White Rodgers Baby Carrier 50A62 820 User Manual

50A62-820  
Integrated Furnace Control  
WHITE-RODGERS  
INSTALLATION INSTRUCTIONS  
Operator: Save these instructions for future use!  
FAILURETOREADANDFOLLOWALLINSTRUCTIONSCAREFULLYBEFORE  
INSTALLING OR OPERATING THIS CONTROL COULD CAUSE PERSONAL  
INJURY AND/OR PROPERTY DAMAGE.  
DESCRIPTION  
The 50A62-820 is an automatic gas interrupted ignition  
control that employs a microprocessor to continually  
monitor, analyze, and control the proper operation of the  
gas burner, inducer, and fan.  
Signals interpreted during continual surveillance of the  
thermostat and flame sensing element initiate automatic  
ignition of the burner, sensing of the flame, and system  
shut-off during normal operation.  
Thesecontrolsincorporatesystemfaultanalysisforquick  
gas flow shut-off, coupled with automatic ignition retry  
upon sensing a fault correction.  
PRECAUTIONS  
CAUTION  
GENERAL PRECAUTION  
!
!
To prevent electrical shock and/or equipment  
damage, disconnect electric power to system at  
main fuse or circuit breaker box until installation  
is complete.  
Application of this type of control may cause  
flame rollout on initial start-up and could cause  
personal injury and/or property damage.  
Replace only with exact model number, includ-  
ing dash number. Failure to use exact replace-  
ment control could cause personal injury and/or  
property damage.  
Label all wires prior to disconnection when ser-  
vicing controls. Wiring errors can cause im-  
proper and dangerous operation.  
This control is not intended for use in locations  
where it may come in contact with water. Suit-  
able protection must be provided to shield the  
control from exposure to water (dripping, spray-  
ing, rain, etc.).  
Ifindoubtaboutwhetheryourwiringismillivolt,line,orlow  
voltage, have it inspected by a qualified heating and air  
conditioning contractor, or licensed electrician.  
Do not exceed the specification ratings.  
All wiring must conform to local and national electrical  
codes and ordinances.  
WARNING  
Do not use on circuits exceeding specified volt-  
age. Higher voltage will damage control and  
could cause shock or fire hazard.  
!
This control is a precision instrument, and should be  
handled carefully. Rough handling or distorting compo-  
nents could cause the control to malfunction.  
Do not short out terminals on gas valve or pri-  
marycontroltotest. Shortorincorrectwiringwill  
damage thermostat and could cause personal  
injury and/or property damage.  
CONTENTS  
Description ......................................................... 1  
Precautions ........................................................ 1  
Specifications..................................................... 2  
Installation.......................................................... 3  
Mounting & Wiring  
Operation ........................................................... 6  
WHITE-RODGERS  
EMERSON ELECTRIC CO.  
9797 REAVIS ROAD  
ST. LOUIS, MISSOURI 63123-5398  
PART NO. 37-6266A  
Printed in U.S.A.  
0119  
 
INSTALLATION  
MOUNTING AND WIRING  
WARNING  
NOTE  
Replace 50A62 control as a unit - no user serviceable  
!
parts.  
Do not use on circuits exceeding specified volt-  
age. Higher voltage will damage control and  
could cause shock or fire hazard.  
All wiring should be installed according to local and  
national electrical codes and ordinances.  
The 50A62 control may be mounted only in a control box  
of a Lennox furnace.  
The control must be secured to an area that will experi-  
ence a minimum of vibration and remain below the maxi-  
mum ambient temperature rating of 175°F. The control is  
approved for minimum ambient temperatures of -40°F.  
CAUTION  
!
To prevent electrical shock and/or equipment  
damage, disconnect electric power to system at  
main fuse or circuit breaker box until installation  
is complete.  
Any orientation is acceptable.  
Refer to the wiring diagram and wiring table when con-  
necting the 50A62 control to other components of the  
system.  
Failure to earth ground the appliance or revers-  
ingtheneutralandhotwireconnectiontotheline  
can cause shock hazard.  
UL approved, 105°C rated 18 gauge, stranded, 264” thick  
insulation wire is recommended for all low voltage safety  
circuit connections. Refer to 50A62 specification sheet  
for recommended terminals to mate with those on the  
control.  
UL approved 105°C rated 16 gauge min., stranded, 464”  
thick insulation wire is recommended for all line voltage  
connections. Refer to 50A62 specification sheet for  
recommended terminals to mate with those on the  
control.  
Shut off main gas to heating system until instal-  
lation is complete.  
Route and secure all wiring as far from flame  
as practical to prevent fire and/or equipment  
damage.  
After installation or replacement, follow appliance  
manufacturer’s recommended installation or service  
instructions to ensure proper operation.  
3
 
