Specifications

ManualsBrandsAirQuest ManualsCentral Air & Heating4 Ton 18 SEER 80% AFUE 135,000 BTU Gas Furnace and Air Conditioner System - Vertical

Specifications subject to change without notice.

421 51 5800 02 3/1/16

HIGH EFFICIENCY UP TO 19 SEER VARIABLE−SPEED AIR CONDITIONER

WITH OBSERVERr COMMUNICATING CONTROL SYSTEM

2 THRU 5 TONS SPLIT SYSTEM

208−230 Volt, 1−phase, 60 Hz

REFRIGERATION CIRCUIT

S Variable speed compressor operates at 5 stages with capacity range from

as wide as 25 − 100%

S High pressure switch

S Suction pressure transducer

S Pressure equalizer valve for easy starting

S Compressor discharge temperature sensor

S Coil temperature sensor

S Copper tube/aluminum fin coil

PERFORMANCE

S Up to 13.0 EER

S Integrated inverter control enables 5−stage operation with complete

Observer communicating system including Observer control

S Observer Wall Control with version 5.0 or newer software

required

S Also capable of 2−stage operation with 2−stage thermostat

S Self−configuring installation with Observer Communicating Wall Control

S Compact ECM fan motor driven by integrated inverter control

S Outdoor temperature sensor factory installed

S High−performance compressor sound shield standard

S Isolation compressor grommets

S Enhanced dehumidification

EASY TO INSTALL AND SERVICE

S Text based diagnostics with Observer Communicating Wall Control

S Only 2 control wires required from communicating indoor unit to

condenser

S External high and low refrigerant service ports

S Factory charged with R−410A refrigerant

S Adjustments for min and max staging with Observer Wall Control

BUILT TO LAST

S High gloss, baked−on powder coat finish over galvanized steel

S Post−painted (black) coil fins

S Coated inlet grille with 3/8” (10mm) spacing for extra protection (hail

guard)

S Corner posts for extra strength and style

WARRANTY*

S 10 year No Hassle Replacementt limited warranty

S 5 year parts limited warranty (including compressor and coil)

− With timely registration, an additional 5 year parts limited warranty

(including compressor and coil)

* For residential applications only. See Warranty certificate for complete

details and restrictions, including warranty coverage for other applications.

This product has been designed and manufactured to

meet ENERGY STAR criteria for energy efficiency when

matched with appropriate coil components. However,

proper refrigerant charge and proper air flow are critical

to achieve rated capacity and efficiency. Installation of

this product should follow the manufacturer’s refrigerant

charging and air flow instructions. Failure to confirm

proper charge and airflow may reduce energy efficiency

and shorten equipment life.

Use of the AHRI Certified TM Mark indicates a

manufacturer’s participation in the program. For

verification of certification for individual products,

go to www.ahridirectory.org .

Qualifying models only

Model

Number

Size

(tons)

Nominal

Btu/hr

Min. Circuit

Ampacity

Max. Fuse

or Breaker

Operating Dimensions

height x length/width (sq.) in. (mm)

Operating/Ship

Weight lbs. (kg)

HVA924GKA

2 24,000 13.5 20 31−13/16 x 23−1/8 (807 x 587) 128/150(58/68)

HVA925GKA

‡

2 24,000 23.6 40

38−1/2 x 23−1/8

(980 x 587)

152/177 (69/80)

HVA936GKA

3 36,000 24.2 40 152/177 (69/80)

HVA937GKA

‡

3 36,000 26.0 40

38−15/16 x 31−3/16

(989 x 792)

205/242 (93/110)

HVA948GKA 4 48,000 27.3 40 205/242 (93/110)

HVA949GKA

‡

4 48,000 26.0 40 43−11/16 x 35 (1111 x 889) 249/285 (113/129)

HVA960GKA

5 60,000 40.0 60 42−5/16 x 31−3/16 (1075 x 792) 229/268(104/121)

‡ = Meets Energy Star criteria when matched with appropriate coil

HVA9

Product Specifications

TSTAT0201CW

(Sold Separately)

Summary of content (30 pages)

