Compressor Installation Report

Customer & Compressor Information Date:
1. Service Company Name

Technician Name
2. Compressor Location/Company Name
3. Compressor purchased from:
4. Old compressor information
Make Model Serial #
5. Approximate Age of System
6. New compressor information
Make Model Serial #
7. Application A/C Other
8. Type of Refrigerant

System Checks:

1. Evaporator Condition
2. Amperage Rated Actual Amperage
3. Filter Condition
4. Fan Belt Condition
5. Liquid Line Sight Glass
6. Suction Line Filter
7. Condenser Fans Cond. How Many N/A
8. Low Pressure Control New Used Setting
9. High Pressure Control New Used Setting
10. Oil Pressure Control New Used Setting
11. System Checked for Leaks?

Compressor Checks – Start Up

1. Oil Pressure on Start-Up N/A
2. Discharge temperature (after 1 minute)
Notes (1) In order to obtain data, if the compressor is fitted with an unloader, it must be set to run the compressor fully loaded during the test
(2) A digital electronic thermometer with touch probe is required to obtain accurate temperature reading.
Take voltage amperage at the contactor
Compressor Contact Voltage
#1 Contactor #2 Contactor
L1-L2 L1-L2
L1-L2 L1-L2
L1-L2 L1-L2
Compressor Contactor Amperage
#1 Contactor #2 Contactor
L1-L2 L1-L2
L1-L2 L1-L2
L1-L2 L1-L2
1. Discharge pressure/temp.
2. Suction pressure/temp.
3. Motor barrel temp. top
4. Motor barrel temp. side
5. Motor barrel temp. bottom
6. Crankcase temp.
7. Oil Level
8. Oil pressure/pump temp.
9. Liquid line temp. (leaving condenser)
10. Head Temperature

Compressor Checks Pre-Start

1. Number of contactors One Two New Used
2. Contactor Checked | Condition
3. Does system have time delay for (2) contactor
4. Crankcase heater Amp Draw
5. Oil level before start-up % glass
6. Does system have discharge temperature sensor
7. Does compressor have motor protector
8. Rated voltage Rated amperage (RLA)

Compressor & System Checks After 1 Hour

1. Does compressor have Unloaders
If yes: A. Number of stages
B. Amperage 1st stage unloaded L1 L2 L3
2nd stage unloaded L1 L2 L3
3rd stage unloaded L1 L2 L3
2. Does system have HGBP
If yes: A. Amperage during HGBP Mode L1 L2 L3
B. Discharge temperature during HGBP °
C. What controls HGBP
3. Does system have liquid line solenoid valve
If yes: A. Does system hold after pump down
B. Does system have time for restart
C. Does system have low pressure LPC relay
D. Does relay function properly
4. Does system have split coil
If yes: A. Superheat at TXV
#1 #2 #3 #4
5. What is superheat at the compressor

System Condition

Return Air Temperature ° H20 out
Supply Air Temperture ° H20 in
Temperature Differential Temperature Differential
6. Probable cause of compressor failure
7. Corrections or changes made in system
8. Are you happy with compressor performance

Compressor Temperatures Chart Guidelines

The temperature range and guidelines shown below can be considered good for the following conditions:

  1. R22 Systems
  2. Air Conditioning Duty (TXV)
  3. SCT equal 95°-115°

Reading from other condition will not fit into all the guidelines.


  • 1. Suction Line Temperature
    • 10°-20° above saturated suction temperature.
  • 2. Motor Barrel Temperature near crankcase
    • 80°-100°
    • a. Below 80° is a possible indication of flooding
    • b. Above 100° is possible indication of motor running too hot from
      • i. Too high heat
      • ii. Not enough suction gas with acceptable superheat to cool motor on low load conditions
  • Three temperatures at the motor barrel are required to find hot spots due to stator drag on the rotor if the motor end bearing has been lost due to flooding
  • 3. Underside of cylinder head
    • 80°-115°
    • a. Below 80° is possible indication for flooding
    • b. Above 115° is an indication of an unloaded cylinder or blown gasket or broken valves
  • 4. Crankcase Temperature
    • 105°-125°
    • a. Below 105° is an indication of flooding
    • b. Above 125° is an indication that the compressor is running too hot- generally caused by the high oil levels
  • 5. Hot Gas line Temperature
    • 160°-200°
    • a. Temperature below 160° after one-minute run time is an indication of flooding
    • b. Temperature above 200° is an indication that the compressor is running too hot
Compressor Installation Report 1

12901 Elmwood Avenue
Cleveland, OH 44111

Phone | 216-941-9200
Fax | 216-941-8801