McQuay SWP Series Installation and Maintenance Manual

Brand: McQuay

Model: SWP Series

Category: Split-system air conditioners

Type: Installation and Maintenance Manual

SWP Vintage Sizes 018 through 105

MicroTech III

Unit Controller

Installation and Maintenance IM 937

Self-Contained Air Conditioning System

Group: Applied Systems

Part Number: IM 937

Date: October 2008

MEA

368-93-E

Contents

Introduction .............................................................. 3

General Description ............................................ 3

Inspection ........................................................... 3

Installation ................................................................ 4

Handling ............................................................. 4

Vibration Isolators ............................................... 4

Setting Factory-Supplied Plenum ....................... 4

Location/Service Access..................................... 4

Removing Shipping Restraints ........................... 5

Refrigerant Piping—Pressure Relief Valves ....... 5

Water Connections ............................................. 5

Duct Connections ............................................... 8

Physical Data ........................................................... 9

Dimensional Data ............................................. 10

Unit Weights ..................................................... 12

Electrical Data......................................................... 14

Field Wiring....................................................... 14

Control Center .................................................. 16

Electrical Legend .............................................. 18

Typical Wiring Schematics................................ 20

Control Panel Components ................................... 29

Control Panel Components............................... 29

High Pressure Switches.................................... 31

Low Pressure Switches .................................... 31

Compressor Motor Protector ............................ 31

Unit Options............................................................ 32

Proof of Airflow Switch...................................... 32

Frost Protection Switches ................................. 32

Clogged Filter Switch........................................ 32

Winterizing Water Coils .................................... 32

Duct High Limit ................................................. 32

Phase Fail/Under Voltage Protection................ 33

Duct Static Pressure Sensor ............................ 33

Adjustable Frequency Drive ............................. 34

Hot Gas Bypass ............................................... 34

Freezestat ........................................................ 34

Condenser Water Flow Switch......................... 35

Water Side Economizer ................................... 35

Condenser Water Head Pressure Control ....... 35

Disconnect Switch............................................ 35

Dual Power Supply........................................... 35

Electric Heat..................................................... 35

Hot Water Control ............................................ 35

Battery Pack..................................................... 35

MicroTech III Keypad Navigation.......................... 36

Using the Keypad/Display .................................... 36

Passwords........................................................ 36

Navigation Mode .............................................. 37

Edit Mode ......................................................... 37

System Check, Test, and Start ............................. 40

General ............................................................ 40

Pre Start-Up ..................................................... 40

Start-Up............................................................ 41

System Maintenance ............................................. 45

Planned Maintenance ...................................... 45

Bearing Lubrication .......................................... 45

Replacement Parts................................................. 48

Service and Warranty Procedure ......................... 49

Replacement Parts........................................... 49

Compressors.................................................... 49

All Compressors............................................... 49

Warranty Return Material Procedure ............... 50

Check, Test, and Start Procedure Form .............. 51

McQuay IM 937 3

Introduction

General Description

McQuay Self-Contained Air Conditioning units, models SWP

018 through 105 are factory assembled, refrigerant charged

and tested, water-cooled packaged air conditioning units

designed for ducted applications.

Each unit contains multiple hermetic compressors, water

cooled condensers, multi-circuit evaporator, thermal expansion

valves, interconnecting refrigerant piping, forward curved or

airfoil centrifugal fan, belt drive, fan motor, pleated filters and

all necessary operating and safety controls.

All rigging, installation, power and control wiring external to

the unit, and condenser water and condensate piping are the

responsibility of the installer.

The MicroTech III

self-contained unit controller is standard

equipment. For a detailed description of the MicroTech

components, input/output configurations, field wiring options

and requirements, and service procedures, refer to IM 919,

“MicroTech III Unit Controls.” For a description of operation

and information on using and programming the MicroTech III

unit controller, refer to OM 920 “MicroTech III Unit

Controls.”

Inspection

When the equipment is received, carefully check all items

against the bill of lading to ensure a complete shipment. Do

not sign the shipping receipt until all items are accounted for.

Carefully inspect all units for damage upon arrival. Report all

shipping damage to the carrier and file a claim. Before

unloading the unit, check the unit serial plate to be sure it

agrees with the power supply available.

Figure 1: Nomenclature

Vintage

D = Individual condenser circuit, 18–95 tons

E = Individual condenser circuit, 105 tons

F = Dual circuit

Nominal tons

Self-contained

Water cooled

Plenum discharge

SWP - 055 - F

4 McQuay IM 937

Installation

Handling

Units ship with a protective covering that should remain in

place while the unit is being moved to its final location.

Units are provided with lifting lugs for rigging with a crane. If

units are lifted by crane, use slings or cable to protect against

chaffing damage and use spreader bars across the top of the

cabinet to prevent any structural damage to the frame.

The unit base frame accepts dollies or Johnson bars for

transporting. Place dollies at both ends of the chassis or at one

end and use a Johnson bar at the other end for maneuvering.

Protect floor surfaces when equipment is moved across

finished flooring. Use plywood sheeting to protect surfaces

and distribute weight loading.

Vibration Isolators

All units are provided with 1" neoprene isolation pads, shipped

separately. Install pads beneath the unit, locating at each corner

and the center of each base channel. For units provided with

more than six isolator pads, evenly space the additional pads

under the front and rear base channels.

Setting Factory-Supplied Plenum

If the unit is provided with a factory plenum for field

mounting, use a forklift, slings, or other suitable lifting means.

Foam rubber gasketing is provided around the perimeter of the

unit top. Carefully set the plenum. Attach with mounting

hardware provided with the plenum.