PAGE 1
HVA9 ® Product Specifications HIGH EFFICIENCY UP TO 19 SEER VARIABLE−SPEED AIR CONDITIONER WITH OBSERVERr COMMUNICATING CONTROL SYSTEM 2 THRU 5 TONS SPLIT SYSTEM 208−230 Volt, 1−phase, 60 Hz REFRIGERATION CIRCUIT S Variable speed compressor operates at 5 stages with capacity range from as wide as 25 − 100% S High pressure switch S Suction pressure transducer S Pressure equalizer valve for easy starting S Compressor discharge temperature sensor S Coil temperature sensor S Copper tube/aluminum fin coil PE
PAGE 2
PRODUCT SPECIFICATIONS Split System Air Conditioner: HVA9 OUTDOOR UNIT MODEL NUMBER IDENTIFICATION GUIDE (single phase) Digit Position: Example Part Number: 1 2 3 4 5, 6 7 8 9 10 11 12 H V A 9 24 G K A 1 0 0 H = Airquest Mainline BRANDING V = Variable Speed KEY CHARACTERISTIC A = Air Conditioner H = Heat Pump TYPE 6 = 16 SEER 7 = 17 SEER 8 = 18 SEER 9 = 19 SEER NOMINAL EFFICIENCY 24 = 24,000 BTUH = 2 tons 25 = 24,000 BTUH = 2 tons 36 = 36,000 BTUH = 3 tons 37 = 36,000 BTUH = 3 t
PAGE 3
PRODUCT SPECIFICATIONS Split System Air Conditioner: HVA9 PHYSICAL DATA UNIT SIZE 24 25 36 37 48 49 60 SERIES Compressor Type Variable Speed Rotary REFRIGERANT R-410A Control TXV (R-410A Hard Shutoff) Charge lb (kg) 4.80 (2.18) 5.5 (2.50) 6.0 (2.72) 7.5 (3.40) 7.5 (3.40) 9.6 (4.35) 8.30 (3.
PAGE 4
PRODUCT SPECIFICATIONS Split System Air Conditioner: HVA9 COOLING CAPACITY LOSS TABLE Nominal Size (Btuh) 24 25 36 37 48 49 60 HVA9 Cooling Capacity Loss (%) Line OD (in.) 5/8 3/4 5/8 3/4 7/8 5/8 3/4 7/8 3/4 7/8 1 1/8 3/4 7/8 1 1/8 25 0.5 0.1 0.5 0.1 0.0 1.1 0.3 0.0 0.7 0.3 0.0 1.0 0.4 0.0 50 1.2 0.4 1.2 0.4 0.1 2.4 0.8 0.3 1.6 0.7 0.1 2.3 1.0 0.1 Total Equivalent Line Length (ft) 75 1.8 0.6 1.8 0.6 0.3 3.7 1.3 0.5 2.4 1.1 0.2 3.5 1.7 0.3 80 1.9 0.7 1.9 0.7 0.3 4.0 1.4 0.6 2.6 1.2 0.3 3.8 1.8 0.
PAGE 5
PRODUCT SPECIFICATIONS Split System Air Conditioner: HVA9 CHARGING SUBCOOLING (TXV−TYPE EXPANSION DEVICE) UNIT SIZE-VOLTAGE, SERIES 24 25 36 37 48 49 60 Subcooling recommendation displayed in Charging Mode the subcooling chart shown on the charging label must be followed RPM−CAPACITY−SOUND (dBA)* HVA924 1 2 3 4 5 1500 2566 3150 3950 4700 1 2 3 4 5 1200 1900 2400 2600 3300 1 2 3 4 5 1200 2400 3300 4200 4800 1 2 3 4 5 1200 1800 2200 2600 3000 1 2 3 4 5 1500 2460 2800 3650 4320 1 2 3 4 5 1200 18
PAGE 6
PRODUCT SPECIFICATIONS Split System Air Conditioner: HVA9 SOUND POWER LEVEL (dBA) Unit Size-Voltage, Series 24 25 36 37 48 49 60 Typical Octave Band Spectrum (without tone adjustment) Freq (Hz) 125 250 500 1000 2000 4000 8000 Sound Rating (dBA) Freq (Hz) 125 250 500 1000 2000 4000 8000 Sound Rating (dBA) Freq (Hz) 125 250 500 1000 2000 4000 8000 Sound Rating (dBA) Freq (Hz) 125 250 500 1000 2000 4000 8000 Sound Rating (dBA) Freq (Hz) 125 250 500 1000 2000 4000 8000 Sound Rating (dBA) Freq (Hz) 125
