McQuay RCS 06E Installation Manual
Installat
ion and Maintenance Manual
Air Cooled Split-System Condensing Units
for Rooftop Systems and Air Handlers
Models RCS 06E to 07E
6.5 & 7.5 Tons
IM 909
roup: Applied Systems
G
Part Number: 92-102421-09-00
Date: February 2008
© 2008 McQuay International
Table of Contents
Table of Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
omenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
N
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Checking Product Received . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Standard Unit Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Sequence of Operation –61⁄2 and 71⁄2 Ton . . . . . . . . . . . . . . . . . 4
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Liquid Line Solenoid Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Sight Glass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Important Message to Owner . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Inspection and Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Order Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Standard Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Location Considerations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Outside Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Rooftop Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation of Piping . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical Piping Recommendations . . . . . . . . . . . . . . . 9
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Hook-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Internal Wiriing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
208 Volt Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Leak Testiing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Evacuation and Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
System Operating Information . . . . . . . . . . . . . . . . . 13
Advise The Customer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Contactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
High Pressure Switch (HPC) . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Low Pressure Switch (LPC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Replacement Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Charging. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Trouble Shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Charging Charts . . . . . . . . . . . . . . . . . . . . . . . . . . 15-16
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Service and Warranty Procedure . . . . . . . . . . . . . . . 18
RCS Condensing Unit Equipment Warranty
Registration Form. . . . . . . . . . . . . . . . . . . . . . . 19-20
Quality Assurance Survey Report . . . . . . . . . . . . . . 21
Nomenclature
R C S — 06 –E
Design vintageRooftop Condensing Unit
Nominal capacity (tons)
06, 07
IM 9092
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.
DANGER
!
▲▲
Units are not design certified to be installed inside the
structure. Doing so can cause inadequate unit performance
as well as property damage and carbon monoxide poisoning resulting in personal injury or death.
Introduction
This manual contains the installation and operating instructions for your commercial 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.
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.
IMPORTANT: Check the unit model number, heating size, electrical characteristics, and accessories to determine if they are
correct.
Standard Unit Features
CABINET — Galvanized steel with a durable powder coat
paint finish. The cabinet front and sides are formed into a
one-piece unitized design with stamped louvers to provide
protection for the condenser coils.
SERVICE ACCESS — The control box, as well as compressor and other refrigerant controls, is accessible through access
panels. It may be operated without affecting the normal operation of unit.
Condenser fan motors are mounted on removable top panels.
his brings the motors out to you and expose entire condenser
T
coil for cleaning.
COMPRESSOR — Hermetically sealed with internal high
temperature protection and durable insulation on motor wind-
1
⁄2 ton 575 volt models employ external solid state pro-
ings. 7
ective module. The compressor is mounted on rubber grom-
t
mets to reduce vibration and noise.
CONDENSER COILS — Constructed with copper tubes
and aluminum fins, mechanically bonded to tubes, for maximum heat transfer capabilities. All coil assemblies are leak
tested up to 450 PSIG internal pressure.
REFRIGERANT CONNECTIONS — All field sweat joints
are made external of the unit and are located close to the
ground for a neat looking installation.
LOW AMBIENT CONTROL — A pressure-sensitive, fan
cycling control allows operation of units down to to 0°F.
HIGH PRESSURE CONTROL — Manual reset control
deactivates system if abnormally high pressure occurs.
LOW PRESSURE CONTROL — Automatic reset control
deactivates system if abnormally low pressure or refrigerant
loss occurs.
SERVICE VALVE — Standard on liquid line.
FILTER DRIER — Field supplied.
SIGHT GLASS — Field supplied.
CONDENSER FAN MOTORS — Direct-drive, PSC single-
phase motors.
TRANSFORMER — Step down type, from Line to 24 volts.
CONTACTOR — The contactor is an electrical switch
which operates the compressor and condenser fans. Its 24 volt
coil is activated through the High Pressure Control and Low
Pressure Control on a call for cooling.
CAPACITORS — Help provide starting torque necessary to
boost the condenser fan motors to operating speed by directing their stored energy to the starter winding in step with the
running winding.
EQUIPMENT GROUND — Lug for field connection of
ground wire.
TESTING — All units are run tested at the factory prior to
shipment.
IM 909
3
Sequence of Operation —
1 When the room temperature is higher than the thermostat
etting, the thermostat contacts close and energize the
s
compressor contactor (CC) through the high pressure,
low pressure and compressor module. If the unit has
“short cycled” and the optional time delay (TDC) has
been supplied, the contactor coil (CC) will remain de-
nergized for up to five (5) minutes.
e
2 The system will continue cooling operation, as long as
the contacts of all safety devices are closed and until the
thermostat is satisfied.
3 When the thermostat is satisfied, compressor or contactor
(CC) is de-energized.
Figure 1: Compressor Contactor
Figure 2: Time Delay Control
Sight Glass — Allows viewing of the refrigerant. Bubbles
may indicate a shortage of refrigerant or a restriction in the
liquid line. The color indicator shows relative moisture saturation of the refrigerant. Its inclusion in the refrigerant piping is
recommended. A minimum of 12 hours after installation is
required before attempting to determine if a moisture condition within the system exists.