Location/Service Access

To facilitate installation and provide service, and maintenance

access, follow the recommended clearances in Table 1.

Minimum clearances required by local, state, or federal codes

such as the NEC take precedence over those listed below.

Clearance is required to allow room for side filter access,

mechanical cleaning of the condenser tubes and economizer

coil, access to expansion valves and other control components,

and to allow for possible fan shaft or compressor removal.

Figure 2: Recommended Service and Maintenance Clearance

IMPORTANT

Only qualified personnel familiar with local codes and

regulations and experienced with this type of equipment

should perform installation and maintenance.

Check for

concealed damage as soon as possible.

CAUTION

Sharp edges and coil surfaces can cause personal injury.

Wear protective gear and avoid contact.

WARNING

Never allow any part of the unit to fall during unloading or

moving as this can cause equipment damage, severe

personal injury, or death.

CAUTION

Do not attempt to install dollies in the center of the unit.

Units can become unstable and tip over, causing injury

CAUTION

Do not move units in an upended position.

Internal components may tear away, causing injury.

Table 1: Recommended Clearances

Location Clearance length

Unit front 42"

Unit rear 24"

Motor location, right side 36"

Piping location, left side or right side 36"

Side without motor or piping 24"

Airflow

24"

42"

Evaporator Coil

Compressors

36"

24"

36"

AFD

Electrical Panel

Left

Side

Right

Side

Front

Back

Condenser

Cleanout

3 5 6 4 2

Motor

Airflow

24"

42"

Evaporator coil

Compressors

36"

24"

36"

AFD

Electrical panel

Left

side

Right

side

Front

Back

Condenser

cleanout

3 5 2 4 6

Motor

Independent

circuits

Dual circuits

McQuay IM 937 5

Installation

Removing Shipping Restraints

Mechanical restraints are used to secure the spring-mounted

fan during shipment. Remove the restraints and the shipping

blocks after the unit is set in its final location.

Refrigerant Piping—Pressure Relief Valves

All units have individual refrigerant circuits and each circuit is

provided with a spring loaded relief valve. The valve is set to

open when refrigerant pressure reaches 400 psig. The relief

valve accommodates a 1/2" flare connection for applications

where it is necessary to connect vent piping and run it outside

the building.

Water Connections

General

Due to the variety of piping practices, follow the

recommendations of local authorities. They can supply the

installer with the proper building and safety codes required for

proper installation.

For best performance, install the piping with a minimum

number of bends and elevation changes. Size piping to

minimize system pressure drop.

Piping should contain the following:

1 Vibration eliminators to reduce vibration and noise

transmission to the building.

2 Shutoff valves to isolate the unit from the piping system

during unit servicing.

3 Manual or automatic air vent valves at the high points of

the system.

4 Some means of maintaining adequate system water

pressure (e.g., expansion tank or regulating valve).

5 Temperature and pressure indicators located at the unit to

aid in servicing.

6 A strainer or some means of removing foreign matter,

which can damage the pump and shorten unit life, from the

water before it enters the pump. Such damage is not

covered by warranty. Place the strainer far enough

upstream to prevent cavitation at the pump inlet (consult

pump manufacturer for recommendations). Using a strainer

prolongs pump life and helps maintain system

performance.

Condenser Piping

1 Units can be specified with water and condensate

connections on either the left or right side of the unit.

2 All condensers are factory piped for a common condenser

water supply and a common condenser water return

connection.

3 Make field piping connections to factory-provided piping,

locating them as indicated on the unit submittal drawings.

Run the piping connections to the outside of the unit

cabinet. Connections are located behind a factory-mounted

shipping cover. All connections are copper sweat

connections as indicated on unit dimensional drawings.

4 Make supply and return water connections at the proper

locations as indicated by the dimensional drawings. The

supply (water in) connection is always the lower

connection.

5 Units with factory-mounted water side economizer should

not require head pressure control. The economizer typically

elevates the water temperature by 5°F to 10°F before

entering the condenser. Economizer cooling takes over

when the water is too cold for compressor operation.

Mechanical cooling is locked out below 55°F EWT.

6 If entering condenser water temperatures will go below

55°F, provide head pressure control. Fan cycling and/or

modulating discharge dampers on the cooling tower are

often used, or a 3-way bypass around the tower is used to

maintain condenser water temperature. If multiple units are

in the loop, it is generally more cost effective to use cooling

tower control to maintain the temperature at >55°F.

If a field-installed water regulating valve is placed in

service with the unit condenser, install it in the water line

leaving the condenser; it should shut down to prevent water

from siphoning out of the condensers. For systems where a

constant pumping head is required, install the water

regulating valve in a bypass line around the condensers. It

then must open on falling discharge pressure.

These typical systems, depending on the specific

application, must maintain a constant condensing pressure

regardless of temperature conditions and must provide

adequate head pressure for proper thermostatic expansion

valve operation. A minimum head pressure of 180 psi

(95°F condensing temperature) is recommended.

7 Condenser tube velocities must not exceed 10 feet per

second. Flow and velocity will be satisfactory if water

volumes do not exceed those shown in Table 2 on page 9.

WARNING

Connection plates can be used as rigging plates for the fan

section only. Do not use them for rigging the entire unit.

Unit can tip or fall and cause equipment damage, severe

personal injury, or death.

CAUTION

When refrigerant is vented to the outside of the building, install

the vent piping as recommended in ASHRAE Standard

15-1994. Failure to vent properly can result in personal injury.

