Lg Pahcms000 User manual

INSTALLATION MANUAL

FOR LG AIR HANDLER UNIT (AHU)

COMMUNICATIONS KIT

AHU Model Number: PAHCMS000

For continual product development, LG Electronics U.S.A., Inc. reserves the right to change specifications without notice.

PROPRIETARY DATA NOTICE

This document, as well as all reports, illustrations, data, information, and other materials are the property of

LG Electronics U.S.A., Inc., and are disclosed by LG Electronics U.S.A., Inc. only in confidence.

For more materials such as submittals, catalogs, engineering,

installation, owner’s, and service manuals, visit www.lghvac.com.

Do not throw away, destroy, or lose this manual.

Please read carefully and store in a safe place for future reference.

Content familiarity required for proper installation.

The instructions included in this manual must be followed to prevent product malfunction, property damage, injury, or death to the user or

other people. Incorrect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the

symbols described by the summary list of safety precautions on page 3.

3

Due to our policy of continuous product innovation, some specications may change without notication.

TABLE OF CONTENTS

Safety Precautions ..........................................................................................................................................................................4

AHU Kit Introduction.......................................................................................................................................................................7

Specications, Components List...................................................................................................................................................8

AHU Communications Kit Installation...........................................................................................................................................9

Selecting the Best Location��9

DIP Switch Settings ��10

AHU Communications Kit Parts ��13

AHU Communications Kit Mounting ��14

Power Wiring ��18

Communications Wiring��19

Controller Settings��20

Solutions Overview��24

Main Module Settings��27

Communication Module��31

Defrost Setting��32

External Connection Diagrams��33

Discharge Air Temperature Controller��37

EEV Kit Installation........................................................................................................................................................................45

Introduction, Specications, and Design Parameters��45

EEV Kit Parts��46

Mounting the EEV Kit ��48

Preparing the Pipes��49

Brazing and Insulating the Piping��50

PRLK048A0 and PRLK096A0 Wiring��51

PRLK396A0 Wiring��52

Control Functions ��53

Testing ............................................................................................................................................................................................57

Troubleshooting ............................................................................................................................................................................58

4

PRDCAM AHU Communication Kit Installation Manual

Due to our policy of continuous product innovation, some specications may change without notication.

TABLE OF SYMBOLS

This symbol indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury�

This symbol indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury�

This symbol indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury�

This symbol indicates situations that may result in equipment or property damage accidents only�

This symbol indicates an action should not be completed�

DANGER

CAUTION

The instructions below must be followed to prevent product malfunction, property damage, injury or death to the user or other people. Incor-

rect operation due to ignoring any instructions will cause harm or damage. The level of seriousness is classified by the symbols described

below.

Installation

All electrical work must be performed by a licensed electri-

cian and conform to local building codes or, in the absence

of local codes, with the National Electrical Code, and the

instructions given in this manual.

If the power source capacity is inadequate or the electric work is not

performed properly, it may result in re, electric shock, physical injury or

death�

Do not touch the communications and EEV kits’ wir-

ing, terminals, or other electrical components with tools or

exposed skin when the power is connected. Only qualied

technicians should install, remove, or re-install the kits.

Improper installation or use may result in re, electric shock, physical

injury or death�

Do not install, remove, or re-install the communications

and EEV kits by yourself (end user). Ask the dealer or a qual-

ied technician familiar with safety procedures and equipped

with the proper tools and test instruments to install the kits.

Improper installation by the user may result in re, electric shock, physi-

cal injury or death�

For replacement of an installed communications and EEV

kits, always contact a qualied LG service provider familiar

with safety procedures and equipped with the proper tools

and test instruments.

There is risk of re, electric shock, and physical injury or death.

Do not install the communications and EEV kits in a loca-

tion where the kits can be exposed to rain, snow, etc.

There is risk of physical injury or death due to electric shock�

Safely dispose of the packing materials.

Tear apart and throw away plastic packaging bags so that children may

not play with them and risk suffocation and death�

Wear protective gloves when unpacking, installing, and han-

dling the kits. Sharp edges may cause personal injury.

Do not install the communications and EEV kits in loca-

tions where either kit could fall down.

There is risk of physical injury�

Use the appropriate parts and connectors.

