Carrier 40MKQB user guide manual

40MKCB**C/24AHA4 40MKCB**C/124ANS 40MKQB**C/25HHA4 40MKQB**C/224ANS Cassette Ductless Split Sizes 18 to 34

Installation Instructions

TABLE OF CONTENTS SAFETY CONSIDERATIONS 1 PARTS LIST 2 DIMENSIONS -- INDOOR 4 DIMENSIONS -- OUTDOOR 5 CLEARANCES -- INDOOR 7 CLEARANCES -- OUTDOOR 7 SYSTEM REQUIREMENTS 7 INSTALLATION 9 INSTALL INDOOR UNIT 9 INSTALL OUTDOOR UNIT 12 ELECTRICAL DATA 16 START--UP 20 TROUBLESHOOTING 23

Fig. 1 -- Indoor Unit, Outdoor Unit, and Remote Contro l

NOTE: Read the entire instruction manual before starting the installation.

WARNING

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could result in personal injury or equipment damage.

Puron refrigerant systems operate at higher pressures than standard R-- 22 systems. To avoid damage to the unit or possible personal injury, do not use R--22 service equipment or components on Puron refrigerant equipment.

SAFETY CONSIDERATIONS

Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory--authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazi ng operations . Have a fire extingui sher avai l able. Read these instruct ions thoroughly and follow all warnings or cautions included in the unit literature and on labels attached to the unit. Consult local building codes and current editions of the National Electrica l Code ( NEC ) NFP A 70. In Canada, refer to current editions of the Canadian electrical code CSA 22.1.

Recognize safet y information. This is the safety--alert symbol When you see this symbol on the unit and in instruct ions or manuals , be alert to the potential for personal injury. Underst and these signal words; DANGER, WARNING,andCAUTION. These words are used with the safety--alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor persona l injury or product and proper t y damage .

NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag switch with a suitable warning label.

CAUTION

ENVIRONMENTAL HAZARD

Failure to follow this caution may result in environmental pollution.

Remove and recycle all components or materials (i.e. oil, refrigerant, etc.) before unit final disposal.

PARTS LIST

Indoor Unit

Kit

TXV

The casse t t e type unit and horizontal discharge unit (24AHA/124ANS and 25HHA4/224ANS) install ation would not be complete without the addition of the TXV kit. This can be found in the packaging of the indoor unit. If you do not have this kit, order the kit and install the outdoor and indoor units when this is available.

Below are figures of the kit and how and where the kit is included within the indoor unit packaging.

Liquid pipe

Gas pipe

INSTALLATION

IMPORTANT: Effective January 1, 2015, all split systems and

packaged air conditioners must be installed pursuant to applicable regional efficiency standards issued by the Department of Energy.

CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts have sharp edges or burrs, Use care and wear appropriate protective clothing and gloves when handling parts.

CAUTION

PERSONAL INJURY AND EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in personal injury and / or equipment damage.

DO NOT operate the unit without a filter or with grille removed.

These instructions cover the installation and the start--up of the systems listed in Table 1.

Table 1 – Matched Systems

System

Type

Cooling

Only

Heat

Pump

Nominal Capacity KBTU/Hr

018 24AHA418A003 124ANS018000 40MKCB18C--3 024 24AHA424A003 124ANS024000 40MKCB34C--3 030 24AHA430A003 124ANS030000 40MKCB34C--3 034 24AHA436A003/5/6 124ANS036000 40MKCB34C--3 024 25HHA424A003 224ANS024000 40MKQB34C--3 030 25HHA430A003 224ANS030000 40MKQB34C--3 034 25HHA436A003/5/6 224ANS036000 40MKQB34C--3

Outdoor Unit Indoor Unit

Refrigerant flow direction

Fig. 2 -- TXV Kit

Flexible pipings

(Field)

Flexible pipings

(Field)

TXV Kit

Fig. 3 -- TXV Kit (within packaging of indoor unit)

A150289

A150286

Table 2 – Indoor Units Parts List

Name o f Part

Qty. Usage

Owner’s Manual 1 Guide for the homeowner Warranty card 1 Warranty information Installation instructions 1 Guide to install the unit

Pipe insulation Material 1

Insulation for refrigerant piping

For conforming to EMC

Clamp filter 2

standards on connecting wires

Flexible hose 1

Pipe clamp 1

Drains moisture from inside the indoor unit

Fixes the flexible hose to the indoor unit

Remote Controller 1 Controls the indoor unit

Remote Controller holder 1

Tapped Screw 2

Holds the remote controller on the wall Used to fix the remote controller holder

Battery 2 Powers the remote controller

Strain relief bracket 1

To affix strain relief to hold wires in place

Screws 4 To affix strain relief bracket

Cassette Cover Panel

A cassette grille/panel is required to complete installation of indoor unit. The indoor unit installa t ion would not be compl ete without the addition of this grille. Order it and complete installation when you have the grille available. The grille model number is: 40MK--B01C----3.

Outdoor Unit

The following items are included with the outdoor unit:

Fig. 5 -- 24AHA/124ANS

Fig. 6 -- 25HHA4/224ANS

Table 3 – Outdoor Unit Parts Checklist

Model

24AHA4/124ANS n 25HHA4/224ANS n n n n

Filter Drier

Piston

Cap

Pistons

A09536

A09537

Flare

Connector

Fig. 4 -- Cassette Grille/Panel

DIMENSIONS - INDOOR

Cassette Grille

Cassette Body

Drain pipe connector

Refrigerant pipe connector

Fresh air intake (

Φ75mm)

Fig. 7 -- 40MKC**C, 40MKQ**C Unit and Panel Dimensions

Table 4 – Dimensions Indoor

Indoor Unit Size

BTU/Hr

18K 33.1 (840) 33.1 (840) 8.1 (205) 54.0 (24.5)

24K – 34K 33.1 (840) 33.1 (840) 11.3 (287) 68.6 (31.1)

Cassette Panel 37.4 (950) 37.4 (950) 2.2 (55) 11.0 (5)

Height (H)

in (mm)

Width (W)

in (mm)

Depth (D)

in (mm)

Operating Weight

lb (kg)

A150291

DIMENSIONS -- OUTDOOR

NOTE:

S Center of Gravity S All dimensions are in “inches” unless noted.

