White Rodgers 50T35-743 - Manual (Page 4)

4
INSTALLATION
SELECTING THE BLOWER OFF DELAY
In the heating mode, the blower off delay can be selected
to obtain a 90, 120 or 150 seconds period. This can be
accomplished by changing the position of a plastic jumper
located on the ignition control. See the drawing below for
the location of this jumper.
The control is factory set to give a (150) second blower off
delay. See drawing below for the jumper position for all
available settings:
Notes:
• If the jumper is removed, the control will default to a
(150) second blower off delay in the heating mode.
• The blower on time in the heating mode is (30)
seconds and is non-adjustable.
• The blower on time in the cooling mode is (5) seconds
and is non-adjustable.
• The blower off delay in the cooling mode is (60)
seconds and is non-adjustable.
• Caution is to be exercised not to bend the metal pins
when changing the time delay from the factory setting.
DIAGNOSTIC FEATURES
The 50T35-743 control continuously monitors its own
operation and the operation of the system. If a fault occurs,
the LED will indicate a fault code as shown below. If the
fault is internal to the control, the light will stay off. In
this case, the entire control should be replaced, as the
control is not field-repairable.
If the sensed failure is in the system (external to the
control), the LED will flash in the following flash-pause
sequences to indicate failure status (each flash will last
approximately 0.25 seconds, and each pause will last
approximately 2 seconds).
Monitored
LED Condition During Action
Solid On Normal All Times None required
1 Flash Ignition retries Heating Gas Valve “Off”
exceeded Demand Circulator
“Delay Off”
Inducer “Off”
2 Flashes PSW Stuck Heating All Outputs
Closed Demand “Off” except circ
Only cool speed in
response to a
call for fan/cool
3 Flashes PSW Stuck Heating All Outputs
Open Demand “Off” except circ
Only cool speed in
response to a
call for fan/cool
4 Flashes Limit Switch Heating Gas Valve “Off”
Open Demand Circulator “On”
Only Inducer “On”
5 Flashes Improper All Times Gas Valve “Off”
Flame Circulator “On”
Inducer “On”
Rapid Improper Power-up Gas Valve “Off”
Flashing Polarity Circulator “Off”
Inducer “Off”
Twinning All other Gas Valve “Off”
Fault times Circulator “Off”
Inducer “Off”
Off Internal error All Times Gas Valve “Off”
detected Circulator “Off”
Inducer “Off”
BLOWER
TIME OFF
JUMPER
90
120
150
STATUS
TWIN
W
G
R
STATUS
90
120
150
90
120
150
90
120
150
JUMPER SET
STATUS
JUMPER SET
STATUS
JUMPER SET
FOR 90 SEC. FOR 120 SEC. FOR 150 SEC.