PAGE 7
Split System Air Conditioner: HVA9 421 51 5800 02 * = C, H, T DIMENSIONS − ENGLISH Representative drawing only, some models may vary in appearance. SD5337−4 REV C PRODUCT SPECIFICATIONS Specifications subject to change without notice.
PAGE 8
Split System Air Conditioner: HVA9 8 * = C, H, T DIMENSIONS − SI Representative drawing only, some models may vary in appearance. SD5337−4 REV C PRODUCT SPECIFICATIONS Specifications subject to change without notice.
PAGE 9
421 51 5800 02 Specifications subject to change without notice. Furnace Model Number 2 5 5 2 5 5 2 5 2 5 2 5 Stages 57,500 57,000 45,500 46,000 46,500 33,600 35,000 35,000 22,600 24,000 23,800 24,000 Cooling Capacity High 15.0 17.0 NOTE: Ratings contained in this document are subject to change at any time. * Ratings are net values reflecting the effects of circulating fan heat. Supplemental electric heat is not included.
PAGE 10
650 650 650 650 825 825 ID SCFM 14.01 12.64 11.71 11.67 13.95 12.66 12.55 12.53 16.60 15.01 13.88 13.48 16.54 14.98 14.42 14.40 23.43 21.30 19.74 18.74 23.36 21.24 19.96 19.93 6.30 9.35 11.62 11.67 9.39 12.32 12.55 12.53 7.18 10.22 12.59 13.48 10.24 13.23 14.42 14.40 9.90 13.70 16.69 18.74 13.70 17.45 19.96 19.93 Sens‡ 115 (46.1) Capacity MBtuh Total 1.38 1.39 1.39 1.39 1.38 1.39 1.39 1.39 1.72 1.72 1.71 1.71 1.72 1.72 1.72 1.72 2.85 2.81 2.78 2.76 2.85 2.81 2.78 2.78 Total Sys.
PAGE 11
COOLING INDOOR MODEL FCM4X24***L FCM4X36***L FCM4X48***L EA*4X24L14A* EA*4X24L17A* EA*4X24L17A* EA*4X24L17A* EA*4X30L14A* EA*4X30L17A* EA*4X30L17A* EA*4X30L17A* EA*4X36L14A* EA*4X36L17A* EA*4X36L17A* EA*4X36L17A* EA*4X36L17A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L21A* EA*4X48L17A* EA*4X48L17A* EA*4X48L17A* EA*4X48L17A* EA*4X48L21A* EA*4X48L21A* EA*4X48L21A* ENH4X24L17** ENH4X24L17** ENH4X24L17** ENH4X36L17** ENH4X36L17** ENH4X42L21** ENH4X42L21** ENH4X42L21** EN(A,D)4X24L1
PAGE 12
Specifications subject to change without notice. 650 650 650 650 825 825 ID SCF M 10.82 10.82 10.45 10.97 10.83 7.94 11.99 10.83 9.94 10.14 10.14 7.95 10.98 10.22 5.39 12.12 13.47 12.14 14.07 13.47 9.41 15.43 13.49 12.65 13.49 11.60 12.65 9.43 14.11 13.09 6.67 15.55 20.15 17.56 21.46 20.15 13.77 23.52 20.19 18.96 18.96 20.19 16.81 13.82 21.55 19.97 9.99 23.68 115 (46.1) Capacity MBtuh Sens Total ‡ 0.74 0.74 0.74 0.73 0.74 0.74 0.74 0.73 1.
PAGE 13
