McQuay Incremental MQT Series Installation And Maintenance Data

Brand: McQuay

Model: Incremental MQT Series

Category: Split-system air conditioners

Type: Installation And Maintenance Data

IM 354 / Page 1

Bulletin No. IM 354-4

June 1995

Form No. 802048241

Installation and

Maintenance Data

MQT (Type RS)

Incremental

Heat Pump

Model Nomenclature

Product Family

MQT (previously Type RS)

Unit Size

06 = Nominal 6,000 Btuh cooling

09 = Nominal 9,000 Btuh cooling

11 = Nominal 11,000 Btuh cooling

14 = Nominal 14,000 Btuh cooling

Vintage Designation

B (Sizes 06, 09, 11)

C (Size 14)

Unit Type

A = Air conditioner with electric heat

B = Air conditioner with hydronic heat

C = Heat pump with supplemental electric heat

MQT 09 B C 5 B

Heater Code

A = 2.0 kW electric heat

B = 3.2 kW electric heat

C = 4.8 kW electric heat

G = Steam heat

W = Hot water heat

Voltage

3 = 230/60/1

5 = 208/60/1

7 = 265/60/1

Page 2 / IM 354

Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes and

regulations, and experienced with this type of equipment. Caution: Sharp edges and coil surfaces are a potential

injury hazard.

Conditioner Description

The McQuay MQT heat pump is designed and built for

through-the-wall installation in either new or existing build-

ings. The self-contained refrigerant system delivers cooling

or reverse cycle heating depending on which is called for and

has back-up electric resistance heating.

1. Subbase — Optional on 208 or 230 volt units; standard on

265 volt units. Shipped in a separate carton.

2. Louver Frame — Optional; shipped in separate carton.

3. Room Cabinet/Wall Sleeve — Shipped in palletized car-

ton with heating/cooling chassis.

4. Outdoor Louver — Shipped in separate carton.

5. Heating/Cooling Chassis — Shipped in palletized carton

with room cabinet/wall sleeve.

Figure 1.

⁄4"

(527mm)

Min. 9

⁄4"

(248mm)

Wall Line

⁄8"

(1140mm)

⁄8"

(35mm)

⁄4"

(95mm)

Filter

⁄2"

(1080mm)

⁄16"

(30mm)

⁄2"

(140mm)

⁄8" to 15

⁄8"

(111 to 397mm)

⁄4"

(184mm)

⁄8"

(416mm)

4"–4

⁄2"

(102 –114mm)

⁄8" (10mm) Louver-Stamped (Standard) or

⁄8" (29mm) Louver-Extruded (Optional)

⁄8" (10mm)

Louver-Stamped

(Standard) or

⁄8" (29mm)

Louver-Extruded

(Optional)

Note:

4" minimum space requirement between

underside of unit and floor for return air.

¿ Subbase is optional on 208 and 230

volt units but standard on 265 volt.

¡ A

⁄4" (19mm) drip lip.

¬ Optional condensate connection.

Figure 2. Conditioner — wall mounted

⁄4"

(248mm)

Min.

4" (102mm)

Min.

2" x 4" (51 x 102mm)

Junction Box

All wiring should be done in accordance with all local and

National Electrical Code requirements. The conditioners are

supplied as follows:

1. 208 or 230 Volt Models — Supplied with an attachment

cord and plug which exit from beneath the conditioner on

the right side through a grommeted hole. The cord has a

usable length of 48" (1220mm) from where it exits the

conditioner. The use of an extension cord to increase the

length of the plug/cord set is not recommended. The

attachment plug size should be used to determine the

Electrical Service

circuit ampacity and overcurrent protection. Time delay

fuses are recommended to avoid nuisance tripping. An

optional subbase is available and contains a junction box

for a field mounted receptacle. Suggested outlet loca-

tions are as follows:

a. Wall Mounted Conditioner — Generally mounted

beneath the conditioner on or recessed in the wall so

it is concealed by the conditioner overhang (see Figure

2). The space under the conditioner must be at least 4"

(102mm) high.