6 McQuay IM 937

Installation

Figure 3: Condenser Regulating Valve (Refrigerant

Pressure Controlled)

Figure 4: Condenser Water Pressure Drop, SWP 018 to 040,

Independent Circuit

Figure 5: Condenser Water Pressure Drop, SWP 045 to 105,

Independent Circuit

Figure 6: Condenser Water Pressure Drop, SWP 018 to 095,

Dual Circuit

Figure 7: Economizer Water Pressure Drop, SWP 018 to

105

Condenser

Cooling

tower

60 80

100

200 300

Condenser Flow Rate (gpm)

Pressure Drop (ft H

12 HP

18 HP

24 HP

28 HP

32 HP

6 HP

40 HP

HP = total unit compressor horsepower

80 100

200 300

400 500

Condenser Flow Rate (gpm)

Pressure Drop (ft H

40HP

46HP

56HP

60HP

70HP

80HP

78HP

84HP

90HP

105HP

120HP

52HP

HP = total unit compressor horsepower

Condenser Flow Rate (gpm)

Pressure Drop (ft H

10 100 500

12 HP

16 HP

24–32 HP

36–32h HP

46HP

52HP

56HP

60 HP

HP = total unit compressor horsepower

10 100 500

018–028

035–040

045–095

105

P16

Condenser Flow Rate (gpm)

Pressure Drop (ft H O)

Note: 1. Includes coil, control valves and interconnecting piping.

2. Add this P to condenser P to obtain unit P for pump selection

McQuay IM 937 7

Installation

Figure 8: Water Regulating Valve Pressure Drop, Head

Pressure Control

Figure 9: Hot Water Coil Pressure Drop, SWP 018 to 040

Figure 10: Hot Water Coil Pressure Drop, SWP 045 to 105

Condensate Drain Connection

The condensate drain connection is 1 1/8" O.D.S. copper and

is located on the same end of the unit as the condenser water

connections. The drain is internally trapped at the factory,

requiring no external trap. Pitch the condensate line away from

the unit with a minimum slope of 1/8" per foot.

Keep drain pans and the drain trap clean by periodic cleaning.

A cleanout is provided as standard in the trap to aid in

cleaning.

0.1

100

500

Condenser Flow Rate (gpm)

Pressure Drop (ft H

018-040

045-095

Water Flow Rate (gpm)

Pressure Drop (ft H

100

200

018

023-028

035

040

Water Flow Rate (gpm)

Pressure Drop (ft H

100

200

045

105

065-095

055

8 McQuay IM 937

Installation

Duct Connections

Supply Air

To connect supply ductwork directly to the unit, first mount a

duct collar at the fan outlet, avoiding the mounting screws

located around the perimeter of the fan discharge opening. See

Figure 11. Fan discharge opening sizes are indicated on the

unit dimensional drawings. McQuay recommends a canvas

type connecting collar.

Install ductwork as shown in Figure 12. Duct take-offs that are

installed opposite to the direction of fan rotation result in an

associated system effect loss and reduced fan performance.

If a field-fabricated plenum is used, again, correctly orient duct

take-off locations to the rotation of the fan to minimize system

losses. Refer to unit dimensional drawings and Figure 11 for

plenum mounting size requirements. Canvas type connectors

are recommended at the duct connection to the plenum.

Units are also available with a factory-provided discharge

plenum. Supply duct connections to the plenum opening(s)

should include a canvas-type connector. Plenum opening sizes

and locations are indicated on the job submittal drawing.

Figure 11: Unit Top Detail

If a field-fabricated plenum is used, again correctly orient duct

take-off locations to the rotation of the fan to minimize system

losses. Refer to unit dimensional drawings and Figure 11. for

plenum mounting size requirements. Use canvas type

connectors at the duct connection to the plenum.

Units are also available with a factory-provided discharge

plenum. Supply duct connections to the plenum opening(s)

should include a canvas-type connector. Plenum opening sizes

and locations are indicated on the job submittal drawing.

Figure 12: Discharge Duct Configurations

Return Air

Return air to the unit can be ducted or free, as follows.

Ducted return

Attach return ductwork to the 2" flange around the perimeter

of the unit’s return air opening. Refer to Figure 13. Use a

canvas-type duct connecting collar. All ductwork connected to

the unit must be of adequate size and construction for the

application. Also use a canvas-type connector where the duct

penetrates the machine room wall(s). This helps prevent

vibration generated by air movement in the duct from being

transmitted out to the occupied spaces.

Note: Do not obstruct the unit access panel located below the

return opening.

Free return

Use the mechanical equipment room as a return plenum with

no hard connection at the unit.

Note: Some building codes do not allow using the mechanical

room as a return plenum. Check applicable local codes

for each installation.

Figure 13: Back Elevation

Filters are removable from the rear of the unit or through a side filter access

door located on the piping connection side. Length increases by

approximately 3 1/2" for piping connections with water economizer option.

Mechanical access panel(s) in the back of the unit start 2" below the return

duct opening. Do not obstruct the access panel(s). All dimensions are ±0.25".

Fan

discharge

opening

Centerline of

sheet metal

screws

Unit length

Unit

depth

1.7" (typ)

Filter Section

Economizer

Evaporator

Heater

Electrical panel

Filter Section

Economizer

Evaporator

Heater

Electrical Panel

2.0”

2.0” Typical

29”

K x L

Return Air Opening

Mechanical

Access

(See Notes)

(Optional)

Multi-Directional

Plenum

1” Neoprene

Isolation Pads,

Shipped Separately

McQuay IM 937 9

Physical Data

*Charge quantities listed are average. Actual charge quantity is dependent

on individual unit evaporator coil circuiting. Actual charge quantities are

stamped on each unit nameplate.