There is risk of physical injury or death due to re and / or electric shock.

Replace all control box and panel covers on the communica-

tions and EEV kits.

If cover panels are not installed securely, dust, water, and animals may

enter the kits, causing re, electric shock, and physical injury or death.

Failure to carefully read and follow all instructions in this

manual can result in physical injury or death.

Only qualied technicians familiar with safety procedures

and equipped with the proper tools and test instruments

should install, remove, or re-install the communications and

EEV kits.

Improper installation or use may result in product malfunction�

Do not install the communications and EEV kits in a

location where the kits can be exposed to rain, snow, etc.

There is risk of product malfunction�

Do not drop the communications and EEV kits.

It may damage the products�

Failure to carefully read and follow all instructions in this

manual can result in property damage and equipment mal-

function.

SAFETY PRECAUTIONS

5

Safety Precautions

Due to our policy of continuous product innovation, some specications may change without notication.

SAFETY PRECAUTIONS

Do not supply power to the communication and EEV kits

until all electrical wiring, controls wiring, piping, installation,

and refrigerant evacuation are completed for the whole air

conditioning system.

The information contained in this manual is intended for use

by an industry-qualied, experienced, certied electrician

familiar with the U.S. National Electric Code (NEC) who is

equipped with the proper tools and test instruments.

Failure to carefully read and follow all instructions in this manual can

result in equipment malfunction or property damage�

The information contained in this manual is intended for use

by an industry-qualied, experienced, certied electrician

familiar with the U.S. National Electric Code (NEC) who is

equipped with the proper tools and test instruments.

Failure to carefully read and follow all instructions in this manual can

result in personal injury or death�

All electric work must be performed by a licensed electrician

and conform to local building codes or, in the absence of

local codes, with the National Electrical Code, and the

instructions given in this manual.

If the power source capacity is inadequate or the electric work is not

performed properly, it may result in re, electric shock, physical injury or

death�

Refer to local, state, and federal codes, and use power wires

of su󰀩cient current capacity and rating.

Wires that are too small may generate heat and cause a re and physi-

cal injury or death�

Secure all eld wiring connections with appropriate wire

strain relief.

Improperly securing wires will create undue stress on equipment power

lugs. Inadequate connections may generate heat, cause a re and

physical injury or death�

Verify that all power wiring, plugs, and sockets are not loose

or damaged.

Loose wiring may overheat at connection points, causing a re, electrical

shock, physical injury or death�

WIRING

DANGER

High voltage electricity is required to operate the commu-

nications and EEV kits. Adhere to the NEC code and these

instructions when wiring.

Improper connections and inadequate grounding can cause accidental

injury or death�

Always ground the communications and EEV kits following

local, state, and NEC codes.

There is risk of re, electric shock, and physical injury or death.

Turn the power o󰀨 at the nearest disconnect before servicing

the equipment.

Electrical shock can cause physical injury or death�

Properly size all circuit breakers or fuses.

There is risk of re, electric shock, explosion, physical injury or death.

Communication kit requires its own power source (EEV kit

is powered o󰀨 of Communication kit). Do not share the

power source with other equipment.

There is risk of heat generation which may cause re, electric shock,

explosion, physical injury or death�

6

PRDCAM AHU Communication Kit Installation Manual

Due to our policy of continuous product innovation, some specications may change without notication.

Do not install the communications and EEV kits in loca-

tions exposed to open ame or extreme heat. Do not touch

the kits with wet hands.

There is risk of re, electric shock, physical injury or death.

Do not modify or extend the power supply cords.

There is risk of re, electric shock, physical injury or death.

Do not step or place anything on the communications

and EEV kits.

If the product falls, there is risk of physical injury�

Do not place heavy objects on the communications and

EEV kits’ power cables.

There is risk of re, electric shock, physical injury or death.

Only authorized persons should operate the communications

and EEV kits.

If the kits are not operated properly, there is a risk of physical injury�

Do not provide power to or operate communication and

EEV kits if the kits are ooded or submerged. Always have

the dealer or an authorized technician to service the kits.

There is risk of re, electric shock, physical injury or death.

Do not store or use ammable gas or combustibles near

the communications and EEV kits.

