Carrier 40MUAAQ18XB3 Bedienungsanleitung

Specifications subject to change without notice.

TABLE OF CONTENTS

PAGE

SAFETY CONSIDERATIONS ....................................................... 1

INTRODUCTION............................................................................ 1

MODEL NUMBER NOMENCLATURE ....................................... 2

AUXILLIARY CONTACTS FOUND ON THE MAIN BOARD .. 3

ROTARY AND DIP SWITCHES ................................................... 6

INDOOR UNIT WIRING................................................................ 8

WIRING REQUIREMENTS ........................................................... 9

CONNECTION DIAGRAMS ......................................................... 10

WIRING DIAGRAMS..................................................................... 11

REFRIGERANT LINES .................................................................. 12

TROUBLESHOOTING ................................................................... 13

DIAGNOSIS AND SOLUTION...................................................... 16

DISASSEMBLY INSTRUCTIONS ................................................ 35

APPENDICES.................................................................................. 41

SAFETY CONSIDERATIONS

Installing, starting up, and servicing air-conditioning equipment can

be hazardous due to unit pressures, electrical components, and

equipment location (roofs, elevated structures, etc.).

Only trained, qualified installers and service mechanics should install,

start-up, and service this equipment.

Untrained personnel can perform basic maintenance functions such as

coil cleaning. All other operations should be performed by trained

service personnel only.

When working on the equipment, observe the precautions in the

literature and on tags, stickers, and labels attached to the equipment.

Follow all safety codes. Wear safety glasses and work gloves. Keep a

quenching cloth and fire extinguisher nearby when brazing. Use care

in handling, rigging, and setting bulky equipment.

Read this manual thoroughly and follow all the warnings or cautions

included in the literature and attached to the unit. Consult local building

codes and the National Electrical Code (NEC) for special requirements.

Recognize safety information. This is the safety-alert symbol .

When you see this symbol on the unit and in instructions or manuals,

be alert to the potential for personal injury. Understand these signal

words: DANGER, WARNING, and CAUTION.

These words are used with the safety-alert symbol. DANGER

identifies the most serious of 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 personal injury or product

and property damage. NOTE is used to highlight suggestions which

will result in enhanced installation, reliability, or operation.

INTRODUCTION

This service manual provides the necessary information to service,

repair, and maintain the indoor units. This manual contains an

“DISASSEMBLY INSTRUCTIONS” on page 35 with data required to

troubleshoot issues. Use the “TABLE OF CONTENTS” on page 1 to

locate a desired topic.

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or

death. Before installing, modifying, or servicing the unit, the

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.

WA R N I N G

EXPLOSION HAZARD

Failure to follow this warning could

result in death, serious personal

injury, and/or property damage.

Never use air or gases containing

oxygen for leak testing or operating

refrigerant compressors. Pressurized

mixtures of air or gases containing

oxygen can lead to an explosion.

WAR NI NG

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage

or improper operation.

Do not bury more than 36 in. (914 mm) of refrigerant pipe in the

ground. If any section of pipe is buried, there must be a 6 in. (152

mm) vertical rise to the valve connections on the outdoor units. If

more than the recommended length is buried, refrigerant may

migrate to the cooler buried section during the extended periods

of unit shutdown. This causes refrigerant slugging and could

possibly damage the compressor at start-up.

CAUTION

Service Manual

40MUAA

Air Handler Unit

Sizes 18 to 60

40MUAA: Service Manual

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

MODEL NUMBER NOMENCLATURE

Table 1 — Unit Sizes

KBTUH V-PH-HZ ID MODEL NO.

208/230-1-60

40MUAAQ18XB3

40MUAAQ24XB3

40MUAAQ30XB3

40MUAAQ36XA3

40MUAAQ36XB3

40MUAAQ48XA3

40MUAAQ60XA3

INDOOR UNIT

MU AQ24 XA3

40 = INDOOR UNIT

M = SUPPLIER

U = UNITARY VOLTAGE

3 = 208/230-1-60

INDOOR FAN COIL UNIT TYPE

A = AIR HANDLER

UNIT TYPE

Q = Heat Pump X = Indoor Unit

NOMINAL CAPACITY

18 - 1 1/2 TON

24 - 2 TONS

30 - 2 1/2 TONS

36 - 3 TONS

48 - 4 TONS

60 - 5 TONS

A = Light Commercial

B = Non Light Commercial

MAJOR SERIES

Lorem ipsum

22 10001

Week of Manufacture Sequential Serial Number

V = ALL MODELS

Year of Manufacture

Use of the AHRI Certified

TM Mark indicates a

manufacturer’s

participation in the

program For verification

of certification for individual

products, go to

www.ahridirectory.org.