TYPICAL SYSTEM WIRING DIAGRAM  
HOT  
(LINE)  
NEUTRAL  
(LINE)  
120 VAC  
24 VAC CLASS II  
TRANSFORMER  
TH  
24 VAC  
50A62  
TR  
COOL  
HEAT  
FAN  
M1  
CIRCULATOR  
BLOWER  
M2  
LINE  
XFMR  
EAC  
HUM  
INDUCER  
IND  
IGN  
IGNITOR  
HUMIDIFIER  
GND  
GND  
CIR N  
LINE N  
XFMR N  
HUM N  
EAC N  
ELECTRONIC  
AIR CLEANER  
Y
W
G
R
C
Y
W
G
R
COMPRESSOR  
CONTACTOR  
THERMOSTAT  
FLAME  
SENSOR  
PROBE  
FP  
PRESSURE SWITCH  
(N. O.)  
PS  
PS  
HL  
HIGH LIMIT  
(N. C.)  
RO1  
GND  
RO2  
MV  
ROLLOUT  
(N. C.)  
GAS  
VALVE  
MV  
TR  
TH  
LEGEND  
Low Voltage (24 VAC)  
Line Voltage (120 VAC)  
N. C. = Normally closed switch  
N. O. = Normally open switch  
4
 
TYPICAL SYSTEM WIRING TABLE  
50A62  
TERMINAL  
TERMINAL  
SYSTEM COMPONENT  
CONNECTION  
TYPE  
W
G
R
Y
captive screw  
captive screw  
captive screw  
low voltage thermostat W terminal (or equivalent)  
low voltage thermostat G terminal (or equivalent)  
low voltage thermostat R terminal (or equivalent)  
low voltage thermostat Y terminal (or equivalent)  
2nd wire from Y terminal goes to 24 VAC HOT side of  
compressor contactor coil  
captive screw  
captive screw  
C
24 VAC COMMON side of compressor contactor coil  
gas valve (both gas solenoids are connected in parallel)  
rollout switch OUTPUT  
MV (2 terminals)  
RO1  
RO2  
rollout switch INPUT  
PS  
pressure switch INPUT  
9-pin  
connector  
& harness  
PS  
pressure switch OUTPUT  
GND  
MUST BE RELIABLY GROUNDED TO CHASSIS  
high limit switch input  
HL  
(unused terminal)  
IND  
inducer HOT side  
IGN  
ignitor HOT side  
6-pin  
GND  
connector  
& harness  
inducer NEUTRAL side  
ignitor NEUTRAL side  
GND  
(unused 2 terminals)  
COOL  
HEAT  
M1  
spade terminal circulator blower COOL SPEED terminal  
spade terminal circulator blower HEAT SPEED terminal  
spade terminal unused circulator blower terminal  
spade terminal unused circulator blower terminal  
spade terminal circulator blower FAN SPEED terminal  
spade terminal input voltage (120 VAC) HOT side  
spade terminal 24 VAC transformer line voltage HOT side  
spade terminal circulator blower NEUTRAL terminal  
spade terminal input voltage (120 VAC) NEUTRAL side  
spade terminal 24 VAC transformer line voltage NEUTRAL side  
spade terminal humidifier HOT side  
M2  
FAN  
LINE  
XFMR  
CIR N  
LINE N  
XFMR N  
HUM  
EAC (optional)  
HUM N  
EAC N (optional)  
TR  
spade terminal electronic air cleaner HOT side  
spade terminal humidifier NEUTRAL side  
spade terminal electronic air cleaner NEUTRAL side  
spade terminal 24 VAC transformer (low voltage COMMON side)  
spade terminal 24 VAC transformer (low voltage HIGH side)  
spade terminal flame sensor port*  
TH  
FP  
* maximum recommended flame probe wire length is 36 inches.  
5
 
