White Rodgers 50A55-843 User manual

Whitev50A55-843
Universal
IntegratedFurnaceControl
INSTALLATIONINSTRUCTIONS
Rodgers
Operator:Save
theseins&rrctbnsfor future use!
FAILURE
TOREAD
ANDFOLLOW
ALLINSTRUCTIONSCAREFULLY
BEFORE
INSTALLING
OROPERATING
THIS
CONTROLCOULD
CAUSEPERSONAL
INJURY
AND/OR
PROPERTY
DAMAGE. DESGRIPTION
The
50A55-843is
anautomatic
gas
interrupted
ignition
control
thatemploys
a microprocessor
tocontinually
monitor,
analyze,
andcontrolthe
proper
operation
ofthe
gas
burner,
induu-er,
and
fan.
Signals
interpreted
duringcontinual
surveillance
ofthethermo-
statand
flame
sensing
elementinitiate
automaticignition
ofthe
bumer,
sensingoltheflame,
and
syslem
shut-off
dunngnormal
operation.
Ttresecontrolsincorporatesystem
faultanalysis forquickgas
flowshut-off,coupled
with
automatic
ignitionretryuponsensing
afaull correction.
TRANE
APPLICATION
- InstallerMUST
read
page
3 "Mounting
and
Wiring" PRECAUNONS
lnstallation
should be done by a qualified
heatingand air
conditioningcontractor
orlicensed
electrician.
lf in doubtaboutwhether yourwiringis millMofi,line,
or low
voltage,
haveitinspected
bya qualified
heating
andair
condi-
tioning
contractor
orlicensed
electrician.
Elonot exceed the spec-ificationratings.
Allwiringmust
contormtolocal
andnational
electricalcodes
and
ordinances.
This
controlisa precision
instrument,
andshould
be handled
carefully.
Rough
handling
ordistorting
components
could
cause
thecontrolto matfunction.
Followinginstallation
or replacement,
follow manufacturer's
recommendedinstallation/service
instructions
toensure
proper
operation.
CAUTION
Do not short out terminals on gas valve or primary
control. Short or incorrect wiring may damage the
thermostat.
AWARNING
)g v
Failure to comply with the following
wamings could resuh in personal injury
or property damage.
FIRE HAZARD
. Do not exceed the specified voltage.
. Protect the control from direct contact with water
(dripping,spraying,rain,etc.).
. lfthecontrol hasbeenindirectcontactwithwater.
replace
the control.
. Label
allwires beforedisconnectionwhen servic-
ing controls. Wiring errors can cause improper
and dangerousoperation.
. Routeandsecurewiring awayfrom flame.
SHOCK HAZARD
. Disconnectelectric powerbeforeservicing .
. Ensureproper earthgrounding of appliance.
. Ensureproper connection of line neutraland line
hotwires.
EXPLOSION HAZARD
. Shutoff maingasto applianceuntil installationis
complete.
+i
EMERSON.
Clinate Technologies
White-Rodgers
isadivision
ofEmersonElectric
Co.
www.white-rodgers.com
PARTNO.376265G
Replaces
37-6265F
0526

SPECIFICATIONS
ELECTRTCAL
RATTNGS
a@
77"F
(25.C)l:
InputVoltage:25VAC50/60Hz
Max.Input
Current
@25VAG:
0.45
amp
Relay
LoadRatings:
Valve
Relay: 1.5
amp @25VAC
50/60Hz0.6pf
lgnitor
Relay: 6.0amp
@120VAC
50/60Hz
(resistive)
lnducer
Relay: 2.2FLA-3.5
LRA
@120VAC
CirculatorRelay: 14.5FLA-25.0
LRA
@120
VAC
Flame
CurrentRequirements:
Minimum
currenttoinsureflame
detection:
1uaDC*
Maximum
currentfornon-detection:
0,1
paDC-
Maximum
allowable
leakageresistance:
100
Mohms
-Measured
with
a DCmicroammeter
in
theflame
orobe
lead
OPERATING
TEMPERATURE
RANGE:
-40'
to175'F
(-40"
to80"C)
HUMIDITY
RANGE:
5"/"to93y"relativehumidity (non-condensing)
MOUNTING:
Surfacemountmultipoise
Timing
Specs:
(@
60Hz..)
