Carrierメーカー58MVPの使用説明書/サービス説明書
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58MVP Variable-Speed 2-Stage Electronic Condensing Furnace Troubleshooting Guide NOTE: Read the entire instruction manual before starting the installation. SAFETY CONSIDERATIONS INDEX PAGE Instructions .................................................
Step 1—Self-Test Mode The control center goes through a brief self test whenever 115-v or 24-v power is interrupted. The self test takes approximately 2 sec to complete. After power is restored, red (microprocessor) LED briefly comes on. Then green LED comes on for 1 sec, followed by 1 sec where both yellow and green LEDs are on.
In emergency heat mode, the normal heat mode outlined in Heating Mode section is not followed. The following sequence will occur: When thermostat calls for heat, the R-W/W-1 circuits close. 1. Prepurge period —The inducer motor is turned on IMMEDI- ATELY operating at maximum speed, closing low- and high-pressure switches.
b. R-W/W1 with R-Y/Y2 and R-G signals terminated — The blower continues to operate completing a normal blower off delay. 11. Post purge —The inducer continues operating for 15 sec after gas valve is de-energized. Step 7—Continuous Fan Mode 1. Operating with continuous fan only .
When items 1-5 have been completed, the following will occur: 1. The control center goes through a brief self test. This self test takes approximately 2 sec to complete. After door switch is closed, red (microprocessor) LED briefly comes on. Then green LED comes on for 1 sec, followed by 1 sec where both green and yellow LEDs are on.
START HERE—If a problem exists, the service technician should always begin troubleshooting here. STEP ACTION YES NO GO TO 1. Remove furnace door first. DO NOT REMOVE BLOWER ACCESS PANEL! Record status of LED’s 1-4. See Service Label/Fault Code Instructions (Fig.
A99243a EA CH OF THE FOLLOWING ST A TUS CODES I S A TWO DIGIT NUMBER W I TH THE FIRST DI GIT DETERMINED BY NUMBER O F FLASHES OF T HE YEL LOW LED AND THE SECOND DIGIT DETERMINED BY NUMBER O F FLASHES OF T HE GREEN LED . F ur n a c e i s oper ati ng i n emer ge nc y h ea t .
→ Fig. 4—Service Label/Fault Code Instructions A99243b A99243 T o i n i ti a te the co mpo n en t t es t s equ en ce , shu t " O FF" th e ro om th er mos ta t o r d i sc on ne ct t he " R" ther mosta t l ead.
IMPROPER OPERATION WITH NO FLASHING FAULT CODE—Generally, this indicates there is no power to furnace control board. STEP ACTION YES NO GO TO 1. Make sure power is on. —— 2 2. Remove blower access panel and depress door switch. Use a piece of tape to hold switch closed.
NOT ENOUGH COOLING AIRFLOW—Generally, this indicates the Y/Y2 thermostat lead is not properly connected. STEP ACTION YES NO GO TO 1. Remove blower access panel and depress door switch. Use a piece of tape to hold switch closed. Wait a few sec for self test before proceeding to next step.
HIGH-FIRE TEMPERATURE TOO LOW—Generally, this indicates the HIGH/LOW solenoid in gas valve GV has failed or furnace is extremely underfired. STEP ACTION YES NO GO TO 1. Turn power off and remove blower access panel. Make sure thermostat is NOT calling for heat.
28. Put setup switch SW-1 back in OFF position. — — 29 29. Jumper R and W/W1 thermostat terminals. — — 30 30. Does RED LED2 turn back ON? 73 1 — 31. Install isolation relays in the W/W1 and Y/Y2 circuits per Fig. 5 in Appendix B or replace thermostat.
Fault Code 11 NO FAULT IN RECENT HISTORY DISPLAY—This indicates 1 of the following: • No faults have occurred in the last 5 previous cycles and setup switch SW-1 is in ON position. • The fault history can be cleared by jumpering R, W/W1, and Y/Y2 thermostat leads simultaneously while setup switch SW-1 is in ON position.
19. You have an open wire or bad terminal on either the ORANGE or VIOLET wire between connectors PL13 and PL3. Repair it or replace blower harness(es). —— 5 20. Remove tape from door switch and turn power off at main disconnect. — — 21 21. Does blower wheel rub against blower housing? 4 22 — 22.
Wait at least 5 minutes after disconnecting line voltage from equipment before opening blower motor to prevent electric shock which can cause personal injury or death. → 44. Remove tape from door switch and turn power off at main disconnect. —— 4 5 → 45.
16. Does the installation have a bypass humidifier? 17 30 — 17. Is setup switch SW-3 in ON position? 19 18 — 18. Put setup switch SW-3 in ON position. — — 9 19. Cycle furnace with blower access panel in place and record temperature rise across furnace 6 min- utes after main burner ignition.