421 51 5800 02 Specifications subject to change without notice. 13 342 342 342 342 437 437 608 608 ID SCFM 9.35 7.53 10.69 9.35 6.17 11.79 8.60 8.81 8.82 9.88 7.24 6.18 9.90 1.29 3.18 10.72 9.35 7.53 10.69 9.35 6.17 11.79 8.60 8.81 8.82 9.88 7.24 6.18 9.90 2.59 6.36 10.72 12.51 10.11 14.14 12.51 8.23 15.55 11.59 11.80 11.80 13.11 9.74 8.25 14.19 13.12 6.37 15.62 16.12 13.69 17.42 15.91 10.84 19.12 16.12 15.18 15.18 16.26 13.13 17.48 16.
PAGE 14
COOLING INDOOR MODEL FCM4X48***L FCM4X36***L FCM4X60***L FCM4X24***L EA*4X24L14A* EA*4X24L17A* EA*4X24L17A* EA*4X24L17A* EA*4X30L14A* EA*4X30L17A* EA*4X30L17A* EA*4X30L17A* EA*4X36L14A* EA*4X36L17A* EA*4X36L17A* EA*4X36L17A* EA*4X36L17A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L24A* ENH4X24L17** ENH4X24L17** ENH4X24L17** ENH4X30L17** ENH4X30L17** ENH4X30L17** ENH4X36L17** ENH4X36L17** ENH4X36L17** ENH4X36L17** ENH4X42L21** ENH4X42L21
PAGE 15
421 51 5800 02 Specifications subject to change without notice. 800 800 900 900 1050 1050 ID SCFM 13.18 12.75 13.36 13.18 9.69 14.58 13.20 12.37 13.20 12.13 12.37 9.71 13.36 12.47 6.58 14.74 18.83 16.83 19.77 18.83 13.06 21.64 18.86 17.71 18.86 16.08 17.71 19.85 18.41 9.32 13.12 21.81 28.61 23.78 31.25 28.61 18.92 34.04 27.55 27.05 27.05 29.21 22.90 19.07 31.38 29.21 14.18 Sens‡ 34.24 Total Capacity MBtuh 115 (46.1) 0.98 0.98 0.98 0.97 0.
PAGE 16
Specifications subject to change without notice. 421 51 5800 02 417 417 417 417 566 566 812 812 ID SCFM 11.52 11.52 9.25 13.13 10.56 7.57 14.44 12.16 10.84 10.89 8.91 7.58 13.17 12.18 5.90 14.50 11.52 9.25 13.13 11.52 7.57 14.44 10.56 10.84 10.89 12.16 8.91 7.58 13.17 12.18 5.90 14.50 17.18 13.69 19.70 17.18 11.25 21.65 15.60 16.02 16.37 18.26 13.20 11.28 19.76 18.28 8.83 21.74 27.71 21.83 31.95 24.84 17.98 34.90 27.71 25.51 26.68 29.
PAGE 17
COOLING INDOOR MODEL FCM4X48***L FCM4X36***L FCM4X60***L FCM4X24***L EA*4X36L14A* EA*4X36L17A* EA*4X36L17A* EA*4X36L17A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L21A* EA*4X48L17A* EA*4X48L17A* EA*4X48L17A* EA*4X48L21A* EA*4X48L21A* EA*4X48L21A* EA*4X60L21A* ENH4X36L17** ENH4X36L17** ENH4X36L17** ENH4X42L21** ENH4X42L21** ENH4X42L21** ENH4X42L21** ENH4X42L21** ENH4X43L21** ENH4X43L21** ENH4X43L21** ENH4X48L21** ENH4X48L21** ENH4X48L21** ENH4X60L24** E
PAGE 18
Specifications subject to change without notice. 25.78 32.58 31.43 57 (13.9) 72 (22.2) 67 (19.4) 27.36 57 (13.9) 18.34 22.86 20.74 57 (13.9) 72 (22.2) 67 (19.4) 19.53 18.16 16.42 57 (13.9) 72 (22.2) 67 (19.4) 14.59 18.08 16.38 57 (13.9) 72 (22.2) 67 (19.4) 15.54 57 (13.9) 15.54 15.57 13.89 10.84 14.59 13.25 10.82 7.73 19.53 19.57 17.22 13.49 18.34 16.44 13.49 9.72 27.36 27.02 24.01 18.47 25.78 22.33 19.22 13.63 Sens‡ 1.99 1.99 1.98 1.96 1.99 1.
PAGE 19
