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STEP 2- Stabilize the system by operating for a �--� <br /> minimum of 20 minutes. <br /> At startup, or whenever charge is removed or 20 MIN. <br /> added, the system must be operated for a mini- <br /> mum of 20 minutes to stabilize before accurate <br /> measurements can be made. <br /> STEP 3 - Check the liquid line temperature and <br /> liquid gage pressure to obtain a minimum of 1W <br /> subcooling in heating mode. <br /> Measured Liquid Line Temp = ° F <br /> Liquid Gage Pressure = PSIG <br /> STEP 4-Add charge if a minimum of 10°sub- <br /> cooling is not obtained with the namplate charge <br /> plus additional charge previously added. <br /> STEP 5 - Return to site for adjustment. <br /> Important: Return in the spring or summer to <br /> accurately charge the system in the cooling <br /> mode with outdoor ambient above 550 F. <br /> Section 15. Checkout Procedures and Troubleshooting <br /> 15.1 Operational And Checkout Procedures <br /> Final phases of this installation are the unit Operational and Checkout Procedures.To obtain proper performance, all units <br /> must be operated and charge adjustments made. <br /> Important:Perform a final unit inspection to be sure that factory tubing has not shifted during shipment.Adjust tubing if nec- <br /> essary so tubes do not rub against each other when the unit runs.Also be sure that wiring connections are tight and properly <br /> secured. <br /> CHECKOUT PROCEDURE <br /> After installation has been completed, it is recommended that the entire system be checked against the following list: <br /> 1. Leak check refrigerant lines. ........................................ [ ] 7. Be sure that indoor coil drain line drains freely. Pour water <br /> 2. Properly insulate suction lines and fittings.................... [ ] into drain pan................................................................ [ ] <br /> 3. Properly secure and isolate all refrigerant lines............ [ ] 8. Be sure that supply registers and return grilles are open <br /> and unobstructed.......................................................... [ l <br /> 4. Seal passages through masonry. <br /> If mortar is used, prevent mortar from coming 9• Be sure that a return air filter is installed...................... [ ] <br /> into direct contact with copper tubing........................... [ ] 10. Be sure that the correct airflow setting is used. <br /> 5. Verify that all electrical connections are tight................ [ ] (Indoor blower motor)................................................... [ ] <br /> 6. Observe outdoor fan during on cycle for clearance 11. Operate complete system in each mode to <br /> and smooth operation................................................... [ ] ensure safe operation................................................... [ l <br /> 22 18-BC108D1-1 B-EN <br />