What Happens During a Chemical Overhaul (Step-by-Step)

You know how quickly an air conditioner loses its cooling power in Singapore’s constant humidity.

As the dedicated chemical wash division of Billy Aircon, our team of 26 professionals has tackled these specific issues since 2003.

This hidden sludge blocks airflow and forces your compressor to work twice as hard.

We document the complete chemical overhaul aircon step by step procedure to show exactly how professionals clear away years of grime.

A thorough breakdown reveals why this method restores cooling power so effectively.

Let us examine the exact improvements you can expect and how this service protects your home investment.

The Full Workflow

A Full-Dismantle Chemical Overhaul takes exactly 1.5 to 2 hours per unit and follows a strict 11-step protocol.

We adapt this routine for wall-mounted, cassette, or ducted systems based on their exact condition.

Knowing the difference between service tiers helps you avoid paying for unnecessary procedures.

Step 1: Arrival and Walkthrough (5 min)

We begin with a five-minute diagnostic check to confirm unit counts and identify specific issues like weak cooling or ice formation.

This initial walkthrough helps the technician locate safe access points for equipment.

Our kit includes an anti-static mat for delicate electronics, a chemical bath tray, and a digital anemometer.

Many homeowners ignore a slight sour smell, but that often indicates early bacterial growth.

Step 2: Pre-Wash Inspection and Photo Documentation (10 min)

Our technicians take pre-wash photos of the evaporator coil and drain pan to document the exact level of contamination.

Visual proof ensures you know exactly what is happening inside your machine.

We isolate the power at the breaker before removing any covers.

Industry data from 2026 shows that 80% of unserviced residential units in Singapore harbour severe mould in the hidden back tray.

Step 3: Power Isolation and Component Identification (5 min)

We verify that the electrical breaker is completely shut off to prevent short circuits.

Safety remains the top priority before any internal wiring gets touched.

Our team identifies the control board, fan motor, and refrigerant lines while noting any existing pipe damage.

Replacing a water-damaged Printed Circuit Board (PCB) easily costs upwards of $250, so strict isolation is mandatory.

Step 4: FCU Dismount (15 to 20 min)

Our technicians fully uncouple the Fan Coil Unit (FCU) and lower it onto a protective ground sheet.

Dismounting the unit allows us to access the rear drainage pan that wall-mounted washing cannot reach.

We disconnect the control board and place it safely on a dry anti-static mat.

Leaving the unit on the wall is a common shortcut that fails to resolve persistent water leaks.

Step 5: Chemical Bath Soak (25 to 35 min)

We submerge the dismantled coil and blower wheel in a custom chemical bath tray for up to 35 minutes.

This soaking period dissolves hardened biofilm and grease at the molecular level.

Our standard protocol uses hospital-grade alkaline detergents like KLEN 2103 to protect the delicate aluminium fins.

Diluted at a one to six ratio, this non-corrosive solution melts away blockages without damaging the metal.

Step 6: Cover and Drain Pan Deep Clean (parallel, 20 min)

Our secondary technician scrubs the unit cover and drain pan while the main coil continues to soak.

Working in parallel ensures the entire chemical overhaul process stays within the two-hour window.

We flush the condensate pipe with targeted pressure to clear any residual slime.

Blocked condensate pipes cause the vast majority of indoor water leakage issues in HDB flats.

Step 7: Anti-Bacterial and Anti-Fungal Treatment (10 min)

We apply a specialised two-stage chemical spray to the freshly rinsed components to destroy remaining microbes.

The first layer targets common surface bacteria, while the second specifically neutralises stubborn mould spores.

Our treatment achieves a verified 99.9% kill rate against common indoor pollutants like Aspergillus.

Clean air matters just as much as cold air for your family’s respiratory health.

Step 8: Insulation Inspection (5 min)

Our team physically examines the internal Armaflex foam insulation surrounding the coil and refrigerant lines.

We look for signs of severe waterlogging or condensation damage that could cause future dripping.

Damp insulation frequently causes water to run down your wall, an issue many owners mistake for a cracked pipe.

Replacing degraded foam is a critical step that many budget providers skip entirely.

Step 9: Reassembly (15 to 20 min)

We verify that every single component is bone-dry before remounting the fan coil unit to your wall.

Moisture left near the control board can cause immediate electrical faults upon startup.

Our technicians reconnect the refrigerant lines using a torque wrench set to exact manufacturer specifications.

Proper flare nut torque prevents the slow gas leaks that ruin cooling efficiency.

Step 10: Gas Pressure Check (5 min)

Our final technical check involves measuring the refrigerant pressure at the outdoor condenser unit.

We attach a manifold gauge to confirm the system holds the correct volume of gas.

For modern R32 systems common across Singapore, the running pressure must sit between 120 and 150 PSI.

If the reading falls below specification, the technician will discuss a gas top-up as an optional add-on.

Step 11: Post-Wash Performance Reading and Cleanup (10 min)

We power on the system and use a digital anemometer to measure the restored airflow at the vent.

You will typically see a 30% to 50% increase in cubic feet per minute (CFM) compared to the pre-wash baseline.

Our technician also checks the temperature differential to ensure the output air is at least 8 to 12 degrees Celsius cooler than the room.

A digital receipt, complete with photos and your warranty card, is sent directly to your phone before we pack up the ground sheet.

What You’ll Notice After

You will experience colder air hitting the room within minutes of the newly cleaned unit running.

This immediate transformation occurs because the blower wheel can finally push air without resistance.

Our customers frequently report that their bedrooms reach the target temperature twice as fast.

The motor also operates much more quietly once the heavy layer of dust is removed.

Key immediate improvements you will observe:

• Cooler vent temperatures verified by anemometer
• Elimination of sour or musty room odours
• Faster cool-down times for master bedrooms
• Zero ice formation on the condenser pipes

Over the following month, the long-term benefits of an aircon overhaul singapore service become clear.

Because the compressor cycles off sooner, homes often see a 15% to 20% drop in cooling-related electricity costs.

We guarantee that any persistent condensation leaks will be completely resolved.

A clean system simply does not struggle to control the local humidity.

What If Something Goes Wrong After

We back every single service with a comprehensive 90-day workmanship warranty that covers the recurrence of any treated symptoms.

This guarantee gives you total peace of mind after the technicians leave your property.

Our team will book a return visit at no charge if a leak or smell returns within that window.

Just send a WhatsApp message to +65 9456 0875 with a description of the problem, and support staff will arrange a prompt follow-up.

We want to make the claim process as straightforward as possible.

Full details on these terms can be found in our 90-Day Workmanship Warranty guide.