Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Packaged Terminal Air Conditioners
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## Water-source heat pumps that reject heat to a central condenser water loop are excluded and are covered by [[sync/water-source-heat-pumps]]; PTAC and PTHP equipment is air-source only. {note}
−## The fire damper or combination fire/smoke damper within the through-wall penetration, where required by the building's fire-resistance rating, is excluded and is covered by [[sync/fire-and-smoke-dampers]]; the sleeve and grille opening shall be coordinated with that standard. {note}
+## The fire damper or combination fire/smoke damper within the through-wall penetration, where required by the building's fire-resistance rating, is excluded and is covered by [[sync/fire-and-smoke-dampers]]; the sleeve and grille opening shall be coordinated with that standard.
## Central air-handling units, rooftop units, and packaged DX equipment serving ducted distribution are outside the scope of this standard. {note}
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# Quality Assurance {toc}
−## Equipment shall be the product of a manufacturer regularly engaged in the production of packaged terminal air conditioners and heat pumps for commercial hospitality and multifamily applications. {note}
+## Equipment shall be the product of a manufacturer regularly engaged in the production of packaged terminal air conditioners and heat pumps for commercial hospitality and multifamily applications.
## Each PTAC and PTHP chassis shall be listed to UL 60335-2-40.
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## Mode of Operation {toc}
−### The selected mode of operation shall match the heating strategy for the project's climate. A PTAC provides mechanical cooling and electric resistance heating only; it has no heat-pump heating and provides no heating at all unless a resistance heat module is furnished. A PTHP provides reverse-cycle heat-pump heating that is far more efficient at moderate outdoor temperatures, with resistance heat used only as supplemental and emergency backup at low outdoor temperatures. {note}
+### The selected mode of operation shall match the heating strategy for the project's climate. A PTAC provides mechanical cooling and electric resistance heating only; it has no heat-pump heating and provides no heating at all unless a resistance heat module is furnished. A PTHP provides reverse-cycle heat-pump heating that is far more efficient at moderate outdoor temperatures, with resistance heat used only as supplemental and emergency backup at low outdoor temperatures.
−### Specifying a PTAC without a resistance heat module in any climate that requires heating leaves the room with no heat source; the heating method and, for resistance heat, its kW rating shall be explicitly stated and never left blank. {note}
+### Specifying a PTAC without a resistance heat module in any climate that requires heating leaves the room with no heat source; the heating method and, for resistance heat, its kW rating shall be explicitly stated and never left blank.
```datasheet
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### Each unit shall be sized to meet the calculated room cooling load at the AHRI 310/380 rating condition of 95°F outdoor dry bulb and 80°F/67°F indoor dry-bulb/wet-bulb.
−### Standard-size chassis between 7,000 and 15,000 BTU/h cover the great majority of hotel and multifamily rooms; a typical 200 to 400 SF room falls in the 9,000 to 12,000 BTU/h range. {note}
−
```datasheet
label: Rated cooling capacity
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```
+### Standard-size chassis between 7,000 and 15,000 BTU/h cover the great majority of hotel and multifamily rooms; a typical 200 to 400 SF room falls in the 9,000 to 12,000 BTU/h range. {note}
+
## Minimum Efficiency {toc}
### Each unit shall meet or exceed the minimum efficiency required by DOE 10 CFR Part 431, Subpart F, and by ASHRAE 90.1 Table 6.8.1 as adopted by the jurisdiction, whichever is more stringent.
−### For standard-size cooling capacity between 7,000 and 15,000 BTU/h, the minimum cooling efficiency is EER ≥ 14.0 − (0.300 × Cap/1000), where Cap is the rated cooling capacity in BTU/h. For example, a 12,000 BTU/h unit shall provide EER ≥ 10.4. Units below 7,000 BTU/h shall provide EER ≥ 11.9; units above 15,000 BTU/h shall provide EER ≥ 9.3. {note}
+### For standard-size cooling capacity between 7,000 and 15,000 BTU/h, the minimum cooling efficiency is EER ≥ 14.0 − (0.300 × Cap/1000), where Cap is the rated cooling capacity in BTU/h. For example, a 12,000 BTU/h unit shall provide EER ≥ 10.4. Units below 7,000 BTU/h shall provide EER ≥ 11.9; units above 15,000 BTU/h shall provide EER ≥ 9.3.
### For PTHP equipment, the minimum heating efficiency at 47°F outdoor dry bulb is COPH ≥ 3.2 for standard-size units of 7,000 to 15,000 BTU/h, COPH ≥ 3.3 for units below 7,000 BTU/h, and COPH ≥ 2.9 for units above 15,000 BTU/h, all measured per AHRI 310/380. {note}
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### Supplemental electric resistance heat shall be furnished where the heating load cannot be met by the heat pump alone at the design outdoor temperature, or where a PTAC is selected and resistance heat is the sole heat source.
−### Resistance heat for a PTHP shall be controlled to operate only as supplemental and emergency backup.
−
−### Resistance heat for a PTHP shall not run simultaneously with the compressor heating mode except during defrost.