Fault Code 14 IGNITION LOCKOUT—This fault indicates the system failed to ignite gas and prove flame in 4 attempts. Control will auto-reset in 3 hr. This fault could also indicate the gas valve relay GVR on furnace control board is stuck closed or there is a miswire/short to gas valve wiring.
Fault Code 22 SETUP ERROR—This fault indicates that setup switches SW-1 or SW-6 are ON when they should be OFF. The following combinations will cause the fault: • Thermostat call with SW-1 ON. • Thermostat call with SW-6 ON. • SW-1 and SW-6 both ON together.
Fault Code 24 SECONDARY VOLTAGE FUSE IS OPEN—Indicates fuse is open and there is a short in low-voltage wiring. STEP ACTION YES NO GO TO 1. Turn power off and remove blower access panel. — — 2 2. Is secondary voltage fuse blown? Check continuity to make sure.
18. Do you have continuity between the N.O. (Normally Open) contact on low-pressure switch LPS and chassis ground? 19 3 — 19. The ORANGE wire from low-pressure switch LPS is shorting to ground. Replace or repair it. — — 9 20. Does Fault Code 24 occur when gas valve GV is energized? 21 28 — 21.
Fault Code 31 HIGH-PRESSURE SWITCH FAULT—This fault can occur under the scenarios shown below, keep in mind that whenever furnace control board shuts unit down, gas shuts off immediately, inducer continues running for 15 sec, and if blower is running, it remains running at low-heat speed or reduces to low-heat speed for selected off delay.
25. Connect 1 side of a slope manometer with a tee to collector box pressure tap. Connect other side with a tee to gas valve air pressure fitting. Refer to pressure check diagram in Appendix C. —— 2 6 26. Turn power on and wait several sec, then jumper R and W/W1 thermostat terminals on furnace con- trol board.
Fault Code 32 LOW-PRESSURE SWITCH FAULT—This fault can occur under the scenarios shown below. Keep in mind that whenever the furnace control board shuts unit down, gas shuts off immediately, inducer continues running for 15 sec, and if blower is running it remains running at low-heat speed or reduces to low-heat speed for selected off delay.
29. Is inducer blower wheel okay? 31 30 — 30. If possible, replace inducer blower wheel. Otherwise, replace inducer motor assembly. — — 10 31. Is there any frost build-up on combustion-air inlet? 32 33 — 32. The problem is caused by reversed vent and combustion-air pipes or some other moist air entering combustion-air pipe.
9. Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS. — — INDEX 10. Consider this fault like a Fault Code 13 and go to page number indicated in Index for Fault Code 13. — — INDEX 11. Do you have 24v between terminals PL1-9 and C? 13 12 — 12.
Fault Code 34 IGNITION PROVING FAULT—This fault can indicate 1 of the following: • Flame was not sensed during trial for ignition period. The control will repeat ignition sequence 3 more times before going into Fault 14—IGNITION LOCKOUT. • The flame signal was lost after trial for ignition period.
41. Make sure perforated disks are in combustion-air vent inlet. — — 42 42. Check pressure tubing going to gas valve air pressure fitting for kinks. — — 43 43. Remove gas valve air pressure fitting and check gas valve for blockage. — — 44 44.
23. Are ORANGE and VIOLET wires from PL3 and PL13 making good contact? 24 17 — → 24. Replace entire blower motor or blower control module attached to the blower motor. If you replace the blower control module go to step 26. —— 1 7 → 25. Go to page number indicated in Index for CLEANUP AND STARTUP INSTRUCTIONS.
Fault Code 42 INDUCER OUTSIDE VALID SPEED RANGE—This fault indicates that inducer motor is not operating at calculated RPM or has not started within 10 sec after a call for heat. STEP ACTION YES NO GO TO 1. Turn power off, remove blower access panel, and disconnect all thermostat leads from furnace con- trol board.
43. If possible, replace inducer wheel. Otherwise, replace inducer motor assembly. — — 8 44. Is there any frost build-up on combustion-air inlet? 45 46 — 45. The problem is caused by reversed vent and combustion-air pipes or some other moist air entering combustion-air pipe.
4. Observe operation of furnace for several minutes or until fault occurs. — — 5 5. Does fault occur again? 96 — 6. Does a different fault occur? 78 — 7. Go to page number indicated in Index for fault code flashed. — — INDEX 8. Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS.
Fault Code 44 BLOWER CALIBRATION FAULT-This fault indicates that calculated blower motor speed is below 250 or above 1300 RPM. When Fault Code 44 occurs in HEATING, COOLING, or CONTINUOUS FAN mode, unit operates as shown below.
CLEANUP AND START-UP INSTRUCTIONS 1. Start furnace using procedure outlined on Lighting Instruc- tions attached to furnace. Observe operation of furnace through at least 1 complete heating cycle controlled from room thermostat. Observe each cycle for 20 minutes or until a fault code is flashed.