FlameEstablishing
Time: maximum
0.8sec
TIMINGSPECIFICANONS
(Alltimes
are
inseconds,unless
noted
otherwise)
50A55-843
PRE-PURGE 30
INITIALIGNITORWARM.UP
(1st
64attempts) 17
MINIMUMIGNITORWARM-
UP 5
MAXIMUM
IGNITORWARM-
UP 21
IGNITIONACTIVATION
PERIOD
TRIALFORIGNITION
PERIOD 4
RETRIES 2times
VALVE
SEQUENCE
PERIOD 12
INTERPURGE 60
POST.PURGE 15
LOCKOUTTIME 300
HEATDELAY-TO-FAN-ON- 30,45
HEAT
DELAY-TO-FAN-OFF- 60/90/
120/180
COOL
DELAY.TO.FAN-ON 5
COOLDELAY-TO-FAN-OFF' 45. 90
AUTORESET 60minutes
HUMIDIFIER YES
ELECTRONICAIR
CLEANER YES
-Thesetimeswillvarydependingon
option
switch
position.
Thecontrolis
factory-set
at30secondsheatdelay-
to-fan-on,
180secondsheatdelay-to-
fan-off
and
45secondscooldelay-to-
fan-off.
SeeOPERATIONsectionfor
furtherinformation.
FlameFailure
Response
Time: 2.0
sec
'- At50 Hz,alltiming
specifications
shouldbeincreased
by
20%
Gases Approved: Natural,Manufactured,Mixed, Liquified
Petroleum,
andLPGas AirMixturesareallapproved
foruse.

AWARNING
)E $,
FIRE
HAZARD
. Donot
exceed
thespecifiedvoltage.
. Replace
existing control with exact model and
dashnumber.
. Protect
thecontrolfromdirect
contact
withwater
(dripping,
spraying,rain,etc.).
. Label
all
wires
before
disconnectionwhen
servic-
ing controls.
Wiring
etrorscan cause
improper
anddangerous
operation.
. Routeandsecurewiringaway
fromflame.
SHOCKHAZARD
. Disconnect
electric
power
beforcservicing
.
. Ensure
proper
earth
grounding
ofappliance.
. Ensure
proper
connectionofline neutral
andline
hotwires.
EXPLOSIONHAZARD
. Shutoffmain
gas
toappliance
until
installatlon
is
complete.
INSTALLATION
CAUTION
Do not short out terminalson gas valveor primary
control.Shortor incorrect
wiring maydamage
the
thermostat.
MOUNTING
ANDWIRING
Allwldng
should
beinstalledaccording
to localandnational
electrlcaicodes
andordlnances.
The
confd mustbe
securedtoanareathat
willexperiencea
mlnlmumolvibration
andremalnbelow
themaximumambient
temperature
ratlngof175"F.Thecontrol
ls
approved
formlnl-
mum
amblent
temperatures
of
-40'F.
Whenmountlngthe control,
anyorientatlon
ls acceptable.
Choosealocatlonthat
wlllnot
damage,
obstruct
or
place
stress
on
the
control's
terminatlons,system
wiring
harnessorsystem
components.After
flndinga suitable
locatlon,drill
four
(4)
1ie"
holesformountlngcontrol.
Toensure
proper
mounting
hole
locauons,therelsa mountingholetemplateon
page
8of
this
instrucdon
sheet.
Detach
thepage
wlththetemplate
fromthe
instructlonsheetand
applyittothe
mountinglocatlon.