MINIMUM

UNIT SIZE

18,24 23” x 42”

30,36 24” x 50”

MOUNTING PAD

DIMENSIONS

Fig. 8 -- Outdoor Unit Dimensions

227

103.0

89.4

197

22.2

Table6–Dimensions(ACs)

Table7–DimensionsSI(ACs)

Table 8 – Dimensions (HPs)

Table9–DimensionsSI(HPs)

XX0

6 X

124ANS024000/

12ANS030000/

124ANS018000 /

124ANS036000/

124ANS018000

124ANS036000

124ANS024000

124ANS030000

224ANS024000/

224ANS030000/

224ANS036000/24HHAA436 0 X XX

224ANS024000/

224ANS030000/

224ANS036000/

CLEARANCES -- INDOOR

Fig. 9 -- 40MKC**B, 40MKQ**B Unit Clearance

A150152

CLEARANCES -- OUTDOOR

1. Single Unit Applications: With coil facing wall: Allow 6” (152.4mm) minimum clearance on coil side and coil end and 20” (504.0 mm) minim um clearance on fan side. Allow 24” (609.6 mm) minimum clearance on compressor end for service.

2. With fan facing wall: Allow 8” (203.2 mm) minimum clearance on fan side and coil end and 20” (504.0 mm) minimum clear ance on coil side. Allow 24” (609.6 mm) minimum clearance on compressor end for service when units are stacked or there is less than 40” (1016 mm) of clea rance above the unit. If there is 40” (1016 mm) clearanc e above unit and the top panel is accessible for removal allow 8” (203.2 mm) minimum clearance on compressor end for service.

3. Multi--unit Applications: Allow 24” (609.6 mm) minimum clearance between fan and coil sides of multiple units. Arrange units so discharge of one does not enter inlet of another. Allow 24” (609.6 mm) minimum clea rance on compressor end when units are stacke d or ther e is less than 40” (1016 mm) of clearance above the unit. If there is 40” (1016 mm) clearance above unit and the top panel is accessible for removal allow 8” (203.2 mm) minimum clearance on compressor end for service. When two units are installed end to end with the coil ends facing each other allow 12” (304.8 mm) minimum clearance between units.

IMPORTANT: When installing multiple units, ensure the discharge air from one unit is not drawn into another unit. When installing single or multiple units in an alcove, roof well, or partially enclosed area, ensure there is adequate ventilation to prevent recirculation of discharge air.

SYSTEM REQUIREMENTS

Clearances

Allow sufficient space around the indoor and outdoor unit for proper airflow circulation and servicing. Refer to Fig.9 and the outdoor unit clearance section for minimum required clearances.

Piping: Piping and insulation is field supplied.

Piping Lengths

The minimum length between the indoor and outdoor units is 10 ft (3 m). Refer to table 9 for the maximum lengths allowed.

Table 9 – Maximum Refrigerant Line Lengths

Unit Size

18K-34K 250 (76.2) 65 (19.8) 200 (61)

Note:Forlengthsgreaterthan25ft(7.6m),refertotheResidential Long Line Guide.

Max Line

Length* ft(m

Max Elevation

(ID over OD)

ft(m)

Pipe Sizes

In some models, indoor unit and/or outdoor unit pipe sizes may differ from those in TXV connections. Coupling is required in those cases. See Table 10 for complete list of tube sizes to identify coupling needs.

Table10–PipeSizes

Indoor Unit Tube

Indoor Unit Outdoor Unit

40MKCB18C-- -- 3

40MKCB34C-- -- 3

40MKQB34C-- --3

Note:Both line s need to be insulated using at least 1/2 inch closed foam insulation.

24AHA418

124ANS018

24AHA424

124ANS024

24AHA430

124ANS030

24AHA436

124ANS036

25HHA424

224ANS024

25HHA430

224ANS030

25HHA436

224ANS036

Sizes (in)

Liquid Vap o r Liquid Va po r Liquid Vap o r

3/8

TXV Kit Tube

Sizes (in)

5/8

3/4 3/4 3/4

3/4 3/4 7/8

3/4 3/4 3/4

3/4 3/4 7/8

5/8

3/8

Max Elevation (OD overID)ft(m)

Outdoor Unit Tube Size (in)

5/8

3/8

Condensate Drain Pipe Sizes

Refer to table 11 for the required sizes.

Table 11 – Drain Pipe Sizes

Indoor Unit Size

BTU/Hr

18K 1 (25.4)

24K – 34K 1 (25.4)

Outside Diameter

in (mm)

Refrigerant Charge

The outdoor units can be matched with multiple indoor units and thus a different amount of charge might be required when matched with the 40MKCB**C or 40MKQB**C units. Charge to Sub--cooling Delta from Rating Plate Value as stated below.

Table 12 – Charge Requirements

System

Type

Cooling

Only

Heat

Pump

Nominal Capacity

kBTU/Hr

018 24AHA418A003 124ANS018000 40MKCB18C-- --3 12

024 24AHA424A003 124ANS024000 40MKCB34C-- --3 12

030 24AHA430A003 124ANS030000 40MKCB34C-- --3 12

034 24AHA436A003/5/6 124ANS036000 40MKCB34C----3 8

024 25HHA424A003 224ANS024000 40MKCB34C-- --3 14

030 25HHA430A003 224ANS030000 40MKCB34C-- --3 11

034 25HHA436A003/5/6 224ANS036000 40MKCB34C----3 14

Outdoor Unit Indoor Unit

Charge to

Sub--cooling Delta

from Rating Plate

Val u e

NOTE: The above additional charge is required amount for line lengths up to 25 ft. (7.6 m). For line lengths exceeding 25 ft (7.6 m), additional charge will be required. Refer to the Residential Long Line Guide.

Metering Device

The 40MKC(Q)*C unit uses a TXV while the outdoor unit uses a type B accurator. The cooling metering device is installed with the indoor unit. The heating metering device is installed with the outdoor unit. One metering device is required for the cooling only system and two are required for the heat pump systems. Refer to Table 13 for a breakdown of each unit’s metering devices.

Table 13 – Metering Devices

System Size

kBTU/hr

018 TXV - 024 TXV TXV 0.049" 030 TXV TXV 0.055" 034 TXV TXV 0.063"

Cooling Only Heat Pumps

40MKCB**C 40MKQB**C 25HHA4/224ANS

Power and Connecting Cables -- Field Supplied

Recommended Connection Method for Power and Communication Wiring (To minimize communication wiring interference)

Power W

The main power is supplied to both the indoor and the outdoor units. The field supplied connecting cable consists of three (3) wires. Two wires are high voltage AC power and one is a ground wire. Consult your local building codes and the NEC (National Electrical Code) or CEC (Canadian Electrical Code) for special requirements. All wires must be sized per NEC or CEC and local codes. Use Electrical Data table MCA (minimum circuit amps) and MOCP (maximum over current protection) to correctly size the wires and the disconnect fuse or breakers respectively. Per caution note, only copper conductors with a minimum 300 volt rating and 2/64--inch thick insulation must be used.

iring:

Communication Wiring:

A separate shielded Stranded copper conductor only, with a 600 volt rating and double insulated copper wire, must be used as the communication wire from the outdoor unit to the indoor unit. To minimize voltage drop of the communication wire, use the wire size and maximum lengths shown in Table 14.

