Carrier PTV Installation, Start-Up And Service Instructions Manual page 49

Puron :R; refrigerant (R-410A) requires theuse of synthetic
lubricant (POE oil).Donotuse colmnon tools onsystems
thatcontain R -22 refrigerants ormineral oil.Contamina-
tionand failure o fthis equipment may result.
IMPORTANT: Dueto thehygroscopic nature of the
POE oil in Puron refrigerant (R-410A) andother e nvi-
ronmentally sound r efrigerants, anycomponent replace-
mentmustbe conducted in a timelymanner u sing
caution a nd proper s ervice p rocedure forthese types of
refrigerants. A complete installation instruction will be
included w itheach replacement TXV/filter d rier a ssem-
bly.It is of critical i mportance these instructions are
carefully understood andfollowed. F ailure to follow
these i nstructions can result i n asystem thatis contami-
nated w ithmoisture totheextent thatseveral filterdrier
replacements may be required to properlydry the
system.
IMPORTANT: Repair o f anysealed r efrigerant system
requires training i nthe use ofrefrigeration tools and proce-
dures. Repair should o nlybeattempted byaqualified s er-
vice technician. A universal refrigerant handling certificate
will berequired. Local a nd/or state license o r certificate
may also berequired.
See Tables 30-32 for additional troubleshooting
information.
Disconnect power from unit before removing or replacing
connectors, or servicing motor. Wait 5 minutes after dis-
connecting power before opening motor.
Table 30 -- ECM Troubleshooting
FAULT DESCRIPTION SOLUTION
Motor rocks slightly when This is normal start-up for ECM.
starting
Motor will not start No movement
Motor rocks
Motor oscillates up and down
while being tested off of blower
Motor starts, but runs erratically Varies up and down or intermittent
"Hunts" or "puffs" at high cfm
(speed)
Stays at low cfm despite system
call for cool or heat cfm
Stays at high cfm
Blower will not shut off
Excessive noise Noisy blower or cabinet
Check power at motor.
Check low voltage (24-vac R to C) at motor.
Check low voltage connections (G,Y, W, R, C) at motor.
Check for unseated pins in connectors on motor harness. See Fig. 42.
Test with a temporary jumper between R and G.
Check motor for tight shaft.
Perform motor/control replacement check.
Run moisture check. See Moisture Check section in Troubleshooting.
Check for loose or non-compliant motor mount.
Make sure blower wheel is tight on shaft.
Perform motor/control replacement check.
It is normal for motor to oscillate with no load on shaft.
"Hunts" or "puffs" at high cfm
(speed)
Motor failure or malfunction has
occurred and moisture is present
Evidence of moisture present
inside air mover
Check line voltage for variation or "sag."
Check low voltage connections (G,Y, W, R, C) at motor, unseated pins in motor harness
connectors. See Fig. 42.
Check "Bk" for erratic cfm command (in variable speed applications).
Check system controls, thermostat.
Perform moisture check. See Moisture Check section in Troubleshooting.
If removing panel or filter reduces "puffing," reduce restriction or reduce maximum airflow.
Check low voltage (thermostat) wires and connections.
Verify fan is not in delay mode. Wait until delay is complete.
Check to see if "R" is missing/not connected at motor.
Perform motor/control replacement check.
Check to see if "R" is missing/not connected at motor.
Verify fan is not in delay mode. Wait until delay is complete.
Perform motor/control replacement check.
Check to see if there is current leakage from controls into G, Y, or W. Check for Triac switched
thermostat or solid state relay.
Determine if it's air, cabinet, duct, or motor noise.
Check for loose blower housing, panels, etc.
If high static is creating high blower speed, check for air whistling through seams in ducts,
cabinets, or panels.
If high static is creating high blower speed, check for cabinet/duct deformaton.
If removing panel or filter reduces "puffing," reduce restriction or reduce maximum airflow.
Evidence of moisture Replace motor and perform moisture check. See Moisture Check section in Troubleshooting.
Perform moisture check. See Moisture Check section in Troubleshooting.
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