When
drillingtheholes,
take
care
so that
thetransformer,
wiring
hamess
orothersystem
components
are
not
damaged.
Four
(4)
#8
sheet
metal
screws
are
provided
tocomplete
theinstallation.
Refertothewirlngdiagram
and
wiringtablewhenconnecting
the
50A55control
toothercomponents
of
the
system.
ULapproved,
105"C
rated
18
gauge,
stranded,
zie."
thickinsula-
tionwlre ls recommended
for all bw voltage
satety
circuit
connections.
Referlo 50A55spe<ittcaton
sheel for re'cotn-
mendedterminals
tornatewifi fto€eon
thecontrol.
ULapproved
't05"C
rat€d16
gatqemh.,stmnded,
aie."
thlck
insulatonwtre
lsrecsnmenddfor all
llnevoltageconnectlons.
Referto
50A,45
spedficaton
sheet
forrecommendedterminals
tomate
wtththoseon
the
control.
fiftednstallatlon
or
replacement,
follow
appllance
manufacturer's
recommendedinstallationor service instructionsto ensure
proper
operation.
The50A45 hasonlyoneservlceaHe
parHn automotretlpe
fuse,whlch
protects
f|e bw r/oltage transformerfrom
damage
iflts
outputlsshort-clrculted.lfthefuse
has
openedup,
remove
whatevercausedtheshortclrcultand
replacethefusewlth
only
a3Ampautomotivetypefuse.lfthefusels
not
thecauseofthe
control's
problem,
replacethe
entlre50A55
control.Thereare
no
otheruserserviceable
parts.
Additional
jumper
wlresare included
in thispackage
and
shouldbeused
iftheorlginal
wirlng
does
notreachthe
control
after
mountlng.
Refer
to
the
furnacewiring
diagram
for
proper
connectionof
thewlres.
Amana/Goodmanapplication
-An
additlonal
wirlngharness
(WR
115-0223)is
includedinthis
package.
lfthecontrolbeing
replacedhas
a 2-pln
(inducer/ignitor)
connector,thiswiring
harnesswlll
adapt
thefurnacewlringtothe4-plnconnectorof
the
replacement
control.
Traneapplication
- Jumperwire151-2906
(provided
with
control)
mustbeinstalledonthe
furnacefromR01toR02ofthe
12-pin
connector.

TYPICAL
SYSTEM
WIRING
DIAGRAM
HOT
(LrNE)
50A55-843
inother
furnace(s)
TWINNING
APPLICATIONS
ONLY
TWIN*
(N.c.) LrMrr (N.
c.)
LEGEND
- l6w \,foltage(24vAC)
- Line
Voltage
(120
VAC)
N.C.= Normallyclosedswitch
N.O.= Normally
openswitch

F:
"4-
WPICAL SYSTEM WIRINGTABLE
*
Thetwinningfeature
isavailableonlyonmodels
withsixscrewterminals;oneof
theseterminals
willbe
designated'TWIN'.
All50A55-843
controls
used
intwinningapplications
musthavethe
'TWlN"
terminal.
t Maximumrecommendedflame
probe
wirelengthis
36
inches.
