McQuay RCS 06F Installation Manual
Installation and Maintenance Manual IM 962
Air-Cooled Split System Condensing
Units for Rooftop Systems and Air
Handlers
Models RCS 06F – 20F
6.5 to 20 Tons
R-410A Refrigerant
Group: Applied Air Systems
Part Number: IM 962
Date: February 2009
6.5 – 7.5 Tons
10 – 12 Tons
15 – 20 Tons
© 2008 McQuay International
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . 3
Checking Product Received . . . . . . . . . . . . . . 3
Standard Unit Features . . . . . . . . . . . . . . . . . . . . 4
Unit Capacity and Physical Data. . . . . . . . . . . 5
Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Crankcase Heaters . . . . . . . . . . . . . . . . . . . . 10
Order Parts . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Standard Items . . . . . . . . . . . . . . . . . . . . . . . 10
Corrosive Environment . . . . . . . . . . . . . . . . . 10
Installation General . . . . . . . . . . . . . . . . . . . . 10
Rooftop Installation . . . . . . . . . . . . . . . . . . . . 10
Slab Installation. . . . . . . . . . . . . . . . . . . . . . . 10
Installation of Piping . . . . . . . . . . . . . . . . . . . . . . 12
Typical Piping Recommendations . . . . . . . . . . . 12
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electrical Power . . . . . . . . . . . . . . . . . . . . . . 14
Power Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 14
Wire Routing . . . . . . . . . . . . . . . . . . . . . . . . . 14
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Leak Testing. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Tools Required for Installing & Servicing R410A
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Specification Of R410A:. . . . . . . . . . . . . . . . . . . 16
Quick Reference Guide For R410A . . . . . . . . . . 16
Replacement Units . . . . . . . . . . . . . . . . . . . . . . 16
Evaporator Coil . . . . . . . . . . . . . . . . . . . . . . . . . 16
Evacuation and Charging . . . . . . . . . . . . . . . . . 17
Final Leak Testing . . . . . . . . . . . . . . . . . . . . . . . 17
Accessories Installation . . . . . . . . . . . . . . . . . . . 18
Louvers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Maintenance and Operation . . . . . . . . . . . . . . . 19
Crankcase Heaters. . . . . . . . . . . . . . . . . . . . 19
Contactor . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
High Pressure Switch (HPC) . . . . . . . . . . . . 19
Low Pressure Switch (LPC) . . . . . . . . . . . . . 19
Relay (R) . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Replacement Parts . . . . . . . . . . . . . . . . . . . . 19
Charge Information. . . . . . . . . . . . . . . . . . . . 19
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . 19
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . 19
Charging Charts . . . . . . . . . . . . . . . . . . . . . . 20
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . 26
Replacement Parts . . . . . . . . . . . . . . . . . . . . 28
Scroll Compressor . . . . . . . . . . . . . . . . . . . . 28
All Compressors . . . . . . . . . . . . . . . . . . . . . . 28
In-Warranty Return Material Procedure . . . . 28
Introduction
Rooftop Condensing System
Voltage
C = 208/230 - 3 - 60
D = 460 - 3 - 60
Y = 575 - 3 - 60
R C S – 06 – F – 078 – C
Nominal capacity (tons)
06 = 6.5
07 = 7.5
10 = 10 (single compressor)
11 = 10 (tandem compressors)
12 = 12
15 = 15
20 = 20
Refrigerant
F = R-410A
Compressor
078 = 6.5 ton, single
090 = 7.5 ton, single
120 = 10 ton, single
125 = 10 ton, tandem
150 = 12.5 ton, tandem
180 = 15 ton, tandem
240 = 20 ton, tandem
Introduction
DANGER
The use of unauthorized components, accessories or devices
may adversely affect the operation of the condensing unit and
may also endanger life and property.
The manufacturer disclaims any responsibility for such loss or
injury and the manufacturer’s warranty does not cover any
damage or defect to the air conditioner caused by the
attachment or use of any components, accessories or devices
(other than those authorized by the manufacturer) into, onto or
in conjunction with the condensing unit.
This manual contains the installation and operating
instructions for your split condensing unit. There are a few
precautions that should be taken to derive maximum
satisfaction from it. Improper installation can result in
unsatisfactory operation or dangerous conditions.
Read this manual and any instructions packaged with separate
equipment required to make up the system prior to installation.
Give this manual to the owner and explain its provisions. The
owner should retain this manual for future reference.
Nomenclature
Hazard Identification Information
DANGER
Dangers indicate a hazardous situation which will result in
death or serious injury if not avoided.
WARNING
Warnings indicate potentially hazardous situations, which can
result in property damage, severe personal injury, or death if
not avoided.