Control Transformer
Compressor Contactor
Accessories
Time Delay Control – Prevents restarting of unit for five minutes if shut down for any reason. (See wiring diagram and
schematic in this manual for proper location and installation;
item TDC.)
Liquid Line Solenoid Valve (24V) — Recommended for all
split system applications, to prevent refrigerant migration during off cycles. See wiring connection Page 11. Solenoid to be
located in liquid line close to air handler.
Figure 3: Liquid Line Solenoid Valve
IM 9094
Unit Dimensions
Figure 4: Unit Dimensions and Weights
3253⁄64"
SUCTION
1
LINE 1
LIQUID
LINE 1⁄2"
C
IMPORTANT: THIS UNIT MUST BE
MOUNTED LEVEL IN BOTH DIRECTIONS TO ALLOW WATER TO
43
2
4
⁄64"
D
⁄8"
21
11
24
⁄16"
3
⁄16"
11
26
287⁄16"
⁄16"
HIGH VOLTAGE - 1
B
LOW VOLTAGE -
7
⁄8" HOLE
31
DRAIN FROM THE CONDENSER
1
SECTION AND CONDENSATE PAN.
⁄16"
A
3
⁄4" HOLE
IM 909
Corner Weights (Pounds)
Unit
Model RCS
06E
07E
Total Weight
Lbs. [kg]
266
330 55 [24.95]
Corner Weights, Lbs. [kg]
ABCD
45 [20.41]
66 [29.94]
87 [39.46]
63 [28.58]
73 [33.11]
91 [41.28]
116 [52.62]
5
Physical and Electrical Data
Table 1: Physical Data
Model No. RCS- 06 07
Capacity (tons) [kW] 6.5 [22.9] 7.5 [26.4]
Operating Weight (lbs) [kg] 266 [120.7] 330 [149.7]
Shipping Weight (lbs) [kg] 289 [131.1] 353 [160.1]
Compressor:
Quantity 11
Type Scroll
RPM 3500
Refrigerant Charge R-22 Oz. [g] 262 [7428] 262 [7428]
Condenser Fans:
Quantity 11
CFM [l/s] 3500 [1652] 3800 [1793]
Diameter (in) [mm] 24 [610] 24 [610]
Drive Direct
Motor Horsepower [Watts] each 1/3 [249] 1/3 [249]
Type PSC PSC
RPM 1075 1075
Condenser Coil:
Quantity 11
Rows 1
Fins per inch 20 22
Square Feet [m
2
] 22.2 [3] 22.2 [3]
Fins/Tubes Aluminum / Copper
Cabinet:
Finish Power Coat
Sheet Metal Galvanized
Gauge (nominal) Top 20 20
Sides 20 20
Base Rails 14 14
Refrigerant Connection:
Vapor - sweat (in) [mm] 1
Liquid - sweat (in) [mm]
Package Dimensions:
Height (in) [mm] 32.8 [833] 32.8 [833]
Width (in) [mm] 31.1 [789] 31.1 [789]
Length (in) [mm] 43.0 [1092] 43.0 [1092]
1
⁄2 2
1
⁄8 [29] 11⁄8 [29]
1
⁄2 [13]
1
⁄2 [13]
Table 2: Electrical Data
Electrical
Model
Number
RCS
06ECAZ 3-60-208/230 18.6/18.6 156 1.5 25/25 30/30 40/40 22.42 [2.08] 2 3500 [1652] 296 [8392] 266 [120.7] 289 [131.1]
06EDAZ 3-60-460 9 75 1 13 15 20 22.42 [2.08] 2 3500 [1652] 296 [8392] 266 [120.7] 289 [131.1]
06EYAZ 3-60-575 7.4 54 0.8 11 15 15 22.42 [2.08] 2 3500 [1652] 296 [8392] 266 [120.7] 289 [131.1]
07ECAZ 3-60-208/230 25.6/25.6 196 2.2 35/35 45/45 50/50 22.42 [2.08] 2 3800 [1793] 296 [8392] 330 [149.7] 353 [160.1]
07EDAZ 3-60-460 12.8 100 1.3 18 25 30 22.42 [2.08] 2 3800 [1793] 296 [8392] 330 [149.7] 353 [160.1]
07EYAZ 3-60-575 8.7 90 1 12 15 20 22.42 [2.08] 2 3800 [1793] 296 [8392] 330 [149.7] 353 [160.1]
Phase
Frequency (Hz)
Voltage (Volts)
Compressor
Rated Load
Amperes
(RLA)
Locked Rotor
Amperes
(LRA)
Fan Motor
Full Load
Amperes
(FLA)
Minimum
Circuit
Ampacity
Amperes
Fuse or HACR
Circuit Breaker
Minimum
Amperes
Maximum
Amperes
Face Area
Sq. Ft. [m2]
Outdoor Coil
No.
Rows
CFM
[L/s]
Refrig.