−
−### The 80% case for a standard hotel room is a 3.5 kW resistance heat module; mild southern climates may require no supplemental heat, and high-load or all-resistance applications may require 5.0 kW. {note}
−
```datasheet
label: Supplemental electric resistance heat
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```
+### Resistance heat for a PTHP shall be controlled to operate only as supplemental and emergency backup.
+
+### Resistance heat for a PTHP shall not run simultaneously with the compressor heating mode except during defrost.
+
+### The usual selection for a standard hotel room is a 3.5 kW resistance heat module; mild southern climates may require no supplemental heat, and high-load or all-resistance applications may require 5.0 kW. {note}
+
## Sound Ratings {toc}
−### PTAC and PTHP units installed in guest rooms and dwelling units shall meet a published low-fan-speed sound-pressure level not exceeding the value scheduled for the project; for typical hotel applications a target of ≤ 45 dB(A) at low fan speed is recommended. {note}
+### PTAC and PTHP units installed in guest rooms and dwelling units shall meet a published low-fan-speed sound-pressure level not exceeding the value scheduled for the project; for typical hotel applications a target of ≤ 45 dB(A) at low fan speed is recommended.
### The scheduled sound rating shall be the manufacturer's published A-weighted sound-pressure level at the corresponding fan speed; sound ratings shall not be omitted from the schedule.
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### The refrigerant type shall be specified in the unit schedule.
−### Where an A2L lower-GWP refrigerant is selected, the chassis shall be listed to UL 60335-2-40 for that refrigerant class and the manufacturer's A2L handling and charge-limit requirements shall be observed.
−
−### For new construction, R-32 or another A2L lower-GWP refrigerant should be specified to align with the DOE transition timeline.
−
−### Units ordered with R-410A may face rising servicing cost as the AIM Act phase-down tightens supply. {note}
−
```datasheet
label: Refrigerant type
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```
+### Where an A2L lower-GWP refrigerant is selected, the chassis shall be listed to UL 60335-2-40 for that refrigerant class and the manufacturer's A2L handling and charge-limit requirements shall be observed.
+
+### For new construction, R-32 or another A2L lower-GWP refrigerant should be specified to align with the DOE transition timeline.
+
+### Units ordered with R-410A may face rising servicing cost as the AIM Act phase-down tightens supply. {note}
+
# Electrical Service {toc}
## Service Voltage {toc}
−### The chassis electrical characteristics shall match the building's branch-circuit voltage. Specifying a 208/230 V chassis for a building wired at 265 V, or the reverse, is a common and avoidable RFI; the service voltage shall be confirmed with the Electrical Engineer of Record before the schedule is finalized. {note}
+### The chassis electrical characteristics shall match the building's branch-circuit voltage. Specifying a 208/230 V chassis for a building wired at 265 V, or the reverse, is a common and avoidable RFI; the service voltage shall be confirmed with the Electrical Engineer of Record before the schedule is finalized.
−### The most common service is 208/230 V, single phase, 60 Hz. A 265 V chassis is available for legacy high-rise hotels wired at 265 V. A 120 V chassis is limited to residential-grade units below 9,000 BTU/h. {note}
−
```datasheet
label: Electrical service voltage
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```
+### The most common service is 208/230 V, single phase, 60 Hz. A 265 V chassis is available for legacy high-rise hotels wired at 265 V. A 120 V chassis is limited to residential-grade units below 9,000 BTU/h. {note}
+
## Branch Circuit and Overcurrent Protection {toc}
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### Each unit and its branch circuit shall be grounded in accordance with NEC Article 250.
−### Branch circuits for PTAC and PTHP units are typically 20 A or 30 A; the rating shall be selected to match the unit MCA and shall never exceed the unit MOCP. {note}
+### Branch circuits for PTAC and PTHP units are typically 20 A or 30 A; the rating shall be selected to match the unit MCA and shall never exceed the unit MOCP.
```datasheet
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## Sleeve Selection and Compatibility {toc}
−### PTAC chassis and sleeves are not dimensionally universal across manufacturers; for example, common sleeve widths differ by brand. For replacement work, the existing sleeve brand and interior dimensions shall be verified before a replacement chassis is selected, or a universal-fit retrofit chassis shall be specified. {note}
+### PTAC chassis and sleeves are not dimensionally universal across manufacturers; for example, common sleeve widths differ by brand. For replacement work, the existing sleeve brand and interior dimensions shall be verified before a replacement chassis is selected, or a universal-fit retrofit chassis shall be specified.
−### For new construction the wall sleeve shall be the industry-standard 42 in. wide × 16 in. high opening with an integral rear louver, unless a non-standard size is required by the existing wall condition. {note}
+```datasheet
+label: Chassis-to-sleeve compatibility
+type: radio
+options:
+ - Brand-matched chassis (new sleeve)
+ - Universal-fit retrofit chassis (existing sleeve)
+default: Brand-matched chassis (new sleeve)
+```
+### For new construction the wall sleeve shall be the industry-standard 42 in. wide × 16 in. high opening with an integral rear louver, unless a non-standard size is required by the existing wall condition.
