I I F_ - _ FAN DELAY I._MODPlED (HEAT_3)
r-
I 2 FLUS - OPENk'qG OF UMIT
IN[_.,ATES _ _
CLOSED GAS VALVE
CYCLED 4 TIMES ON SINGLE
CALL FOR HEAT
(No i_aon wL_ 15 m/_ee)
/
6 FLASHES - INDUCED DRAFT /
MOTOf_ FALILT
(No _gnal from the H_J Em_ct
Sensor for eO seoor_)
7 FLASHES - _ OF _I--ROLLOUT SWITCH
8 FLASHES - _ OR
SOFTWARE FAULT
9 FLASHES - SOFTWARELOCKOUT
COMPRESSOR & I
_ F/_I MOTOR
ST,,a_q" _TELY
I 1 SECOND ON I_LAY I
FOR INDOOR FAN
t
i _ AND I
_ F_ s'r_ I
IMME,OIATELY I
,
I I
FOR ff4l:X:X_ FAN
I
I IGC SAFETY LOGIC WILL SHUT
OFF GAS VALVE AND SPARK
4,
EXCHANGER
Yes
1' ,
I _n'_4 LC_,_cxrr t
LEGEND
IDM -- Induced-Draft Motor
IGC -- Integrated Gas Unit Controller
NOTE: Thermostat Fan Switch in the
"AUTO" position,
ON
I
I
I
1
HEATING
t
'Wf FROM BASE CONTROL BOARD ENERGIZES 'W'
ON IGC - 1 MINUTE LOCK-ON
RELAY ON IGC 18 ENERGIZED
1. BLOWN 5 _P FUSE
2. DEFECTIVE 24V TRANS.
& BROKEN '€_tRE
4. NO _ TO UNIT
I COMBUSTION RELAY B_=RGI_-'_ INDUCED DRAFT MOTOR (IOM)
TEP_INAL 'Cl_ ON
t
I IF IDM iS TURNING AT CORRECT SPEED (AT L_ 2400 RPM), HN_
EFFECT SENSOR SENDS CORRECI" SIGNAL TO TERMINAL 'Jl' ON K31C
I
IF UMIT SWITCH/kND ROLLOUT
SWITCH ARE CLOSED, IGC SAFETY
LOGIC V_LL INMATE IGNmON
SEQUENCE
4, 4,
_ CRF__I_S A
10,000 VOLT SPARK FOR 5
SECONDS
I
Yes
HAS BEEN REDUCED DUE TO LIMIT,S%"_TI'(:TrlI
TRIPS) _ "WILL_E BLOWIER RELAY I
IGC SAFETY LOGIC OPENS GAS
VhLVE FOR 5 SECONDS
I
No
I HEATI__ =T_ED I
I E)M STOPS, SPFETY LOGIC SHUTS OFF _ V/_.VE I
, '
45 SECOND BLOW_ _LrrOFF DELAY }
(DBLAY EXTENDED BY 5 SECONDS FOR EACH LIMIT SW_TCH TRP -
MAXIMUM DELAY: 3 MINUTES)
_ 5 SECONOS(OR
ANOTHER5 SECONDS)FROM
INDOORFANONTIMEDELAY
Fig. 14 -- IGC Service Analysis Logic
81
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