Table 14 – Maximum Lengths

Wire Size Length ft. (m)

18AWG 50 ft. (15 m) 16AWG 50 ft. (15 m) to 100 ft. (30 m) 13AWG 100 ft. (30 m) to 200 ft. (60 m)

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow the following caution may result in equipment damage or improper operation.

Wires should be sized based on NEC and local codes. Use copper conductors only with a 600 volt rating and double insulated copper wire.

User Interface

The indoor unit is supplied with a wireless remote control to operate the unit (an Owner’s Manual is supplied with the unit). The following accessories are available.

S Wall mounted control.

Operating Range

Ensure that the system operates within the application guidelines shown in the following tables.

Table 15 – Cooling Operating Range

Maximum Minimum

Outdoor

Unit

Indoor Unit 90 (32) - 64 (18) -

DB °F (° C) WB °F (°C) DB °F (°C) WB °F (°C)

125 (51.7) - 55 (12.8) -

Table 16 – Heating Operating Range

Maximum Minimum

Outdoor

Unit

Indoor Unit 80(27) 32 (0) -

DB °F (° C) WB °F (°C) DB °F (°C) WB °F (°C)

75 (23.9) 67 (19.4) 17 (-8.3) -

Accessories

An extensive list of field installed accessories is available for both indoor and outdoor units. Identify what accessories, if any, are required for the application at hand and consult the separate installation instructions for the accessories. Some of the accessories, especially on the indoor units, can be installed much easier if planned ahead.

INSTALLATION

Complete Pre--installation Checks

1. Unpack Unit -- Store the indoor and outdoor units in the original packaging until it is moved to the final site for installa tion. When unpacking indoor unit, be careful not to lift unit by condensate drain discharge pipe or by refrigerant connections.

2. Inspec t Shipment -- Upon receipt of shipment, check the indoor and outdoor units for damage. If there is any damage, forwa r d claim papers direct ly to the transportati on company. Manufa cturer is not responsi ble for damage incurred in transit.

3. Inspect Parts Supplied With Units – Check all items against parts list (see the PARTS LIST section). If any items are missing, notify your distributor or manufacturer office. To prevent loss or damage, leave all parts in original packages until installation.

Consider System Requirements

1. Consult local building codes and NEC for special installation requirements.

2. When deciding the location of the indoor and outdoor units, ensure that the piping run does not exceed the allowed distances listed in Table 9.

3. Make sure the indoor and outdoor units are easily accessible to electrical power.

4. Allow sufficient clearances for airflow, wiring, refrigerant piping, and servicing the unit (see the ”CLEARANCES -INDOOR” and “CLEARANCES -- OUTDOOR” sections).

5. Condensate piping can be directed through the inside wall to an approved drain or straight outside.

INSTALL INDOOR UNIT

Plan the installation carefully before you begin.

1. Select indoor unit location.

a. Where it is out of direct sunlight.

b. Where the airflow is not blocked.

c. Where an optimum air distribution is ensured.

d. Where the condensate can drain correctly and safely.

e. A ceiling that prevents vibration and is strong enough to

hold the product weight.

f. Maintain sufficient clearance around the indoor unit for

maintenance and servicing. Refer to the clearances section of this document.

g. Where the air filter can be removed and cleaned easily. h. Where the piping between the indoor and outdoor units

is within the allowable limits.

i. Inst all the indoor unit 1m or more away from the TV or

radio to prevent the screen from being distor ted or noise from being generated.

j. Install the indoor unit as far away as possible from

fluorescent and incandescent lights so that the remote control can be operated well.

k. Do not install units too close to humid conditions.

2. TXV Installation

a. Location -- The TXV kit can be affixed directly to the

indoor unit or anywhere between 12 to 18 inches from the indoor unit pipe connection.

Failure to follow the following caution may result in equipment damage or improper operation.

The TXV kit needs to be installation at most 12 to 18 inches from the indoor unit pipe connection.

b. The TXV contains a label specifying the allowed flow

direction. See below for allowed and not allowed flow directions.

Failure to follow the following caution may result in equipment damage or improper operation. One of the two arrows on the TXV part number label must point up when installed. Install unit such that the refrigerant flow directions is in any of the two allowed directions.

Indoor unit connection

Arrows on TXV label pointing

upward and to the right

Fig. 10 -- Allowed TXV installation direction per label at-

indoor

unit

CAUTION

Outdoor unit connection

Arrows on TXV label pointing

upward and to the left

tached to TXV

Refrigerant flow direction

Indoor unit connection

outdoor

unit

Fig. 11 -- TXV Flow Direction

indoor

unit

Refrigerant Flow Direction

unit

outdoor

Liquid pipe

outdoor

unit

Gas pipe

c. Once location and flow direction is identified, connect

piping between indoor unit and TXV kit. Flexible piping is recommended.

CAUTION

Failure to follow the following caution may result in equipment damage or improper operation. Insulate liquid and vapor pipes connecting to indoor and outdoor units.

Liquid pipe

unit

indoor

Gas pipe

Refrigerant flow direction

Piping connection ports

(Gas side and liquid side)

Flexible pipings

(Field supplied)

Refrigerant flow

Flexible pipings (Field supplied)

Direction

TXV Kit

Fig. 14 -- TXV Attached to Cassette Body

Flexible pipings (Field supplied)

maximum length

TXV Kit

allowed: 12 - 18 in

Piping connection ports

(Gas side and liquid side)

Connection to

outdoor unit

Fig. 15 -- TXV Kit not Attached to Cassette Body

interconnection pipings

TXV Kit

Connect to

A150294

Fig. 12 -- Allowed Refrigerant Flow Direction

Refrigerant Flow Direction

Fig. 13 -- Refrigerant Flow Direction Not Allowed

3. Install Suspension Bolts a. Mark the spots on the ceiling where you want to install

the indoor unit.

b. Drill holes at the marking spots and then insert bolt

anchors. Use existing ceiling supports or construct a suitable support. Use a hole--in-- anchor, sunken insert for existing ceilings.

c. Depending on the type of ceiling, fix the threaded

hangers as shown in Fig. 16 and Fig. 17.

d. Insert the washers as shown in Fig. 16 and Fig. 17.

e. Remove the “T” bar in ceiling to facilitate installation.

See Fig. 17. If the “T” bar cannot be removed from the ceiling, the unit may have to be tilted as shown in Fig.