+
### The wall sleeve shall be galvanized or otherwise corrosion-resistant steel and shall be sized for the selected chassis with the manufacturer's required clearances.
−### Sleeve depth shall match the wall construction thickness, typically 13 to 16 in., so that the exterior grille sits flush with the finished exterior face. {note}
+### Sleeve depth shall match the wall construction thickness, typically 13 to 16 in., so that the exterior grille sits flush with the finished exterior face.
```datasheet
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### For replacement projects within a portfolio of mixed legacy sleeves, a universal-fit retrofit chassis sized to the existing sleeve opening should be specified to avoid sleeve replacement and brand lock-in. {note}
−```datasheet
−label: Chassis-to-sleeve compatibility
−type: radio
−options:
− - Brand-matched chassis (new sleeve)
− - Universal-fit retrofit chassis (existing sleeve)
−default: Brand-matched chassis (new sleeve)
−```
−
## Exterior Grille and Interior Cover {toc}
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### An interior decorative cover panel shall be furnished where the chassis face is exposed within the occupied room; the finish shall be as scheduled.
−### The grille and sleeve opening shall be coordinated with the fire/smoke damper requirements of [[sync/fire-and-smoke-dampers]] where the wall carries a fire-resistance rating. {note}
+### The grille and sleeve opening shall be coordinated with the fire/smoke damper requirements of [[sync/fire-and-smoke-dampers]] where the wall carries a fire-resistance rating.
```datasheet
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## Structural Coordination {toc}
−### A through-wall sleeve penetration in masonry, concrete masonry unit, or concrete wall construction requires a structural lintel or header above the opening; the opening and its support shall be coordinated with the structural drawings. {note}
+### A through-wall sleeve penetration in masonry, concrete masonry unit, or concrete wall construction requires a structural lintel or header above the opening; the opening and its support shall be coordinated with the structural drawings.
### The sleeve opening location, size, and required lintel or header shall be shown on the drawings. [[drawing: sleeve opening and lintel]]
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## The fresh-air provision shall satisfy the minimum outdoor-air ventilation rate required by ASHRAE 62.1 for the occupancy, typically 15 to 20 CFM per person for single-occupancy hotel and dwelling rooms. {note}
−## A fixed-open fresh-air damper fails ASHRAE 90.1 and equivalent state energy codes in many jurisdictions because it admits unconditioned outdoor air continuously; a motorized auto-close damper coordinated with the room control sequence is the 80% case for energy compliance. {note}
+## A fixed-open fresh-air damper fails ASHRAE 90.1 and equivalent state energy codes in many jurisdictions because it admits unconditioned outdoor air continuously; a motorized auto-close damper coordinated with the room control sequence is the usual arrangement for energy compliance. {note}
## The fresh-air damper type shall be coordinated with the adopted energy code and with the room occupancy control sequence so that outdoor air is admitted only when required and the damper closes on unoccupied setback.
−## Where the project ventilation strategy requires more outdoor air than a damper can provide, a unit with an integrated fresh-air or dedicated-outdoor-air module may be specified to meet ASHRAE 62.1 without a separate energy-recovery ventilator. {note}
−
```datasheet
label: Fresh-air damper type
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```
+## Where the project ventilation strategy requires more outdoor air than a damper can provide, a unit with an integrated fresh-air or dedicated-outdoor-air module may be specified to meet ASHRAE 62.1 without a separate energy-recovery ventilator. {note}
+
+## The minimum outdoor-air ventilation rate for each unit shall be specified, sized to meet the project's ventilation strategy and ASHRAE 62.1 requirements.
+
```datasheet
label: Minimum outdoor-air ventilation rate
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## The sleeve shall be set with a positive slope of not less than 1/4 in. toward the exterior face.
−## The condensate disposal method shall be selected to match the installation: gravity drain to the exterior through the sloped sleeve is standard; a condensate evaporator (slinger) chassis eliminates the exterior drip where it is objectionable; and a condensate pump may be used where an internal drain connection is required. {note}
+## The condensate disposal method shall be selected to match the installation: gravity drain to the exterior through the sloped sleeve is standard; a condensate evaporator (slinger) chassis eliminates the exterior drip where it is objectionable; and a condensate pump may be used where an internal drain connection is required.
```datasheet
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# Controls {toc}
−## The control interface shall be coordinated with the building's room-control strategy. Hotel energy management systems commonly use proprietary protocols; specifying a chassis without a compatible control interface results in stand-alone operation with no occupancy-based setback. {note}
+## The control interface shall be coordinated with the building's room-control strategy. Hotel energy management systems commonly use proprietary protocols; specifying a chassis without a compatible control interface results in stand-alone operation with no occupancy-based setback.
## Where the project uses a centralized energy management system or building automation system, the unit shall be furnished with a control interface compatible with that system, including any required PTAC interface (PTI) accessory or BACnet/Modbus connectivity.
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default: 100
```