There is risk of re, explosion, and physical injury or death.

Unplug the communication and EEV kits if either kit emits

strange sounds, smells, or smoke.

There is risk of re, electric shock, physical injury or death.

Do not let the communication and EEV kits get wet.

There is risk of product failure or malfunction�

Only authorized persons should operate the communication

and EEV kits.

There is risk of product failure or malfunction�

Do not drop the communications and EEV kits.

There is risk of product failure or malfunction�

Do not step or place anything on the communications

and EEV kits.

If the product falls, there is risk of product damage�

OPERATION

DANGER

CAUTION

SAFETY PRECAUTIONS

7

General Specifications

Due to our policy of continuous product innovation, some specications may change without notication.

AHU KIT INTRODUCTION

Figure 1: PAHCMS000 AHU

Communications Kit.

Figure 2: AHU Communications Kit System Schematic.

Introduction

The PAHCMS000 AHU Communications Kit bridges LG’s air conditioning outdoor unit to a third party Air

Handling Unit (AHU). Its function is based on discharge or supply air temperature control. In installations

where the AHU is designed with Direct Expansion (DX) Coil, the PAHCMS000 will control the supply air

temperature by measuring the inlet and outlet temperatures of the DX coil and changd the operation of

the outdoor unit and the expansion unit. PAHCMS000 AHU Communications Kit features are:

• It can be used with LG Multi V air or water source outdoor units and LG Single Zone outdoor units.

• It supports AHU coil capacities from 12 - 594 kBtu/h.

• It controls the Electronic Expansion Valve (EEV, required, sold separately)

• It measures the supply air temperature through the enclosed temperature sensor and controls the

outdoor unit to secure the demanded supply air temperature.

• It can be directly connected to direct digital control (DDC) without a separate control module, so DDC

can receive product control and status information through Modbus communication.

• The PAHCMS000 AHU Communications Kit consists of a chassis, communication module, pipe-in

thermistor, pipe-out thermistor, and return air thermistor.

• Supply air temperature control is possible without DDC.

• It increases heating comfort by applying sequential defrost logic and simultaneous defrosting preven-

tion logic of the outdoor unit.

Control Signal (field supplied)

Pipe

Thermistor Signal

Refrigerant ﬂow (cooling)

Refrigerant ﬂow (heating)

LG Wired

Controller2

Third-Party

AHU

Controller1

Air ﬂow

LG AHU

EEV Kit

Third-Party

Air Handling

Unit

LG Multi V

Air Source or

Water Source Unit4

1Third-party AHU controller is recommended.

2LG wired controller (required accessory) functions as error code display only.

No system control available.

3Return air temperature thermistor can be replaced with fixed resistor when AHU

controller is using third-party temperature sensors.

4Compatible units are Multi V and Single Zone.

Return Air

Thermistor3

Max

Length

32 feet

LG AHU

Comm Kit

PAHCMS000

Vapor

Piping

Liquid

Piping

Pipe Out

Sensor (Vapor)

Pipe In

Sensor

(Liquid)

8

PRDCAM AHU Communication Kit Installation Manual

Due to our policy of continuous product innovation, some specications may change without notication.

Specifications

Table 1: PAHCMS000 AHU Communications Kit Specications Table.

AHU Communications Kit Components

Table 2: PAHCMS000 AHU Communications Kit Components Table (factory supplied).

Kit Model Number PAHCMS000

For Use With Multi V and Single Zone

Power Supply Requirements 208-230VAC, 60Hz, 1Ph

Rated Current 0.1A

Ambient Operating Temperature Range -4 to +149°F

Ambient Operating Humidity Range 0 to 98% (Non-condensing)

Dimensions (in., W x H x D) 14-31/32” W x 6-3/32” H x 11-13/16” D

Net Weight (lbs.) 16.5

Shipping Weight (lbs.) 19.4

Communications RS-485 (4 wires required: 2 connect to IDU A/B terminals and 2 connect to UI4/G terminals on ODU)

Communications Cable AWG 18 x 4 Stranded, Shielded Copper Cable

Part Quantity Image

AHU

Communications Kit One (1)

Return Air (Room)

Thermistor One (1)

Pipe Thermistor

Two (2)

(One [1] Pipe In,

One [1] Pipe Out)

AHU COMMUNICATIONS KIT SPECIFICATIONS,

COMPONENTS LIST

9

Installation

Due to our policy of continuous product innovation, some specications may change without notication.