*Charge quantities listed are average. Actual charge quantity is dependent

on individual unit evaporator coil circuiting. Actual charge quantities are

stamped on each unit nameplate.

Table 2: SWP 018 Through SWP 105

Data

SWP model size

018 023 028 035 040 045 055 065 070 080 095 105

Compressor

Quantity 2, 3, or 4 2, 3, or 4 4 4 4 4 4 4 4 4 4, 6 6

Size See unit data plate

Evaporator coil

Face area (ft

) 11.8 15.3 17.7 23.3 27.7 30.7 36.1 41.5 46.3 51.1 55.9 63.2

Waterside economizer coil

Face area (ft

) 11.8 15.3 17.7 23.3 27.7 30.7 36.1 41.5 46.3 51.1 55.9 63.2

Max. wkg. press. (psig) 400 400 400 400 400 400 400 400 400 400 400 200

Hot water heating coil

Face area (ft

) 9.3 12.8 15.2 20.2 24.5 26.8 30.4 35.8 39.9 44.4 48.3 51.9

Rows 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1, 2 1 1 1

Fpi 12 12 12 1212121212 12 12 12 12

Electric heat

kW 34 34 34 34 34 68 68 68 68 68 68 68

Filters

(Quantity) Size 4" depth (6) 20×20

(2) 25×20

(6) 20×20

(2) 25×20

(6) 20×20

(2) 25×20

(10)

25×20

(10)

25×20

(12)

25×20

(12)

25×20

(18)

20×20

(6) 16×20

(12) 25×20

(3) 20×20

(15) 25×20

(6) 16×20

(15) 25×20

(4) 16×20

(17) 20×25

(1) 16×25

Evaporator fan

a. Standard fan TSP limit is 5.5 inches of water. Consult your local McQuay sales representative for applications beyond this range.

Quantity 1 1 1 1 1 1 1 1 1 1 1 1

Size 15 18 18 20 20 22 25 25 25 27 27 33

Minimum horsepower 5 7.5 10 10 15 15 20 20 20 25 30 40

Maximum horsepower 10 15 20 20 25 30 40 40 40 50 60 60

Minimum design cfm, CV 2950 3825 4425 5825 6925 7675 9025 10375 11575 12775 13975 15800

Min. design cfm, VAV 4720 6120 7080 9320 11080 12280 14440 16600 18520 20440 22360 25280

Maximum design cfm 7080 9180 10620 13980 16620 18420 21660 24900 27780 30660 33540 37920

Condenser

Waterside wkg. press. (psig) 400 400 400 400 400 400 400 400 400 400 400 400

Min. entering temp. (°F) 55° 55° 55° 55° 55° 55° 55° 55 55° 55° 55° 55°

Minimum GPM 25 41 53 66 69 94 105 105 121 134 138 180

Maximum GPM 88 108 125 159 166 215 237 237 251 349 358 493

Table 3: Single Compressor Circuit Charge, R-407C

Compressor (hp)

Refrigerant charge per

circuit (R-407C)*

Oil charge per

circuit (oz)

69 lbs60

10 13 lbs 110

13 17 lbs 140

15 21 lbs 140

20 25 lbs 224

Table 4: Tandem Compressor Circuit Charge, R-22

Compressor (hp)

Refrigerant charge per

circuit (R-22)*

Oil charge per

circuit (oz)

69 lbs66

10 14 lbs 112

13 18 lbs 154

15 22 lbs 154

20 27 lbs 256

(2) 6 17 lbs 120

(2) 7 19 lbs 120

(2) 8 22 lbs 280

(2) 9 26 lbs 280

(2) 10 26 lbs 280

(2) 13 30 to 33 lbs 280

(2) 15 36 to 40 lbs 280

Table 4: Tandem Compressor Circuit Charge, R-22

Compressor (hp)

Refrigerant charge per

circuit (R-22)*

Oil charge per

circuit (oz)

10 McQuay IM 937

Physical Data

Dimensional Data

Table 5 contains dimensions that vary from unit to unit,

marked with letters (A, B, C, etc.) in the figures. Depth, length,

and height dimensions do not include lifting lugs, the handle,

latch, or fastener extensions. For shipping dimensions, the skid

adds 4" (102 mm) to depth, 8" (204 mm) to the length, and 4"

(102 mm) to the height.

For units with the optional plenum, the plenum can ship

separately. All openings are on the plenum are centerline. For

additional information, refer to the submittal drawing. (See

Figures 14 and 15.)

Service connections are determined when facing the front of

the unit. Left-hand connections are standard; right-hand

connections are optional. Please indicate on the unit submittal.

Unit sizes 018, 023, and 028 have a single mechanical access

panel in the bottom front and bottom back. (See Figures 16,

17, 18, and 19.)

Figure 14: Front Left Side (CW) Discharge with Optional

Multi-Directional Plenum

Figure 15: Back Left Side (CCW) Discharge with Optional

Multi-Directional Plenum

Note: *For F vintage units, subtract 1.88.

