SplitAtlas

ACiQ / Multi-Zone Standard Series

ACiQ Standard 55k R-454B 208/230V 5-Zone Mini-Split

Certified capacity
60,000 BTU/h[3]
SEER2
22 SEER2[3]
Heating floor
-13 F[1]
Voltage
230 V[1]
Install path
Professional install

The ACiQ Multi-Zone Standard Series 5-Zone 55k is the largest unit in the lineup, five heads on one 208/230V outdoor unit on R-454B. It is dealer-quoted rather than a stocked retail-priced condenser, so pricing comes through a quote, and professional installation is required.

Certified numbers are SEER2 22, EER2 10, HSPF2 9.5; it is not ENERGY STAR certified and not AHRI cold-climate designated. Cooling capacity is 60000 BTU.

Heating falls through the cold - 60000 BTU at 47F, down to 42000 at 17F and 39000 at 5F.

5 zonesProfessional installCurrent

Refrigerant generation

R-454B - current-generation refrigerant

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Error Codes
ACiQ Multi-Zone Standard Series 5-Zone 55,000 BTU R-454B 208/230V (ES-55Z-M6C) mini-split heat pump outdoor condenser

Image: HVACDirect

Data completeness: 100%
Last sourced
Jul 29, 2026

SplitAtlas score

7.7 / 10

Methodology
Cooling efficiencyAbove average

(22.0 SEER2) among >36k systems

Heating efficiencyBottom quartile

(9.5 HSPF2) among >36k systems

Cold-weather performanceBottom quartile

(65% heat retained at 5F; -13 F heating floor) among >36k systems

WarrantyTop quartile

(7 yr parts / 12 yr compressor) across the catalogue

Feature setBottom quartile

(3 verified features) across the catalogue

Documentation & partsBelow average

(8 manuals; spec sheet) across the catalogue

Not evaluated

  • Installation accessibility — not applicable (professional install)N/A

    professional install - DIY-accessibility not applicable

  • Price-to-value — not evaluatedN/A

    This is a professionally installed, quote-only system, so we can't score its price. Get an installed quote to compare real cost.

    Get a quote

Key ratings

Rated cooling

60,000BTU/hNon-Ducted Indoor Units[3]

Rated heating

60,000BTU/hNon-Ducted Indoor Units[3]

Buyer review snapshot

Best for / skip if

Best for

  • 5-zone projects in the 60k outdoor capacity class.
  • High-efficiency shortlists; SEER2 is 22.

Install difficulty

Complex professional install
  • Electrical: 230V; MCA 40 A; breaker/fuse 45 A.
  • Line set: connection type not sourced; precharged 24.6 ft; max 262.4 ft.
  • 5-zone condenser; indoor-head matching and branch layout are part of the job.

Availability and price context

We could not verify a current retail price for this model. We found a configurable system page, but not an exact standalone retail listing for this model when we last checked on 2026-07-29.

Source date

Model data sourced
Jul 29, 2026
Page reviewed
Jul 29, 2026
Source-backed records
4
Newest source retrieved
Jul 29, 2026

Warranty tiers

Warranty: 7 years parts and 12 years compressor as standard.

Review methodology

Strengths

  • Largest ACiQ multi-zone - 60000 BTU cooling across five heads.
  • Certified SEER2 22 / EER2 10 / HSPF2 9.5.
  • Delivers full rated 60000 BTU of heat at 47F.
  • R-454B refrigerant.

Weaknesses

  • Not ENERGY STAR certified and not AHRI cold-climate designated.
  • Dealer-quoted, not a stocked retail-priced condenser you can buy.
  • Heating falls hard in the cold - 39000 BTU by 5F, below the 60000 at 47F.

Climate suitability

Minimum heating ambient
-13 F[1]
Rated heating at 5F
39,000 BTU/hNon-Ducted Indoor Units[3]
Rated heating at 17F
42,000 BTU/hNon-Ducted Indoor Units[3]
Rated heating at 47F
60,000 BTU/hNon-Ducted Indoor Units[3]