IM 354 / Page 3

b. Conditioner with Subbase — Where the optional

subbase is used, the rectangular knockout in the right

front bottom of the wall sleeve is removed to allow the

subbase junction box to be mounted directly beneath

the wall sleeve (see Figure 3).

2. 265 Volt Models — Permanently wired to the subbase

junction box receptacle. A short interconnecting cord is

furnished from the chassis to reach this receptacle to

preserve the ease of quick chassis changeout. The condi-

tioner is marked with the minimum circuit ampacity and

maximum fuse size. The subbase and receptacle are

standard factory supplied equipment on these models.

Incremental air conditioners can be installed in various ways.

This instruction is based on the use of an optional subbase,

an optional louver frame and an optional condensate drain.

The following is a recommended installation procedure:

Optional Condensate Drain

If it is used, provisions should be made in the stub-up area for

the condensate connection (see Figure 4). Since the MQT

Heat Pump has a reverse cycle heating feature, it generates

condensate during the heating season which may not be

completely removed by the normal condensate disposal

system. A condensate drain opening is therefore provided at

the left bottom front of the heating/cooling chassis; it is

shipped from the factory with a rubber plug inserted. An

optional condensate drain kit is available, and it is recom-

mended that it be used to connect the chassis to condensate

drain (by others). A knockout is provided in the basepan of

the wall sleeve for this purpose.

Optional Subbase

Whenever a subbase is used, it must be installed prior to the

room/cabinet wall sleeve.

The subbase, provided in four pieces, is adjustable from

⁄8" to 15

⁄8" (111 to 397mm) in depth to accommodate

various projections of the conditioner into the room. The

standard subbase height is 4" (102mm) with adjustable

leveling bolts to 4

⁄2" (114mm). In all cases, the subbase

provides a 5

⁄2" (140mm) toe space inset from the front edge

of the conditioner. Thus, for applications where the minimum

⁄4" (248mm) conditioner projection into the room is utilized,

only the 4

⁄8" (111mm) deep front section of the subbase is

required. The adjustable side extension pieces should be

discarded. The adjustable “L” shaped extension pieces are

used when the conditioner projection into the room is greater

that 9

⁄4" (248mm). The scoring at two-inch intervals on the

extension pieces can be broken at the desired depth. The

extensions are secured with two screws on each side to the

front section on the subbase. In all cases the back of the

subbase remains open and is butted against the wall (see

Figures 4 and 5).

Optional Subbase & Codensate Drain Installation

Figure 4.

Figure 3. Conditioner — with subbase

*Note: These are actual unit dimensions. The rough

opening through the wall should be at least

⁄4" (6mm)

larger without louver frame, or at least

⁄8" (16mm)

larger when louver frame is used.

Unit Outside

Dimensions

Optional Subbase

Optional Subbase Front

Access Cover

Opening for

Condensate Drain

Receptacle

Leveling Bolt

Screw

Receptacle

Cover

Centerline of Wall

Opening/Subbase

Screw

⁄

(416mm)*

Equipment

Ground Wire

Wall Opening

Electrical

Stub-up Area

⁄

" (1140mm)*

Page 4 / IM 354

5. Complete the electrical work in the subbase and the

junction box.

6. Rough-in the condensate drain (if used) to the left front

side of the subbase. A connection may be made between

this field supplied drain and the condensate drain which

will be installed later at the underside of the wall sleeve.

7. The subbase cavity should be fitted with a piece of 6"

(152mm) fiberglass batting to prevent condensation on

the wall sleeve basepan.

Subbase Installation:

1. The subbase provides a 1

⁄16" (30mm) inset on the sides of

the conditioner. Locate the subbase on the floor and align

its center line with the center line of the wall opening (see

Figure 5).

2. Determine the depth of the side extension pieces desired

and break at the proper score line. Insert the extension

pieces into the front assembly and secure with two short

screws on each side (see Figure 4).

3. Secure the assembly to the floor.

4. Insert the two leveling bolts into the subbase, one on each

end. Retain the two long screws to secure the wall sleeve

after it is installed.

Optional Louver Frame Installation

Whenever a louver frame is used, it must be installed prior to,

or at the same time as, the room cabinet/wall sleeve. It must

be level and square (see Figure 6).