Table 5: Dimensions

Basic unit 018 023 028 035 040 045 055 065 070 080 095 105

A Depth 72.00 72.00 72.00 72.00 72.00 81.00 81.00 81.0 81.00 84.00 84.00 96.00

B Length 84.00 84.00 84.00 100.00 100.00 120.00 120.00 120.0 132.00 144.00 156.00 156.00

D Height 82.00 82.00 82.00 82.00 82.00 82.00 82.00 88.0 88.00 88.00 88.00 96.00

F Fan discharge 18.62 21.88 21.88 24.75 24.75 27.25 31.25 31.25 31.25 34.25 34.25 47.25

G Fan discharge to shaft 15.88 18.88 18.88 24.75 24.75 27.25 31.25 31.25 31.25 34.25 34.25 34.94

H Fan discharge location 32.69 31.06 31.06 37.62 37.62 46.38 44.38 44.38 50.38 54.88 60.88 54.40

J Fan discharge location 22.50 18.81 18.81 20.12 20.12 21.06 21.32 21.32 21.32 23.82 23.82 33.76

K Return opening height 41.44 41.44 41.44 51.44 51.44 51.44 51.44 62.20 62.20 62.20 62.20 70.20

L Return opening length 80.00 80.00 80.00 96.00 96.00 116.00 116.00 116.00 128.00 140.00 152.00 152.00

M Base of return opening 28.62 28.62 28.62 28.62 28.62 28.62 28.62 23.87 23.87 23.87 23.87 23.87

N Water out/in (ODS) 2 1/8 2 1/8 2 1/8 2 5/8 2 5/8 2 5/8 3 1/8 3 1/8 3 1/8 3 1/8 3 1/8 3 1/8

P 1-row HW conn (ODS) 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 2 1/8 2 1/8 2 1/8 2 1/8

P 2-row HW conn (ODS) 1 5/8 1 5/8 1 5/8 1 5/8 1 5/8 2 1/8 2 1/8 2 1/8 2 1/8 — — —

Q Condenser outlet* 16.5 16.5 16.5 16.516.516.516.816.816.816.816.817.76

R Condenser inlet* 10.5 10.5 10.5 10.5 10.5 10.8 10.8 10.8 10.8 10.8 10.8 11.75

K x L return air

Filter s ection

Economizer

Evaporator

Heater

Electrical panel

Multi-directional

plenum, optional

(Plenun can ship separately.

All openings are on the

plenum centerline.

For additional information,

see submittal drawings.)

3.25"

Outlet

K x L return air

Filter s ection

Economizer

Evaporator

Heater

Electrical panel

3.25”

Outlet

9.63"

(18-95)

10.31

(105)

Multi-directional

plenum, optional

(Plenun can ship separately.

All openings are on the

plenum centerline.

For additional information,

see submittal drawings.)

McQuay IM 937 11

Physical Data

Figure 16: Unit Front Plan

Figure 17: Front Elevation

Figure 18: Back Elevation

Figure 19: Left Side

Figure 20: Discharge Plenum (optional)

Left side

piping

connections

(See Notes)

(Optional)

Right side

piping

connections

(See notes below.)

Supply

fan motor

Return air

Power

entry

3 1/8"

Disconnect

switch (optional)

MicroTech II panel

AFD (optional)

Electrical

access

Mechanical

access

76"

Power entry

7/8" pilot K.O.

Notes: Unit sizes 018, 023, and 028 have a single mechanical access panel.

M (see Dimensions table)

2. 0 "

2.0" Typical

H H

29"

K × L

Return air opening

Mechanical

access

(optional)

Multi-directional

plenum*

1" Neoprene isolation pads,

shipped separately

Notes: Unit sizes 018, 023, and 028 have a single mechanical access panel.

Select unit arrangement on the unit

selection. Plenum can ship separately.

All openings are on plenum center line.

For additonal information, refer to

submittal drawing.

Lifting lug

1" typ.

A/2

38.5"

(N) Water in

(N) Water out

1 1/8" ODS drain

K × L return air

(optional)

Multi-directional

plenum*

44.5"

(P) Hot water in

(P) Hot water out

Notes: Service connections determined when facing the front of the unit.

Left-hand standard, right-hand optional. Please indicate on the unit submittal.

Select unit arrangement on the unit

selection. Plenum can ship separately.

All openings are on plenum center line.

For additonal information, refer to

submittal drawing.

Plan view

Left/right elevation

Front/back elevation

Length

Dept h

2" Min

Height

Unit size Length (in) Depth (in) Height (in)

018 to 028 84 72 23, 29, 35, 41

035 to 040 100 72 23, 29, 35, 41

045 to 065 120 81 29, 35, 41

070 132 81 29, 35, 41

080 144 84 29, 35, 41

095 to 105 156 84 29, 35, 41

12 McQuay IM 937

Physical Data

Unit Weights

Table 6: Unit and Component Weight (lbs)

Unit weights

Unit size

018 023 028 035 040 045 055 065 070 080 095 105

Basic configuration

SWP basic unit

2226 2313 2318 2638 2643 3110 3279 3406 3734 4021 4246 4766

Filters

4" 30% or 65% efficiency 38 38 38 55 55 66 66 79 87 96 104 112

Evaporator coil

Heaviest coil 250 294 321 417 468 506 577 642 693 755 819 926

Water economizer coil

4 row, 12 fpi 306 338 357 458 493 520 598 648 678 723 820 927

Water weight 51 66 75 94 111 119 150 168 187 203 218 281

Hot water coil

1 row, 12 fpi 71 97 114 130 158 160 170 200 328 337 345 371

Water weight 16 20 23 28 32 37 41 49 55 59 62 62

Electric heat

34 kW 2020202020—————— —

68 kW — — — — — 40 40 40 40 40 40 40

Supply fan motors

3 hp ODP 71—————————— —

5 hp ODP 82—————————— —

7.5 hp ODP 124124————————— —

10 hp ODP 144144144144——————— —

15 hp ODP —185185185185185————— —

20 hp ODP — — 214 214 214 214 214 214 214 — — —

25 hp ODP — — — — 266 266 266 266 266 266 — —

30 hp ODP — — — — — 310 310 310 310 310 310 310

40 hp ODP ——————404404404404404404

50 hp ODP —————————452452452

60 hp ODP ——————————620620

a. Base weight includes supply fan without motor.

b. Water economizer weight includes valves and piping.

c. The values in this table do not include water weight.

d. Hot water coil weight includes valve and piping.