AHU Communications Kit Design Parameters

• Minimum coil entering air temperature is 41°F when system is operating in heating mode.

• AHU coil sizing parameters:

• Suction (evaporating) temperature for coil sizing is 41°F, Condensing (liquid) temperature for coil sizing is 110°F.

• Recommended coil tube sizes: 3/8 or 1/2 inches.

• Coil volume is needed to calculate additional refrigerant charge amount.

• Coils larger than 16 tons should be divided into multiple circuits to allow EEV Kit connection kit (EEV Kit sold separately).

• Pipe sizing rules are same rules as the connected air-source or water-source heat pump (see respective Engineering and Installation

Manuals for more information).

• Maximum recommended combination ratio is 100%.

• AHU Communications Kits and EEV Kits (sold separately) are not weatherproof and must be protected from rain, snow, etc.

AHU COMMUNICATIONS KIT INSTALLATION

Selecting the Best Location

AHU Operation Range

Range of the heat exchanger inlet air temperature is 64.4 to 104°F for cooling, and 41 to 86°F for heating. If the temperature is <64.4°F

for cooling and >86°F for heating, the system might cycle on and off because of the system’s protection logic.

Application Condition

100% outside air intake: The AHU(s) is (are) the only indoor unit(s)

connected to the air-source / water-source heat pump unit(s).

The total capacity of 100% outside air intake AHU(s) should be

50~100% of the air-source / water-source heat pump.

To measure room temperature accurately, install the room thermistor in the heat exchanger inlet� If the room thermistor is not installed

properly, the AHU may not operate properly. Room thermistor can be replaced with xed resistor when using a third-party AHU controller.

Table 3: AHU Application and Condition.

Selecting the Best Location

Do

• Install the AHU Communications and EEV Kits with the access panels facing outward.

• Install in a location that can support the weight of the kits.

• Install the EEV kit on the AHU as close as possible to the heat exchanger.

Don’t

• Don’t install or operate the unit in an area where mineral oils, sulphuric gases, acidic or alkaline vapors or spray are present.

• Don’t install in an area where the air contains high levels of salt (oceanside locations).

• Don’t install in vehicles or vessels.

• Don’t install in an area where voltage fluctuates significantly (factories), or near machines that generate electromagnetic waves.

10

PRDCAM AHU Communication Kit Installation Manual

Due to our policy of continuous product innovation, some specications may change without notication.

Communication Module

Main Module

The default setting of all DIP switches is “off”

etoNgnitteSmetIoNemanW/S

SW1

1 Control Type

On Communication Controlled by DDC through Modbus or LG centralized controller

Off Contact signal Controlled by DDC through Contact signal AI and DI

LG Centralized controller can only monitor status

2Discharge Temp.

Control Type

On Stand alone Discharge temp. control by LG controller using own discharge

temp. sensor

Off Manual by DDC Discharge temp. control by DDC using filed supplied discharge

temp. sensor

3Defrost Operation

Type¹

On Normal In case of multiple outdoor units, Defrost operation can be oper-

ated simultaneously

Off Sequential

Start up

In case of multiple outdoor units, the outdoor unit is sequentially

started at intervals of 10 minutes

4

Central

Communication

Type

On LG Central Comm Modbus Communication

Off - Not Used

SW2

1ODU Capacity

Control

On ODU Capacity

Setting #2 ODU capacity control #2

Off ODU Capacity

Setting #1 ODU capacity control #1

---devreseR2

---devreseR3

---devreseR4

SW3

---devreseR1

---devreseR2

---devreseR3

---devreseR4

SW4

---devreseR1

---devreseR2

---devreseR3

---devreseR4

Note:

1. Function of defrost operation type can be applied only to Multi V outdoor units (after MULTI V 5 model).

Figure 3: Main Module DIP Switches.

Table 4: Main Module DIP Switch Settings

AHU COMMUNICATIONS KIT INSTALLATION

DIP Switch Settings

11

Installation

Due to our policy of continuous product innovation, some specications may change without notication.