18.

d. Screw the nuts to suspend the unit. Check the lower side

of indoor unit locates at position (10 to 12 mm) higher than the lower surface of the ceiling. L is about half of the screw length of the installation hook.

e. Adjust level of the unit by using level vial to make sure

the horizontal level of the main body is within

1°.

Nut Washers Threaded hangers Wooden frame Nut

Fig. 16 -- Attach Hangers to Ceiling

Fig. 17 -- Threaded Hangers and “T”Bar

Threaded Hangers

T-Bar

Supension Brackets

Threaded Hangers

T-Bar

Supension Brackets

Fig. 18 -- Positioning Unit in Ceiling

4. Hanging the Indoor Unit:

a. Screw double nuts to each suspension bolts making

space for hanging the indoor unit

b. Use a stacker to lift the unit to the installation site.

Washe r Threaded hangers Washe r Nut Nut

A07186

Threaded hangers

"T" bar (to be removed)

A07187

T-Bar

A07188

2.3.2 Hang the indoor unit to the suspension bolts between two nuts.

~12 0 1

Body

Shockproof cushion

Washe r Hanging screw bolt

Screw nut

Overhang part

Ceiling

Fig. 20 -- Suspension Bolt Details

5. Install the Drain Pipe

The cassette unit is equipped with a condensate pump. Use the following steps to install the drain piping.

a. Remove the cover of the drain hose connection port.

b. Insert the flexible hose onto the drain hose port.

Securely fix the flexible hose to the indoor unit with a pipe clamp.

c. Install the flexible hose onto the PVC water pipe (field

supplied, O.D. 1”) with PVC adhesive.

NOTES: The drain pipe should be install within 200mm from the flexible hose connection at the indoor unit. To ensure correct condensate water flow, the pipe should have a gradient of 2% without obstruction. see figure 21.

d. Make a trap of at least 2 in. (51 mm) in depth to prevent

unpleasant odors from reaching the room.

e. Insulate condensate pipe with condensation proof

material such as polyurethane, propylene, or neoprene of 3/16 in. to 3/8 in. thickness.

Indoor unit

Drain hose connection port

Pipe clamp

Flexible hose

PVC water pipe

PVC adhesive

O.D.:Φ25)

Fig. 19 -- Positioning Unit

c. Hang the indoor unit to the suspension bolts between

two nuts.

A07185

<200mm

1.0-1.5m

Drain hose connection port

Lean over 2%

Max. 750mm

A150296

Fig. 21 -- Drain Pipe Connection

f. Drill a 2--3/4 in. (70 mm) hole in the wall with a 3/16

in. to 3/8 in. (4.8 -- 9.5 mm) slope toward the outside (see Fig. 22). This hole will be used for the piping (refrigerant and condensate) and control wiring

m 0 " 4/3-

8/0 2

(

Indoor

3/16" (5

10 m

f. Hang the hook behind the air inlet grille on to the panel.

g. Connect the display connector to the corresponding

plug on the main body (see Fig. 25).

Outdoor

3/8"

h. Close the air inlet grille.

i. Press the installation cover gently into the panel.

Fig. 22 -- Drilling for Connections

6. Install the panel: a. Push the two grille switches simultaneously, then lift the

grille up and remove the air inlet grille. Take out the covers from the 4 corners (see Fig. 23).

Grille switch

Fig. 23 -- Inlet Grille Removal

b. Align the corner marked with the piping and drain side

with the piping and drainage interfaces of the main body.

c. Hang the panel to the hooks on the main body.

d. Tighten the screw evenly under the panel hook until the

thickness of the sponge between the main body and panel is reduced to about 4~6mm. The edge of the panel should contact the ceiling well.

e. Connect the swing motor connector to the

corresponding plug on the main body.

Installation cover’s rope

Tap Screw

Slide the four sliders in the corresponding

channel when installing

the cover

Fig. 25 -- Display Wire Connection

INSTALL OUTDOOR UNIT

The outdoor units can be installed on the ground, on the roof, or mounted on a wall.

NOTE: Install the unit so that the coil does not face into prevailing winds. If this is not possible and constant winds above 25 mph are expected, use the accessory wind baffle. See the installation instructions provided with the accessory kit. Wind baffles should also be used on all units with accessory low ambient temperature control.

Mounting on Ground

1. Mount unit on a solid level concrete pad.

2. If a heat pump is being installed, use a field-- provided snow stand or ice rack where prolonged subfreezing temperatures or heavy snow occurs.

3. Position unit so water or ice from roof does not fall directly onto unit.

4. On cooling only units, an accessory stacking kit can be used when units are to be stacked. See installation instructions provided with the accessory kit.

Mounting on Roof

IMPORTANT: Mount unit on a level platform or frame at least 6

in. (152.4 mm) above roof surface. Isolate unit and tubing from structure.

Piping port

Drain port

Screw

Cross-screwdriver

Hook panel

Fig. 24 -- Installing the Cassette Panel

CAUTION

PERSONAL INJURY AND/OR EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in personal injury and/or equipment damage. Be sure unit panels are securely in place prior to rigging.

1. Rig the unit. Keep the unit upright and lift u sing a sling. Use cardboard or padding under the sling, and spreader bars to prevent sling damage to the unit. See Fig. 26 for center of gravity reference

2. Mount unit on a solid concrete pad or platform.

3. Isolate unit and piping from structure

4. If a heat pump is being installed, use a field-- provided snow stand or ice rack where prolonged subfreezing temperatures or heavy snow occurs.

5. On cooling only units, an accessory stacking kit can be used when units are to be stacked. See installation instructions provided with accessory kit.

Connection at Outdoor Unit

A07396

Fig. 26 -- Lifting Unit with Sling

Mounting Unit on Wall

The units can also be mounted on the wall using the accessory mounting kit.

Complete Outdoor Refrigerant Connections

Follow the following general guidelines:

1. Use refrigerant grade field – supplied tubing. Refer to Table 10 for the correct line sizes.

2. Do not use less than 10 ft (93.05 m) of interconnecting tubing.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

To prevent damage to unit or service valves observe the following:

S A brazing shield MUST be used. S Wrap service valves with wet cloth or use a heat sink

material.

24AHA4/124ANS Units:

1. Assemble the connector tube to the factory supplied filter drier by:

a. Braze the field supplied connector to the inlet of the

filter drier (see Fig. 27).

Fig. 27 -- Cooling Only Connector Tube Assembly

CAUTION

A09536

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

If any section of pipe is buried, there must be a 6 in. (152.4 mm) vertical rise to the valve connections on the outdoor unit. If more than the recommended length is buried, refrigerant may migrate to cooler, buried section during extended periods of system shutdown. This causes refrigerant slugging and could possibly damage the compressor at start--up.