50A55 TERMINAL
TERMINAL I TYPE SYSTEMCOMPONENT
CONNECTION
W
G
R
Y
c
TWIN-
Terminal
blockwith
captive
screws
lowvoltage
thermostat
Wterminal
(or
equivalent)
lowvoltage
thermostatG
terminal
(or
equivalent)
lowvoltage
thermostatR
terminal
(or
equivalent)
lowvoltagethermostatYterminal
(or
equivalent)
(2nd
wire
fromYterminal
goes
to
24VACHOTsideof
compressorcontactorcoil)
24
VACCOMMONsideofcompressorcontactor
coil
one
wire
twinning
terminal
MV
(2
terminals)
TR
TH
RO1
RO2
FP
PS
HLI
HLO
GND
(unused
terminal)
12-pin
connector
&harness
gas
valve
(bothgas
solenoids
areconnected
in
parallel)
24VACtransformer
(low
voltageCOMMONside)
24VACtransformer
(low
voltageHIGHside)
rollout
switchOUTPUT
rollout
switch
INPUT
flame
sensor
probe*
pressure
switch
INPUT
highlimit
INPUT
highlimit
OUTPUT
MUSTBERELIABLY
GROUNDED
TO
CHASSIS
IND
IGN
INDN
IGNN
inducerHOT
side
ignitorHOT
side
inducerNEUTRAL
side
ignitorNEUTRAL
side
cooL spadeterminal circulatorblowerCOOLSPEEDterminal
HEAT spadeterminal circulatorblowerHEAT
SPEED
terminal
PARK
(2
terminals)
spade
terminal unusedcirculatorblowerterminals
LINE spade terminal inputvoltage
(120
VAC)HOT
side
XFMR spade terminal 24VACtransformerlinevoltageHOTside
EAC
(optional) spade
terminal electronicaircleanerHOTside
HUM
(optional) spade
terminal humidifier
HOTside
CIRNspade terminal circulatorblowerNEUTRALterminal
LINEN spade
terminal inputvoltage
(120
VAC)NEUTRALside
XFMRN spadeterminal 24VACtransformerlinevoltageNEUTRALside
EACN(optional) spadeterminal electronic
aircleaner
NEUTRAL
side
HUM
N(optional) spade
terminal humidifier
NEUTRALside

OPERATION
I
OPTION
SWITCHES
The opfion switches on the 50A55-84i] control are used to
determlnethe length
ofthecooldelay-to-fan-off,
heatdelay-to-
fan-on and heat delay-to-fan-off
periods.The followingtable
showsthe time periods
thatwill resultfrom the variousswitch
positions.
oPTroN
swtTcHPostTtoNs
COOLdelay-
to-fan-off: Set switch
#1
45
sec.*
90
sec. On
off
HEATdelay-
to-fan-off: Setswitch
u
#!
60sec.
90sec.
120
sec.
180
sec.*
On On
Off On
On Off
off off
*Factory
setting
HEATMODE
In a typixl system, a call for heat is initiatedby closingthe
thermostat contacts. This starts the 5OA55confol's heatng
sequence. The inducer blower and optional humidifier are
energized
andthe lgnitoris powered
withinonesecond.
Thiscontrollerhasanadaptive
algorithmthatadjuststhedura-
tion of the ignitorwarm-up,to extend ignitorlife. Upon initial
applicationof power, the warm-up time is 17 seconds.The
ignitor
on-timewillthen be increasedor decreaseddepending
onwhetherornotflameis
achieved.Thewarm-uptime
islimited
to a maxlmum of 21 seconds. During the first 64 warm-up
periods
following
power-up,
thewarm-uptimemay notbe less
than 17seconds.
Upon
acallforheat,ifthewarm-uptimehasnotbeenlocked,
il
willbedecreased
byonesecond.Thisreduction
oftheignitoron-
timewillcontinue
until
flamelailstobeachieved
(resulting
ina
retry).
lntheeventofaretry,
thewarm-uptime
willbeincreased
bytwo
secondsandlockedinatthatduration.
Once
thewarm-uptime
is locked,
it remainsfixeduntilanother
callfor heatresultsina
retry,inwhichcasethewarm-up
timeisagain increased
bytwo
seconds
and remains locked.
Intheeventoftwosuccessiveretry
attempts,thewarm-up
time
will
beunlockedand
set
to21seconds.lfflameisthen
achieved,
thewarm-uptimewillbegin
adaptingagainwiththenext
callfor
heat.lf, however,this third attemptfailsto achieveflame,the
controlwill go intosystemlockout.
At the endof the ignitor
warm-uptime, bothvalvesinthe 36E
manifold
gasvalveareopened.