CAUTION
Cautions indicate potentially hazardous situations, which can
result in personal injury or equipment damage if not avoided.
Note: For larger size units (greater than 20 ton), refer to Catalog 222.
Checking Product Received
Upon receiving the unit, inspect it for any damage from
shipment. Claims for damage, either shipping or concealed,
should be filed immediately with the shipping company. Check
the unit model number, electrical characteristics, and
accessories to determine if they are correct.
McQuay IM 962 3
Introduction
Standard Unit Features
CABINET — Galvanized steel with a durable powder paint
finish. Stamped louvered panels offer 100% protection for the
condenser coil.
COMPRESSOR — Hermetically sealed scroll compressors.
Compressors are mounted on rubber-in-shear pads to reduce
vibration and noise.
CONDENSER COIL — Constructed with copper tubes and
aluminum fins mechanically bonded to the tubes for maximum
heat transfer capabilities. All coil assemblies are leak tested at
450 psig internal pressure.
REFRIGERANT CONNECTIONS — Field piping
connections are made through a fixed panel. This allows
complete access or removal of access panels after piping
connections have been made.
CRANKCASE HEATER — Standard, all models.
LOW AMBIENT CONTROL — A pressure sensitive fan
cycling control to allow unit operation to 0°F is standard.
SERVICE VALVES — Standard on liquid lines and vapor
lines.
SERVICE ACCESS — The control box, as well as the
compressor and other refrigerant controls, is accessible
through access panels. It may be opened without affecting the
normal operation of the unit.
Condenser fan motors are accessible by removing wire grilles.
FILTER DRIER — Field supplied.
SIGHT GLASS — Optional, field supplied.
TRANSFORMER — Step down type, line to 24 volts.
CONTACTOR — The contactor is an electrical switch which
operates the compressor and condenser fans.
HIGH PRESSURE CONTROL — Opens the contactor
circuit on high refrigerant pressure; manual reset.
LOW PRESSURE CONTROL — Stops compressor
operation in the event of loss of refrigerant.
CONDENSER FAN MOTOR (Direct Drive) — Ball bearing
1075 RPM motors are mounted to minimize vibration and
noise problems.These are permanent split capacitor types and
require the same capacitance for both run and start.
TESTING — All units are run tested at the factory prior to
shipment. Units are shipped with a holding pressure of
nitrogen.
Figure 1: RCS 06F & 07F Ton Features
4 McQuay IM 962
Figure 2: RCS 10F – 20F Ton Features
Introduction
Unit Capacity and Physical Data
Table 1: RCS 06F – 20F
RCS
Model
Capacity and Weight
Capacity (tons) [kW] 6.5 [22.9] 7.5 [26.4] 10 [35.2] 10 [35.2] 12 [42.2] 15 [52.8] 20 [70.3]
Operating weight 264 [119.8] 283 [128.4] 501 [227.3] 586 [265.8] 650 [294.8] 746 [338.4] 952 [431.8]
Shipping weight 287 [130.2] 306 [138.8] 541 [245.4] 626 [284.0] 690 [313.0] 786 [356.5] 992 [450.0]
Compressor
Quantity 1 1 1 2 2 2 2
Type Scroll Scroll Scroll Scroll Scroll Scroll Scroll
RPM 3500 3500 3500 3500 3500 3500 3500
Refrigerant charge R410A oz. [g] 178 [5046] 242 [6861] 339 [9661] 300 [8505] 378 [10,716] 506 [14,345] 655 [18,569]
Condenser Fans
Quantity 1 1 2 2 2 3 3
CFM [L/s] 4700 [2218] 4700 [2218] 8100 [3822] 8100 [3822] 8100 [3882]
Diameter (in.) [mm] 24 [610] 24 [610] 24 [610] 24 [610] 24 [610] 24 [610] 24 [610]
Drive Direct Direct Direct Direct Direct Direct Direct
Motor horsepower each [W] 1/3 [249] 1/3 [249] 1/3 [249] 1/3 [249] 1/3 [249] 1/3 [249] 1/3 [249]
Type PSC PSC PSC PSC PSC PSC PSC
RPM 1075 1075 1075 1075 1075 1075 1075
Condenser Coil
Quantity 1 1 2 2 2 2 2
Rows 1 1/2 2 2 2 2 2 3
Fins per inch 20 22 18 22 22 22 22
Sq. ft. [m
Fins/tubes Aluminum/Copper
Cabinet
Finish Powder Coat
Sheet metal Galvanized
Gauge (nominal) top 20 20 20 20 20 20 20
Sides 20 20 20 20 20 20 20
Base rails 141414 14 14 14 14
Refrigerant Connection
Vapor sweat (in.) [mm] 1-1/8 [29] 1-1/8 [29] 1 3/8 [35] 1 3/8 [35] 1 3/8 [35] 1 3/8 [35] 1 5/8 [41.3]
Liquid sweat (in.) [mm] 1/2 [13] 1/2 [13] 5/8 [16] 5/8 [16] 5/8 [16] 5/8 [16] 7/8 [22]
