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Desired Outcome:
Desired Outcome:
Protect workers, occupants, and environment during equipment removal. Safe, compliant, efficient, and effective system installation in which sequence of operation is correct.
Protect workers, occupants, and environment during equipment removal. Safe, compliant, efficient, and effective system installation in which sequence of operation is correct.
SWS Detail: 5.0108.1 Air-to-Air Split System; 5.0103 Refrigerant Loop; 5.8801 Equipment Removal
Author: Jesse Waite
Before
Before
After
After
Steps
Steps
1. Reclaim old refrigerant
1. Reclaim old refrigerant
Carefully remove the refrigerant following EPA guidelines.
2. Remove old equipment
2. Remove old equipment
Remove the old evaporator coil and condenser.
3. Inspect existing line-set
3. Inspect existing line-set
Check the condition & compatibility of the existing line-set.
Replace the filter dryer.
Replace/repair if damaged, kinked, or if not compatible with new equipment.
4. Verify new coil and condenser size
4. Verify new coil and condenser size
Review the Manual J and Manual S for the house you are working on to verify equipment is sized correctly.
5. Install coil
5. Install coil
Pick a coil that will allow for a maximum SEER rating for the condenser that is being installed. This information can be found at https://www.ahridirectory.org.
Install the new coil and condensate drains to manufacturer specs.
Make sure the duct work allows for air to move across the entire coil.
6. Install condenser
6. Install condenser
Make sure the pad is level and is installed far enough away from walls or fences to allow for proper air flow and circulation.
Install the new condenser in accordance with the manufacturer specs.
A new liquid line filter dryer shall be installed on a new or re-used lineset. The old filter dryer needs to be removed to prevent restrictions.
7. Braze line-set
7. Braze line-set
Trickle nitrogen through the system as you braze. This will keep copper oxide from forming inside the line set and also help dry out the line set to speed up the vacuum process.
Be sure to remove both valve cores during this process so pressure does not build and they are not melted as you braze.
A recommended tool for this is a HVAC Nitrogen Regulator such as the VN-500 with a Braze setting.
8. Test for leaks
8. Test for leaks
Pressure test the line set to 300-500 psi.
A HVAC Nitrogen Regulator will have a "Test" setting that will usually pressurize to 250 psi or 500 psi depending on the model.
Leave nitrogen in line set for a minimum of 15 minutes and check for a pressure drop. During that time also check for leaks with a soapy solution.
Caution: Make sure your gauges are rated for the test pressure you want to test at.
9. Vacuum system
9. Vacuum system
Vacuum down the line set to a minimum of 350 microns preferably 200 microns.
Once 350-200 microns has been reached, isolate the vacuum pump. Vacuum will be complete if the Micron Gauge does not rise above 500 microns within 15-30 minutes.
10. Charge system
10. Charge system
Release pre-charged refrigerant.
Charge the system according to manufacturer specifications. When outdoor temperatures allow accurate pressure measurements, adjust the charge based on line set length. If temperatures do not allow accurate pressure readings, use the weigh-in method to ensure a proper charge and prevent system damage.
11. Insulate refrigerant lines
11. Insulate refrigerant lines
Insulate all suction lines to a minimum of R-4 with an insulation that is a class II or better vapor retarder.
Insulate all high pressure lines that pass through spaces where condensation may occur to a minimum of R-4 with an insulation that is a class II or better vapor retarder.
Seal all seams, joints, etc. of insulation using compatible material (e.g., tape).
Install UV-resistant insulation on exterior lines to protect insulation from UV degradation.
12. Wire condenser
12. Wire condenser
Ensure proper breaker/fuse size and a weather tight conduit is used for the whip.
Connect high voltage and low voltage wiring as described in the manufacturer instructions.
13. Complete A/C start up form
13. Complete A/C start up form
Complete the A/C start-up form for new A/C systems found on the Utah WAP resources page (https://jobs.utah.gov/housing/scso/wap/iwtc/resource.html).
Ensure the Sub-cooling & Superheat are within the manufacturer specs and pressures are within range of the chart posted inside the panel.
14. Worst Cast Draft test
14. Worst Cast Draft test
Conduct a Worst Case draft test to verify Category I, II and III are venting safely before leaving home for the day.
Testing shall be recorded using the Utah WAP Worst Case Draft Test form.
EPA-608 Card required:
EPA-608 Card required:
Only EPA-608 Universal or Type II Certified individuals are allowed to perform this measure.
Follow manufacturer specs
Follow manufacturer specs
All equipment must be installed according to manufacturer specifications.
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