40MUAA: Service Manual

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

AUXILLIARY CONTACTS FOUND ON THE MAIN BOARD

Work Terminal Port CN23 - Normally Open Dry Contact (Output)

•The

WORK

terminal port is linked to the unit's indoor blower

• When the indoor blower is off, the contact is open

• When the indoor blower is running, the contact is closed

• There is no voltage from CN23, power is provided from the external control system and not from the unit.

• The contacts are rated at 250VAC and 10 AMP maximum

• If an active 24V signal output is required, G and C ports (thermostat connections) may be used instead.

Fig. 1 — Auxiliary Contacts

ALARM Terminal Port CN33 - Normally Open DRY CONTACT (OUTPUT):

• Allows the terminal port to connect to an external

ALARM

interface or annunciator

• There is no voltage from

CN33

, power is provided from the

ALARM

system and not from the unit

• The contacts are rated at

250VAC

and 10 AMP maximum

• When the unit experiences a problem, the contact closes, and the

ALARM

is triggered.

Fig. 2 — Auxiliary Contacts

40MUAA: Service Manual

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

WATER LEVEL Switch Terminal Port CN5 - SWITCH INPUT:

• To enable this switch, jumper

must be removed

• A field supplied float switch can be directly connected to

CN5

• CLOSED contacts = normal

• OPEN contacts = overflow

• When an overflow condition occurs, a signal is sent to the system to turn it off

•Alarm

appears.

Fig. 3 — Auxiliary Contacts

UV LED Terminal Port CN43 - OUTPUT 24VAC:

•The

LED

port is linked to the unit's fan

• When the fan is running, the relay is closed and there is an output of

24VAC

through the contacts that can be used to power a compatible

UV LED LIGHT

• May also be used to power a pilot relay with

24VAC

coil to control other peripherals

NOTE: After the serial number (0223V26809), the CN43 feature is available.

Fig. 4 — Auxiliary Contacts

40MUAA: Service Manual

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

Auxiliary Contacts found on the 24V interface Board:

Remote control (ON-OFF) terminal port CN2 and jumper JR1 - INPUT:

• Remove the jumper

JR1

to enable the

ON-OFF

function

• When the remote switch is off (

OPEN

); the unit is

OFF

• When remote switch is on (

); the unit is

• When the remote switch is close/open, the unit responds to the demand within 2 seconds

• When the remote switch is on, you can use the included remote controller or wired controller to operate the unit as normal.

• When the remote switch off, the unit will not respond to the command from the remote controller or wired controller and a CP code is displayed on the

board.

Fig. 5 — Auxiliary Contacts

40MUAA: Service Manual

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

ROTARY AND DIP SWITCHES

Micro-Switch Setting:

Fig. 6 —Net Address

Micro-switch S1 and dial-switch S2 are for address setting when the user wants to control the unit with a central controller.

Range: 00-63

Fig. 7 — Unit Configuration

Fig. 8 — Unit Configuration Factory Settings

S1+S2

0~F 0~F 0~F 0~F

NETADDRESS

CODE

0~15 16~31 32~47 48~63

FACTORYS ETTING

FOR SETTING NETADDRESS

0~F

ON~OFF

CODE

FACTORY

1 2 3

SW1

12 3

SW2

1 2 3

SW3

12 3

SW4

24V THERMOSTATS SETTING

SETTI

ON~OFF ON~OFF ON~OFF ON~OFF

40MUAA: Service Manual

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

Connectors

Table 2 — Unit Configuration Settings

*NOTE: Auto detection is available after serial number 0223V26809. With this feature active, the system detects the wiring

method according to the 3 control scenarios automatically with all SW1 dip switches set to default.

NOTE: After the serial number (0223V26809) the auto detection feature is available; prior to the serial number cutoff, the

control scenario needs to be set for Scenario 1(SW 1-1 ON) and Scenario 3(SW 1-1 and SW 1-4 ON).