Flamemustbedetectedwithin
4 seconds.
lfflameisdetected,thedelay-to-fan-on
period
begins.Afterthe
delay-to-fan-on
period
ends,the optionalelectronicaircleaner
isenergizedandthe circulator fan is energizedat heatspeed.
Whenthethermostatissatisfied, thegasvalveisde-energized.
After
proof
offlameloss,theheat
delay-tofan-offperiod begins
andtheinducer
blowerremainsenergizedto purge
thesystem
for15seconds.Whenthe
purge
is
complete,
theinducer
blower
and humidifierarede-energized.Afterthe delay-to-fan-off
pe-
riodends,the clrculator fan and electronicair cleanerare de-
energized.
lfflameisnot
detected,bothvalvesarede-energized,theignitor
is turned off, and the 50A55 control goes into the "ret4f se-
quence.
The
"retq/ sequence provides
aGG.second
waitfollow-
inganunsu@essful ignition
attempt
(flame
notdetected).After
thiswait,the ignitionsequenceisrestartedwithan additional2
seconds of ignitor warm-up time. lf this ignition attempt is
unsuccessful,one more retrywill be made beforethe control
goesintosystemlockout.
lfflameisdetected,thenlost,the50455 control willrepeat
the
initialignition
sequence
for a totalol four"recycles". Afterfour
unsuccessful
"recycle"
attempts,
the
control
will
gointo
system
lockout.
lf flame isestablished for moretlmn 10secondsafterignition,
the 50A55 controllerwrll dear the rgnitirn attempt (or retry)
countef.
lfflameislostafter'10
seconds,
rtwrllrestartthe
Onition
sequence. This can occur a maximum of five times before
systemlockout.
During bumer operation,a momentaryloss of power of 50
millisecondsor longer will de-energizethe main gas valve.
Whenpower isrestored,thegas
valvewlllremain
de-energized
anda restartofthe ignitionsequence
will beginimmediately.
A momentaryloss
of
gas
supply,
flame
blowout,orashortedor
open
conditionintheflame
probe
circuitwillbesensedwthin 2.0
secpnds. The gas valve will de'energlze and the confol wrll
restart
theignition
sequen@.
Recydeswill
@in andthebumer
will operate normally if the gas supply retums, or the fault
conditionis corrected,beforethe last ignitionattempt.Other-
wise,thecontrolwillgo intosystemlockout.
lfthecontrolhas
goneinto
system
lockout,
itmaybepossible to
reset the control by a momentarypower intenuption of one
second
or longer. Referto SYSTEMLOCKOUT FEATURES.
COOL
MODE
ln a typical system,a call for cool is initiatedby closing the
thermostatcontacts.Thisenergizes the50A55controlandthe
compressor.The cooldelay-to-fan-on
periodbegins.Afterthe
delay periodends, the optionalelectronic
air cleaneris ener-
gized,
and
thecirculatorfanisenergized
atcool speed.
Afterthe
thermostatissatisfied, thecompressorisde-energizedandthe
cool
mode
delay-to-fan-off
perlod
begins.Afterthedelay-to-fan-
off period ends, the circulatorfan and electronicair cleaner
(optional)
arede-energized.
MANUAL
FAN
ON
MODE
lf the thermostatfan switch is movedto the ON position,
the
circulatorfan
(cool
speed)andoptionalelectronicaircleanerare
energized.Whenthe fan switchis retumedto theAUTOposi-
tion,the circulatorfan and electronicair cleaner(optional)
are
de-energized.
HEATdelay-
to-fan-on: Setswitch
#2
30sec.-
45sec. On
off

TUUINNING
INTERFACE
lf the control has slx sct€w temanab, one d rlEt ls
doslgnatedTwlN, thecontroltsequtppedwt|ha shgb wtre
twlnnhg InteilaGe.lf mhnlng ls used,ellherqtd wtll
prooessa call for heat, cool or f,anas descrtod &ve.
