air cooled split system condensing unit for rooftop ......performance data performance...

Engineered for flexibility and performance™

Air Cooled Split System Condensing Unitfor Rooftop Systems and Air Handlers Catalog 1702

Model RCS 06E to 20E6.5 to 20 TonsR22 Refrigerant

15 – 20 Tons

6.5 – 7.5 Tons

10 – 12 Tons

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Why Use a High Efficiency, Air CooledSplit System?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Agency Listed . . . . . . . . . . . . . . . . . . . . . . . . . . 3Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . 3

McQuay’s Unique Features . . . . . . . . . . . . . . . . . . 4Durable construction . . . . . . . . . . . . . . . . . . . . . . 4Condenser fans. . . . . . . . . . . . . . . . . . . . . . . . . . 4Scroll compressors . . . . . . . . . . . . . . . . . . . . . . . 4Condenser coils . . . . . . . . . . . . . . . . . . . . . . . . . 4

Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Base Pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Compressors . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Condenser Coil . . . . . . . . . . . . . . . . . . . . . . . . . 5Refrigerant Connections . . . . . . . . . . . . . . . . . . 5Crankcase Heaters . . . . . . . . . . . . . . . . . . . . . . 5Low Ambient Control . . . . . . . . . . . . . . . . . . . . . 5Service Valves. . . . . . . . . . . . . . . . . . . . . . . . . . 5Service Access . . . . . . . . . . . . . . . . . . . . . . . . . 5Condensing Section. . . . . . . . . . . . . . . . . . . . . . 5High Pressure Control . . . . . . . . . . . . . . . . . . . . 5Low Pressure Control . . . . . . . . . . . . . . . . . . . . 5Condenser Fan Motors . . . . . . . . . . . . . . . . . . . 5Equipment Ground. . . . . . . . . . . . . . . . . . . . . . . 5Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

General Rooftop Applications . . . . . . . . . . . . . . . . 6Unit Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Service Clearance. . . . . . . . . . . . . . . . . . . . . . . 6Unit Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Physical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7Unit Capacity and Physical Data. . . . . . . . . . . . . . 7

Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . 8Condensing Unit—Gross Capacity and Power . . . 8

Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . 13Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Power Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . 16

Engineering Guide Specification. . . . . . . . . . . . . 18Part 1: General . . . . . . . . . . . . . . . . . . . . . . . . . . 18

1.01 Summary: . . . . . . . . . . . . . . . . . . . . . . . . . 181.02 References . . . . . . . . . . . . . . . . . . . . . . . . 181.03 Submittals. . . . . . . . . . . . . . . . . . . . . . . . . 181.04 Qualifications . . . . . . . . . . . . . . . . . . . . . . 181.05 Delivery and Handling . . . . . . . . . . . . . . . 181.06 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . 181.07 Maintenance. . . . . . . . . . . . . . . . . . . . . . . 18

Part 2: Products . . . . . . . . . . . . . . . . . . . . . . . . . 182.01 Acceptable Manufacturers . . . . . . . . . . . . 182.02 Unit Description . . . . . . . . . . . . . . . . . . . . 182.03 Design Requirements . . . . . . . . . . . . . . . . 182.04 Condensing Section (Scroll) . . . . . . . . . . . 182.05 Controls . . . . . . . . . . . . . . . . . . . . . . . . . . 192.06 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Part 3: Execution. . . . . . . . . . . . . . . . . . . . . . . . . 193.01 Installation . . . . . . . . . . . . . . . . . . . . . . . . 193.02 Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Introduction
Introduction
Why Use a High Efficiency, Air CooledSplit System?• The size ranges offered by McQuay allow you to mix or

match components to meet actual job requirements, thus eliminating the need to use oversized or undersized equipment. Equipment sized to meet the actual load will provide better operating economy, better humidity control, and longer equipment life.

• With an air cooled system, you have no water or sewer connections to make, and no troublesome or costly water treatment problems.

• Since the condensing unit is located outside the building, and the low profile air handling unit can be installed in the drop ceiling or in the conditioned space, you will not need a separate equipment room which takes up valuable building space.

• Remote mounting of the already quiet condensing unit keeps the compressor and condenser fan noise outside. Vertical discharge fans also contribute to quietness, carrying the noise up and away from the surrounding area.

• Because of the simple design of the McQuay condensing unit, installation is quick, simple, and very little maintenance is required.

