R-22 → R-32 / R-454B Chiller Conversion Playbook — Get Ready Before Thailand's 2030 Phase-out

Thailand is scheduled to phase out R-22 (HCFC-22) under its Kigali Amendment commitments by 2030 — no new R-22 imports, no use in new equipment, and existing systems limited to reclaimed refrigerant (recovered from decommissioned systems) only. Factories still running R-22 chillers — Carrier 30HXC, Trane RTHB, York YCAS, Daikin McQuay units from the 1990s to early 2000s — need to plan their conversion by Q4-2027 so it lands in the next budget cycle and ahead of the technician shortage.

This article is a practical playbook for Facility / Engineering / Procurement teams who have to decide:

1. Which R-22 systems are worth converting vs. which to scrap
2. Which replacement refrigerant to choose — R-32 / R-454B / R-417a / R-407c
3. Real costs + timeline + risk
4. The A2L safety provisions you need to prepare for

Thailand Phase-out Timeline — the real numbers

Year	R-22 status in Thailand
2013-2024	Import quota restricted (cut 10-15% per year per the DIW plan)
2025-2026	Quota down to ~25% of 2013 — R-22 spot price up 40-60%
2027-2029	Quota down to ~10% — emphasis on reclaim from decommissioned systems
2030 onwards	No new R-22 imports; only reclaimed material through a licensed reclaimer (DIW วอ.) is permitted

Note: R-22 still inside a system at 2030 may continue in service — but top-ups + repairs must use reclaimed refrigerant only. Reclaimed price is projected at ≥ ฿15,000/kg by 2030 (vs ฿2,800-3,500/kg in 2026).

Retrofit candidate comparison for R-22 chillers

Replacement	ASHRAE Safety	GWP	Glide	EER vs R-22	Compressor swap?	Oil change	Cost per ton-R	Best for
R-32	A2L (mildly flammable)	675	0°C	+5% to +8%	New required (A2L compressor + control)	New POE	฿8,000-12,000	New equipment only — not a retrofit
R-454B (HFO blend)	A2L	466	<1°C	-2% to +3%	New required (A2L compressor)	New POE	฿9,000-14,000	New chiller + capital upgrade
R-417a	A1	2,346	4°C	-8% to -15%	Reuse existing	Mineral → POE	฿3,500-5,500	Quick drop-in retrofit — old systems with <5 years left
R-407c	A1	1,774	7°C	-3% to -8%	TXV swap required (high glide)	Mineral → POE	฿5,500-7,500	Mid-tier retrofit — average systems
R-422a / R-422d	A1	3,143 / 2,729	5°C	-5% to -10%	Reuse existing	Mineral OK	฿4,500-6,500	Drop-in for supermarket / cold storage

GWP warning: R-417a + the R-422 series carry high GWP (>2,000) → may need replacing again by 2035 (the Kigali HFC phase-down step) — use only to extend the life of a chiller you plan to decommission within 5-8 years.

3-option decision tree

Option 1 — Full system replacement (new R-454B / R-32)

Choose if: chiller is <8 years old + system still sound + a 15-25 year investment horizon = R-22 → R-454B with new compressor + new EXV + new POE oil. Same or higher cooling capacity.

• Cost: ฿35,000-55,000 per ton-refrigeration (TR) for a 100-500 TR chiller
• Timeline: design + spec + install, 3-5 months
• EER gain: +5-15% (depending on heat exchanger refurb)
• New service life: 15-20 years
• Standard: ASHRAE 15 A2L compliance — machine-room ventilation + leak detector per EN 378

Option 2 — Drop-in retrofit (R-417a)

Choose if: chiller is 10-15 years old + budget is tight + you need 3-5 more years of life

• Cost: ฿8,000-15,000 per TR (refrigerant + flush + POE oil + filter drier)
• Timeline: 1-2 weeks (including recovery + recharge)
• EER loss: -8% to -15% → higher power bill
• New service life: 3-7 years
• Standard: ASHRAE 34 A1 — no change to the safety system

Option 3 — Continue on reclaimed R-22

Choose if: chiller has <5 years left + the system has no leak

• Cost: ฿0 capex — but top-ups require reclaimed R-22 from a DIW-licensed reclaimer
• 2026 price: ฿3,500-5,000/kg
• 2030 price: ฿15,000+/kg (projected)
• Risk: a major leak in 2028+ → there may be no R-22 to buy → chiller down → emergency replacement at 1.5x the cost

A2L safety — what R-22 never required

R-32 and R-454B are classified A2L (mildly flammable) under ASHRAE 34 — low flammability, but they require extra provisions:

1. Machine-room ventilation: flow rate ≥ 0.0875 × √(M) cfm per kg of refrigerant charge (ASHRAE 15-2022 §7.4.2)
2. Refrigerant leak detector per EN 378: temperature + concentration sensors — alarm setpoint at 25% LFL
3. Electrical equipment in the machine room: ATEX Zone 2 or NEC Class I Div 2 where concentration risk exists
4. Charge limit: R-32 max 1.84 kg per occupied space (IEC 60335-2-40)
5. Refrigerant tech PPE: face shield + flame-resistant gloves + EN 1149 antistatic clothing

Extra cost: upgrading a machine room to A2L = ฿150,000-450,000 per chiller room depending on size.

Selection guide by chiller type

Chiller Type	OEM-recommended R-22 replacement	Note
Air-cooled screw chiller (Carrier 30HXC / Trane RTHB)	R-454B (new) or R-417a (drop-in)	New = best EER; drop-in = life extension
Water-cooled centrifugal (Trane CenTraVac / York YT)	R-513A (old R-134a → low-GWP)	R-22 centrifugals are rare — usually R-134a/R-123
Reciprocating chiller (Carrier 30RH / York YCAS)	R-407c or R-422a	Old technology — often scrapped instead
Rooftop unit (RTU) — light commercial	R-32 (new unit)	DX coil — full unit replacement

Related services

SAHA supplies and advises on:

• Replacement refrigerants: R-454B, R-417a, R-407c, R-422a — AHRI 700:2019 certified every lot
• POE compressor oil: Emkarate™ RL series — viscosity per the chiller OEM spec
• Refrigerant recovery service: recovery machine + cylinders + full DIW (วอ.) license
• A2L safety upgrade consult: ventilation + leak detector + ATEX equipment supply
• Bulk refrigerant cylinders: 11.3 kg disposable, 48 kg refillable, 750 kg bulk container

Summary for procurement + facility managers

Recommended sequence:

1. Q3-Q4 2026: Audit all R-22 chillers — record age / capacity / leak history / R-22 charge
2. Q1 2027: Rank chillers against the decision tree (replace / retrofit / continue)
3. Q2-Q3 2027: Spec + tender — issue a TOR that requires ASHRAE 15 A2L compliance for replacements
4. Q4 2027 - Q4 2028: Install the first batch (high-priority chillers)
5. 2029: Close out R-22 cylinder inventory — switch to reclaimed stock
6. 2030: Remaining R-22 machines → planned decommissioning

Don't wait until Q1 2030 to start — Thailand has a severe shortage of R-454B installers and A2L-trained techs, and installation prices will spike after 2028.

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This article summarizes the regulatory framework and technical options — it is not model-specific advice. For converting a particular chiller model, contact the Sahawatthanakit (1988) engineering team for a site survey + system selection report with ROI calculation.