AHU COMMUNICATIONS KIT INSTALLATION

DIP Switch Settings

Communication Module

Main Module

The default setting of all dip switch is set “off”

Note :

1. Do not change the settings of reserved switches. Changing these settings can result in equipment malfunction.

etoNgnitteSmetIoNemanW/S

SW1

1 ODU Type On Single Comm Using Single Split outdoor unit

Off MULTI V Comm Using MULTI V outdoor unit

2 Control Type On Communication Controlled by Modbus between modules

Off Contact signal Not used

3 DO Type On Fan Speed Not used

Off Status Not used

4Fan Speed

(TH. On/Off)

On Fixed Not used

Off Change Not used

SW2

---devreseR1

---devreseR2

3/4 UI Setting

Off/Off UI Setting #1 Not used

Off/On UI Setting #2 Not used

--ffO/nO

--nO/nO

SW3

1 Master/Slave On Slave mode Not used

Off Master mode Master is default

2/3 Operation mode

setting

Off/Off Heat Pump Cooling or Heating operation mode is available

Off/On Heating Only Operation mode is Heating only (Heating / Ventilation)

On/Off Cooling Only Operation mode is Cooling only (Cooling / Ventilation )

-devreseRnO/nO

---devreseR4

SW4 1~4 Capacity Index

Setting - - According to ODU Type, you can setup the capacity index of

MULTI V or Single Split

Figure 4: Communications Module DIP Switches.

Table 5: Communications Module DIP Switch Settings

12

PRDCAM AHU Communication Kit Installation Manual

Due to our policy of continuous product innovation, some specications may change without notication.

AHU COMMUNICATIONS KIT INSTALLATION

DIP Switch Settings

Table 6: SW4 DIP Switch Settings for AHU Capacity

SW4 DIP switches

Capacity (kBTU/h)

MULTI V

5211

7512

9813

21424

51825

81636

42247

03848

63459

246701

846911

0651121

0743131

5835141

devreseR27151

devreseR29161

Single Zone

Switch

Number

Notes:

1. PAHCMS000 AHU can be connected to the PRLK048A0, PRLK096A0, or PRLK396A0 EEV kits only.

2. If connecting the PRLK396A0 EEV kit to a Multi V outdoor unit, set DIP switches 1, 2, 3, and 4 to ON

to set capacity to 192 kBtu/h.

13

Installation

Due to our policy of continuous product innovation, some specications may change without notication.

1

2

4

6

3

5

AHU COMMUNICATIONS KIT INSTALLATION

AHU Communications Kit Parts

Figure 5: AHU Communications Kit Parts Diagram.

Table 7: AHU Communications Kit Parts Table.

Diagram Label Part Name Quantity

1Thermistor Assembly, NTC Three (3)

2 Harness, Multi One (1)

3 Main Module One (1)

4 Communications Module One (1)

5 Bracket One (1)

6Panel Assembly, Control Three (3)

14

PRDCAM AHU Communication Kit Installation Manual

Due to our policy of continuous product innovation, some specications may change without notication.

1. Use the key to open the AHU Communication Kit door.

2. Remove the four nuts from the four captive bolts at the corners of the control panel assembly.

3. Carefully remove the control panel assembly from the AHU Communication Kit.

4. Use the AHU Communication Kit as a template and mark the locations of the screw holes on the mounting surface.

NOTE: Do not drill holes without removing the control panel assembly.

Metal shavings can collect on the control panel assembly and damage the equipment when power is applied�

5. Drill the four holes for the field-supplied screws. Ensure the drill bit does not damage any equipment or components.

6. Carefully replace the control panel assembly and secure with the four nuts on the four captive bolts.

7. Position the AHU Communications Kit at the mounting location and secure with four field-supplied screws. Ensure the screws

do not damage any equipment or components.

Figure 6: AHU Communications Kit Installation

AHU COMMUNICATIONS KIT INSTALLATION

AHU Communications Kit Mounting

Model

PAHCMS000 14 31/32 6-3/32 11-13/16 13-2/5 10-1/4

11/32 Holes (4)

BackFrontSide

Size (inch)

W D H A B

D W A

B

H

15

Installation

Due to our policy of continuous product innovation, some specications may change without notication.

