White Rodgers 50M56U-843 Manuel D’Utilisation

2

All  wiring  should  be  installed  by  a  qualified  heating  and  air 
conditioning  contractor  or  licensed  electrician,  according  to 
local and national electrical codes and ordinances.
The control must be secured to an area that will experience a
minimum of vibration and remain below the maximum ambient
temperature  rating  of  176°F.  The  control  is  approved  for
minimum ambient temperatures of -40°F.
When  mounting  the  control,  any  orientation  is  acceptable. 
Choose  a  location  that  will  not  damage,  obstruct  or  place 
stress on the control’s terminations, system wiring harness or 
system components. After finding a suitable location, drill four 
(4) 1/8” holes for mounting control. To ensure proper mounting
hole  locations,  use  the  control  as  a  template.  When  drilling 
the holes, take care so that the transformer, wiring harness or 
other system components are not damaged. Four (4) #8 sheet 
metal screws are provided to complete the installation. 
Refer to the wiring diagram and wiring table when connecting 
the 50M56U-843 control to other components of the system.
UL  approved,  105°C  rated  18  gauge,  stranded,  2/64”  thick
insulation wire is recommended for all low voltage safety circuit 
connections. 
UL  approved  105°C  rated  16  gauge  min.,  stranded,  4/64”
thick  insulation  wire  is  recommended  for  all  line  voltage 
connections. 
After installation or replacement, follow appliance manufacturer’s 
recommended  installation  or  service  instructions  to  ensure 
proper operation.

Input Voltage: 25 VAC 50/60 Hz
Max. Input Current @ 25 VAC: 0.45 amp

Relay Load Ratings:
Valve Relay:  1.5 amp @ 25 VAC 50/60 Hz 0.6 pf
Ignitor Relay: 6.0 amp @ 120 VAC 50/60 Hz (resistive)
Inducer Relay: 2.2 FLA–3.5 LRA @ 120 VAC
Circulator Relay: 14.5 FLA–25.0 LRA @ 120 VAC

Minimum current to insure flame detection: 1 µa DC*
Maximum current for non-detection: 0.1 µa DC*
Maximum allowable leakage resistance: 100 M ohms

*Measured with a DC microammeter in the flame probe lead
OPERATING TEMPERATURE RANGE:

-40° to 176°F (-40° to 80°C)

Surface mount multipoise

Timing Specs: (@ 60 Hz)
 

Flame Establishing Time: 

0.8 sec

Flame Failure Response Time:

2.0 sec

Gases Approved: Natural, Manufactured, Mixed, Liquified
Petroleum, and LP Gas Air Mixtures are all approved for use.

(All times are in seconds, unless noted otherwise

50M56U-843

Pre-Purge

30

Initial Ignitor Warm-Up
(1st 64 attempts)

17

Maximum Ignitor Warm-Up

19

Ignition Activation Period

2

Trial for Ignition Period

4

Retries

2

Recycles

3

Valve Sequence Period

12

Interpurge

60

Post-Purge

25

Lockout Time

275

Heat Delay-To-Fan-On

30

Heat Delay-To-Fan-Off

100/150*

Cool Delay-To-Fan-On

6

Cool Delay-To-Fan-Off

45

Auto Reset

60 minutes

*These times will vary depending on option switch

position. See OPERATION section for further infor-
mation.