1. Apply a bead of good caulking compound around the four

inner surfaces of the louver frame vertical flange (see

Figure 7).

2. Insert the sleeve of the louver frame into the wall opening

from the exterior of building and apply firm pressure so the

caulked louver frame vertical flanges are snug against the

exterior building surface.

3. Secure the louver frame to the wall through the sides and

top of the sleeve. Never secure the louver frame through

the bottom. Note: The louver frame may also be secured

from inside the room cabinet/wall sleeve by screws driven

through the sides and top of the louver frame sleeve.

Pre-Installation Conditioner Preparation

1. Remove the outer carton of the room cabinet/wall sleeve/

chassis package and inspect the conditioner for shipping

damage. Report any damage to the carrier.

2. Save the large inner cardboard liner which can be reused

to cover the installed conditioner until its ready for use. It

is scored, and can be easily folded to the proper depth for

the particular room cabinet exposure into the room.

Room Cabinet/Wall Sleeve Installation

Figure 5.

3. Remove the front panel and filter. Refer to page 7 for

details.

4. Remove the retaining clips at the bottom rear of the

chassis which hold the chassis in place during shipment.

5. Remove the chassis by pulling evenly at the positions

indicated as “Hand Holds” only. Caution: Do not pull on

the evaporator fan housings or control box.

6. Check the nameplate data on the chassis to ensure that

the correct jobsite distribution has been made with re-

spect to the heating and cooling capacities. Corner rooms

normally require larger capacities.

⁄16" (14mm)

Outline of Cabinet/Wall Sleeve

0" to 11

⁄4"

(0 to 286mm)

⁄8"

(365mm)

⁄4"

(540mm)

⁄4"

(540mm)

⁄8"

(117mm)

⁄16"

(243mm)

⁄16"

(65mm)

Electrical

Junction Box

⁄8" (111mm)

⁄16" (30mm)

Condensate Drain

Rough-in Area

⁄2"

(64mm)

⁄8" (16mm)

3" (76mm)

(127mm)

⁄8"

(581mm)

⁄2" (89mm)

⁄2" (140mm)

Electrical

Rough-in Areas

Top View

Figure 6.

*Outside dimensions

Louver Frame

⁄8"

(473mm)

⁄8"

(422mm)*

⁄8"

(86mm)

⁄16"

(2mm)

⁄8" (1197mm)

⁄4" (1150mm)*

IM 354 / Page 5

Panel and Thin Wall Application

1. Install the subbase as described in the subbase installa-

tion section.

2. Install the louver frame as described in the louver frame

installation section.

3. Position the room cabinet/wall sleeve in the louver frame

opening and on the subbase. The rear face of the cabinet

should be recessed from the outside edge of the louver

frame by the depth of the louver to be installed (Figure 7).

4. Remove the rectangular knockout in the base pan of the

wall sleeve.

5. Adjust the subbase leveling bolts so the room cabinet/

wall sleeve is level or tilted a maximum of

⁄8" (3mm)

downward to the outside. Secure the room cabinet/wall

sleeve to the subbase with the two long screws retained

from the subbase assembly (see Figure 4). Holes,

⁄32" in

diameter, have been added to each side of the room

cabinet/wall sleeve as a provision for securing the sleeve

in the wall opening. Each hole is located 2" (51mm) down

from the top and 2" (51mm) in from the rear of the sleeve.

These holes or other non-perforated locations in the sides

and/or top of the sleeve may be used to fasten the sleeve

to the wall from the inside. Never secure the room

cabinet/wall sleeve to the wall through the bottom.

6. Caulk the outdoor joint between the conditioner and wall

opening or louver frame around the top, bottom, and both

sides. Do not permit caulking to block weep holes.

Masonry and Thick Wall Application

Preparation of Wall Opening — In new construction, the

room cabinet/wall sleeve can be built into the building wall as

construction progresses, or openings can be left for later

installation. A lintel must be used to support any brick or

masonry work above the conditioner.

1. For installations with an optional subbase, install the

subbase as described in the subbase installation sec-

tion.