OPERATION  
OPTION SWITCHES  
flameloss,theinducerblowerremainsenergizedtopurge  
the system for 5 seconds. When the purge is complete,  
Theoptionswitchesonthe50A62-820controlareusedto the inducer blower and humidifier are de-energized and  
determine the length of the heat delay-to-fan-off period. the delay-to-fan-off period begins. After the delay-to-fan-  
The following table shows the time periods that will result off period ends, the circulator fan and electronic air  
from the various switch positions.  
cleaner are de-energized.  
If flame is not detected, both valves are de-energized, the  
ignitor is turned off, and the 50A62 control goes into the  
“retry” sequence. The “retry” sequence provides a 15-  
second wait following an unsuccessful ignition attempt  
(flame not detected). After this wait, the ignition sequence  
is restarted. If this ignition attempt is unsuccessful, one  
more retry will be made before the control goes into  
system lockout.  
OPTION SWITCH POSITIONS  
HEAT delay-  
to-fan-off:  
Set switch  
#1  
#2  
180 sec.  
120 sec.  
90 sec.  
On  
On  
Off  
Off  
On  
Off  
On  
Off  
60 sec.*  
* Factory setting  
Ifflameisdetected,thenlost,the50A62controlwillrepeat  
the initial ignition sequence for a total of three “recycles”.  
After three unsuccessful “recycle” attempts, the control  
HEAT MODE  
In a typical system, a call for heat is initiated by closing the will go into system lockout.  
thermostat contacts. This starts the 50A62 control’s heat-  
If flame is established for more than 10 seconds after  
ing sequence. The inducer blower and humidifier are  
energized (if there is an optional electronic air cleaner on  
the system, the humidifier is not energized until the  
electronic air cleaner is energized). The 768A Silicon  
Nitride ignitor is powered within one second.  
ignition, the50A62controllerwillcleartheignitionattempt  
(or retry) counter. If flame is lost after 10 seconds, it will  
restart the ignition sequence. This can occur a maximum  
of five times before system lockout.  
Duringburneroperation, amomentarylossofpowerof50  
milliseconds or longer will de-energize the main gas  
valve. When power is restored, the gas valve will remain  
de-energized and a restart of the ignition sequence will  
begin immediately.  
This controller has an adaptive algorithm that reduces the  
ignitor temperature to slightly greater than the minimum  
temperature required to ignite gas in each particular  
application. The control measures the line voltage and  
determines an initial ignitor temperature setting based on  
the measurement. After each successful ignition, the  
control lowers the ignitor temperature slightly for the next  
ignition attempt. The control continues to lower the ignitor  
temperature until ignition does not occur, and the control  
goes into retry mode. For the second attempt to ignite gas  
within the same call for heat, the control increases the  
ignitor temperature to the value it was on the third previ-  
ous successful ignition. After ignition is successful, the  
control sets the ignition temperature at this value for the  
next 255 calls for heat, after which the control repeats the  
adaptive algorithm. The control is constantly making  
adjustments to the ignitor temperature to compensate for  
changes in the line voltage.  
A momentary loss of gas supply, flame blowout, or a  
shorted or open condition in the flame probe circuit will be  
sensed within 2 seconds. The gas valve will de-energize  
and the control will restart the ignition sequence. Re-  
cycleswillbeginandtheburnerwilloperatenormallyifthe  
gas supply returns, or the fault condition is corrected,  
before the last ignition attempt. Otherwise, the control will  
go into system lockout.  
If the control has gone into system lockout, it may be  
possible to reset the control by a momentary power  
interruption of one second or longer. Refer to PRECAU-  
TIONARY, SYSTEM LOCKOUT, AND DIAGNOSTIC  
FEATURES.  
The 80 VAC Silicon Nitride ignitor manufactured by  
White-Rodgers must be used. These ignitors are spe-  
cially designed to operate with the 50A62’s adaptive  
ignition routine to ensure the most efficient ignitor tem-  
perature.  
COOL MODE  
In a typical system, a call for cool is initiated by closing the  
thermostat contacts. This starts the 50A62 control’s cool-  
ing sequence. The compressor is energized and the cool  
mode delay-to-fan-on period begins. After the delay-to-  
fan-on period ends, the circulator fan is energized at cool  
speed. The electronic air cleaner (optional) is also ener-  
gized. After the thermostat is satisfied, the compressor is  
de-energized and the cool mode delay-to-fan-off period  
begins. After the delay-to-fan-off period ends, the circula-  
tor fan and electronic air cleaner (optional) are de-ener-  
gized.  
At the end of the ignitor warm-up time, both valves in the  
36E manifold gas valve are opened. Flame must be  
detected within 4 seconds.  
If flame is detected, the delay-to-fan-on period begins.  
After the delay-to-fan-on period ends, the circulator fan is  
energized at heat speed. If there is an optional electronic  
air cleaner on the system, the electronic air cleaner and  
the humidifier are energized. When the thermostat is  
satisfied, the gas valve is de-energized. After proof of  
6
 