AHU COMMUNICATIONS KIT INSTALLATION

Wiring Diagram

Figure 7: AHU Communications Kit Wiring Diagram

Thermistor

Return

16

PRDCAM AHU Communication Kit Installation Manual

Due to our policy of continuous product innovation, some specications may change without notication.

AHU COMMUNICATIONS KIT INSTALLATION

Wiring Diagram

*DI is available when Dip SW1-1 is Off

Name Port Value Electrical Spec Function

Short Open

On/Off DI1 On Off Non voltage Operation On/Off

Cool/Heat DI2 Heating Cooling Non voltage Operation Mode

Emer. Stop DI3 Emergency Stop Normal Non voltage Emergency Stop Input (Priority operation)

noitcnuF.cepSlacirtcelEeulaVtroPemaN

Alarm DO1 30 VDC / 5 A

250 VAC / 5 A

Output normal or error status (Relay C Contact)

- A Contact

Normal status : open

Error status : short

- B Contact

Normal status : short

Error status : open

-Normal Status

A B COM

-Error Status

A B COM

noitcnuF.cepSlacirtcelEmetItroPemaN

ODU Comm. RS485 CH2

ODU Comm.

(CEN A/B or

INT A/B)

Max 3280 ft,

2C x 18~16 AWG

(shield wire)

Communication with MULTI V/Single

split ODU for ODU Capacity control

LG

Central Comm. RS485 CH3 LG Central Comm.

Max 1640 ft,

2C x 18~16 AWG

(shield wire)

Communication with LG centralized

controller through LGAP Protocol

DDC Central

Comm. RS485 CH4 DDC(Modbus)

Central Comm.

Max 1640 ft,

2C x 18~16 AWG

(shield wire)

Communication with DDC central-

ized controller through Modbus pro-

tocol

Table 8: RS485 Communication Port

Table 9: Digital Input

Table 10: Digital Output – Relay C Contact

17

Installation

Due to our policy of continuous product innovation, some specications may change without notication.

AHU COMMUNICATIONS KIT INSTALLATION

Wiring Diagram

Name Port Value noitcnuF.cepSlacirtcelE

Short Open

On/Off DO2 On Off

12 VDC / 1 A,

250 VAC / 3 A

Operation On/Off status

sutatstsorfeDUDOlamroNtsorfeD3ODtsorfeD

sutatsffO/nOnoitareporosserpmoCffOnO4ODsutatS.pmoC

---5ODdevreseR

---6ODdevreseR

noitcnuF.cepSlacirtcelEeulaVtroPemaN

---1IUdevreseR

---2IUdevreseR

---3IUdevreseR

---4IUdevreseR

---5IUdevreseR

---6IUdevreseR

Capacity Control¹

0~10V

UI7

(AI) 0~10 V Input DC 0~10 V,

20 mA

ODU Capacity control input(0~10 V)

*When Temp. Control Type is ‘Manual by

DDC’(SW 1-2 : Off), refer to UI7 Analog Input

---8IUdevreseR

1. Refer to the Capacity Control (UI7) combination ratio table.

2. UI is available when Dip SW1-1 is Off

Table 11: Digital Output

Table 12: Universal Input

18

PRDCAM AHU Communication Kit Installation Manual

Due to our policy of continuous product innovation, some specications may change without notication.

Power Wiring

AHU COMMUNICATIONS KIT INSTALLATION

Figure 8: Power Wiring Connection.

General Power Wiring Guidelines

All electrical work must be performed by a licensed electrician and conform to local building codes or, in the absence of

local codes, with the National Electrical Code, and the instructions in this manual.

Inadequate power source capacity or improper electric work may result in re, electric shock, physical injury or death.

All eld-supplied parts, materials, and electric work must be conform to local codes.

Improper components and installation may result in re, electric shock, physical injury or death.

A main switch or disconnect, in accordance with relevant local and national codes, and having a contact separation in

all poles, must be incorporated in the wiring.

Improper installation by the user may result in re, electric shock, physical injury or death.

Refer to the air-source / water-source heat pump unit installation manual for power wiring sizes, circuit breaker and

switch capacities, and wiring instructions.

If the power source capacity for the air-source unit / water-source unit is inadequate or the electric work is not performed properly, it may result

in re, electric shock, physical injury or death.