Specifications

Show
Manufacturer
ACiQ
Brand
ACiQ
Product line
Multi-Zone Standard Series
Model number
ES-55Z-M6C
Indoor unit model
Indoor heads are selected separately on a multi-zone system
Outdoor unit model
ES-55Z-M6C
Number of zones
5
Max indoor units
5 units[2]
Rated cooling capacity
60,000 BTU/hNon-Ducted Indoor Units[3]
Rated heating capacity
60,000 BTU/hNon-Ducted Indoor Units[3]
Voltage
230 V[1]
MCA
40 A[1]
Maximum fuse or breaker size
45 A[1]
Breaker needed
not published
SEER2
22 SEER2Non-Ducted Indoor Units[3]
EER2
10 EER2Non-Ducted Indoor Units[3]
HSPF2 (Region 4)
9.5 HSPF2Non-Ducted Indoor Units[3]
HSPF2 (Region 5)
Certified per indoor-unit combination, not per outdoor unit
COP
not published
COP at 47F
not published
COP at 5F
2.2 COPNon-Ducted Indoor Units[3]
Minimum outdoor heating temperature
-13 F[1]
Minimum outdoor cooling temperature
-13 F[1]
Maximum outdoor temperature
122 F[1]
Indoor noise range
Indoor heads are selected separately on a multi-zone system
Outdoor noise rating
65 dBA[1]
Indoor weight
Indoor heads are selected separately on a multi-zone system
Outdoor weight
237.88 lb[1]
Refrigerant
R-454B[3]
Refrigerant charge
151.68 oz[1]
Manufacturer coverage
not published
Line-set size
6 x 1/4 in liquid / 4 x 3/8 in + 2 x 1/2 in suction
Included line-set length
Indoor heads are selected separately on a multi-zone system
Maximum line-set length
262.4 ft[1]
Max line set per indoor
114.8 ft[1]
Maximum elevation difference
49.2 ft[1]
Max height between indoor units
ACiQ R-454B submittal extraction for this outdoor-only condenser did not publish a universal indoor-to-indoor height limit; selected indoor configuration governs.
Wi-Fi support
Indoor heads are selected separately on a multi-zone system
Energy Star status
Not ENERGY STAR certified[4]
AHRI certification number
216032388Non-Ducted Indoor Units[3]
Warranty
Standard: 7 yr parts / 12 yr compressor (published per-line ACiQ registration terms). 12-year compressor / 7-year parts warranty with ACiQ registration terms.
Install path
Professional install
Retail price
We found a configurable system page, but not an exact standalone retail listing for this model when we last checked on 2026-07-29.
Available retailers
not published
Manual links
AHRI public detail 216032388, ACiQ R454B Multi-Zone Compatibility Chart, ENERGY STAR exact lookup 216032388, ACiQ multi-zone installation and owner manual, ACiQ Multi-Zone Standard Series official category for ES-55Z-M6C, HVACDirect exact-offer audit for ES-55Z-M6C, ACiQ multi-zone service manual, ACiQ ES-55Z-M6C non-ducted multi-zone submittal
Specification sheet
ACiQ ES-55Z-M6C non-ducted multi-zone submittal
Last sourced date
Jul 29, 2026

Compatible indoor units

This is an outdoor unit. You choose its indoor heads separately - up to the maximum this condenser supports - and you can mix room sizes and styles across the zones. The models below are the heads this unit is documented to pair with.

  • Ceiling cassette air handlers

    9k, 12k, 18k, 24k

    Model numbers
    • 9k: ACiQ-09CC-HH-MC
    • 12k: ACiQ-12CC-HH-MC
    • 18k: ACiQ-18CC-HH-MC
    • 24k: ACiQ-24CC-HH-MC

  • Concealed duct air handlers

    9k, 12k, 18k, 24k

    Model numbers
    • 9k: ACiQ-09CD-HH-MC
    • 12k: ACiQ-12CD-HH-MC
    • 18k: ACiQ-18CD-HH-MC
    • 24k: ACiQ-24CD-HH-MC

  • Ducted air handlers

    18k, 24k, 30k, 36k

    Model numbers
    • 18k: ACiQ-18AHB-HH-MB
    • 24k: ACiQ-24AHB-HH-MB
    • 30k: ACiQ-30AHB-HH-MB
    • 36k: ACiQ-36AHB-HH-MB

  • Floor console / floor-ceiling air handlers

    9k, 12k, 18k, 24k

    Model numbers
    • 9k: ACiQ-09FM-HH-MD
    • 12k: ACiQ-12FM-HH-MD
    • 18k: ACiQ-18FM-HH-MD
    • 24k: ACiQ-24FM-HH-MD

  • Slim ceiling cassette air handlers

    18k

    Model numbers
    • 18k: SCC-18-HH-MB

  • Wall-mounted air handlers

    6k, 9k, 12k, 18k, 24k

    Model numbers
    • 6k: ACiQ-06W-HH-MD
    • 9k: ACiQ-09W-HH-MD
    • 12k: ACiQ-12W-HH-MD
    • 18k: ACiQ-18W-HH-MD
    • 24k: ACiQ-24W-HH-MD

Sizing note: do not just add up the rooms. Multi-zone condensers have a maximum total connected capacity, and connecting more head capacity than the unit is rated for is a common installer mistake that hurts efficiency and comfort. Match total head capacity to the condenser's rating.