2. Set the room cabinet/wall sleeve in soft mortar and

position it in the wall opening. The rear face of the

conditioner should be recessed from the outside edge of

the wall opening by the depth of the louver to be installed

(see Figure 8). The center of gravity of the conditioner is

⁄2" (241mm) from the rear face. For wall mounted

conditioners, the center of gravity must be within the

load bearing portion of the wall; otherwise some method

of support is required.

3a. Installations without a subbase. Level or pitch the

room cabinet/wall sleeve a maximum of

⁄8" (3mm) down-

ward to the outside. Holes,

⁄32" in diameter, have been

added to each side of the room cabinet/wall sleeve as a

provision for securing the sleeve in the wall opening.

Each hole is located 2" (51mm) down from the top and

2" (51mm) in from the rear of the sleeve. These holes or

other non-perforated locations in the sides and/or top of

the sleeve may be used to fasten the sleeve to the wall

from the inside. Never secure the room cabinet/wall

sleeve to the wall through the bottom.

3b. Installations with an optional subbase. Adjust the

subbase leveling bolts such that the room cabinet/wall

sleeve is level or tilted a maximum of

⁄8" (3mm) down-

ward to the outside. Secure the room cabinet/wall sleeve

to the subbase with the two long screws retained from

the subbase assembly (see Figure 4). Holes,

⁄32" in

diameter, have been added to each side of the room

cabinet/wall sleeve as a provision for securing the sleeve

in the wall opening. Each hole is located 2" (51mm) down

from the top and 2" (51mm) in from the rear of the sleeve.

These holes or other non-perforated locations in the

sides and/or top of the sleeve may be used to fasten the

sleeve to the wall from the inside. Never secure the room

cabinet/wall sleeve to the wall through the bottom.

4. Caulk outdoor joint between conditioner and wall opening

around the top, bottom and both sides. Do not permit

caulking to block weep holes.

⁄8"

(86mm)

Leveling Bolt

4" (102mm)

Cabinet Sleeve

Finished

Wall

Louver

Depth

Louver

Frame

(Optional)

Outside

Wall

Secure Cabinet

Sleeve To

Subbase

Finished

Floor

⁄32" (4mm) Dia.

(Typical of 2)

Subbase

(Optional)

(51mm)

Figure 7.

Outside

Wall

Louver

Depth

Mortar Base

⁄32" (4mm) Dia.

(Typical of 2)

Subbase

(Optional)

Finished

Floor

4" (102mm)

Min. 9"

(229mm)

Finished Wall

Lintel By

Others

Figure 8.

(51mm)

Page 6 / IM 354

Louver Installation

pull it back to the wall sleeve rear face so that the louver studs

pass through the holes in the wall sleeve flanges. Securely

tighten the louver in place using the washers and nuts provided.

Install the outdoor louver from inside the room. Hold the louver

with a wire loop or other similar means. Push the louver out

through the rear opening of the room cabinet/wall sleeve and

Heating/Cooling Chassis Installation

Chassis Inspection & Installation Preparation

Check the chassis for damage. Remove and discard the

condenser fan shipping bracket (see Figure 9). Spin the fan

wheels manually to confirm free rotation. Check the refriger-

ant tubing to determine that there are no kinks, and that it

does not rub against other parts. Report any shipping dam-

age to the carrier immediately.

Check the interior of the installed room cabinet/wall box.

Clean out any dirt or debris that may have accumulated,

particularly abrasive materials that could scratch the painted

surfaces.

Optional Condensate Connection

If it has been decided to use the condensate drain, you will

need the optional kit containing one flexible drain connector

tube, one drain tube assembly and two #8 mounting screws.

1. Install the flexible tube on the chassis drain (see Figure 10).

2. Remove the front access cover of the subbase (see Figure

11).

3. Remove the knockout in the bottom left side of the wall

sleeve and mount the drain tube assembly with two

screws (see Figure 11). The assembly may be installed at

various 90 degree positions to fit job requirements.

