A CU MANUAL
IOM-14 33 of 46 Feb 06 R4
INITIAL START-UP
To prevent possible injury to personal or equipment damage, the start-up shall be
performed by a Qualified Personal.
1. Check all packing material has been removed.
2. Check that shipping blocks and fasteners have been removed.
3. Check condenser fans to ensure they spin freely.
4. Check all electrical connections for tightness.
5. Check that power supply voltage matches the rating plate.
CHARGING
System charge will depend on the length and orientation of the installed system.
An initial estimate for an R-22 system charge is 1 lb. (0.5kg). per ton plus the weight of liquid in the liquid
line (see table 4 Weight of refrigerant in copper lines). Ideally charging should be done in warm weather.
If the ambient temperature is less than design, restrict the airflow across the condenser to increase head
pressure to 130°F (55°C) saturated discharge temperature for charging.
1. Check that all manual shut off valves in the refrigeration circuit are in the normal operating
position.
2. Weigh in an initial charge of approximately 75% of the estimated charge.
3. Check to ensure evaporator section has proper airflow. Check static pressure drop and compare
with design static. Check inlet air temperature to evaporator. Ensure that there is sufficient load to
operate the air conditioning.
4. Check the supply voltage and ensure that is within 10% of design voltage on unit rating plate.
5. Check control voltage at refrigerant solenoid valves and ensure that it is within 10% of rated
voltage.
Screw and Scroll compressors MUST be checked for proper rotation at startup.
Permanent damage can occur if rotation is not correct.
6. Set controls to call for cooling.
7. Close the system service switch.
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