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When replacing
To Configure Control:
1. Determine the configuration and timings for
the control being replaced. Can be found from
manufacturer literature or label on control.
2. Use White-Rodgers Connect OR 7-segment LED
and follow Table 1 to select proper settings.
Wires from 50D50U-843
11-pin harness
MV
MV/PV COM
PV
BRN GND
24V
PSW
24V COM
TH-W
C/GND
R
Other Setup Notes:
•
If control being replaced does not have a terminal shown in the diagram above, leave that wire in the
50D50U-843 11-pin harness unconnected and insulated to prevent possibility of a short-circuit
For example, the 35-60 DSI series does not have 24VAC/R, so leave the 24V wire on 50D50U-843
○
un-used when replacing any control in the 35-60 DSI series
•
Follow all safety guidelines on page 1 and directions under MOUNTING AND WIRING DIAGRAM on page 4
Sequence of operation when
CONFIGURABLE
STANDBY
TRIAL FOR
IGNITION (TFI)
IF CONFIGURED,
INDUCER TURNS OFF
IF CONFIGURED,
BEGIN
POST-PURGE
6
Fenwal 35-60 or 35-61 – Direct Spark Ignition (DSI)
Factory unit wires removed
from replaced control
SENSE terminal
on 50D50U-843
50D50U-843
PSW OPEN FAULT
NO
YES
IS PRESSURE
INDUCER IS
SWITCH OPEN?
ENERGIZED
CALL FOR HEAT
MODULE
RECEIVED FROM
PERFORMS
THERMOSTAT
SELF CHECK
SPARK
OPEN MAIN
ON
GAS VALVE
SPARK
RUN
OFF
YES
CLOSE MAIN
GAS VALVE
RAJAH (or spade)
spark terminal on
50D50U-843
Existing Control Being Replaced
S1 V2
GND
L1 terminal on 50D50U-843
IND terminal on 50D50U-843
ALARM terminal on 50D50U-843
is Configured to Replace
PSW STUCK CLOSED FAULT
YES
NO
IS PRESSURE
SWITCH CLOSED?
YES
NO
IS PRESSURE
SWITCH
CONFIGURED?
BEGIN INTER-PURGE
NO
CLOSE GAS
FLAME
VALVE,
PROVEN?
SPARK OFF
YES
NO
CALL FOR
HEAT ENDS?
YES
CONTROL IS
NO
IS 24V TERMINAL
POWERED FROM
CONNECTED?
TH-W OR PSW
NC V1/
PSW TH/
24VAC/
L1
IND
P1
R
35-60 or 35-61:
AUTO RESTART DELAY
IF CONFIGURED
INDUCER TURNS OFF
BEGIN
NO
PRE-PURGE
IS INTER-
PURGE
YES
CONFIGURED?
NO
YES
BEGIN
COMPLETE
FINAL TFI
POST-
ATTEMPT?
PURGE
NO
YES
CLOSE MAIN
FLAME
GAS VALVE
LOST?
GAS VALVE CLOSES
AS CONTROL
POWERS OFF
TS
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