2
]
06F
Single
23.0 [2.14] 23.0 [2.14] 27.0 [2.51] 27.0 [2.51] 33.9 [3.05] 40.38 [3.75] 40.38 [3.75]
07F
Single
10F
Single
11F
Tan dem
12F
Tan dem
15F
Tandem
12,000
[5663]
20F
Tan dem
12,000
[5663]
McQuay IM 962 5
Introduction
31.06
43.00
32.81
CONTROL
PANEL ACCESS
SUCTION
LINE 1
LIQUID
LINE
1/2"
1/8"
HIGH VOLTAGE
3/4"
DIA. HOLE1
LOW VOLTAGE
7/8"
DIA. HOLE
21.69
24.19
26.63
28.44
C
A
D
B
A
B
D
C
CONTROL
PANEL ACCESS
39.94
62.14
44.75
38.375
Dimensional Data
Figure 3: RCS 06F and 07F Ton Units
Figure 4: RCS 10F Ton Units
6 McQuay IM 962
Figure 5: RCS 12F Ton Units
B
A
C
D
CONTROL
PANEL ACCESS
39.94
75.54
72.375
44.75
38.375
A
D
C
B
CONTROL
PANEL ACCESS
85.515
39.94
83.875
38.375
44.75
Introduction
Figure 6: RCS 15F to 20F Ton Units
McQuay IM 962 7
Introduction
Electrical Data
Table 2: RCS 06F and 07F Electrical Data
Model
Compressor Motor
Electrical characteristics
Operating Current
Rated load amps (each)
Locked rotor amps (each)
1
1
Condenser Fan Motors
Volt and phase
Full load amps (each)
System characteristics
Unit full load amps
2
Minimum circuit ampacity
Maximum fuse size (amps) or HACR circuit
breaker ampacity
3
Disconnect size
Note: 1 Each Compressor
2
Conditions at 45° suction and 95° ambient
3
Local codes take precedent over recommended fuse size
Table 3: RCS 10F (Single) and 11F (Tandem) Electrical Data
Model
Compressor Motor
Electrical characteristics
Operating Current
Rated load amps (each)
Locked rotor amps (each)
Condenser Fan Motors
Volt and phase
Full load amps (each)
System characteristics
Unit full load amps
Minimum circuit ampacity
Maximum fuse size (amps) or HACR circuit
breaker ampacity
Disconnect size
Note: 1 Each Compressor
2
Conditions at 45° suction and 95° ambient
3
Local codes take precedent over recommended fuse size
1
1
2
3
208/230-3-60 460-3-60 575-3-60 208/230-3-60 460-3-60 575-3-60
22.4 10.6 7.0 25.0 12.2 9.0
149 75 54 164 100 78
208/230-1 460-1 575-1 208/230-1 460-1 575-1
2.2 1.3 1.0 2.2 1.3 1.0
25.0 12.0 8.0 28.0 14.0 10.0
30.2 14.6 9.8 33.5 16.6 12.3
50 25 15 50 25 20
60 30 30 60 30 30
10F (Single) 11F (Tandem)
208/230-3-60 460-3-60 575-3-60 208/230-3-60 460-3-60 575-3-60
30.1 16.7 12.2 17.6 9.6 6.1
225 114 80 135 64 40
208/230-1 460-1 575-1 208/230-1 460-1 575-1
2.2 1.3 1.0 2.2 1.3 1.0
39.0 19.5 15.0 40.0 22.0 19.0
42.0 23.5 17.3 44.0 23.6 16.3
60 40 25 60 30 25
60 40 25 60 30 30
RCS
06F 07F
RCS
8 McQuay IM 962
Introduction
Table 4: RCS 12F and 15F Electrical Data
Model
12F 15F
Compressor Motor
Electrical characteristics 208/230-3-60 460-3-60 575-3-60 208/230-3-60 460-3-60 575-3-60
Operating Current
Rated load amps (each)
Locked rotor amps (each)
1
1
22.4 10.6 7.7 25.0 12.2 9.0
149 75 54 164 100 78
Condenser Fan Motors
Volt and phase 208/230-1 460-1 575-1 208/230-1 460-1 575-1
Full load amps (each) 2.2 1.3 1.0 2.2 1.3 1.0
System characteristics
Unit full load amps
2
42.0 20.7 16.7 64.3 33.7 24.5
Minimum circuit ampacity 47.0 24.0 19.0 72.0 38.0 28.0
Maximum fuse size (amps) or HACR circuit
breaker ampacity
3
Disconnect size
Note: 1 Each Compressor
2
Conditions at 45° suction and 95° ambient
3
Local codes take precedent over recommended fuse size
60 30 25 100 50 35
60 30 30 100 60 60
Table 5: RCS 20F Electrical Data
Model
Compressor Motor
Electrical characteristics 208/230-3-60 460-3-60 575-3-60
Operating Current
Rated load amps (each)
Locked rotor amps (each)
Condenser Fan Motors
Volt and phase 208/230-1 460-1 575-1
Full load amps (each) 2.2 1.3 1.0
System characteristics
Unit full load amps
Minimum circuit ampacity 91.0 42.0 31.0
Maximum fuse size (amps) or HACR circuit
breaker ampacity
Disconnect size 200 60 60
Note: 1 Each Compressor
2
Conditions at 45° suction and 95° ambient
3
Local codes take precedent over recommended fuse size
1
1
2
3
33.3 17.9 12.8
239 125 80
81.6 37.8 27.1
125 50 40
RCS
20F
RCS
Figure 7: Control Box Example – RCS 10F Through 20F
McQuay IM 962 9
Introduction
Installation
Crankcase Heaters
These units are equipped with a crankcase heater that is factory