421 51 5800 02 Specifications subject to change without notice. 19 417 417 500 500 566 566 812 812 ID SCFM 13.22 10.34 15.69 13.22 8.70 17.34 11.63 11.91 12.94 14.50 9.98 8.68 15.72 14.53 7.04 17.38 14.21 11.32 16.37 12.88 9.36 18.09 14.21 13.23 13.54 15.14 10.91 9.34 16.41 15.16 7.36 18.14 17.76 14.10 20.62 17.76 11.70 22.78 15.99 16.40 17.03 19.06 13.58 20.67 19.09 9.26 11.68 22.84 26.63 21.31 30.47 26.63 17.49 33.51 24.31 24.94 25.
PAGE 20
COOLING INDOOR MODEL FCM4X60***L FCM4X48***L EA*4X36L14A* EA*4X36L17A* EA*4X36L17A* EA*4X36L17A* EA*4X36L17A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X36L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L21A* EA*4X42L24A* EA*4X42L24A* EA*4X42L24A* EA*4X42L24A* EA*4X42L24A* EA*4X42L24A* EA*4X48L17A* EA*4X48L17A* EA*4X48L17A* EA*4X48L17A* EA*4X48L21A* EA*4X48L21A* EA*4X48L21A* EA*4X48L21A* EA*4X48L21A* EA*4X48L21A* EA*4X48L
PAGE 21
421 51 5800 02 Specifications subject to change without notice. 1100 1100 1200 1200 1400 1400 ID SCF M 22.21 20.20 23.13 22.21 15.59 25.31 22.25 20.89 22.25 19.30 20.89 15.65 23.22 21.57 10.99 25.50 25.52 22.96 26.71 25.52 17.78 29.22 25.56 24.03 25.56 21.96 24.03 17.86 26.82 24.93 12.62 29.42 37.36 31.14 40.84 37.36 24.79 44.60 36.06 35.29 35.29 38.13 29.97 24.95 40.99 38.13 18.57 44.82 115 (46.1) Capacity MBtuh Sens Total ‡ 2.21 2.21 2.21 2.
PAGE 22
Specifications subject to change without notice. 421 51 5800 02 662 662 662 662 744 744 1110 1110 ID SCFM 18.92 19.26 13.31 23.27 15.58 10.40 25.60 21.53 18.92 19.26 15.58 13.31 23.27 21.53 10.40 25.60 18.92 13.31 23.27 19.26 10.40 25.60 15.58 18.92 19.26 21.53 15.58 13.31 23.27 21.53 10.40 25.60 29.76 18.70 26.90 30.79 15.35 29.51 25.97 21.88 22.33 34.45 18.04 15.41 26.97 24.98 12.03 29.62 36.80 29.13 42.29 36.80 23.95 46.26 33.18 34.
PAGE 23
COOLING INDOOR MODEL FCM4X60***L FCM4X48***L EA*4X48L17A* EA*4X48L21A* EA*4X48L21A* EA*4X48L21A* EA*4X48L21A* EA*4X48L24A* EA*4X48L24A* EA*4X60L21A* EA*4X60L21A* EA*4X60L21A* EA*4X60L21A* EA*4X60L24A* EA*4X60L24A* ENH4X48L21** ENH4X48L21** ENH4X48L21** ENH4X48L21** ENH4X60L24** ENH4X60L24** ENH4X61L24** ENH4X61L24** EN(A,D,W)4X48L21** EN(A,D,W)4X48L21** EN(A,D,W)4X48L21** EN(A,D,W)4X48L21** EN(A,D)4X48L24** EN(A,D)4X48L24** EN(A,D,W)4X60L24** EN(A,D,W)4X60L24** EN(A,D,W)4X60L24** EN(A,D)4X61L24** EN(A,D)4X6
PAGE 24
72(22.2) 67(19.4) 63(17.2) 57(13.9) 72(22.2) 67(19.4) 63(17.2) 57(13.9) 72(22.2) 67(19.4) 63(17.2) 57(13.9) 72(22.2) 67(19.4) 63(17.2) 57(13.9) 72(22.2) 67(19.4) 63(17.2) 57(13.9) 72(22.2) 67(19.4) 63(17.2) 57(13.9) EWB °F (°C) 1100 1100 1100 1100 1200 1200 ID SCF M 25.50 22.96 21.09 20.31 25.40 22.89 21.83 21.79 31.71 28.66 26.39 24.76 31.60 28.56 26.51 26.43 43.98 39.97 37.01 33.82 43.85 39.86 36.99 35.89 10.93 15.35 18.80 20.31 15.42 19.78 21.83 21.79 13.28 18.08 21.83 24.76 18.13 22.
PAGE 25
