Table of Contents
Advertisement
SERVICING
SERVICING
COOLING /HEAT PUMP- SERVICE ANALYSIS GUIDE
Com plaint
POSSIBLE CAUSE
DOTS IN ANALYSIS
GUIDE INDICATE
"POSSIBLE CAUSE"
Pow er Failure
Blow n Fuse
Unbalanced Pow er, 3PH
Loose Connection
Shorted or Broken Wires
Open Fan Overload
Faulty Thermostat
Faulty Transf ormer
Shorted or Open Capacitor
Internal Compressor Overload Open
Shorted or Grounded Compressor
Compressor Stuck
Faulty Compressor Contactor
Faulty Fan Control
Open Control Circuit
Low V oltage
Faulty Evap. Fan Motor
Shorted or Grounded Fan Motor
Improper Cooling A nticipator
Shortage of Ref rigerant
Restricted Liquid Line
Open Element or Limit on Elec. Heater
Dirty A ir Filter
Dirty Indoor Coil
Not enough air across Indoor Coil
Too much air across Indoor Coil
Overcharge of Refrigerant
Dirty Outdoor Coil
Noncondensibles
Recirculation of Condensing A ir
Inf iltration of Outdoor A ir
Improperly Located Thermostat
A ir Flow Unbalanced
System Undersized
Broken Internal Parts
Broken V alves
Inef ficient Compressor
Loose Hold-dow n Bolts
Faulty Reversing V alve
Faulty Def rost Control
Faulty Def rost Thermostat
Flow rator Not Seating Properly
No Cooling
•
•
• •
•
• •
•
•
•
• • • • • •
• •
•
• •
•
•
•
•
• • • •
•
•
•
•
• •
•
• •
•
•
•
• •
•
•
•
•
• •
• •
♦
•
•
•
• •
• •
•
•
•
•
•
•
•
•
•
•
•
•
•
Cooling or Heating Cycle (He at Pum p)
Sys te m
Unsatis factory
Ope rating
Cooling/He ating
Pre s s ure s
♦
♦
•
• •
♦
• •
♦
• •
•
• •
•
• •
•
•
♦
•
♦
•
♦
•
♦
•
• •
•
•
•
♦
•
• •
• •
♦
•
♦ ♦ ♦
♦ ♦ ♦
♦ ♦ ♦ ♦ ♦
♦ ♦ ♦ ♦ ♦ ♦ ♦
• •
♦
He ating Cycle Only (Heat Pum p)
Test Method
Remedy
Test V oltage
Inspect Fuse Size & Type
Test V oltage
Inspect Connection - Tighten
Test Circuits With Ohmmeter
Test Continuity of Overload
Test continuity of Thermostat & Wiring
Check control circuit w ith voltmeter
Test Capacitor
Test Continuity of Overload
Test Motor Windings
Use Test Cord
Test continuity of Coil & Contacts
Test continuity of Coil A nd Contacts
Test Control Circuit w ith V oltmeter
Test V oltage
♦
Repair or Replace
•
Test Motor Windings
Check resistance of A nticipator
Test For Leaks, A dd Ref rigerant
•
Remove Restriction, Replace Restricted Part
Test Heater Element and Controls
♦
Inspect Filter-Clean or Replace
♦
Inspect Coil - Clean
♦
Check Blow er Speed, Duct Static Press, Filter
•
Reduce Blow er Speed
• •
Recover Part of Charge
•
Inspect Coil - Clean
•
Recover Charge, Evacuate, Recharge
•
Remove Obstruction to A ir Flow
Check Window s, Doors, V ent Fans, Etc.
Relocate Thermostat
Readjust A ir V olume Dampers
Ref igure Cooling Load
Replace Compressor
Test Compressor Ef ficiency
Test Compressor Ef ficiency
Tighten Bolts
Replace V alve or Solenoid
♦
Test Control
Test Def rost Thermostat
Check Flow rator & Seat or Replace Flow rator
S-1
S-1
S-1
S-2, S-3
S-2, S-3
S-17A
S-3
S-4
S-15
S-17A
S-17B
S-17D
S-7, S-8
S-7, S-9
S-4
S-1
S-16
S-16A ,D
S-3B
S-101,103
S-112
S-26,S-27
S-200
S-200
S-113
S-114
S-115
S-104
S-104
S-21, 122
S-24
S-25
S-111
23
Advertisement
Table of Contents
