Rheem RGFE User Manual

88
FIGURE 82
TROUBLESHOOTING CHART – CONTINUED
MODULATING INTEGRATED
FURNACE CONTROL (IFC)
TROUBLESHOOTING GUIDE
ECM = Constant CFM Blowers. (Electronically commutated motor)
TSTAT = Thermostat.
IDM = Induced Draft Motor (or Inducer).
IFC = Integrated Furnace Control (or control board).
PS = Pressure Switch(es).
PFC = Power Factor Correction Choke.
SE = Spark Electrode (s).
SSD = Seven Segment Display of Furnace control
COMM. = Communication.
I&O = Instal
lation & Operation Instructions Manual.
1) Set DIP switches SW2-2 to “OFF” and SW2-3 to
“ON” for test mode - high fire.
2) Set FAN switch to “AUTO” on T-stat.
3) Set thermostat to call for heat (set temp.
differential to greater than 10°F).
4) “H” should be displayed at “SSD’s” and should
Be on steady, if flashing check dip switches
(Item “1”).
For Non-Comm. Systems.
“A capital
is displayed at IFC SSD’S”
Dual SSD’S “ON”
92-22744-23-00
Is thermostat heat call present?
For 24 VAC (Non-Comm. T-stat., is 24 VAC on W1 and/or W2 of
IFC. H or h should be displayed at SSD’S.
Is a fault code displayed at IFC?
(After 10 Sec. a fault code will display anyway)
H or h only
For 1st 10 Sec. only
FAULT
Under ”Troubleshooting”
in I & O Manual
Is a modulating
T-stat connected?
Check “V” signal wires &
connections, replace or
repair as necessary
Check t-
stat, replace if
necessary.
(pre-purge) IDM runs for 30 sec. at high speed?
Does IDM Run for 60 Sec. and then off
for five minutes with fault
45, 48 or 57 displayed?
- See FAULT CODES under “Troubleshooting” in
I&O Manual.
J16-4
J16-5 on IFC.
If IFC goes into lockout (”r” will be displayed at SSD’s), shut off
main power to unit, wait 30 seconds then reset power or removed heat
call and re-establish.
- Check all connections between I.F.C. & E.C.M. Motor.
- Check 24v to E.C.M. control (4pin connector, pin 1-4)
- Check Dip switch setting.
- Check P.F.C. choke.
- Check all wiring and connections to P.F.C choke.
- Check fault code display, see
“fault codes” in I & O.
- Check line voltage to motor (115VAC).
Does ECM blower start on high heat
speed 15-20 seconds after burners light?
Note: IFC SSD’s will display “22, 33 or 23”.
?
If good flame is not sensed a fault code
“11” or “13” will be displayed at SSD’s
“12” is low flame sense, furnace should
still operate well.
Fault code
“45”, “46” or
“57” displayed
at SSD’s.
- Check test mode dip switches.
- Make sure test mode has not
expired (1 hour limit).
- Fault codes at IFC SSD - see FAULT CODES under troubleshooting
in I&O manual.
- 24V Between IFC pins J16, Pin 4 & J16, Pin 5 of I.F.C.
- Make sure heat call present at T-stat.
- T-stat wires and connections
Remove heat call by setting T-stat set point below
room temperature. remove power to furnace and open
blower door. Set dip switch SW2-2 to “ON” and SW2-3
to “OFF”. Replace furnace door, reset po
wer to
furnace. Initiate new heat call. Allow heat call to
proceed through blower on delay. The burners drop
from high fire to low (40%) rate and I.B.M. energizes at
low heat CFM.
Check to make sure test mode dip switches are properly set.
- Check all connections between IFC and ECM motor.
- Check 24V to ECM Motor. (low voltage connector, pins 1 & 4)
- Check P.F.C. Choke.
- Check all wiring and connections to P.F.C. choke.
- Check fault code display and see “fault codes” In I & O.
Does I. B. M. energize at low speed?
After Blower on delay, Does IDM switch to low speed
and remain a
t low speed after switching?
Does furnace continue to operate at low
fire until T-stat satisfied or heat call
removed?
Ensure T-stat not
switching to high fire or
test mode dips witches
not timing out (1 hour
limit)
Fault code displayed?
See FAULT CODES under
troubelshooting in the I & O Manual
Does IDM Shut off after Twenty Second post purge?
Does I. B. M. shut off after 90 seconds? (plus slew)
Double check - is heat call
completely off at IFC?
** System will attempt to light 4 times. Voltage Is present at gas valve for
only 7 seconds during each ignition trial. System will enter a 1 hour
lockout after 4 attempts.
For Comm. System
Lower case “h”
Capital “H”
2 Stg. or 1 Stg. Non Comm. T-stat
-Check line voltage at I.D.M.
-Check Wires And connections between I.D.M. and I.F.C.
-Ensure line voltage between J2, Pin 1 & J2, Pin 4 of I.F.C. (High IN Output).
-Check I.D.M. Capacitor.
Spark Electrodes (SE) Energize?
See I&O.
Does gas valve remain
energized?
PROBLEM
PERSISTS
- ensure no restrictions, such as dirty filter, blower wheel,
dampers or closed registers, Etc. exist.
- ensure good wire and connections between I.F.C. and all limits.
makes sure limits are not open when circulating air temperature is within a
specific range.
- Ensure rollouts or overtemperature limits do not need to be
reset. make sure no flame rollout in burner compartment due to blocked flue
or heat exchanger or combustion restriction.
- ensure furnace is not overfired (temp rise is above stated
range). Check gas valve, proper orifice size, gas presure
-Grounding on I.F.C. in place and continuity between screw and field
-installed ground.
-Flame sense rod clean (clean if nessessary).
-Wire continunity between flame sense rod and J1, Pin1 on I.F.C.
-Flame carries across all burners, and all burners stay lit.
Remove heat call by setting
T-stat below room temp.
Remove power to furnace, open blower compartment
and restore dip switches to original settings. Replace
blower door. Restore power to unit.
- Check wire and all connections between I.F.C.J2 and I.D.M
- Check for 115 VAC on P2.
- Check I.D.M. capacitor.
- Check I.D.M. low speed. Replace if neccessary.
C
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I

Rheem RGFE Specifications

General

Brand	Rheem
Model	RGFE
Category	Furnace
Language	English