When more than 80 ft (24.4 m) of interconnecting tubing is used, consult the Residential Long Line Application Guide for required accessories.

3. Insulate both lines. A minimum of 1/2 inch foam pipe insulation is recommended.

4. Run the refrigerant tubes as directly as possible and avoid unnecessary turns and bends.

5. Suspend refrigerant tubes to avoid damage to insulation or tubes so they do not transmit vibration to the structure.

6. When passing refrigerant tubes through the wall, seal the opening so rain and insects do not enter the structure. Leave some slack in refrigerant tubes between structure and outdoor unit to absorb vibration.

2. Braze the completed filter drier assembly to the liquid service valve.

3. Connect the field supplied line set to the filter drier assembly and the suction valve. A sweat connection is required at the suction valve and flare connection is required for the mixed phase line.

4. Insulate any exposed areas between the line set and the liquid valve.

25HHA4/224ANS Units

1. Assemble the connector tubes to the factory supplied filter drier by brazing the factory supplied flare connectors to the inlet and outlet for the filter drier (see Fig. 28).

A09537

Fig. 28 -- Heat Pump Connector Tube Assembly

2. Remove the plastic cap from the liquid and sucti on service valve on the heat pump outdoor unit and assemble the heating piston and piston cap supplied with the outdoor unit as shown in Fig. 29.

A07407

Fig. 29 -- Accurator (bypass type)

Metering Device Components

NOTE: The Tefl on seal on the piston should point towards the liquid service valve. The size of the factory supplied piston might have to be adjusted for long line applicat i ons (over 80 ft /24.4 m). Refer to the Reside ntial Long Line Appli c at ion Guide for additional information.

3. Attach the flare end of the filter drier assembly to the piston cap (see Fig. 28).

4. Connect the field supplied line set to the filter drier assemblyandtothesuctionvalve.

5. Insulate any exposed areas between filter drier and liquid valve.

Complete Outdoor Power and Control Wiring

Failure to follow this warning could result in personal injury or death.

The unit cabine t must have an uninterr upted or unbroken ground to minimize personal injury if an elec t rica l fault should occur. The ground may consist of ele ctri cal wire or metal conduit when installed in accordance with existing electrical codes.

WARNING

Power Wiring

NOTE: The indoor and outdoor units are powered separately.

1. Mount indoor and outdoor power disconnect . The units are factory wired for the voltage shown on the unit nameplate s. The fused disconnect switc h must be provided within sight of the unit, readily accessible, but out of reach of children. Provisions for locking the disconnect switch on the OFF (open) position is advisable. The disconnect switch must comply with NEC and local codes. Protec t the unit and wiring using only the recommended fuse/circuit breaker size (see T ables 17 thru 20).

2. Run power wiring from electric panel to disconnect per NEC and local codes.

3. Run power wiring from the disconnect switc h to indoor and outdoor units. Use only minimum 75_C copper conduct ors betwe en the disconne ct switch and the unit for field power connection.

4. Route the field power wires through the conduit connection opening in the unit side panel and connect in junction box as shown in Fig 30 for outdoor units and the strain relief bracket section for indoor units. The units and power wiring must be grounded.

SINGLE-PHASE CONN TO DISCONNECT PER NEC

THREE-PHASE CONN TO DISCONNECT PER NEC

LEGEND NEC -- National Electrical Code

-- Splice (field) Field Wiring Factory Wiring

GROUND LEAD

Fig. 30 -- Line Power Connections

GROUNDING LUG

BLK

SINGLE-PHASE UNIT

BLK

BLU

YEL

GROUNDING LUG

THREE-PHASE UNIT

A08251

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

Unit failure as a result of operation on improper line voltage or excessive phase imbalance constitutes abuse and may cause damage to electrical components. Such operation could void any applicable manufacturer warranty.

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

Before performing service or maintenance, be sure indoor unit main power switch is turned OFF and indoor blower has stopped.

Lock out and tag switch with a suitable warning label.

NOTE: Operating unit on improper line voltage constitutes abuse and may affect the manufacturer’s warranty. DO NOT install unit in a system where voltage may fluctuate above or below permissible limits.

Control Wiring

Thermostat wires should be used for control wiring between the indoor and outdoor units. A two conductor cable is required for the cooling only units and a four conductor cable is required for heat pumps. 18 AWG is recommended for lengths up to 50 ft. (15 m.), and 16 AWG is recommended between lengths of 50 ft. (15 m.) to 100 ft. (30 m.).

The control circuit is 24 volts AC (minimum 40VA) supplied from the indoor unit.

1. Make sure you have enough control wires to cover the distance between the indoor and outdoor unit.

2. Route one end of the control wiring through the opening provided in the unit side panel and connect to the control terminal strip using either Fig. 31 for AC units or Fig. 32 for Heat Pump Units.

A150280

Fig. 31 -- 40MKCB**C/24AHA4 or 124ANS Connecting

Diagram

Strain Relief Bracket for Indoor Units

A strain relief is included within the indoor unit’s packaging. This is required to be installed. The strain relief bracket and location to where this should be affixed on the unit’s body is shown in Fig 33 and 34.

A150303

Fig. 33 -- Strain Relief Bracket

A150282

Fig. 32 -- 40MKQB**C/25HHA4 or 224ANS Connecting

Diagram

A150304

Fig. 34 -- Strain Relief Bracket Affixed to Cassette Body

ELECTRICAL DATA

Table 17 – 24AHA4/124ANS Electrical Data

Unit Size --

voltage series

18--30 24--30 62.9 10.9 0.50 14.1 25 30--30 73.0 14.1 0.70 18.3 30 36--30 77.0 14.1 1.20 18.8 30 36--50 208/230/1 253 197 71.0 9.0 1.20 12.5 20 36--60 460/3 506 414 38.0 5.6 0.60 7.6 15

Unit Size

Voltage Series

24--30 30--30 64.0 12.8 1.20 17.2 30 36--30 77.0 14.2 1.20 19.0 30 36--50 208/230/3 253 197 71.0 9.3 1.20 12.8 20 36--60 460/3 506 414 38.0 5.6 0.60 7.6 15

Indoor Unit Size

BTU/Hr

18K 208–230 -- 1 -- 60 187 253 0.332 1 15

24K – 34K 208–230 -- 1 -- 60 187 253 0.8 1 15

V/PH

208/230/1 253 197

V/PH

208/230/1 253 197

V--Ph--Hz

OPER VOLTS* COMPR FAN

MAX MIN LRA RLA FLA

56.3 9.0 0.50 11.8 20

Table 18 – 25HHA4/224ANS Electrical Data

OPER VOLTS COMP FAN

MAX MIN LRA RLA FLA

58.3 12.8 0.50 16.5 25

Table 19 – 40MKCB**C Electrical Data

Voltage Range Fan Power

Min (V) Max (V) FLA (A) MinCktAmp(A)

