Clear and Maintain a Condensate Drain Line

A. Finished-Project Specification

Quantity: one identified condensate drain system, inspected for slope, support, and joint condition; one cleaned drain line and trap; one verified float-switch check; one controlled flow test observed to the exterior discharge; and one completed Condensate Drain Service Worksheet.

B. Condensate Drain Service Schedule

Item	Target Condition	Verification Method
Component identification	Primary drain, secondary drain, trap, cleanout, vent, pump, pan, float switch, and discharge identified	Visual confirmation and written record
Slope	Continuous slope toward the discharge point along the full accessible run	Level check at multiple points
Trap condition	Clean, correctly oriented, and reprimed with the specified amount of clean water	Visual confirmation after reassembly
Float switch	Moves freely and is not bypassed	Manual movement check without disabling the switch
Flow test	Controlled test water flows through the trap, drain, pump, secondary path, and exterior discharge without leakage	Direct observation during test

C. Material Takeoff

• Cleaning materials: one manufacturer-approved cleaning brush, wet/dry vacuum with condensate-line attachment, absorbent towels.
• Reassembly materials: one compatible trap seal or gasket sized to the existing trap.
• Test materials: clean test water in the manufacturer-specified quantity, containers to catch discharge for confirmation.

D. Acceptance Standards

Check	Standard
Component identification	Every accessible condensate component identified and recorded before service begins
Slope and support	Continuous slope toward discharge with no reverse pitch or unsupported sagging sections
Trap condition	Clean, correctly oriented, reassembled with a compatible seal, and primed
Float-switch function	Moves freely under manual test without being bypassed or disabled
Flow test result	Test water observed flowing continuously from the test point to the exterior discharge with no leakage at disturbed joints
Documentation	Condensate Drain Service Worksheet complete with components, cleaning method, flow test result, and unresolved overflow risks

E. Preparation, Shutdown, and Work-Area Protection

1. Review the equipment instructions, drain arrangement, trap requirement, vent or cleanout locations, pump, float switches, auxiliary pan, and discharge point. Record each identified component before beginning service.
2. Shut down and de-energize the equipment and condensate pump where applicable. Follow the Chapter 2 procedure and verify absence of voltage at the approved test points.
3. Protect the work area against water and biological debris. Stage containers and absorbent material before opening any service point.

F. Component Identification and Condition Inspection

1. Identify the primary drain, secondary drain, trap, cleanout, vent, pump, pan, float switch, and discharge route. Record the location and material of each on the worksheet.
2. Inspect pipe size, slope, support, joints, insulation, algae buildup, leakage, and overflow staining. Use the level to check slope at multiple points along the accessible run.
3. Stop work if water is present in electrical compartments, the evaporator cabinet must be opened, or the drain configuration is unknown or unsafe. Record the condition and escalate before proceeding.

G. Clearing the Accessible Drain Line

1. Place containers and absorbent material beneath service points. Confirm containment before opening any fitting.
2. Open the approved cleanout or trap service point. Photograph the original orientation before disassembly.
3. Remove accessible debris using the manufacturer-approved brush, suction, low-pressure flushing, or cleaning method. Work from the accessible opening toward the discharge point.
4. Do not apply unapproved high pressure, compressed gas, corrosive chemicals, or bleach to equipment that prohibits it. Confirm the approved method and product against the equipment instructions before use.

H. Trap Service and Priming

1. Disassemble a serviceable trap only when the design permits it. Confirm the trap is a serviceable type before proceeding.
2. Clean and reassemble the trap with compatible seals and correct orientation. Match the reassembly to the photographed original orientation.
3. Prime the trap with the specified amount of clean water. Confirm the water level matches the manufacturer-specified priming volume.
4. Verify continuous slope and correct supports. Correct any reverse pitch or unsupported section identified during inspection.

I. Condensate Pump and Float-Switch Verification

1. Clean or inspect the accessible condensate pump reservoir only under its manufacturer procedure. Do not service internal pump components outside the approved procedure.
2. Verify float-switch movement without bypassing the safety controls. Confirm free movement through its full range and restore it to its normal operating position.

J. Flow Testing, Correction, and Restoration

1. Introduce a controlled quantity of clean water at the approved test point. Use the manufacturer-specified quantity and test-point location.
2. Observe flow through the trap, drain, pump, secondary path, and exterior discharge. Confirm water reaches the discharge point without excessive delay.
3. Inspect every disturbed joint for leakage. Check each reassembled or cleaned connection individually.
4. Verify that discharge does not damage the building, create a slip hazard, or enter a prohibited location. Confirm the discharge point matches the approved routing.
5. Correct reverse slope, loose supports, leaking joints, or blocked accessible sections. Repeat the flow test after any correction.
6. Restore equipment and observe condensate function during an authorized cooling cycle when conditions permit. Confirm normal operation without fault indications.
7. Document drain components, cleaning method, flow test, and unresolved overflow risks. Complete every field on the worksheet before closing out the project.