Agency Listed

Nomenclature

Rooftop Condensing System RefrigerantE = R22

R C S – 06 – E

Nominal capacity (tons)06 = 6.507 = 7.510 = 1012 = 1215 = 1520 = 20

McQuay Cat 1702 3

Introduction

McQuay’s Unique Features

Durable construction

• Pre-painted exterior cabinet panels pass 1000-hour ASTM B 117 Salt Spray Test for durability

Side/End View

End View

Top View

Condenser fans

• Vertical air discharge for quiet operation

Scroll compressors

• Provide maximum dependability, efficiency and quiet operation

Condenser coils

• Large face area

• High efficiency enhanced copper tubing

• All aluminum fin design

4 McQuay Cat 1702

Introduction

Components

Cabinet• Galvanized steel with powder coat paint finish. The powder

coat paint finish is high gloss, durable and capable of withstanding a 1000 hour salt spray test per ASTM B117.

• Unit is of the frame and panel type construction which allows all access panels to be opened or removed without affecting the structural strength of the unit.

• Fastening screws are also of the 1000 hour type.

• Stamped louver panels offer 100% protection for the condenser coil.

Base Pan• Galvanized steel with powder coat paint finish.

Compressors

• High efficiency Copeland® scroll compressors.

• Engineered for long life and durability.

• Unloading (50%) is available on 10 to 20 ton models.

• All compressors have inherent high temperature protection.

• Mounted on isolators which reduce vibration and noise.

Condenser Coil• Constructed with copper tubes and aluminum fins and

mechanically bonded to the tubes for maximum heat transfer capabilities.

• Condenser coil assemblies are leak tested up to 450 psig internal pressure.

Refrigerant Connections• Field sweat joints are made external of the unit and are

located close to the ground for a neat looking installation.

Crankcase Heaters• Standard on l0 – 20 ton models. Not available on 6.5 and 7.5

ton models.

Low Ambient Control• Pressure sensitive fan cycling control allows operation down

to 0°F [-17.8°C].

Service Valves• Standard on liquid line for all models. Optional suction line

service valves are available.

Service Access• Control box with separate line and control voltages, as well

as compressor and other refrigerant controls are accessible through access panels.

• Electrical access cover may be opened or removed without affecting normal operation of the unit.

• Condenser fan motors have molded plugs for easy removal.

• Removable louver panels/end access panel for coil cleaning.

Condensing Section• Open design permits unrestricted condenser airflow, access

to compressors, refrigeration components, piping, and access for roof maintenance.

• High efficiency Copeland® scroll compressors.

• 10 – 20 ton units feature tandem compressors for redundancy and efficient capacity control.

• Large face area condenser for high operating efficiencies.

• Vertical air discharge minimizes noise.

High Pressure Control• Manual reset control deactivates system (opens contactor

circuit) if abnormally high pressure occurs.

Low Pressure Control• Automatic reset control deactivates system if abnormally

low pressure or refrigerant loss occurs.

Condenser Fan Motors• Direct drive, single-phase, permanently lubricated “PSC”

motors with inherent thermal overload.

Equipment Ground• Lug for field connection of ground wire.

Testing• All units are run-tested at the factory prior to shipment.

Units are shipped with a nitrogen holding charge.

Accessories

Accessories (Table 1) can be added to further enhance the unit.Table 1: Accessories

Accessory description Model number Sizes used onAnti-short cycle timer kit RXAT-A01 All

Sight glass RXAG-A048 6.5 – 15 tonSight glass RXAG-A020 20 ton

Liquid line solenoid valve RXAV-BD048 AllSuction line service valve RXMV-AC 6.5 and 7.5 tonSuction line service valve RXMV-AD 10 and 12 tonSuction line service valve RXMV-AE 15 and 20 ton

McQuay Cat 1702 5

Application Data
Application Data
General Rooftop Applications

Units are intended for use in normal heating, ventilating, and air conditioning applications. Consult your local McQuay sales representative for applications involving operation at high ambient temperatures, high altitudes, non-cataloged voltages, and for job specific unit selections that fall outside of the range of the catalog tables.

For proper operation, units should be rigged in accordance with instructions stated in IM 909 (6.5 to 7.5 ton units) and IM 910 (10 to 20 ton units). Follow factory check, test and start procedures explicitly to achieve satisfactory start-up and operation (refer to IM 909 and IM 910).

Unit Location

A structural engineer must verify that the roof has adequate strength and ability to minimize deflection.

Unit condenser coils should be located in an area that will avoid contact with any heated exhaust air.

Allow sufficient space around the unit for maintenance/service clearance. Refer to Figure 1 for recommended clearances. Consult your McQuay sales representative if available clearances do not meet minimum recommendations. Where code considerations (such as the NEC) require extended clearances, those codes take precedence.