Per
Circuit
Oz. [g]
Net
Lbs. [kg]
Weight
Shipping
Lbs. [kg]
6 IM 909
Installation
Important Message to Owner
The manufacturer assumes no responsibility for equipment
installed in violation of any code or regulation. The operation
portion of this manual gives instructions as to the service and
care of the unit. It is recommended that the installer go over
he operational portion of this manual with the owner so that
t
there is a full understanding of the equipment and how it is
intended to function.
These instructions should be read and kept for future reference. It is suggested that this booklet be affixed to or adjacent
to the indoor equipment. It is addressed to your dealer and
serviceman, but we highly recommend that you read it—paying particular attention to the section titled “MAINTENANCE.”
Inspection and Handling
Inspect exterior of unit for evidence of rough handling in
shipment. If damage is found, enter claim at once. Unpack
carefully after moving unit to approximate location. Any damage should be reported immediately to the transportation company.
Material in this shipment was inspected at the factory and
released to the common carrier with no known damage.
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, a condenser coil, fan, fan
motors, outdoor control box, factory wiring, factory tubing
and fittings.
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.
If several units are installed adjacent to each other, care must
be taken to avoid recirculation of air from one condenser to
another. In all installations, adequate space must be provided
for installation and servicing.
Figure 5
Location Considerations
The metal parts of this unit may be subject to rust or deterioration in adverse environmental conditions. This oxidation
could shorten the equipment’s useful life. 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 are especially
corrosive.
If the unit is to be installed in an area where contaminants
are likely to be a problem, give special attention 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 by a fence or shrubs may give some protection.
• 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 an auto-
mobile polish will provide some protection.
• A 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.
The best protection is frequent cleaning, maintenance and
minimal exposure to contaminants.
DANGER
!
▲▲
These units are designed certified for outdoor installation
only. Installation inside any part of a structure can result in
inadequate unit performance as well as property damage.
Installation inside can also cause recirculation of flue products into the conditioned space resulting in personal injury
or death.
IM 909
7
Outside Installation
1 Select a location where external water drainage cannot
ollect around unit.
c
Provide a level slab sufficiently high enough above grade
2
to prevent surface water from entering the unit.
3 Locate the unit to provide proper access for inspection
and servicing.
4 Locate unit where operating sounds will not disturb
owner or neighbors.
5 Locate unit so roof runoff water does not pour directly on
the unit. Provide gutter or other shielding at roof level.
Do not locate unit in an area where excessive snow drifting may occur or accumulate.
6 Select an area which will keep the areas of the vent, air
intake, and A/C condenser fins free and clear of obstructions such as weeds, shrubs, vines, snow, etc. Inform the
user accordingly.
7 To prevent air recirculation, it is recommended that the
unit not be installed under an overhang, but if necessary
allow a minimum of 60 inches above the unit for air
discharge.
8 Condensing units should be set on a solid level founda-
tion. 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.
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.
1 Before locating the unit on the roof, make sure that the
roof structure is adequate to support the weight involved.
(See Electrical & Physical Table in this manual.) THIS
IS VERY IMPORTANT AND THE INSTALLER’S
RESPONSIBILITY.
2 The location of the unit on the roof should be such as to
provide proper access for inspection and servicing.
Figure 6: Suggested Lifting Arrangement
NYLON SLINGS
PREADER BARS
S
Installation of Piping
WARNING
!
▲▲
Do not use oxygen to purge lines or pressure system for
leak test. Oxygen reacts violently with oil, which can cause
an explosion resulting in severe personal injury or death.
Table 3: Refrigerant Piping Data
EQUIVALENT LENGTH (FT.) OF STRAIGHT TYPE “L” TUBING
FOR NON-FERROUS VALVES & FITTINGS (BRAZED)
TUBE SIZE
INCHES
O.D.
1
5
3
7
11⁄8
13⁄8
15⁄8
21⁄8
Once located, the condensing unit is ready to be interconnected with the evaporator using ONLY refrigeration grade dehydrated tubing. The following should be considered when connecting the tubing.
1 Pitch the suction line toward the compressor approxi-
mately 1⁄2 inch every 10 feet to facilitate oil return.
2 It is recommended that the sight glass, filter drier and liq-
uid line solenoid valve be installed in the liquid line just
prior to the evaporator.
3 Silver solder (such as silfos, Easy Flow, etc.) should be
used for all refrigerant joints.
SOLE-
NOID
VALVE
⁄2
⁄8
⁄4
⁄8
ANGLE
VALVE
70
72
75
78
87
102
115
141
24
25
25
28
29
33
34
39
SHORT
RADIUS
ELL
4.7
5.7
6.5
7.8
2.7
3.2
3.8
5.2
LONG
RADIUS
ELL
3.2
3.9
4.5
5.3
1.9
2.2
2.6
3.4
TEE
LINE
FLOW
1.7
2.3
2.9
3.7
5.2
6.9
8.7
12.0
TEE
BRANCH
FLOW
6.6
8.2
9.7
12.0
8.0
10.0
12.0
16.0
IM 9098
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