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Servicing should only be performed by a Qualied Service Technician
UGB – BLOWER SPEED CONTROL
The BCL 120 thru 250(A) models are equipped with a UGB PWM output control board for blower speed
control. When the UGB J5.6 is energized by T-stat Call-for-heat, the UGB will provide 90% duty cycle PWM
signal to the blower for 20 seconds prepurge, then provide a PWM control signal per SW2 dipswitch setting
for igntion speed. After the flame is confirmed and the UGB J5.3 is energized by the main gas control of the
igntion module, the UGB will provide a high blower speed control per SW4 dipswitch setting. For the detailed
SW2 and SW4 dipswitch settings of different BCL models, see the dipswitch table listed in this page.
PART NO. SW2 SW4 USED FOR
323859-000 7 2 BCL381T1206NOX
323859-001 8 B BCL381T1546NOX
323859-002 6 A BCL395T1806NOX
323859-003 3 3 BCL395T1996NOX
323859-004 3 8 (A)BCL395T2506NOX
PIN CONNECTIONS
J5
PIN NUMBER DESCRIPTION
J5.5 24VAC H
J5.1 24VAC N
J5.6 ENABLE
J5.3 HIGH FIRE
J5.2, 5.4, 5.7, 5.8 NOT USED
J6
J6.1 24VDC H
J6.2 24VDC RTN
J6.3 NOT USED
J6.4 PWM OUTPUT
J6
J5
SW4
SW2