Service Clearance

Allow recommended service clearances for units as shown in Figure 1. Provide a roof walkway along the sides of the unit for service and access to controls and components. Contact your McQuay sales representative for service requirements less than those recommended.

Figure 1: RCS 06E – 20E Service Clearances

Unit Wiring

All units require three phase, 60 Hz, 208/230, 230, 460, or 575 volt power supply. All units include branch circuits and short circuit protection and are available with a power block.

All wiring must be installed in accordance with the National Electric Code (NEC) and local codes.

Building Edge

Control Panel/Piping Side

36

in.

Min

. 36 in. M

in.

24 in. Min.

24 in. Min.

6 McQuay Cat 1702

Physical Data
Physical Data
Unit Capacity and Physical DataTable 2: RCS 06E – 20E

ModelRCS

06E 07E 10E 12E 15E 20ECapacity and WeightCapacity (tons) [kW] 6.5 [22.9] 7.5 [26.4] 10 [35.2] 12.5 [44.0] 15 [52.8] 20 [70.3]Refrigerant charge R22 oz. [g] 262 [7428] 262 [7428] 309 [8760] 413 [11,708] 573 [16,244] 778 [22,056]Operating weight 266 [120.7] 330 [149.7] 569 [258.1] 640 [290.3] 819 [371.5 945 [428.6]Shipping weight 289 [131.1] 353 [160.1] 609 [276.2] 680 [308.4] 859 [389.6] 985 [446.8]CompressorQuantity 1 1 2 2 2 2Type Scroll Scroll Scroll Scroll Scroll ScrollRPM 3500 3500 3500 3500 3500 3500Condenser FansQuantity 1 1 2 2 3 3CFM [L/s] 3500 [1652] 3800 [1793] 6600 [3115] 6600 [3115] 9900 [4672] 9900 [4672]Diameter (in.) [mm] 24 [610] 24 [610] 24 [610] 24 [610] 24 [610] 24 [610]Drive Direct Direct Direct Direct Direct DirectMotor horsepower each [W] 1/3 [249] 1/3 [249] 1/3 [249] 1/3 [249] 1/3 [249] 1/3 [249]Type PSC PSC PSC PSC PSC PSCRPM 1075 1075 1075 1075 1075 1075Condenser CoilQuantity 1 1 2 2 2 2Rows 1 1/2 2 2 2 2 2Fins per inch 20 22 18 22 18 18Sq. ft. [m2] 22.2 [3] 22.2 [3] 27 [2.508] 32.875 [3.054] 40.375 [3.751] 40.375 [3.571]Fins/tubes Aluminum/CopperRefrigerant ConnectionVapor sweat #: in. [mm] 1: 1-1/8 [29] 1: 1-1/8 [29] 1: 1 3/8 [35] 1: 1 3/8 [35] 1: 1 5/8 [41] 1: 1 5/8 [41]Liquid sweat #: in. [mm] 1: 1/2 [13] 1: 1/2 [13] 1: 5/8 [16] 1: 5/8 [16] 1: 5/8 [16] 1: 7/8 [22]CabinetFinish Powder CoatSheet metal GalvanizedGauge (nominal) top 20 20 20 20 20 20Sides 20 20 20 20 20 20Base rails 14 14 14 14 14 14Package dimensionsHeight (in.) [mm] 32.8 [833] 32.8 [833] 44.8 [1137] 44.8 [1137] 44.8 [1137] 44.8 [1137]Width (in.) [mm] 31.1 [789] 31.1 [789] 38.4 [975] 38.4 [975] 38.4 [975] 38.4 [975]Length (in.) [mm] 43.0 [1092] 43.0 [1092] 60.5 [1537] 73.9 [1877] 83.875 [2130] 83.875 [2130]

McQuay Cat 1702 7

Performance Data
Performance Data
Condensing Unit—Gross Capacity and Power

Table 3: RCS 06E

Table 4: RCS 07E

Table 5: RCS 10E

* kW = compressor + condenser fan(s).