Dial Code Control Scenario Function ON OFF

SW1-1*

OFF for 2 ON for 1 and 3

Please note: SW 1-4

needs to be ON as well

for Scenario 3

Control Function 24 V Communication [Default] Auto Detect or RS485 S1-S2

Communication

SW1-2 1,2 Anti-cold blow protection option NO [Default] YES

SW1-3 1,2,3 Single cooling / heating and cooling

options Cooling [Default] Cooling & Heating

SW1-4*

OFF for 1 and 2 ON for 3

Please note: only active

for scenario 3 when

used with SW 1-1 ON

Control Function Scenario 3 [Default] Auto Detect or Scenario 1

SW2-1 1

Compressor Running Compensation

(Demand working with heat pump+

Electric heat)

Compressor slower speed [Default] Faster Compressor

SW2-1 2

Temperature differential to activate

first stage auxiliary heat (the GAP of

T1 and Ts) Wire controller demand

with heat pump + Electric heat

working together

2F [Default] 4F

SW2-2 2 Electric heat on delay YES [Default] NO

SW2-3 2 Electric auxiliary heating delay to start

time 30 minutes [Default] 15 minutes

SW2-4 2 Compressor/Auxiliary heat outdoor

ambient lockout

The compressor does not operate if

the outdoor temperature is lower than

the temperature represented by S3

[Default] The heater does not operate if

the outdoor temperature is greater than

the temperature represented by S3

Rotary

Switch S3 2Set outdoor temperature Limitation

(for auxiliary heating or compressor)

0 means that the temperature

protection is not turned on, the dial

range is 1 through F, 1 equals -4°F

and it increased up to 46°F

SW3-1 1

Maximum continuous runtime allowed

before system automatically stages

up capacity to satisfy set point. This

adds 1 to 5°F to the user set point in

the calculated control point to

increase capacity and satisfy user set

point

30 minutes [Default] 90 minutes

SW3-2 1 Cooling and heating Y/Y2 compressor

speed adjustment. Compressor slower speed [Default] Faster Compressor

SW3-3 1

Compressor Running (demand

working with heat pump+ Electric

heat)

Compressor slower speed [Default] Faster Compressor

SW3-3 2

Temperature differential to activate

second stage auxiliary heating (the

GAP of T1 and Ts) Wire controller

demand with heat pump + Electric

heat working together

4F [Default] 6F

SW3-4 1,3 Fan speed of the COOLING mode

when 24V thermostat is applied for. Turbo Off

SW4 1,2,3 Electric heat nominal CFM adjustment

Available settings are 000/001/010/

011. Each digit corresponds an

individual switch position

(e.g. [SW4-1 OFF, SW4-2 ON,

SW4 -3 OFF] = 010).

S4-1 1,3 Default ON

[Default] For single stage

supplemental heat, W1 and W2 are

connected

For dual stage supplemental heat, W1

and W2 are controlled independently.

S4-2 1,3 DH function selection [Default] Dehumidification

control not available

Dehumidification feature is enabled

through thermostat

40MUAA: Service Manual

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

INDOOR UNIT WIRING

Before proceeding with electrical connections, make certain that the

supply voltage, frequency, phase, and ampacity are as specified on the

unit rating plate. Review the unit wiring label for proper field high and

low voltage wiring.

Ensure all electrical connections are in accordance with the NEC and any

local codes or ordinances that may apply. Use copper wire only.

Use the following steps to wire the indoor unit.

NOTE: Wiring in this section is for the base unit ONLY.

1. Prepare the cable for connection.

a. Using wire strippers, strip the insulation from both ends of the

signal cable to reveal about 1/2 in (12mm) of wire.

b. Strip the insulation from both ends of the wires.

c. Use a wire crimper to crimp the fork terminals to the ends of

the wires.

2. Open the indoor unit’s front panel. Use a screwdriver to remove the

cover of the electric control box on the indoor unit.

3. Thread the power cable and the signal cable through the wire outlet.

4. Connect the fork terminals to the terminals. Match the wire colors/

labels with the labels on the terminal block.

5. Firmly screw the fork terminals of each wire to its corresponding

terminal. Refer to the serial number and wiring diagram located on

the cover of the electric control box.

A220802

Fig. 9 — Indoor Unit Power Wiring

NOTE: The electric auxiliary heat wiring diagram is supplied with

the accessories. Paste the wiring diagram in the designated

position after installing the heat modules.

IMPORTANT: A separate power supply is required for an

Auxiliary Electric Heater. Do not power the electric heater

directly from the outdoor unit. Always follow the

recommendations listed in the installation instructions

manuals. Refer to the EHKMB Installation Manual

6. Clamp down the cable with the cable clamp. The cable must not be

loose or put strain on the fork terminals.

7. Reattach the electric box cover.

A220826

Fig. 10 —Controls and Power Terminals on Indoor Unit

(All Sizes)

PROPERTY DAMAGE HAZARD

Failure to follow this caution may result in product or property

damage. If a disconnect switch is to be mounted on the unit, select

a location where the drill or fastener will not contact electrical or

refrigerant components.