wired to operate whenever the main power supply to the unit is
“on” and compressors are “off.” Before starting the equipment
after prolonged shutdown or at the time of initial spring startup, be sure that the circuits to the condensing units are closed
for at least 24 hours.
Order Parts
When reporting shortages or damaged parts, or when ordering
repair parts, give the complete unit model and serial numbers
which are stamped on the unit rating plate.
Standard Items
The condensing unit consists of a completely assembled
package which includes a compressor pack, condenser coils,
fans, fan motors, outdoor control box, factory wiring, factory
tubing and fittings.
Corrosive Environment
• A good liquid cleaner may be used several times a year to
remove matter that will not wash off with water.
Several different types of protective coatings are offered in
some areas. These coatings may provide some benefit, but the
effectiveness of such coating materials cannot be verified by
the equipment manufacturer.
Installation General
The condensing unit should be installed outdoors. It should be
located as near as possible to the evaporator section to keep
connecting refrigerant tubing lengths to a minimum. The unit
must be installed to allow a free air flow to the condenser coils.
Figure 8: Clearances RCS 06F – 20F Service Clearances
The metal parts of this unit may be subject to rust or
deterioration if exposed to a corrosive environment. This
oxidation could shorten the equipment's useful life. Corrosive
elements include salt spray, fog or mist in seacoast areas,
sulphur or chlorine from lawn watering systems, and various
chemical contaminants from industries such as paper mills and
petroleum refineries.
If the unit is to be installed in an area where contaminants are
likely to be a problem, special attention should be given to the
equipment location and exposure.
• Avoid having lawn sprinkler heads spray directly on the unit
cabinet.
• In coastal areas, locate the unit on the side of the building
away from the waterfront.
• Shielding provided by a fence or shrubs may give some
protection, based on clearances recommended in this book.
Regular maintenance will reduce the buildup of contaminants
and help to protect the unit's finish.
DANGER
Disconnect all power to unit before starting maintenance.
Failure to do so can cause electrical shock resulting in severe
personal injury or death.
• Frequent washing of the cabinet, fan blade and coil with
fresh water will remove most of the salt or other
contaminants that build up on the unit.
• Regular cleaning and waxing of the cabinet with a good
automobile polish will provide some protection.
If several units are installed adjacent to each other, take care to
avoid recirculation of air from one condenser to another. In all
installations, adequate space must be provided for installation
and servicing.
The unit must not be connected to any duct work. Do not
locate unit under a roof drip; if necessary, install gutters, etc.,
to prevent water runoff onto the unit. To prevent air
recirculation, it is recommended that the unit not be installed
under an overhang. However, if this is necessary, allow a
minimum of 60 inches above the unit for air discharge.
Rooftop Installation
If rooftop installation is required, make certain that the
building construction is adequate for the weight of the unit.
(Refer to physical data chart.) Before placing the unit on the
roof, make certain that the nylon rigging slings are of
sufficient length to maintain equilibrium of the unit when
lifting. Under no circumstances should the unit be lifted by
only one corner for rooftop installation.
Slab Installation
Condensing units should be set on a solid level foundation.
When installed at ground level, the unit should be placed on a
6 inch cement slab. If the pad is formed at the installation site,
do not pour the pad tight against the structure, otherwise
vibration will be transmitted from the unit through the pad.
10 McQuay IM 962
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