R4S - The HVAC Doctor

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R4S - The HVAC Doctor

- Having Chiller Problems?
- Need HVAC Maintenance?
- VRF Not working properly?
- Need an HVAC repair work?
- Need Spare Parts? The HVAC Doctor is in the town.

R4S Technical Solutions Ltd. can fix your HVAC need right away! R4S Technical Solutions LTD. is a concern company of Tritech Building Services LTD. The main objective of the company is to provide services in the field of HVAC (Heating, Ventilation, and Air-conditioning).

28/08/2026

Thermostat reads 24°C, but the room actually feels like 27°C — the sensor could be the culprit.
Temperature sensors drift over time, causing the system to act on inaccurate data — sometimes overcooling, sometimes
undercooling. Regular calibration eliminates this problem.
▸
Sensor Accuracy Test: Comparing readings against a reference device for accuracy.
▸
Re-calibration or Replacement: Resetting or replacing the sensor as needed.
▸
Zone-Wise Consistency Check: Cross-checking sensors across multiple zones.
Room temperature feels off? Call R4S for sensor calibration.
📞
Contact Us: 01786337700
📞
Hotline: 09610441044
📧
Email: [email protected]
🌐
Web: www.r4sbd.com

27/08/2026

One small gap in pipe insulation means energy loss and condensation damage.
If a VRF system's refrigerant piping isn't properly insulated, cooling capacity drops, moisture builds up and corrodes the
pipes, and you may even see water stains on walls or ceilings.

Insulation Continuity Check: Verifying insulation integrity at every joint and bend.

Moisture Damage Detection: Identifying wet or damaged insulation for replacement.

Pipe Support & Routing Review: Ensuring long-term structural stability.
Get your pipe insulation inspected and stop energy loss. Call R4S.
📞
Contact Us: 01786337700
📞
Hotline: 09610441044
📧
Email: [email protected]
🌐
Web: www.r4sbd.com

26/08/2026

A stalled fan on your VRF outdoor unit means reduced cooling capacity across the entire system.
When the fan motor fails, the outdoor unit can't reject heat properly, putting extra strain on the whole VRF system and
shortening the compressor's lifespan. Quick replacement is the most important step here.

Fast Fault Diagnosis: Identifying the true cause of motor failure and resolving it.

Genuine Replacement Parts: OEM-grade fan motors for long-term reliability.

Post-Replacement Testing: Verifying full system performance after the swap.
Hearing strange noises or a fan that won't spin? Call R4S today.
📞
Contact Us: 01786337700
📞
Hotline: 09610441044
📧
Email: [email protected]
🌐
Web: www.r4sbd.com

25/08/2026

Water dripping from your FCU or reduced cooling? It often starts with one small issue.
Without proper servicing, a Fan Coil Unit loses airflow, develops condensate leaks, and cooling performance gradually
drops. Regular servicing catches these problems early, before they escalate.

Coil & Filter Cleaning: Preventing reduced airflow caused by dust build-up.

Fan Motor & Bearing Check: Catching unusual noise or vibration before it gets worse.

Condensate Drain Testing: Avoiding overflow or leakage from clogged drain lines.
Noticing any issue with your FCU? Let the R4S team know right away.
📞
Contact Us: 01786337700
📞
Hotline: 09610441044
📧
Email: [email protected]
🌐
Web: www.r4sbd.com

24/08/2026

A poorly installed AHU means the entire building's air system will suffer.
The Air Handling Unit is the heart of your entire HVAC network — from fresh air intake to filtration, cooling, and distribution,
everything is controlled from here. A wrong installation means uneven airflow, higher power bills, and frequent breakdowns.
▸ Correct Sizing & Placement: Selecting and positioning the right AHU based on your building's load.
▸ Duct Connection Verification: Every joint precisely checked to prevent air leakage.
▸ Commissioning & Performance Test: Full system testing before the unit goes live.
Need a new AHU installation or commissioning? Call R4S today!
📞 Contact Us: 01786337700
📞 Hotline: 09610441044
📧 Email: [email protected]
🌐 Web: www.r4sbd.com

22/08/2026

An old VRF system doesn't always need replacing. Sometimes it needs a proper overhaul.

Years of use, skipped maintenance, or accumulated small faults can leave a VRF system running far below its real capacity. R4S offers full-system repair and overhaul — restoring performance without the cost of a full replacement.

✔ Full-system inspection, indoor and outdoor units
✔ Repairs across electrical, mechanical, and refrigerant faults
✔ Restores performance closer to original capacity
✔ A cost-effective alternative to full replacement

Old system underperforming? Ask R4S about a full overhaul.

📞 +8801786337700
096 1044 1044
[email protected]
www.r4sbd.com

21/08/2026

Scale buildup doesn't stop your chiller. It just makes it work twice as hard.

Mineral scale inside chiller pipes reduces heat transfer and drives up energy use. R4S removes this buildup using world-class descaling chemicals, restoring full cooling power.

✔ Safe, world-class descaling chemicals
✔ Restores full heat-transfer efficiency
✔ Reduces energy consumption
✔ Extends equipment lifespan

Book a descaling service before scale costs you more.

📞 +8801786337700
096 1044 1044
[email protected]
www.r4sbd.com

20/08/2026

Your cooling tower water quality decides how long your chiller really lasts.

Poor water quality causes scale, corrosion, and bacterial growth inside cooling towers and condenser lines — quietly reducing efficiency and shortening equipment life. R4S tests your water samples regularly to catch issues before they cause damage.

✔ Regular water sample testing for cooling towers & condensers
✔ Checks pH, hardness, and contamination levels
✔ Early detection of scale and corrosion risk
✔ Recommendations tailored to your system

When was your cooling water last tested?

📞 +8801786337700
096 1044 1044
[email protected]
www.r4sbd.com

19/08/2026

A guest never sees your plant room. They just feel the room temperature.

R4S keeps hotel cooling systems running quietly and reliably behind the scenes, so guests always stay comfortable — without ever knowing the work it took.

✔ Quiet, reliable maintenance behind the scenes
✔ Scheduled servicing that avoids guest disruption
✔ Fast response for guest-facing issues
✔ Trusted by hotels across Bangladesh

Comfortable guests start with a properly maintained system.

📞 +8801786337700
096 1044 1044
[email protected]
www.r4sbd.com

18/08/2026

The compressor is the heart of your VRF system. When it struggles, everything struggles.

Warm air, unusual noise, or the outdoor unit tripping repeatedly can point to a compressor issue — but not every compressor problem means replacement. R4S runs a full diagnostic before recommending any solution.

✔ Full compressor performance diagnostic
✔ Repair-first approach — replacement only when necessary
✔ Genuine compressors sourced for all major VRF brands
✔ Post-repair performance testing before we leave

Compressor acting up? Get a proper diagnosis from R4S.

📞 +8801786337700
096 1044 1044
[email protected]
www.r4sbd.com

Address

26A/C, 1st Colony, Mazar Road, Darussalam, Mirpur/1
Dhaka
1216

Telephone

+8809610441044

Website

https://r4sbd.com/, https://www.linkedin.com/company/request4services/

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