Outdoor Ambient Temp.°F [°C]

RCS 06E

Saturated Evaporator Temperature °F [°C]

40 [4] 45 [7] 50 [10]

MBh [kW] kW* MBh [kW] kW MBh [kW] kW

75 [24] 76.2 [22.33] 5.2 85.7 [25.12] 5.4 94.2 [27.61] 5.880 [27] 74.0 [21.69] 5.4 82.6 [24.21] 5.6 91.5 [26.82] 6.085 [29] 71.7 [21.01] 5.6 80.7 [23.65] 5.9 88.7 [26.00] 6.290 [32] 69.5 [20.37] 5.8 78.2 [22.92] 6.1 86.0 [25.20] 6.695 [35] 67.2 [19.69] 6.0 75.6 [22.16] 6.3 83.2 [24.38] 6.7100 [38] 64.9 [19.02] 6.2 73.1 [21.42] 6.6 80.5 [23.59] 6.9105 [41] 62.6 [18.35] 6.3 70.5 [20.66] 6.8 77.7 [22.77] 7.2110 [43] 60.4 [17.70] 6.5 68.0 [19.93] 7.0 75.1 [22.01] 7.3115 [46] 58.2 [17.06] 6.7 65.4 [19.17] 7.2 72.3 [21.19] 7.6


RCS 07E


40 [4] 45 [7] 50 [10]


75 [24] 87.5 [25.64] 6.0 96.8 [28.37] 6.2 106.0 [31.07] 6.580 [27] 84.8 [24.85] 6.2 94.0 [27.55] 6.5 102.6 [30.07] 6.985 [29] 82.0 [24.03] 6.4 91.2 [26.73] 6.8 99.5 [29.16] 7.190 [32] 79.2 [23.21] 6.6 88.0 [25.79] 7.0 96.8 [28.37] 7.495 [35] 76.5 [22.42] 6.9 84.8 [24.85] 7.3 94.0 [27.55] 7.6100 [38] 73.7 [21.60] 7.1 82.0 [24.03] 7.6 90.3 [26.46] 8.0105 [41] 71.0 [20.81] 7.4 79.2 [23.21] 7.8 86.6 [25.38] 8.2110 [43] 68.2 [19.99] 7.6 76.0 [22.27] 8.1 83.4 [24.44] 8.6115 [46] 65.4 [19.17] 7.9 72.8 [21.34] 8.3 80.2 [23.50] 8.8


RCS 10E


40 [4] 45 [7] 50 [10]


75 [24] 132.1 [38.71] 8.1 144.8 [42.44] 8.3 157.5 [46.16] 8.580 [27] 128.3 [37.60] 8.6 141.0 [41.32] 8.8 153.7 [45.05] 9.085 [29] 124.4 [36.46] 9.0 137.1 [40.18] 9.2 149.8 [43.90] 9.490 [32] 120.5 [35.32] 9.5 133.2 [39.04] 9.7 145.9 [42.76] 9.995 [35] 116.7 [34.20] 10.0 129.4 [37.92] 10.2 142.1 [41.65] 10.4100 [38] 112.8 [33.06] 10.5 125.5 [36.78] 10.7 138.2 [40.50] 10.9105 [41] 108.9 [31.92] 11.0 121.6 [35.64] 11.2 134.3 [39.36] 11.4110 [43] 105.1 [30.80] 11.5 117.8 [34.52] 11.7 130.5 [38.25] 11.9115 [46] 101.2 [29.66] 11.9 113.9 [33.38] 12.1 126.6 [37.10] 12.4

8 McQuay Cat 1702

Performance Data

Table 6: RCS 12E

Table 7: RCS 15E

Table 8: RCS 20E

* kW = compressor + condenser fan(s).


RCS 12E


40 [4] 45 [7] 50 [10]


75 [24] 153.1 [44.87] 10.2 170.2 [49.88] 10.5 187.3 [54.89] 10.980 [27] 148.1 [43.40] 10.9 165.2 [48.42] 11.2 182.4 [53.46] 11.585 [29] 143.1 [41.94] 11.5 160.3 [46.98] 11.8 177.4 [52.00] 12.190 [32] 138.2 [40.50] 12.1 155.3 [45.51] 12.4 172.4 [50.53] 12.795 [35] 133.2 [39.04] 12.7 150.4 [44.08] 13.0 167.5 [49.09] 13.3

100 [38] 128.3 [37.60] 13.4 145.4 [42.61] 13.7 162.5 [47.62] 14.0105 [41] 123.3 [36.14] 14.0 140.5 [41.18] 14.3 157.6 [46.19] 14.6110 [43] 118.4 [34.70] 14.6 135.5 [39.71] 14.9 152.6 [44.72] 15.2115 [46] 113.4 [33.23] 15.2 130.5 [38.25] 15.5 147.7 [43.29] 15.8


RCS 15E


40 [4] 45 [7] 50 [10]