McQuay IM 937 13

Physical Data

Supply fan motors, continued

3 hp TEFC 72—————————— —

5 hp TEFC 85—————————— —

7.5 hp TEFC 140140————————— —

10 hp TEFC 170170170170——————— —

15 hp TEFC —235235235235235————— —

20 hp TEFC — — 300 300 300 300 300 300 300 — — —

25 hp TEFC — — — — 330 330 330 330 330 330 — —

30 hp TEFC — — — — — 390 390 390 390 390 390 390

40 hp TEFC ——————510510510510510510

50 hp TEFC —————————570570570

60 hp TEFC ——————————850850

Compressor/condenser assembly

Water weight

(4) 6 hp 43 777 777 777 777 777 777 777 777 777 777 777 777

(4) 7 hp 57 786 786 786 786 786 786 786 786 786 786 786 786

(4) 8 hp 66 1215 1215 1215 1215 1215 1215 1215 1215 1215 1215 1215 1215

(4) 9 hp 74 1272 1272 1272 1272 1272 1272 1272 1272 1272 1272 1272 1272

(3) 6 hp, (1) 10 hp 57 843 843 843 843 843 843 843 843 843 843 843 843

(2) 6 hp, (2) 10 hp 66 974 974 974 974 974 974 974 974 974 974 974 974

(1) 6 hp, (3) 10 hp 74 1115 1115 1115 1115 1115 1115 1115 1115 1115 1115 1115 1115

(4) 10 hp 95 1287 1287 1287 1287 1287 1287 1287 1287 1287 1287 1287 1287

(2) 10 hp, (2) 13 hp 106 1376 1376 1376 1376 1376 1376 1376 1376 1376 1376 1376 1376

(4) 13 hp 118 1464 1464 1464 1464 1464 1464 1464 1464 1464 1464 1464 1464

(2) 13 hp, (2) 15 hp 129 1575 1575 1575 1575 1575 1575 1575 1575 1575 1575 1575 1575

(4) 15 hp 141 1684 1684 1684 1684 1684 1684 1684 1684 1684 1684 1684 1684

(2) 15 hp, (2) 20 hp 152 1982 1982 1982 1982 1982 1982 1982 1982 1982 1982 1982 1982

(4) 20 hp 190 1970 1970 1970 1970 1970 1970 1970 1970 1970 1970 1970 1970

(6) 13 hp 167 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010 2010

(3) 13 hp, (3) 15 hp 178 2135 2135 2135 2135 2135 2135 2135 2135 2135 2135 2135 2135

(6) 15 hp 188 2260 2260 2260 2260 2260 2260 2260 2260 2260 2260 2260 2260

(3) 15 hp, (3) 20 hp 209 2419 2419 2419 2419 2419 2419 2419 2419 2419 2419 2419 2419

(6) 20 hp 229 2579 2579 2579 2579 2579 2579 2579 2579 2579 2579 2579 2579

Discharge plenum

23" high 551551551616616—————— —

29" high 636 636 636 711 711 862 862 862 922 1003 1064 1064

35" high 719 719 719 804 804 975 975 975 1042 1134 1203 1203

41" high 805 805 805 899 899 1090 1090 1090 1166 1269 1346 1346

a. Base weight includes supply fan without motor.

b. Water economizer weight includes valves and piping.

c. The values in this table do not include water weight.

d. Hot water coil weight includes valve and piping.

Table 6: Unit and Component Weight (lbs) (continued)

Unit weights

Unit size

018 023 028 035 040 045 055 065 070 080 095 105

14 McQuay IM 937

Electrical Data

Field Wiring

General

Wiring must comply with all applicable codes and ordinances.

McQuay’s product warranty does not cover equipment failures

caused or contributed to by wiring not in accordance with

specifications. An open fuse or tripped MMP indicates a short,

ground or overload. Before replacing a fuse or restarting a

compressor or fan motor, locate the trouble and correct. Use

copper wire for all power lead terminations.

A single power terminal block is provided as standard, and

wiring within the unit is done in accordance with UL 508.

Each branch circuit within the control panel is individually

protected. A single field-supplied disconnect is required or a

unit-mounted, nonfused disconnect can be ordered with the

unit.

A 7/8" knockout is located on the right-hand unit upright for

locating unit power entry. 24 V field connections are suitable

for Class II wiring.

Unit Disconnect

Disconnecting means are addressed by Article 440 of the

National Electric Code (NEC), which requires “disconnecting

means capable of disconnecting air conditioning and

refrigerant equipment including motor-compressors, and

controllers, from the circuit feeder.” Select and locate the

disconnect switch within the NEC guidelines. Location

requirements per NEC are that the disconnect is located in a

readily accessible position within sight (50 feet) of the unit. A

factory-mounted, nonfused disconnect is available.

Return Air and Outside Air Sensors

All units are provided with a return air sensor. It is connected

to the input control board and is coiled and placed behind the

access panel, to the right of the control panel of the unit for

shipment. Field install it in the return air stream for proper unit

operation. The return air sensor is connected to the unit’s input

board at location AI-2.

The outside air sensor is optional and can be ordered with the

unit. It ships loose in a package and is located on the floor of

the fan section. The outside air sensor is field wired to terminal

strip TB2. It is connected at terminals 122 and 123.

The mixed air temperature sensor is already installed at the

inlet of the unit.