4. Make the connection to the field supplied drain previously

installed under the subbase installation instructions. The

outlet of the drain tube assembly is

⁄2" nominal copper

tubing (

⁄8" O.D. actual). The easiest method of connection

would be with a short length of

⁄8" I.D. flexible PVC tubing

having a wall thickness of at least

⁄8" (3mm) to prevent

kinking or collapse, however, follow all local applicable

codes.

Heating/Cooling Chassis Installation

1. Slide the chassis into the room cabinet/wall sleeve until

firmly seated against the weather seals. Caution: Push

only on positions marked “Hand Holds” and/or sheet-

metal flanges. Caution: Do not push on the coil surface,

control box cover, or fan scroll (see Figure 13). Caution:

Make sure that tubing does not catch when inserting

chassis.

2. Plug the electrical cord into the receptacle. Excess cord

should be coiled neatly and stored in the conditioner.

3. If the optional condensate drain kit is used, install the

flexible tube between the chassis and wall sleeve conden-

sate drain by pressing the tube into the drain assembly

(see Figure 12). Caution: When removing the chassis,

remember first to lift the tube from the drain assembly.

4. Set the manual damper operator in open or closed posi-

tion as desired (see Figure 14).

5. Check the “Standby/Normal” switch located on the face

of the control box. For normal heat pump operation,

position the switch to “Normal.” Only the electric heater

will operate when switch is in “Standby’ position.

Residential and institutional cleaning compounds can

cause permanent damage to the packaged terminal unit.

To avoid damage to unit controls and heat transfer sur-

faces, do not spray cleaning compounds onto the dis-

charge grille, the return air opening or the unit controls.

Normal cleaning can be accomplished by wiping the unit

surface with a damp cloth. When using cleaning com-

pounds on carpets, floor or walls, turn the unit off to avoid

drawing potentially damaging vapors into the package

terminal unit.

Figure 12.

Figure 9.

Figure 11.

Figure 10.

Knockout

IM 354 / Page 7

Filter Access/Front Panel Operation

Figure 15. Figure 16.

Figure 13. Figure 14.

1. The filter assembly must be removed before removing the

front panel. The filter assembly may be removed by

grasping the lower black decorative rail and pulling out.

The filter is contained in this assembly and may be

removed for cleaning.

2. To remove the front panel, remove the two sheetmetal

screws adjacent to the release buttons in the top ends of

the black border area.

3. Release the top of the panel by depressing the two vertical

buttons in the top of the black border. When the condi-

tioner is new, some inward pressure on the buttons may

be required to effect release.

4. Tilt the panel out from the room cabinet and lift up to

disengage the hinging tabs in the lower corners from the

cabinet.

5. To install the front panel, insert the hinging tabs into the

slots in the bottom of the cabinet. Push the top of the front

panel closed, exerting sufficient pressure on the top black

border area to allow the latching buttons to snap into

place, usually with an audible click.

6. Replace the two sheetmetal screws adjacent to the latch-

ing buttons in the front panel.

7. Replace the filter assembly at the bottom of the front

panel.

Initial start-up of the Incremental conditioners by an experi-

enced technician is usually the responsibility of the installing

contractor. This consists of inspecting and operating the

equipment for all functions at time of initial installation, and

making necessary adjustments. It also includes demonstrat-

ing its proper operation to the owner or his agent. Note that

unless otherwise specifically agreed to in writing, McQuay

includes no field labor, start-up service or the like in the price

of its equipment. After the equipment leaves the factory, it

may become damaged or maladjusted during transportation

or on the job. Sometimes wires are disconnected acciden-

tally, or fan motors move on their bases due to rough

handling, causing fans to strike. The correction of such

conditions is part of the start-up.

Equipment Start-up

Before Starting Equipment Make Certain That:

1. The correct voltage has been supplied to the equipment.

2. The electrical plug from the control box has been inserted

into the receptacle.

During Start-up (Applies only to standard equipment)

1. Set the ventilation damper to the OPEN or CLOSED

position as required by the owner.

2. Push the HIGH button to select the fan speed; push the

HEAT button. Move the thermostat control to the extreme

heating position (counterclockwise). Heat should cycle on

and off as the thermostat requires. Push the LOW button;

the fan should change to the lower speed.