75 [24] 198.7 [58.23] 13.7 207.1 [80.70] 14.0 215.5 [63.16] 14.480 [27] 195.6 [57.32] 14.4 204.1 [59.82] 14.7 212.5 [62.28] 15.185 [29] 192.6 [56.45] 15.1 201.1 [58.94] 15.5 209.5 [61.40] 15.890 [32] 189.6 [55.57] 15.8 198.1 [58.06] 16.2 206.5 [60.52] 16.595 [35] 186.6 [54.69] 16.5 195.1 [57.18] 16.9 203.5 [59.64] 17.2

100 [38] 183.6 [53.81] 17.2 192.1 [56.30] 17.6 200.5 [58.76] 17.9105 [41] 180.6 [52.93] 17.9 189.1 [55.42] 18.3 197.5 [57.88] 18.6110 [43] 177.6 [52.05] 18.6 186.1 [54.54] 19.0 194.5 [57.00] 19.3115 [46] 174.6 [51.17] 19.3 183.1 [53.66] 19.7 191.5 [56.12] 20.1


RCS 20E


40 [4] 45 [7] 50 [10]


75 [24] 276.3 [80.98] 18.2 312.7 [91.64] 19.0 349.1 [102.3] 19.780 [27] 264.3 [77.46] 18.9 300.7 [88.13] 19.7 337.2 [98.82] 20.485 [29] 252.3 [73.94] 19.6 288.8 [84.64] 20.4 325.2 [95.31] 21.190 [32] 240.3 [70.42] 20.3 276.8 [81.12] 21.1 313.2 [91.79] 21.995 [35] 228.4 [66.94] 22.0 264.8 [77.61] 22.4 301.2 [88.27] 22.8

100 [38] 216.4 [63.42] 22.7 252.8 [74.09] 23.1 289.2 [84.76] 23.5105 [41] 204.4 [59.90] 23.5 240.8 [70.57] 23.8 277.3 [81.27] 24.2110 [43] 192.4 [56.39] 24.2 228.9 [67.08] 24.5 265.3 [77.75] 24.9115 [46] 180.5 [52.90] 24.9 216.9 [63.57] 25.2 253.3 [74.23] 25.6

McQuay Cat 1702 9

Performance Data

Table 9: RCS 06E R22 Unit Capacities


40

50

60

70

80

90

100

35 40 45 50

Saturated Suction Temperature

Cap

acit

y at

Eva

po

rato

r

80°85°

95°

105°

115°

50

60

70

80

90

100

110

35 40 45 50


Cap

acit

y at

Eva

po

rato

r

80°85°

95°

105°

115°

10 McQuay Cat 1702

Performance Data



80

90

100

110

120

130

140

150

160

35 40 45 50


Cap

acit

y at

Eva

po

rato

r80°85°

95°

105°

115°

90

100

110

120

130

140

150

160

170

180

190

35 40 45 50


Cap

acit

y at

Eva

po

rato

r

80°85°

95°

105°

115°

McQuay Cat 1702 11

Performance Data



160

170

180

190

200

210

220

35 40 45 50


Cap

acit

y at

Eva

po

rato

r

80°85°

95°

105°

115°

140

165

190

215

240

265

290

315

340

365

35 40 45 50


Cap

acit

y at

Eva

po

rato

r

80°85°

95°

105°

115°

12 McQuay Cat 1702

Dimensional Data
Dimensional Data
Figure 2: RCS 06E and 07E Dimensions and Weights

Table 15: RCS 06E and 07E Operating Weights

Figure 3: RCS 10E Dimensions and Weights

Table 16: RCS 10E Operating Weights

RCS model

Total weight lbs. [kg]

Corner weight lbs. [kg]A B C D

06E 266 [121] 45 [20.41] 66 [29.94] 63 [28.58] 91 [41.28]07E 330 [150] 55 [24.95] 87 [39.46] 73 [33.11] 116 [52.62]

31.0643.00

32.81

CONTROL

PANEL ACCESS

SUCTIONLINE 1 LIQUID

LINE1/2"

1/8"

HIGH VOLTAGE3/4"DIA. HOLE1

LOW VOLTAGE7/8"DIA. HOLE

21.69

24.1926.6328.44

C

AD

B

RCS model



10E 569 [258.1] 140 [63.5] 150 [68.0] 135 [61.2] 144 [65.3]

A

B

D

C

CONTROL

PANEL ACCESS

62.14

39.94

McQuay Cat 1702 13

Dimensional Data

Figure 4: RCS 12E Dimensions and Weights

Table 17: RCS 12E Operating Weights

Figure 5: RCS 15E – 20E Dimensions and Weights

Table 18: RCS 15E and 20E Operating Weights

RCS model



12E 640 [290.2] 167 [75.7] 163 [73.9] 140 [63.5] 170 [77.1]