Mount the sensors in areas that are exposed to representative

temperature conditions. Mount them at a position that has

good air mixing and does not have stratification. Sensors can

be mounted in the ductwork using a grommet (see Figure 21).

Figure 21: Return/Outside Air Sensor Mounting

Grommet

Sensor

Ductwork

Air flow

Table 7: Compressor Motors

Compressor hp Refrigerant

208/60/3 230/60/3 460/60/3 575/60/3

RLA LRA RLA LRA RLA LRA RLA LRA

6 R-22 14.9 156 14.9 156 7.4 75 6.0 54

R-407 14.7 156 14.7 156 7.3 75 5.8 54

7 R-22 17.6 164 17.6 164 9.6 100 7.7 78

R-407————————

8 R-22 22.1 189 22.1 189 11.0 99 8.8 74

R-407————————

9 R-22 24.8 232 24.8 232 12.4 125 9.9 100

R-407————————

10 R-22 28.4 278 28.4 278 14.2 127 11.4 100

R-407 27.5 278 27.5 278 13.8 127 11.0 100

13 R-22 32.1 350 32.1 350 16.0 158 13.1 125

R-407 32.5 350 32.5 350 16.2 158 13.0 125

15 R-22 40.1 425 40.1 425 20.0 187 16.0 148

R-407 39.6 425 39.6 425 19.8 187 15.8 148

20 R-22 65.4 360 65.4 360 32.7 180 26.2 144

R-407 65.4 425 65.4 425 32.7 187 — —

McQuay IM 937 15

Electrical Data

Table 8: Electric Heaters

SWP unit size

208 V, 60 Hz, 3 phase 230 V, 60 Hz, 3 phase 400 V, 50 Hz, 3 phase 460 V, 60 Hz, 3 ph 575 V, 60 Hz, 3 phase

kW MBh FLA kW MBh FLA kW MBh FLA kW MBh FLA kW MBh FLA

018 to 040 27.8 94 77.2 34 116 85.6 25.7 88 37.2 34 116 42.8 34 116 34.2

045 to 105 55.6 190 154.4 68 232 170.9 51.4 175 74.4 68 232 85.6 68 232 68.4

Table 9: SAF Motor Nameplate Amperage

Horsepower Type

208/60/3 230/60/3 400/50/3

460/60/3 575/60/3

FLA FLA FLA FLA FLA

3 High efficiency 9.9 9.0 4.5 4.5 3.4

Premium efficiency 9.3 8.2 4.1 4.1 3.1

5 High efficiency 16.1 14.0 7.0 7.0 5.3

Premium efficiency 15.7 13.6 6.8 6.8 5.2

7.5 High efficiency 25.0 21.6 10.8 10.8 8.2

Premium efficiency 22.3 20.0 10.0 10.0 7.4

10 High efficiency 33.0 28.0 14.0 14.0 11.0

Premium efficiency 29.0 25.8 12.9 12.9 10.3

15 High efficiency 44.8 40.6 20.3 20.3 16.2

Premium efficiency 43.4 37.8 18.9 18.9 14.1

20 High efficiency 61.0 50.0 25.0 25.0 20.0

Premium efficiency 57.0 49.0 24.5 24.5 18.9

25 High efficiency 74.0 62.0 31.0 31.0 24.3

Premium efficiency 70.0 61.0 30.5 30.5 24.2

30 High efficiency 86.5 75.0 37.5 37.5 30.0

Premium efficiency 83.3 72.4 36.2 36.2 29.8

40 High efficiency 117.0 102.0 51.0 51.0 40.0

Premium efficiency 110.0 96.0 48.0 48.0 38.0

50 High efficiency 140.0 124.0 62.0 62.0 49.2

Premium efficiency 137.0 120.0 60.0 60.0 47.5

60 High efficiency 154.0 144.0 72.0 72.0 57.4

Premium efficiency 160.0 140.0 70.0 70.0 56.0

a. 460/60/3 motors are used. Derate nameplate horsepower to 0.83 to obtain actual horsepower.

16 McQuay IM 937

Electrical Data

Supply Power Wiring

1 Units require three-phase power supply.

2 Allowable voltage tolerances:

a 60 Hertz

Nameplate 208 V: Min. 187 V, Max. 229 V

Nameplate 230 V: Min. 207 V, Max. 253 V

Nameplate 460 V: Min. 414 V, Max. 506 V

Nameplate 575 V: Min. 518 V, Max. 632 V

b 50 Hertz

Nameplate 400 V: Min. 342 V, Max. 418 V

3 Power lead wire sizing:

a For units with cooling capability (all concurrent loads)

with or without hot water heating and circuits with

motor loads only:

MCA = 1.25 (largest motor RLA or FLA) + other loads

+ 2 amps

b For units with cooling capability and nonconcurrent

electric heat capability:

In the cooling mode, the loads are composed of supply

fan motor and compressors. In heating mode, the

loads are composed of supply fan motor and electric

heater. The MCA is calculated for unit running in

either mode; the highest value obtained is used for the

MCA.

– For unit in cooling mode:

MCA = 1.25 (largest RLA or FLA) + other loads + 2

amps

– For unit in heating mode, below 50 kW

MCA = 1.25 (electric heat FLA + fan FLA) + 2 amps

– For unit in heating mode, above 50 kW

MCA = 1.25 (SAF amps) + (electric heat) + 2 amps

4 Size wires in accordance with Table 310-16 of the National

Electrical Code.

5 Size wires for a maximum of 3% voltage drop.

Lug Sizes

Note: Use copper wire only.