However,
afterthe heat-,
cool-,orfan-ondelaytn: orplres,
both unlts vllll energlzethe ctrculatorblowsrsd OF same
Ume.Llkewlse,after lhe heat-,cooF,or land dolly Ume
explres,
both
untts
wlllde.energlze
theclrcUlatorbbrersat
thesarnetme. Thtsallowsforproper
atrflowtobeohhed.
Toassure
proper
control
opetatlon,bothcontob nnrst
sfrare
a oommon
translormer
grcund(IR).
ToenableMnnlng, dothefollowang.
1. Power
supplledtobothfumacesmustbelrornthesame
phase
oftheIncomlng
120VAC
power.
2- GonnecttheTWIN
screwtermtnals
onthe5OA5$8f3 of
thefumacesto betwhn€d to eachotheruslnga sftgle
wtrc
(14-2.AWG.).
SYSTETLOCKOUT
AND
DIAGNOSTIC
FEATURES
SYSTEMLOCKOT'T
FEATURES
When
rys'lem
lod<ortomrns,
the
gas
vahrclsdeeneetred, the
clrurlatorUmr ls eneqlzed at heatspeed,and,lf flarne
ts
sensed,thehducerblouverls
energlzed.Thediagnostc
indlca-
torltghtwlll
flashorglow
contnuoudytoIndacate
systemstatus.
(S1lsErrlo.*out uill neveroventdethe precautonary fiea-
tms.l
To rrset tfre confrol dbr sy'stumlocttout, do oned the
followlng:
1. Interuptthe
callforheat
orcoolatthethermostatforatleast
txle secondhn |ss tltan20seconds
(tfflamelssens€d
rrulthtte gasvahrc
deene€lzed, Intemlpdngthecaflbr
heatatthethermostat
wlllnot rcset thecontol).
2. hrem$the 24VAC
potrerdUte @ord brd leastone
second.Yormayaboneedto
resdttefiame rcllontseruior
surltcfi.
3. After
onehorrInlodout,lheconbolwlllautornatlcallyreset
nsef.
TtrEms5o[t hgoba
ttdl'||dtildasdlbe ma+
dEm|sonElecttco
DtAGNOSnb
relrunes
Tho
Cl^s+.iSagcontolconunuorsly
monllorslts
ownoperatql
andfp opedon ofthesystem.
!fafiallurcoccurc,theLED
wlll
lndcfr ail.re codeasshorn bebn lf$e fallurc b Inbrnal
to 0f cortol, the [gm wil stay on contnuorslyl. In this
ccr, Or onlfic contrcl should bercplaced,m the control
b ndlld<epdrabb.
It
tlp sensed
tatlur€lsInthe
system
(external
totheconbol),
the
LEDdnash anthebllotrlngflashaausesequencesto
Indlcate
fiafurB
stafrF(@ch
nashwllllastapgoxlmately0-25seoonds,
andedt pause
wllllastapgoxlmately2 seoonds).
1nash,lhenpause qptem lod<out
2flasfies,then
pause Prcssurcswltchstrckdosed
3nasfies,thenpause Prcssuresvlbfi stttd<open
4nastps,thenpause Openllmltsnitcfi
5flasfies,thenpause Open
rcllottsa,ltctl
Gflashes,thenpause 115Volt AC powerreversetUlrr
prcpergrwnd
7flaslrcqthenpause Lowflamesenseslgnal
Contnuorsflashlng Flamehasbeensensed
when
(nopause) nofiarnesftoddbepesrf (m
cafbrhd)
ThetED wlllahofrasfice e[pffi-rp.
7

MOUNTING
HOLE
TE]f,PLATE
ilOUNTING
HOLE
TEiIPLATE
FOR
TOUNNNGHOLE
LOGATTONS
{172tr.007
(2plcsJ
I
6.402
!.010
(2plcs")
Refiertopage3 of the installation instrlc{ions fiorproper installation.
't