Use copper wire only and connect wires tightly to the terminals. Install wiring so that other equipment is not obstructed.

Improper or incomplete connections could result in overheating, re, electric shock, physical injury or death.

Ensure the power source is disconnected before performing this procedure.

If the power source is connected during this procedure, it could result in electric shock, physical injury, or death�

1. Carefully pull the power cable through the cable nut and grommet.

2. Connect the power cable to the power terminal block.

3. Pull enough cable through the nut and grommet to allow enough slack for strain relief.

4. Tighten the cable nut.

Front View with Cover Open

Power Terminal Block

Cable

Insert

19

Installation

Due to our policy of continuous product innovation, some specications may change without notication.

AHU COMMUNICATIONS KIT INSTALLATION

Communications Wiring

• Communications wiring must be 18 gauge, shielded, and stranded�

• The thermistor cable, remote controller wires, and communications wires should be positioned at least two (2) inches away from pow-

er supply wires� If these wires are installed too closed together, it may result in product malfunction due to electrical interference�

All electrical work must be performed by a licensed electrician and conform to local building codes or, in the absence

of local codes, with the National Electrical Code, and the instructions in this manual.

If the electrical work is not performed properly, it may result in re, electric shock, physical injury or death.

All eld-supplied parts, materials, and electric work must be conform to local codes.

Improper components and installation may result in re, electric shock, physical injury or death.

Ensure the power source is disconnected before performing this procedure.

If the power source is connected during this procedure, it could result in electric shock, physical injury, or death�

1. Carefully pull the communications cable through the cable nut and grommet.

2. Refer to the wiring diagram in Figure 6 and connect the communications cable to the power terminal block.

3. Pull enough cable through the nut and grommet to allow enough slack for strain relief.

4. Tighten the cable nut.

Figure 9: Communications Wiring Connection

Comm Cable to:

• Single IDU, or

• DDC (RS485 Ch1), or

• Multi V IDU (RS485 Ch2)

Cable

Insert

Front View with Cover Open

20

PRDCAM AHU Communication Kit Installation Manual

Due to our policy of continuous product innovation, some specications may change without notication.

Controller Settings

AHU COMMUNICATIONS KIT INSTALLATION

Note : Dip SW 1-2 is for contact signal control

Note : Maintain previous value when getting intermediate value to UI4

Name Port Value Electrical

Spec. Function

Short Open

On / Off UI1 (DI) On Off Non voltage Operation On/Off Control

Cool / Heat UI2 (DI) Heating Cooling Non voltage

Heating/Cooling Operation Control

if operation mode (DIP SW 3-2, 3-3) is set to cooling only mode, UI2

“Short” status will work as fan mode.

if operation mode (DIP SW 3-2, 3-3) is set to heating only mode, UI2

“Open” status will work as fan mode.

Forced

Thermo

On / Off

UI3 (DI) Thermal

On

Thermal

Off Non voltage

When UI4(Target temp.) is less than 1.5 V, Target temp. and Room

temp. is fixed like below table

Target

Temp. UI4 (AI)

Voltage Electrical

Spec. Cooling Mode (°F)

V Min. Max

< 1.5 0 1.6

DC 0~10 V,

20 mA

UI3 short : 60

UI3 open : 80

UI3 short : 80

UI3 open : 60

06061.29.10.2

26266.24.25.2

46461.39.20.3

66666.34.35.3

86861.49.30.4

96966.44.45.4

17171.59.40.5

37376.54.55.5

57571.69.50.6

77776.64.65.6

87871.79.60.7

08086.74.75.7

28281.89.70.8

48486.84.85.8

68680.017.8≤0.9

Mode

UI3 status

Thermal On

Target temp. = 60

Room temp. = 80

Target temp. = 80

Room temp. = 60

Thermal Off

Target temp. = 80

Room temp. = 60

Target temp. = 60

Room temp. = 80

Heating Mode (°F)

Cooling Mode (°F) Heating Mode (°F)

Universal Input –UI Setting #1

UI setting #1 is available when DIP switches SW1-2, SW2-3, and SW2-4 are Off.

LG PAHCMS000 User manual

Popular Air Handler manuals by other brands