MCA

Max Fuse CB Amp

MAX FUSE**

or CKT BRK

AMPS

MAX FUSE**

or CKT BRK

AMPS

(A)

Table 20 – 40MKQB**C Electrical Data

Indoor Unit Size

BTU/Hr

24K – 34K 208–230 -- 1 -- 60 187 253 0.8 1 15

LEGEND FLA --- F u l l L o a d A m p s H A C R --- Heating, Air Conditioning, Refrigeration L R A --- Locked Ro tor A mps N E C --- National Electrical Code RLA---RatedLoadAmps(compressor)

*Permissible limits of the voltage range at which the unit will operate satisfactorily **T i m e --- D e l a y f u s e . Complies with 2007 requirements of ASHRAE Standards 90.1

V--Ph--Hz

Voltage Range Fan Power

Min (V) Max (V) FLA (A) Min Ckt Amp (A)

Max Fuse CB Amp

(A)

FAN

0~15

32~47

16~31

48~63

JR6

To CC M Comm.Bus

JR6

CN 23

Legend:

................Model sp ecic fe ature

Live wire L1/Null line L2

CN 1:

Null line C

CN 17: CN111 :Comp ressor si gnal CN 8: Fa n CN 6: Co nnectors CN 33: R emote a larm inte rface CN 23: R emote sw itch interface CN 13: P ump interface CN 14: S wing motor inter face CN 5: Wa ter level switch in terface CN 10: D isplay bo ard inter face CN 3: Ce ntralized control system Interface P 1 :Mag netism li nk interfa ce CN 15: M otor interface

Ma gnetism link

T1: Room tempera ture sen sor T2: Pipe tempera ture sen sor XT1:3 po le termin al block XT 2: 5 p ole term inal block

Notes:

1.To be wire d in acc ordance with Na tional Electric N.E.C. and lo cal code s.

2.Use C opper c onductors only. Use con ductors suitable for at le ast 75*C (167*F) .

3. If any of the o riginal wires, as supplie d must be replace d, use t he sam e or equ ivalent w ire.

Fig. 35 -- 40MKCB**C wiring diagram

OUTDOOR UNIT SCHEMATIC DIAGRAM

interface

Fig. 36 -- 24AHA4/124ANS Wiring Diagram

FAN

0~15

32~47

16~31

48~63

JR6

To CC M Comm.Bus

JR6

CN 23

Legend:

................Model sp ecic fea ture

CN 1:

Live wire L1/Null l ine L2

CN 17:

Controls 24V sign al interfac e(R/C)

CN111 :

Signal in terface(Y /O) CN 8:New fan CN 6: Co nnectors CN 33: R emote ala rm interfa ce CN 23: R emote sw itch interface CN 13: P ump interface CN 14: S wing motor interfa ce CN 5: Wa ter level s witch interface CN 10: D isplay bo ard interf ace CN 3: Ce ntralized control sy stem Inte rface P 1 :Magn etism link interface CN 15: M otor interface

Ma gnetism link

T1: Room tempera ture sens or T2: Pipe temperature senso r XT1:3 po le termina l block XT2:5 po le termin al block

interface

Notes:

1.To be wired in accor dance w ith National Electric N.E.C. and loca l codes.

2.Use C opper co nductors only. Use con ductors suitable for at lea st 75*C( 167*F).

3. If any of the o riginal wires, as supplied must be replace d, use th e same or equiv alent wire.

Fig. 37 -- 40MKQB**C wiring diagram

OUTDOOR UNIT SCHEMATIC DIAGRAM

Fig. 38 -- 25HHA4/224ANS Wiring Diagram

Run Power Wiring for Indoor Unit

Be sure field wiring complies with local building codes and NEC, and unit voltage is within limits shown in Tables 17 through 20.

Contact the local power company for correction of improper line voltage.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death.

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

NOTE: Use copper wire only between disconnect switch(es) and unit.

NOTE: Install a branch circuit disconnect of adequate size to handle the unit starting current per NEC. Locate the disconnect within sight of, and readily accessible to the unit, per section 440--14 of NEC. Some codes allow the indoor unit to share a disconnect with the outdoor unit if the disconnect can be locked; check local codes before installing in this manner.

The 40MKCB**C and 40MKQB**C units require their own power supply.

1. Locate the indoor power supply.

2. Locate and install disconnect switch per NEC and local codes.

3. Run power supply wiring to disconnect switch.

4. Run power wiring from disconnect switch to the cassette control box. Use copper wire only.

5. If any accessories are being installed, refer to the individual accessory instructions for guidance on wire routing at this time.

WARNING

CAUTION

Install All Power, Interconnecting Wiring, Piping and Drain Hose to Indoor

1. Run the control wiring from the outdoor unit through the access hole in the wall and make sure you have enough wire to reach the control box of the unit once hung from the suspension bolts.

2. Complete all refrigerant piping connections.

a. Cut the extreme end of the tubes and remove any

copper shavings with a deburring blade.

b. Remove the flare nut from the “Flare” connection body

of the indoor unit and insert them into the pipes.

c. Make the flares to the pipe ends with the proper flaring

tool. The flare end must not have any burrs or imperfections. The flared walls must be uniform (see Fig. 39 and Fig. 40).

Unit

Fig. 39 -- Removing Burrs

Fig. 40 -- Flared Walls as Equal

3. It is recommended that flare connections be located on the outside of the wall where the indoor unit is to be mounted. If an extension pipe is required to facilitate this location, measure, fabricat e and install the extension pipes to the indoor unit before hanging the unit.

4. If piping connections are on the outside wall, pass the pipes (refrigerant and drain) through the wall sleeve. Support the unit away from the bottom using a tool or a piece of wood.

Fig. 41 -- Location of Piping, Hose, and Wiring

5. Route the power and control wiring through the back side of the unit and to the control box area. If the wired remote is to be used, perform any modifications required at this time. Refer to the Accessory installation instructions.

A01799

A07200

A08364

6. Remove the control box cover and finish all indoor unit

wiring connections as shown on the wiring diagram or in the accessory installation instructions. Replace the control box cover.

7. Lubricate the end of the pipe and thread of the flare connection with refrigerant oil. Tighten by hand and then use two wrenches (see Fig. 42) to tighten all connections.