1.03 1.06 1.00 0.98 0.95 0.99 0.99 0.96 0.96 0.96 0.98 0.99 0.97 0.99 0.99 1.01 0.99 0.98 0.98 0.98 1.00 0.99 1.03 1.01 1.00 0.99 1.00 0.99 1.00 1.01 0.96 0.99 0.99 0.99 0.99 0.97 0.98 0.98 1.00 0.99 0.98 0.99 0.98 1.01 1.00 0.99 0.99 0.99 0.99 1.00 1.00 1.00 1.00 1.00 0.99 1.
PAGE 26
Specifications subject to change without notice. 1200 1200 1350 1350 1600 1600 ID SCF M 22.44 20.16 23.79 22.44 15.84 26.55 22.48 20.91 22.48 19.14 20.91 15.71 23.86 21.85 11.34 26.64 30.02 26.01 32.39 30.02 20.59 35.82 30.04 28.14 30.07 24.83 28.14 20.54 32.49 29.95 15.07 35.94 45.62 37.37 50.50 45.62 30.04 55.24 43.10 43.16 43.16 47.09 36.00 30.18 50.63 47.11 22.79 55.38 115 (46.1) Capacity MBtuh Sens Total ‡ 1.89 1.89 1.89 1.89 1.88 1.
PAGE 27
421 51 5800 02 Specifications subject to change without notice. 748 748 959 959 1367 1367 ID SCFM 29.82 36.25 57.61 52.65 20.65 16.71 24.22 20.65 13.93 27.04 18.88 19.20 19.51 22.18 15.99 13.80 24.28 22.21 11.00 27.11 28.74 23.06 33.32 28.74 19.10 36.89 26.18 26.75 27.31 30.72 22.16 19.03 33.40 30.77 15.01 45.90 36.98 45.90 41.31 42.48 44.14 48.99 35.05 29.96 52.75 49.06 23.45 57.74 105 (40.5) Capacity MBtuh Total Sens‡ 2.20 2.20 2.21 2.21 2.
PAGE 28
COOLING INDOOR MODEL FCM4X60***L EA*4X60L21A* EA*4X60L21A* EA*4X60L21A* EA*4X60L21A* EA*4X60L24A* EA*4X60L24A* EA*4X60L24A* EA*4X60L24A* EA*4X60L24A* EA*4X60L24A* ENH4X60L24** ENH4X60L24** ENH4X60L24** ENH4X60L24** ENH4X60L24** ENH4X60L24** ENH4X61L24** ENH4X61L24** ENH4X61L24** ENH4X61L24** ENH4X61L24** ENH4X61L24** EN(A,D,W)4X60L24** EN(A,D,W)4X60L24** EN(A,D,W)4X60L24** EN(A,D,W)4X60L24** EN(A,D,W)4X60L24** EN(A,D,W)4X60L24** EN(A,D)4X61L24** EN(A,D)4X61L24** EN(A,D)4X61L24** EN(A,D)4X61L24** EN(A,D)
PAGE 29
PRODUCT SPECIFICATIONS Split System Air Conditioner: HVA9 GUIDE SPECIFICATIONS GENERAL — System Description Outdoor−mounted, air−cooled, split−system air conditioning unit suitable for ground or rooftop installation. Unit consists of a hermetic compressor, an air−cooled coil, forward−swept blade propeller−type condenser fan, and a control box. Unit will discharge supply air upward as shown on contract drawings. Unit will be used in a refrigeration circuit to match up to a packaged fan coil or coil unit.
PAGE 30
PRODUCT SPECIFICATIONS Split System Air Conditioner: HVA9 SYSTEM DESIGN SUMMARY 1. Intended for outdoor installation with free air inlet and outlet. Outdoor fan external static pressure available is less than 0.01−in. wc. 2. This product is not qualified for low ambient cooling operation. Minimum cooling outdoor operating temperatures: − Communicating systems: 40_F (4.44_C) − Non−communicating systems: 55_F (12.8_C) 3. For reliable operation, unit should be level in all horizontal planes. 4.