Compressor Installation Report

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.

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