Adjustable wrench or torque wrench Outdoor end Indoor end

8. Disconnect charge hose from charge connection of the low side service valve.

9. Fully open service valves B and A.

10. Securely tighten caps of service valves.

Outdoor Unit

Service Valve

Refrigerant

Low Side

High Side

Fig. 43 -- Service Valve

Indoor Uni

A07360

Manifold Gage

Fig. 42 -- Tightening Connections

START--UP

Preliminary Checks

1. Check condensate drainage system; on the opposite side of the drain connection, insert a water bottle up into the fan coil unit and fill the drain pan. Water must flow steadily; if not, check the pipe slope or inspect for any pipe restrictions.

2. Make sure all wiring connections are correct and they are tight.

3. Field electrical power source must agree with unit name plate rating.

4. Check that all barriers, covers, and panels are in place. Ensure that the filters and return --air grilles on the indoor unit have been installed and that the discharge louvers are positioned correctly.

5. All service valves must be closed.

6. On units with crankcase heaters, ensure belly--band heaters are tight around the compressor.

Evacuate and Dehydrate the System

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation.

Never use the system compressor as a vacuum pump.

Using Vacuum Pump

1. Completely tighten flare nuts A, B, C, D, connect manifold gage charge hose to a charge port of the low side service valve (see Fig. 43).

2. Connect charge hose to vacuum pump.

3. Fully open the low side of manifold gage (see Fig. 44).

4. Start vacuum pump

5. Evacuate using either deep vacuum or triple evacuation method.

6. After evacuation is complete, fully close the low side of manifold gage and stop operation of vacuum pump.

7. The fact or y charge containe d in the outdoor unit is good for up to 25 ft. (8 m) of line length. For refrigerant lines longer than 25 ft (8 m), add char ge up to the maximum allowabl e length as specified in the Residential Long Line Application Guide.

CAUTION

A07201

500 microns

Low side valve

Charge hose

High side valve

Charge hose

Vacuum pump

Low side valve

A07361

Fig. 44 -- Manifold

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of pulling a vacuum of 500 microns and a vacuum gage capable of accurately measuring this vacuum depth. The deep vacuum method is the most positive way of assuring a system is free of air and liquid water (see Fig. 45).

5000 4500 4000 3500 3000 2500 2000

MICRONS

1500 1000

500

01234567

MINUTES

Fig. 45 -- Deep Vacuum Graph

LEAK IN SYSTEM

VACUUM TIGHT TOO WET

TIGHT DRY SYSTEM

A95424

Triple Evacuation Method

The triple evacuation method should only be used when vacuum pump is only capable of pumping down to 28 in. of mercury vacuum and system does not contain any liquid water. Refer to Fig. 46 and proceed as follows:

1. Pump system down to 28 in. of mercury and allow pump to continue operating for an additional 15 minutes.

2. Close service valves and shut off vacuum pump.

3. Connect a nitrogen cylinder and regulator to system and open until system pressure is 2 psig.

4. Close service valve and allow system to stand for 1 hr. During this time, dry nitrogen will be able to diffuse throughout the system absorbing moisture.

5. Repeat this procedure as indicated in Fig. 46. System will then be free of any contaminants and water vapor.

EVACUATE

BREAK VACUUM WITH DRY NITROGEN

WAIT

EVACUATE

BREAK VACUUM WITH DRY NITROGEN

WAIT

EVACUATE

CHECK FOR TIGHT, DRY SYSTEM

(IF IT HOLDS DEEP VACUUM)

RELEASE CHARGE INTO SYSTEM

A95425

Fig. 46 -- Triple Evacuation Method

To Start the Unit:

1. If the outdoor unit is equipped with a crankcase heater, turn on the indoor and outdoor disconnect switches to supply power to the system 6 hours before starting the system.

2. Release charge into the system by opening (back--seating) liquid and suction line service valves.

3. Set the wireless remote control or wired remote control below ambient temperature. Operate the unit for 15 minutes.

4. Refer to Table 12 to determine if additional charge is required. Also, if you have a long line application, refer to the Residential Long Line Application Guide to determine the additional charge that is required beyond 25 ft (7.6 m).

5. Charge should be added as liquid (not gas) slowly and carefully to low side to avoid liquid slugging.

6. Start unit with operation test. In test mode the unit will run in cooling and heating (on heat pumps) regardless if there is demand or not.

Test Operation For CASSETTE

Perform test operation after completing gas leak and electrical safety check. (See Fig. 47)

Manual button

OPERATION TIMER DEF./FAN ALARM

Fig. 47 -- Display Panel

1. Push the “ON/OFF” button on Remote Control to begin testing.

NOTE: A protection feature prevents air conditioner from being activated for approximately 3 to 4 minutes.

2. Push MODE button, select COOLING, HEATING, FAN mode to check if all functions work correctly.

3. To run the test using the manual button in the indoor unit:

S Push the manual switch once to energize the unit.

The set conditions of manual operation are as follows:

· Preset set point: 76

· Fan speed: AUTO

· Discharge air direction: Pre--set position based on operation in “Cool” or “Heat” mode

S Set manual switch to “OFF” (by pushing it twice again)

after finishing test operation.

NOTE: For Heat Pumps, follow the same procedure.

Drainage Test

a. Open the cover of water supply intake by turning and

pulling the cover.

b. Gradually insert a water bottle up into the fan coil unit

and fill drain pan.

c. Operate the unit under COOLING mode and check a

drain pump pumping (a time lag of 1 minute is allowed before water flowing out depending on the length of the drain pipe).

d. Check and confirm the water flows out through the drain

hose.

e. Check the drain water drops at the end of the drain pipe.

f. Make sure there is no water leak at the drainage

g. Reassemble the cover of water supply intake.

° F(24° C)

A150257

Drain pipe connection port

Water intake

Cover

Stow tube

To Clean or Replace Air Filters

1. Place a plastic sheet on the floor to catch any water that may spill from drain pan.

2. Slide filter out.

3. Vacuum clean or wash filter with soapy water. Rinse and let air dry. If filter needs replacing, filters are available from a local dealer.

Pump--down Procedure

The system may be pumped down in order to make repairs on the low side without losing complete refrigerant charge.

1. Attach pressure gage to suction service valve gage port.

2. Front--seat the mixed phase line valve.

Cover

A150288

Fig. 48 -- Drainage Test Detail

Water must flow regularly with condensate pump energized. If not, check the pipe slope or see if there are any pipe restrictions.

NOTE: The unit is equipped with a safety float switch to de--energize the compres sor if the drain pan water level gets too high.

Service and maintenance

WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or death. Before installing, modifying, or servicing system, main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch.

Lock out and tag switch with a suitable warning label.

Remove unit grille, filter, and condensate pan for cleaning, lubricating, or replacing parts.

WARNING

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or improper operation. The unit coils hold only the factory--designated amount of refrigerant.

Additional refrigerant may cause units to relieve pressure through the compressor internal pressure relief valve (indicated by a sudden rise of suction pressure) before suction pressure reaches 20 psig.