B

A

C

D

CONTROL

PANEL ACCESS

75.54

39.94

RCS model



15E 818 [371.0] 211 [75.7] 198 [89.8] 211 [95.7] 198 [89.8]20E 945 [428.6] 238 [108.0] 246 [111.6] 235 [106.6] 227 [103.0]

A

D

C

B

CONTROL

PANEL ACCESS

85.52

39.94

14 McQuay Cat 1702

Electrical Data
Electrical Data
Power WiringTable 19: RCS 06E and 07E Electrical Data

Table 20: RCS 10E and 12E Electrical Data

Table 21: RCS 15E and 20E Electrical Data

ModelRCS

06E 07ECompressor MotorElectrical characteristics 208/230-3-60 460-3-60 575-3-60 208/230-3-60 460-3-60 575-3-60Operating CurrentRated load amps (each) 18.6 9 7.4 25.6 12.8 8.7Locked rotor amps (each) 156 75 54 196 100 90Condenser Fan MotorsVolt and phase 208/230-1-60 460-1-60 575-1-60 208/230-1-60 460-1-60 575-1-60Full load amps (each) 2.4 1.4 1 2.4 1.4 1System characteristicsUnit full load amps 21.0 10.4 8.4 28.0 14.2 9.7Minimum fuse size (amps) or HACR circuit breaker ampacity

30 15 15 45 25 15

Minimum circuit ampacity 25 13 11 35 18 12Maximum fuse size (amps) or HACR circuit breaker ampacity

40 20 15 50 30 20

Disconnect size 30 30 30 60 30 30

ModelRCS

10E 12ECompressor MotorElectrical characteristics 208/230-3-60 460-3-60 575-3-60 208/230-3-60 460-3-60 575-3-60Operating CurrentRated load amps (each) 17.3/17.3 9.0 7.1 18.6/18.6 9.0 7.4Locked rotor amps (each) 137 62 50 156 75 54Condenser Fan MotorsVolt and phase 208/230-1 460-1 575-1 208/230-1 460-1 575-1Full load amps (each) 2.4 1.4 1 2.4 1.4 1System characteristicsUnit full load amps 39.4 20.7 16.1 42.0 20.7 16.7Minimum fuse size (amps) or HACR circuit breaker ampacity

50 30 20 55 30 25


60 30 25 60 35 25


ModelRCS

15E 20ECompressor MotorElectrical characteristics 208/230-3-60 460-3-60 575-3-60 208/230-3-60 460-3-60 575-3-60Operating CurrentRated load amps (each) 28.8/28.8 14.7 10.8 37.2/37.2 17.2 12.4Locked rotor amps (each) 195 95 80 239 125 80Condenser Fan MotorsVolt and phase 208/230-1 460-1 575-1 208/230-1 460-1 575-1Full load amps (each) 2.4 1.4 1 2.4 1.1 0.8System characteristicsUnit FLA 64.9 33.7 24.5 81.6 37.8 27.1Minimum fuse size (amps) or HACR circuit breaker ampacity

80 45 30 110 50 35


100 50 35 125 50 40


McQuay Cat 1702 15

Electrical Data

Wiring Diagrams

Figure 6: RCS 06E and RCS 07E Wiring Diagram

C OM PON E N T CODEC C C OM PR E S S OR CON TAC TORC C H C R A N K CAS E H EAT ERC OM P C OM PR E S S ORC PM C OM PR E S S OR PR OT EC TION

MODU L EC T C ON T ROL T RA NS FOR M ERF C FAN MOTOR CON TAC TORF CC FAN CYC L E CON T ROLG N D G R OUND

H R HEAT RELAY AS NEEDEDL PC LOW PR E S S U RE CON T ROLMS M ETA L ST RIPOF M OUTDOOR FAN MOTORPR PILOT RE LAYR C R U N CA PAC ITORT B T ER MINAL BLO C KT DC TIME DE LAY CON T ROLTHM MOTOR SA F ET Y TH ER MOS TAT

W IR E N U T

NOT ES :1. R E PLAC EMENT WIR E & F US E S

MUS T BE SAM E TY PE & SIZ EAS OR IG INA L.

