK
RELAY
VENTER
MOTOR
RELAY
A B 1 2 3 4 L N
J1 J2 XL XN
P1 P2 C GND F
(1 9)
N M MTR