If this occurs, shut off unit immediately then front--seat the suction valve and remove and recover excess refrigerant following accepted practices.

3. Start unit and run until suction pressure reaches 5 psig.

4. Shut unit off and front-- seat suction valve.

5. Depressurize low side of unit and recover refrigerant following accepted practices.

Filter Drier

Whenever the filter drier is exposed to the atmosphere it must be replaced. Only use factory specified liquid--line filter driers with rated working pressures less than 600 psig.

NOTE: Do not install a suction-- line filter drier in the mixed phase line.

Refrigerant Charging

Minimum Maintenance

1. Check, clean, or replace air filter each month or as required.

2. Check cooling coil, drain pan, condensate trap, and condensate drain pan each cooling season for cleanliness. Clean as necessary.

3. Check fan motor and wheel for cleanliness each heating and cooling season.

4. Check electrical connections for tightness and controls for proper operation each heating and cooling season. Service as necessary.

WARNING

PERSONAL INJURY AND/OR EQUIPMENT DAMAGE HAZARD

Failure to follow this warning could result in personal injury and/or equipment damage. Wear safety glasses and gloves when handling refrigerant. Do not overcharge system -- this can cause compressor flooding.

All units are shipped with the refrigerant charge listed on nameplate. Ensure charging conditions stated int his document and the rating plate are followed.

NOTE: Do not vent or depressurize unit refrigerant to atmosphere. Remove and recover refrigerant following accepted practices.

TROUBLESHOOTING

Fault code

For ease of service, the indoor unit is equipped with diagnostic code display LEDs in the indoor units. This diagnostic display is a combination of flashing LEDs on the display panel or the front of the unit. If possible, always check the diagnostic codes displayed on the indoor unit. The diagnostic codes displayed in the indoor unit are listed in Table 21. Once a failure occurs with the indoor unit in operation, the green LED on the indoor unit flashes at intervals of 0.5 seconds. The fault code is deduced from the number of times the green LED flashes, blocking unit operation. Between one flash cycle and the next one, a pause of 3 to 4 seconds elapses.

Table 21 – Fault Codes

NO.

Open or short circuit of T1

temperature sensor

Open or short circuit of T2

temperature sensor

3 Indoor EEPROM

4 Water--level alarm X X X

5 Refrigerant leakage detection

NOTE: O (on) X(off) ☆(flash at 5Hz) ◎(flash at 0.5Hz)

Malfunction Running lamp Timer lamp

☆

X X X E3

☆ ☆

☆

X X

Defrosting

lamp

X X E2

X X E7

Alarm lamp

☆ ☆

Using the Emergency Button

The Emergency button is for use by a qualified service technician only. The Emergency button is for use when the room controller is inoperative. Use a small screwdriver to press the emergency button (see Fig. 47).

Manual operation can be accessed by pressing manual button on the display panel. Press the manual button repeatedly to change modes as follows:

S Once = AUTO mode [heat, cool or fan, 24 S Twice = COOLING mode [switches to AUTO mode after 30 minutes (mainly used for trial operation)]

S Three times = OFF

°C and auto fan speed.]

Display

(digital tube)

Table 22 – Troubleshooting

PROBLEM POSSIBLE CAUSE SOLUTION

Unit not energized Check the main power connection.

Compressor and Fan of the Outdoor Unit Will Not Start

Compressor Will Not Start, But Outdoor Fan is Operating

Compressor Stops Due to Over--- temperature

Compressor Runs Continuously

F r e q u e n t I c e --- B u i l d --- U p on Outdoor Coil

Discharge Pressure T oo High

Discharge Pressure T oo Low

Suction Pressure Too High

Suction Pressure Too Low

Outdoor Fan Cycling Due to Over---Temperature Protection

Main switch is set to OFF CheckandputittoONposition.

Main switch fuses are bl own Replace fuses.

Compressor cycling protection is on Wait for 3 minutes.

Main power voltage is too low Check and set to the correct voltage.

Electrical connections are too loose or are wrong Check and tighten or correct connections.

Electrical connections of compressor are loose or wrong Check and tighten or repair compressor.

Compressor burnt out; seized or protection device on

Wrong refrigerant charge in u nit (excessive or low) or air or other non---condensable gasses in the circuit

Main voltage is too high or too low Check voltage setting and adjust if necessary.

Condenser coil obstructed Remove obstruction.

Outdoor fan off Check cause and resume operation or repair.

Wrong indoor unit thermistors Replace thermistors.

Refrigerant circuit clogged Check and remove obstructions.

Reversing valve faulty on heat pump models Replace reversing valve.

Expansion device clogged or covered with ice

Unit selected is too smal l for application requirements

Indoor temperature setting too low or too high Check temperature setting.

Outdoor unit fan faulty Replace outdoor fan.

Air or other non---condensable gasses in the circuit

Obstructions at air intake or dirty indoor unit filters Remove obstruction and/or clean filter.

Outdoor fan is stopped Check cause and repair.

Outdoor coil dirty or obstructed Clean or remove obstructions.

Condenser fan faulty Replace condenser fan.

Indoor temperature setting too low or too high Check temperature setting.

Air or other non---condensable gasses in the circuit

Indoor temperature setting too high or too low Check temperature setting.

Outdoor coil dirty or obstructed Clean or remove obstructions.

Indoor unit air filter dirty Clean filter.

Indoor temperature setting too high or too low Check temperature setting.

Reversing valve faulty or internal leak Replace reversing valve.

Indoor temperature setting too high or too low Check temperature setting.

Evaporator coil covered with ice

Expansion device or suction line clogged Check and repair.

Outdoor fan does not stop during defrost periods Check electrical parts.

Electrical connection loose Check connections.

Fan motor burn out Replace.

Fan bearing seized Check and repair.

Expansion device clogged or covered with ice

NOTE: For additional diagnostic information, refer to the “Service Manual”.

Check for the cause and repl ace compressor if necessar y.

Drain refrigerant, evacuate and recharge. CAUTION: Do not vent refrigerant to the atmosphere; use refrigerant recovery equipment.

Contact a qualified service technician for a system evaluation.

Drain refrigerant, evacuate and recharge. CAUTION: Do not vent refrigerant to the atmosphere; use refrigerant recovery equipment.

Air circulation on the evaporator not sufficient; check and repair.

Drain refrigerant, evacuate and replace. CAUTION: Do not vent refrigerant to the atmosphere; use refrigerant recovery equipment.

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

C a t a l o g N o : 4 0 M K C B --- C --- 0 1 S I

Replaces: NEW

Carrier 40MKQB user guide manual

Specifications and Main Features

Frequently Asked Questions

User Manual