2. U NIT MUS T BE PE RMANENTLYG R OUNDED AND CON FOR MTO N. E. C. AND LO CA L CODE S .

3. MAXIMUM IN RUS H VA NOT TOE XC E ED 92 VA.

4. MINIMUM WIR E SIZ E BAS E DON 75 DE G R E E S C INS U LATIONC OPPE R W IR E .

W IR ING IN FOR M AT ION1. L IN E VOLTAG E

FAC TOR Y STANDA R DFAC TOR Y OP TIONF IELD INS TALLED

2 . LOW VOLTAG EFAC TOR Y STANDA R DFAC TOR Y OP TIONF IELD INS TALLED

3. R E PLAC EMENT WIR EMUS T BE TH E SAM E SIZE AND TY PE OFINS U LATION AS OR IG INAL (105°C MIN. )

WA R NINGCA BIN ET MUS T BE PE RMANENTLY G R OUNDED AND CON FOR M TO N. E. C. ,( C. E. C. - CA NADA) AND LO CA L CODE S .

90-42456-12-02

W IR ING SC H E M AT ICC ON DE NS ING U NIT

6.5 and 7.5 TON208-230, 380,

460 & 575V, 60 Hz200-220, 380-415 V, 50 Hz

W IR E COL OR CODEB K — BLACK O — ORANGEB R — BROWN P R — PURP L EB L — BLUE R — R E DG — GR E E N W — WHITEG Y — GRAY Y — YELLOW

H PC HIG H PR E S S U RE CON T ROL

16 McQuay Cat 1702

Electrical Data

Figure 7: RCS 10E – RCS 20E Wiring Diagram

C OM PON E N T CODE

C C C OM PR E S S OR CON TAC TORC C H C R A N K CAS E H EAT ERC OM P C OM PR E S S ORC T C ON T ROL T RA NS FOR M ERDIS C DIS C ON N EC T SW ITC HF C FAN MOTOR CON TAC TORF CC FAN CYC L E CON T ROLG N D G R OUNDHR H E A T E R R E L A Y A S N E E D E D H PC HIG H PR E S S U RE CON T ROLL PC LOW PR E S S U RE CON T ROLMS M ETA L ST RIPOF M OUTDOOR FAN MOTORR C R U N CA PAC ITORR R E LAYT B T ER MINAL BLO C KTH TH ER MOS TAT H EATINGT DC TIME DE LAY CON T ROLTHM MOTOR SA F ET Y TH ER MOS TATTOR TH ERMAL OV ER LOA D RE LAY

W IR E N U T

NOT ES :1. R E PLAC EMENT WIR E & F US E S

MUS T BE SAM E TY PE & SIZ EAS OR IG INA L.

2. U NIT MUS T BE PE RMANENTLYG R OUNDED AND CON FOR MTO N. E. C. AND LO CA L CODE S .

3. MAXIMUM IN RUS H VA NOT TOE XC E ED 92 VA.

4. MINIMUM WIR E SIZ E BAS E DON 75 DE G R E E S C INS U LATIONC OPPE R W IR E .

W IR ING IN FOR M AT ION1. L IN E VOLTAG E

FAC TOR Y STANDA R DFAC TOR Y OP TIONF IELD INS TALLED

2. LOW VOLTAG EFAC TOR Y STANDA R DFAC TOR Y OP TIONF IELD INS TALLED

3. R E PLAC EMENT WIR EMUS T BE TH E SAM E SIZE AND TY PE OFINS U LATION AS OR IG INAL (105°C MIN. )

WA R NINGCA BIN ET MUS T BE PE RMANENTLY G R OUNDED AND CON FOR M TO I. E. C. ,N. E. C. ( C. E. C. - CA NADA) AND LO CAL .C ODE S AS A PP L IC A BL E.

90-42663-08-03

W IR ING SC H E M AT ICC ON DE NS ING U NIT

10, 121/2, 15 & 20 TON208-230,

460, 575, 3 PH, 50 & 60 Hz380, 3 PH, 60 Hz

W IR E COL OR CODEB K — BLACK O — ORANGEB R — BROWN P R — PURP L EB L — BLUE R — R E DG — GR E E N W — WHITEG Y — GRAY Y — YELLOW

A H SUPPLY FAN

McQuay Cat 1702 17

Engineering Guide Specification
Part 1: General

1.01 Summary:

A Section includes design, performance criteria, refrigerants, and installation requirements for air cooled split condensing units

1.02 References

A ARI-365 Commercial and Industrial Unitary Air Cooled Condensing Units

B ANSI / ASHRAE 15 Safety Standard for Refrigerated Systems

1.03 Submittals

A Submit Shop drawings and product data in accordance with the specifications.