Control Center

All electrical controls are enclosed in a central control center

located at the front of the unit. High voltage components

include:

• Fan motor contactor, M30/M10

• Fan motor protector, MMP9, MMP10, MMP30

• Fan motor circuit breaker, CB10

• Compressor contactors, M1–M6

• Compressor protector, MMP1–MMP6

• Electric heat contactors, M11–M16

• Transformer, T1, T2, T3

• Disconnect switch, DS1–DS2

• Power block, PB1–PB2

If the optional disconnect switch is provided, the switch handle

is visible and accessible without removing any safety or access

panels.

Low voltage components include:

• MicroTech III

main control board, MCB

• MicroTech III

expansion modules

• Duct static pressure sensor, SPS1

• Optional 2nd duct static pressure sensor, SPS2

• Optional BACnet

/IP communication module

• Optional BACnet MS/TP communication module

• Optional L

ONWORKS

communication module

Located on the face of the unit is the interactive MicroTech III

keypad/display, unit switch, system indicator light and power

indicator.

Note: IM 919 has additional layouts of the control center.

Table 10: Lug Sizes for Single Disconnect

DIsconnect size (amps) Lug size

100 #14-1/0

150 #8-3/0

250 3/0-350 MCM

400 (2) #4-250 MCM

600 (3) 3/0-500 MCM

Table 11: Lug Sizes for Power Block

Power block size (amps) Lug size

420 #2-600 MCM

760 (2) #4-500 MCM

McQuay IM 937 17

Electrical Data

Figure 22: Typical 460 Volt, 6-Compressor Control Center Layout, High and Low Voltage Compartments

18 McQuay IM 937

Electrical Data

Figure 23: A-A Section Detail, Typical 460 Volt, 6

Compressor Control Center Layout

Electrical Legend

ID Description

Standard

location

ACT3 Actuator motor, economizer Comp/cond section

AFD10 Adjustable frequency drive,

supply fan

Front assembly

CB10 Circuit breaker, supply fan Main control box

CCB1, 2 Compressor control boards,

refrig. circuits

Main control box

DAT Discharge air temperature

sensor

Discharge section

DHL Duct hi-limit Main control box

DS1 Disconnect, total unit or cond/

heat

Main control box

DS2 Disconnect, SAF/RAF/controls Main control box

F1A, B Fuse, control circuit transformer

(T1), primary

Main control box

F1C Fuse, control circuit transformer

(T1), secondary

Main control box

FB11, 12 Fuseblock, electric heat (top

bank)

Main control box

FB13, 14 Fuseblock, electric heat (bot.

bank)

Main control box

HL11A, HL11B Hi-limits, pwr, elec heaters (top

bank)

Heat section,

electric

HL12A, HL12B Hi-limits, pwr, elec heaters (bot.

bank)

Heat section,

electric

HP1–6 Hi-pressure controls, refrig On compressors

LP1–6 Low-pressure controls,

refrigeration

On compressors

M1–6, M21–26 Contactor, compressor Main control box

M9 M10 Contactor, supply fan Main control box

M30 Contactor, reversing, VFD

bypass, supply fan

IVFD bypass box

MCB Microprocessor circuit board Main control box

MJ Mechanical jumper All control boxes

MMP1–6,

MMP21–26

Manual motor protector,

compressors

Main control box

MMP9–10 Manual motor protector, supply

fan

Main control box

MP1–6 Motor protector, compr.#1–6 On compressors

OAT Outside air temperature sensor Shipped loose

PB1, 2 Power block, power distribution Main control box

PB10 Power block, supply fan Main control box

McQuay IM 937 19

Electrical Data

PC5 Pressure control, clogged filter Main control box

PC7 Pressure control, proof airflow Main control box

PB10 Power block, supply fan Main control box

PVM1, 2 Phase voltage monitor Main control box

R1–6 Relay, compressor high

pressure

Main control box

R62, 63, 65 Relay, use on specials Main control box

R70–79 Relay, use on specials Main control box

RAT Return air temperature sensor Main control box

S1 Switch, system on/off Main control box

S4 Switch, VFD bypass, on/ off Main control box

S7 Switch, local on/auto/off to

controller

Keypad

SPS1, 2 Static pressure sensors, duct/

building

Main control box

PSR1, 2 Pressure transducer, head

pressure control

Condenser section

T1 Transformer, main control (line/

115 V (ac))

Main control box

T2 Transformer, control input (115/

24 V (ac))

Main control box

T3 Transformer, control output

(115/24 V (ac))

Main control box

T4 Transformer, UV lights Main control box

TB1 Terminal block, internal Main control box

TB2 Terminal block, field, Class 2 Main control box

TB3 Terminal blocks, factory Main control box

TB4 Terminal block, field, 115 V (ac) Main control box

ID Description

Standard

location

UV Ultra-violet light(s) Coil/discharge

section

VM1 Valve motor #1, heating Heat section

ZNT1 Zone temp. sensor, setback Field installed

ID Description

Standard

location

200/ H200

1. Field wiring

3. Shielded wire/cable

4. Main control box

terminals

5. Auxilliary box

terminals

6. Field terminals

7. Plug connector

8. Wire/harness number

General Notes

2. Factory wiring

9. Wire nut/ID

WN7

20 McQuay IM 937

Electrical Data

Typical Wiring Schematics

Figure 24: Main Power

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McQuay SWP Series Installation and Maintenance Manual

Brand: McQuay

Model: SWP Series

Category: Split-system air conditioners

Type: Installation and Maintenance Manual

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McQuay SWP Series Installation and Maintenance Manual

McQuay SWP Series Installation and Maintenance Manual

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