CAUTION

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal injury or

death. Field wires on the line side of the disconnect found in the

fan coil unit remain live, even when the pull-out is removed.

Service and maintenance to incoming wiring cannot be performed

until the main disconnect switch (remote to the unit) is turned off.

WAR NI NG

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment damage or

improper operation. Size the wires in accordance with NEC and

local codes.

CAUTION

While connecting the wires, strictly follow the wiring diagram.

The refrigerant circuit can become very hot.

Keep the interconnection cable away from the copper tube.

CAUTION

40MUAA: Service Manual

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

WIRING REQUIREMENTS

Size all wires per the NEC (National Electrical Code) or CEC (Canadian

Electrical Code) and local codes. Use the electrical data from the outdoor

unit (MCA - minimum circuit amps and MOCP - maximum over current

protection), to correctly size the wires and the disconnect fuse or breakers

respectively.

Communication Wiring: There are two options available to establish

communication between the outdoor unit and approved indoor unit.

Table 3 — Options for Establishing Communication

NOTE: Separate power is required for an Auxiliary Electric

Heater.

OPTIONS COMMUNICATION TYPE RECOMMENDED CABLE SIZE

1Non-Polarity RS485

Communication (S1 - S2) 16 AWG (stranded shielded)

2 24V communication 18 AWG 8 conductor

thermostat wire

Refer to the wiring template for the wiring method.

DO NOT connect the power cord to the communication line as

this may damage the system.

WA R N I N G

EQUIPMENT DAMAGE HAZARD

Be sure to comply with local codes while running wire from the indoor

unit to the outdoor unit.

Every wire must be connected firmly. Loose wiring may cause the

terminal to overheat or result in a unit malfunction. A fire hazard may also

exist. Ensure all wiring is tightly connected.

No wire should touch the refrigerant tubing, compressor or any moving

parts.

Disconnecting means must be provided and located within sight and

readily accessible from the system. Route the connecting cable with

conduit through the hole in the conduit panel.

CAUTION

EQUIPMENT DAMAGE HAZARD

Comply with local codes while running wire from the indoor unit to the outdoor

unit. Every wire must be connected firmly. Loose wiring may cause the

terminal to overheat or result in a unit malfunction. A fire hazard may also exist.

Ensure all wiring is tightly connected.

No wire should touch the refrigerant tubing, compressor or any moving parts.

Disconnecting means must be provided and located within sight and readily

accessible from the system. Route the connecting cable with conduit through

the hole in the conduit panel.

CAUTION

40MUAA: Service Manual

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

CONNECTION DIAGRAMS

Scenario 1 - Non-Polarity RS485 Communication + 24V Thermostat

This is the preferred method when using a 24V thermostat and when the indoor unit communicates with the outdoor unit via RS485 (S1/S2) protocol.

NOTE: After the serial number (0223V26809), the Auto Discovery feature is available.

Fig. 11 — Scenario 1

Scenario 2 - Non-Polarity RS485 Communication

This is the preferred method of control with wired controller KSACN1001AAA (Not included)

Fig. 12 — Scenario 2

Scenario 3 - Full 24V Communication

This method allows for 24 communication between a 24V thermostat, the indoor unit and the outdoor unit.

Fig. 13 —Scenario 3

NOTE: For scenarios 2 and 3 - The use of shielded communication or thermostat wire is not required but is recommended

where separation from high voltage conductors cannot be maintained, or in areas with high electrical noise. The shield

and drain conductor must be grounded at the outdoor unit and stripped back and taped at the indoor unit. Grounding

at both ends results in an increase of noise transmitted onto the signal wires.

Outdoor Unit

RCGY1Y2BW W1W2EDHL

24V Thermostat

Indoor Unit Display Board

RCGY1Y2BWW1W2EDHL S1S2

S1 S 2RCY1Y2BWDL

Control

Board

SW1

1 2 3 4

Refer to the wiring nameplate for the wiring method.

DO NOT connect 24V AC to S1-S2, as this will damage the

system.

WA R N I N G

RCY1Y2BW D L

Outdoor Unit

Indoor Unit Display Board

RC L GY1

Y1/Y2

BWW1W2EDH

S1 S2

S1 S 2

Wired

Controller

Wired

Controller

HA HB

Control

Board

SW1

1 2 3 4

Outdoor Unit

RCGY1Y2BW W1W2EDHL

24V Thermostat

Indoor Unit Display Board

RCGY1Y2BWW1W2EDHL S1S2

S1 S 2RCY1Y2BWDL

Control

Board

1 2 3 4

SW1

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