Carrier 50PG20-28 Controls, Start-Up, Operation, Service And Troubleshooting Instructions page 63

I I FLASH - INDOOR F/_ D_.AY I_ i MOC_FIED (HEA_NG)
I 2 _ - OPENING OF UMff
I 3 FLASHES - FLAME SENSOR
INDICATES _ Win-{
CLOSED GAS VALVE
4 _ - LIMFF SW_CH
CY_ 4 TIMES ON SINGLE
CALL FOR HEAT
I 5 FLASHES - IGNITK3N LOCKOUT (No _n_ va_n 15 nmu_)
I 6 FLASNES.INDUCEDDRA_ r
MOTORFAULT
8en_x tot 60 second)
I 7 FLASHES - OPESNING OF ROLLOUT SWITCH
I 8 _ - I-I/I_OWARE QR
SOFT_ FALLT
I 9 FLASHES'SOFTWARE _ LOCKOUT
_C BOARD
2. DEFEC]/VE 24V TRANS.
& _V_RE
4. NO PO_R_R TO UNIT
1
HEAllNG
I
I
I
'Wl' FROM BASE CONTROL BOARD ENERGIZES 'W'
ON IGC * 1 MINUTE LOCK-ON
COMBUSTION RELAY ON IGC B ENERG_ED
C_MPRESSOR &
OUTEX3(_R Fill MOTOR
START IMMEDIATELY
FOR INCO_ FAN
IMMEDIATELY
I
I
!
1 _ _ _ TU_ AT CO_ECT S_E_ (AT LE_T 2=0.P_, P_LL I
B=FECT 8_'¢SOR 8END_ _ SIGNAL TO 1ERM_¢N. 'J f ON IQC
IF LI_ S_ AND ROLLOUT
SWITCH ARE CLOSED, K_C
LOGIC _a_.L INITIATE tGNmON
SEQUENCE
4,
IGC SAFETY LOGIC OPENS GAS I
VhLVE FOR 5 SCE_ONOS
I
HIGH VOLTAGE I
1RANSFORMER CREATES A
10,000 VOLT SPARK FKTR 5
8_
I
I K3C _ LOGIC W1LL SHUT
OFF GAS VALVE AND SPARK
I 20 SECOND PURGE OF HEAT EXCHANGER I
Yes
I IGNfflON LOCYJDUT (_ R.t_HES OF LED) i
LEGEND
IDM -- Induced-Draft Motor
IGC -- Integrated Gas Unit Controller
NOTE: Thermostat Fan Switch in the
"AUTO" position.
Yes
HAS BEEN REDUCED D_E TO _ _VMTCH
TRIPe) _ WILL _ BLOV_R RB.AY
I
I
I
No
NORM.N. HEA_G O_f_A1X;_ I
i
HEA]ING _ SA'f}SFI_ I
!
IDM STOPS, SAFETY LO<_C SHUTS OFF GI,S VALVE I
SUBI_a£_r 5 _ (OR J
_NO1HB_ 5 S_CONDS) FROM
iNDOOR FAN ON TIME _ELAY
45 SE:OND BLOWER SHUTOFF DELAy
(DELAY EXTB_D_D BY 5 SECOI_)S FOR E/_3H LIMr£ S_I_H TRIP -
MAXIMUM DELAY: 3 MINUTES)
Fig. 12 -- IGC Service Analysis Logic
63