One-Year Warranty of Entire Conditioner— McQuay Inter-

national, hereinafter referred to as the “Company,” warrants

to the original owner that the entire Incremental Comfort

Conditioner is free from defects in material and workman-

ship. Any part or portion thereof which becomes defective

under normal use during the period of this warranty will be

repaired or replaced provided the Company’s examination

shall prove to its satisfaction that the part was or became

defective under normal use. This warranty contemplates that

first year maintenance labor was arranged for with the

installer or otherwise at the time the conditioner was pur-

chased or installed. The Company’s obligations under this

warranty are limited to: (a) Repairing the defective part or (b)

Furnishing a replacement part provided the defective part is

returned to the factory, transportation charges prepaid. No

reimbursement will be made for expenses incurred in making

field adjustments or replacements unless specifically autho-

rized in writing by the Company.

This warranty constitutes the buyer’s sole remedy. It

is given in lieu of all other warranties. There is no implied

warranty of merchantability or fitness for a particular

purpose. In no event and under no circumstance shall the

Company be liable for incidental or consequential dam-

ages, whether the theory be breach of this or any other

warranty, negligence, or strict tort.

No person (including any agent, salesman, dealer or

distributor) has authority to expand the Company’s obliga-

tion beyond the terms of this express warranty, or to state

that the performance of the product is other than that

published by the Company.

One Year Refrigeration Circuit Warranty — Hermetically

sealed motor-compressor assemblies and all components

of refrigeration circuits not readily separable therefrom are

warranted to the original owner for one year. Refrigerating

circuits consist of the motor-compressor assembly evapora-

tor coil, condenser coil and interconnecting tubing. Repairs

under this warranty will be made at the Company’s expense

provided that the refrigerating circuit is delivered without

shipping damage, transportation prepaid to the factory or to

a factory designated repair station, at the Company’s option.

This one-year warranty does not include any other parts of

the equipment such as filters, fans, fan motors, controls,

cabinet parts, electrical relays, capacitors, protective de-

vices, or wiring. The Company is not obligated under this

warranty for field labor such as service for inspection, remov-

ing, packing and/or reinstalling the refrigeration circuit, nor

for return transportation charges.

General Conditions — The above warranties are void if the

Company’s equipment has been damaged, misused, sub-

jected to abnormal use or service or its serial number has

been altered, defaced or removed, or payment for the equip-

ment is in default. The Company is not responsible for

service to correct conditions due to misapplication, im-

proper installation, inadequate wiring, incorrect voltage con-

ditions or unauthorized opening of the refrigeration circuit,

nor for consequential damages. In case the Company’s

equipment is installed in conjunction with cabinets, grilles,

louvers, controls or other parts manufactured by others,

these warranties shall apply only to the Company manufac-

tured portion of the equipment. The conditions of the war-

ranty plan are effective for eighteen (18) months from date of

factory shipment. The Company reserves the right to make

a handling and inspection charge in the case of parts or

equipment improperly returned as defective and/or as being

in warranty.

3. Push the HIGH button to select the fan speed; push the

COOL button. Move the thermostat control to the extreme

cooling position (clockwise). The compressor should cycle

on and off as the thermostat requires. Push the LOW

button; the fan should change to the lower speed.

4. Push the OFF or STBY button. The fan should stop and

neither the heater nor the compressor should continue to

operate.

Note: The direction of the conditioned air may be adjusted by

rotation of discharge grilles to change airflow pattern in a

room. The building superintendent or manager should be

requested to make any changes, as a thin flat-edged tool is

required to move grille.

Installation, Service & Warranty Policy

Printed on recycled paper containing at least 10% post-consumer recycled material.

13600 Industrial Park Blvd., P.O. Box 1551, Minneapolis, MN 55440 USA (612) 553-5330

McQuay Incremental MQT Series Installation And Maintenance Data

Brand: McQuay

Model: Incremental MQT Series

Category: Split-system air conditioners

Type: Installation And Maintenance Data

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McQuay Incremental MQT Series Installation And Maintenance Data

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