Appendix A Board Layout and Schematic W2 COM 24V W/W2 Y/Y2 RG HUM HOT SURFACE IGNITOR CONNECTOR EAC-ELECTRONIC AIR CLEANER TERMINALS (115-VAC 1 AMP MAX) 115-V CONNECTORS (SEE DETAILS ABOVE) 24-V THERMOSTAT TERMINALS PRESSURE SWITCH CONNECTOR HUM-HUMIDIFIER TERMINAL (24-VAC 0.
Wiring Schematic A98305 FRS LS ALS FSE GV C M P HI NOT E #3 3 PL1 PL7 12 1 0 4 6 12 ORN BRN YEL GRN BLK WHT 3 PL 9 HS I 12 1. 5 A MP EAC1 EAC2 2 1 PL4 1 2 3 7 8 4 5 6 YEL ORN BRN GR N BLU BRN RED 10 11 B2 RED 9 5 PL3 5BL U 4YEL 3VIO 2ORN 1RE D RE D ORN VIO YEL BLU WHT BLK RED ORN VIO YEL BLU 98 765432 1 PL10 1 PL 11 5 IND.
Appendix B Isolation Circuits THERMOSTAT FURNACE CONTROL BOARD K 1 K 1 K 2 K 2 OUTDOOR UNIT K 1 K 2 FIELD-SUPPLIED 24-VAC SPST RELAYS R W Y G C R Y / Y2 W / W1 G Com Y C A95097 Fig.
Appendix D Quick Motor Test Procedure In an effort to provide a method of troubleshooting inducer and blower motor by themselves, the following procedure may save you some time in the event any of the following fault codes are the reason for service call (12, 32, 41, 42, or 44).
30. Does blower wheel rub against blower housing? 16 31 — 31. Does blower wheel turn freely? 32 33 — 32. Is blower wheel firmly mounted on motor shaft? 34 16 — → 33. Replace blower motor or blower control module attached to the blower motor. If you replace the blower control module go to step 51.
Wait at least 5 minutes after disconnecting line voltage from equipment before opening blower motor to prevent electric shock which can cause personal injury or death. → 51. Remove tape from door switch and turn power off at main disconnect. — — 52 → 52.
Appendix E Variable-Speed Condensing Furnace Duct Static and Blower Operation This variable-speed furnace has an Integrated Control and Motor called an ICM. This ICM is controlled as stated in Sequence of Operation section. This furnace does a good job compensating for an improperly sized duct system, but this ICM is not a fix for all bad ductwork.
A97320 0.8 0.7 0.6 0.5 0.4 0.3 LOW HEAT HIGH HEAT Constant System Curves External Static Pressure (in. wc) 2 Ton 3 Ton 3 1 ⁄ 2 Ton 2 1 ⁄ 2 Ton 0.2 0.1 0 500 600 700 800 900 1000 1100 CFM 1200 1300 1400 1500 1 1 ⁄ 2 Ton Air Delivery Curve — 080-14 A93074 0.
Downflow Total Static Pressure Reading Locations A95091 Closet — Downflow Application ELECTRONIC AIR CLEANER HUMIDIFIER A/C COIL VENT COMBUSTION AIR OUTDOOR UNIT AIRFLOW RETURN STATIC INCLI.
Tools Needed: 1) Pitot Tube 1) Incline Manometer/Magnahelic Both examples are correct. Example 1 ESP readings were taken as laid out in Static Pressure Reading Location Diagrams.
Duct Static Check Sheet Furnace: Model Number Serial Number Position? U/F D/F H/R H/L Indoor Coil: Model Number Serial Number Outdoor Unit: Model Number Serial Number Thermostat Electronic Air Cleaner.
Appendix F Quick Reference Information PRESSURE SWITCH MAKE/BREAK POINTS UNIT SIZE (BTUH) HIGH-PRESSURE SWITCH LOW-PRESSURE SWITCH Make Point Break Point Make Point Break Point 40,000 1.81 in. wc max 1.63 in. wc ± 0.05 0.75 in. wc max 0.60 in. wc ± 0.
Appendix G Thermostat Staging Algorithm • Unit Default: Algorithm is initiated with Low Heat for 16 minutes. If call for heat still exists, unit transfers into High Heat until thermostat is satisfied. • Low Heat run time is calculated based on previous heating cycle.
A95094 VARIABLE SPEED CONDENSING FURNACE ALGORITHM Using recorded Low Heat (LH) and High Heat (HH) values, calculate the Heat Load (HL) using: HL=(228 X LH) + (350 X HH) Is HL < 3648? Is HL > 5600? Is 5600 > HL > 3648? Calculate Low Heat (LH) on time will be 16 minutes.
A94328 SERVICE TRAINING Packaged Service Training programs are an excellent way to increase your knowledge of the equipment discussed in this manual, including: • Unit Familiarization.
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