Electrical requirements

Show
Voltage
230 V[1]
Voltage range
208/230V[1]
Phase
1[1]
Frequency
60 Hz[1]
MCA
40 A[1]
Breaker needed
not published
Maximum breaker size
45 A[1]
Maximum fuse size
45 A[1]
Maximum cooling current
not published
Maximum heating current
not published
Manufacturer wire notes
not published

Installation considerations

Show
Liquid line
6 x 1/4 in[1]
Suction line
4 x 3/8 in + 2 x 1/2 in[1]
Line connection type
not published
Precharged length
24.6 ft[1]
Included line-set length
Indoor heads are selected separately on a multi-zone system
Maximum line-set length
262.4 ft[1]
Max line set per indoor
114.8 ft[1]
Max height between indoor units
ACiQ R-454B submittal extraction for this outdoor-only condenser did not publish a universal indoor-to-indoor height limit; selected indoor configuration governs.
Indoor dimensions
Indoor heads are selected separately on a multi-zone system
Outdoor dimensions
37.48 x 16.34 x 52.48 in[1]
Indoor weight
Indoor heads are selected separately on a multi-zone system
Outdoor weight
237.88 lb[1]
Drain size
not published

Related systems and guides

Frequently asked questions

Can I install the ACiQ Multi-Zone Standard Series 5-Zone 55,000 BTU R-454B 208/230V (ES-55Z-M6C) myself, or do I need a pro?
ACiQ Multi-Zone Standard Series 5-Zone 55,000 BTU R-454B 208/230V (ES-55Z-M6C) is built for professional installation: the line set must be flared, evacuated, and charged, which requires EPA-certified refrigerant handling. Installing it outside the manufacturer's requirements can void the warranty, so budget for a qualified HVAC installer.
Will the ACiQ Multi-Zone Standard Series 5-Zone 55,000 BTU R-454B 208/230V (ES-55Z-M6C) keep heating in a cold winter?
The manufacturer publishes 39,000 BTU/h of heating output at 5F. Rated heating operation extends down to -13 F. Certified heating efficiency is 9.5 HSPF2. Match those numbers against your climate's design temperature - in cold regions, output at 5F matters far more than the nameplate capacity measured at 47F.
What electrical circuit does the ACiQ Multi-Zone Standard Series 5-Zone 55,000 BTU R-454B 208/230V (ES-55Z-M6C) need?
Published electrical requirements: 230 V voltage, 40 A minimum circuit ampacity, and 45 A maximum breaker or fuse sizing. Confirm the final circuit against the unit nameplate and local code with a licensed electrician.
How far can the outdoor unit be from the indoor head?
The published maximum line-set length is 262.4 ft, and the included line set comes pre-charged for 24.6 ft. Longer runs than the included set allows typically mean added refrigerant and a pro visit, so measure the planned routing before ordering.
What warranty does the ACiQ Multi-Zone Standard Series 5-Zone 55,000 BTU R-454B 208/230V (ES-55Z-M6C) carry?
The manufacturer publishes these warranty tiers: Standard: 7 yr parts / 12 yr compressor (published per-line ACiQ registration terms). Registration requirements and proof of qualified installation commonly affect coverage, so read the warranty terms before install day.

Data sources

Show
  1. ACiQ: ACiQ ES-55Z-M6C non-ducted multi-zone submittalSourced - manufacturer technical document

    Covers Frequency, Maximum breaker size, Maximum fuse size, Minimum circuit ampacity, Phase, Voltage and more

  2. ACiQ: ACiQ Multi-Zone Standard Series official categorySourced - manufacturer product page

    Covers Max indoor units, product_line.name

  3. AHRI certificate #216032388 - search the AHRI DirectorySourced - AHRI directory

    Covers AHRI certification number, performance_spec.cold_climate_designation, Rated cooling capacity, COP at 5F, EER2, Rated heating capacity and more

  4. ENERGY STAR: ENERGY STAR exact row check for AHRI 215735288Sourced - Energy Star listing

    Covers performance_spec.energy_star_cold_climate, Energy Star status

  5. ACiQ R454B Multi-Zone Compatibility ChartSourced - manual

    Covers Manual links

Last updated

Jul 29, 2026