B Submittals shall include the following:

1 Dimensioned drawings with required clearances and location of all field connections.

2 Summary of all auxiliary utility requirements, such as electricity, water, compressed air, etc. Summary shall indicate quality and quantity of each required utility.

1.04 Qualifications

A Qualifications: Equipment manufacturer must specialize in the manufacture of the type of products specified and have five years experience with similar equipment and refrigerant offered.

B Regulatory Requirements: Comply with the codes and standards specified.

C Manufacturer's plant must be ISO Registered.

1.05 Delivery and Handling

A Condensing units shall be delivered to the job site assembled and charged with a holding charge of dry nitrogen.

B Comply with the manufacturer's instructions for rigging and handling equipment.

1.06 Warranty

A The refrigeration equipment manufacturer's initial warranty shall be within 12 months from start-up or 18 months, whichever occurs first. The warranty shall provide for repair or replacement due to material and workmanship that proves defective within the above period, excluding refrigerant.

1.07 Maintenance

A Include instructions for installation, maintenance and service.

B Maintenance of the units shall be the responsibility of the owner and performed in accordance with the manufacturer's instructions.

Part 2: Products

2.01 Acceptable Manufacturers

A Basis of design: McQuay International

B (Approved Equal)

2.02 Unit Description

A Provide and install as shown on the plans factory-assembled, air-cooled scroll compressor, R22 condensing units in the size and quantity specified. Each unit shall consist of hermetic scroll compressor air-cooled condenser section.

B The complete unit shall be UL listed.

2.03 Design Requirements

A General: Provide a complete condensing unit as specified herein and as shown on the drawings. The unit shall be in accordance with the standards referenced in section 1.02 and any local codes in effect.

B Performance: Refer to the schedule of performance on the drawings.

2.04 Condensing Section (Scroll)

A Air Cooled Condenser

1 The condensing section shall be open on the sides and bottom to provide access and to allow airflow through the coils. Condenser coils shall be constructed with 3/8" copper tubing mechanically bonded to aluminum fins for maximum heat transfer. Each condenser coil shall be factory leak tested with high-pressure air under water.

2 Condenser fans shall be direct drive, propeller type designed for low tip speed, vertical air discharge, and include service guards. Fan blades shall be constructed of steel and riveted to a steel center hub. Condenser fan motor shall be direct drive, single phase permanently lubricated “PSC” motors with inherent thermal overload.

3 Unit shall have standard pressure controls that cycle the condenser fan motors to maintain condensing pressures for operation down to 0°F ambient.

B Scroll Compressors

1 Unit shall have heavy-duty Copeland scroll compressors.

2 Compressors shall be isolated with resilient rubber isolators to decrease noise transmission.

18 McQuay Cat 1702


3 Compressor circuit shall be complete with low pressure control, liquid line shut off valve, and manual reset high pressure safety switch.

C Refrigerant Circuit: Capped connections shall be external to the unit providing for field connection of refrigerant piping.

D Unit shall have a liquid line service valve.

2.05 Controls

A Unit shall be equipped with a 24 V terminal strip for field supplied and installed controls.

2.06 Electrical

A All wiring shall comply with UL requirements. The unit shall be provided with a factory wired weatherproof control panel. Unit shall have a single point power terminal block for main power connection. A terminal board shall be provided for low voltage control wiring.

Part 3: Execution

3.01 Installation

A Install in strict accordance with manufacturer's requirements, shop drawings, and contract documents.

B Adjust and level unit in alignment on supports.

C Coordinate electrical installation with electrical contractor.

D Coordinate controls with control contractor.

3.02 Start-Up

A Install proper charge of refrigerant and oil.

B Provide testing and starting of machine, and instruct the owner in its proper operation and maintenance.

McQuay Cat 1702 19

© 2009 McQuay International • www.mcquay.com • 800-432-1342 07/09

McQuay Training and Development

Now that you have made an investment in modern, efficient McQuay equipment, its care should be a high priority. For training information on all McQuay HVAC products, please visit us at www.mcquay.com and click on training, or call 540-248-9646 and ask for the Training Department.

Warranty

All McQuay equipment is sold pursuant to its standard terms and conditions of sale, including Limited Product Warranty. Consult your local McQuay Representative for warranty details. Refer to Form 933-43285Y. To find your local McQuay Representative, go to www.mcquay.com.

This document contains the most current product information as of this printing. For the most up-to-date product information, please go to www.mcquay.com.

air cooled split system condensing unit for rooftop ......performance data performance...

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