SYSTEM LOCKOUT FEATURES  
MANUAL FAN ON MODE  
When system lockout occurs, the gas valve is de-ener-  
gized, the circulator blower is energized at heat speed,  
and, ifflameissensed, theinducerblowerisenergizedfor  
5 seconds. The diagnostic indicator light will flash or glow  
continuously to indicate system status. (System lockout  
will never override the precautionary features de-  
scribed above.)  
If the thermostat fan switch is moved to the ON position,  
the circulator fan (fan speed) and optional electronic air  
cleaner are energized. When the fan switch is returned to  
the AUTO position, the circulator fan and electronic air  
cleaner (optional) are de-energized.  
PRECAUTIONARY, SYSTEM  
LOCKOUT, AND DIAGNOSTIC  
FEATURES  
Toresetthecontrolaftersystemlockout, dooneofthe  
following:  
1. Interrupt the call for heat at the thermostat for at least  
one second (if flame is sensed with the gas valve de-  
energized, interrupting the call for heat at the thermo-  
stat will not reset the control).  
PRECAUTIONARY FEATURES  
The following precautionary features are built into the  
50A62 control.  
2. Interrupt the 24 VAC power at the control for at least  
one second. You may also need to reset the flame  
rollout sensor switch.  
1. If, at any time, the flame rollout sensor opens, the gas  
valve and ignitor are de-energized.  
3. Afteronehourinlockout,thecontrolwillautomatically  
reset itself.  
2. If, at any time, flame is sensed when the gas valve is  
de-energized, the heat circulator blower and inducer  
fan are energized and the ignition sequence will go  
into system lock out. The heat circulator and inducer  
will remain on as long as flame is detected. If flame  
is no longer detected, the inducer will turn off in 5  
seconds and the circulator will turn off using the  
maximum heat off delay.  
DIAGNOSTIC FEATURES  
The 50A62-820 control continuously monitors its own  
operation and the operation of the system. If a failure  
occurs, theDIAG1andDIAG2LEDswillindicateafailure  
code as shown below.  
3. If, at any time, the flame rollout switch opens, the heat  
circulator blower and inducer fan are energized and  
theignitionsequencewillgointosystemlockout. The  
inducer will remain energized for 5 seconds. The  
circulator will remain on as long as the flame rollout  
switch is detected open, then use the maximum heat  
off delay.  
SAFETY CIRCUIT  
Limit Control  
DIAG 1  
Slow Flash  
Off  
DIAG 2  
On  
Pressure Switch  
Slow Flash  
Watch Guard - Burners  
Failed to Ignite  
Alternate  
Slow Flash  
Alternate  
Slow Flash  
4. If at any time the main valve sense input does not  
correspond to the program’s requested gas valve  
state, the inducer is de-energized and the ignition  
sequence will go into system lock out. The heat  
circulator blower will be energized using the maxi-  
mum heat off delay, provided a heat off delay is  
already in progress.  
Flame Sensed Without  
Valve Energized  
Slow Flash  
Off  
Roll Out Open or 9-Pin  
Connector Disconnected  
On  
On  
Slow Flash  
On  
Bad Board  
Power On  
Simultaneous Simultaneous  
Slow Flash  
Slow Flash  
Fast Flash  
Slow Flash  
Slow Flash  
Slow Flash  
Low Flame  
Reverse Polarity  
Low Voltage or  
Ignitor Disconnected  
Alternate  
Fast Flash  
Alternate  
Fast Flash  
Simultaneous Simultaneous  
Fast Flash Fast Flash  
Heat Demand  
7
 
 

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