Premisys MP Series Manuale utente

Installation, Operation and Maintenance Manual

Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,

operate or maintain the product described. Protect yourself and others by observing all safety information. Failure

to comply with instructions could result in personal injury and/or property damage!

Packaged and Split Rooftop Ventilator

PremiSys

General Safety Information

WARNING

The roof lining contains high voltage wiring. To prevent

electrocution, do not puncture the interior or exterior

panels of the roof.

DANGER

• Always disconnect power before working on or near

this equipment. Lock and tag the disconnect switch or

breaker to prevent accidental power up.

• If this unit is equipped with optional gas accessories,

turn off gas supply whenever power is disconnected.

CAUTION

This unit is equipped with a compressed refrigerant

system. If a leak in the system should occur,

immediately evacuate the area. An EPA Certified

Technician must be engaged to make repairs or

corrections. Refrigerant leaks may also cause bodily

harm.

CAUTION

When servicing the unit, the internal components may

be hot enough to cause pain or injury. Allow time for

cooling before servicing.

Only qualied personnel should install and maintain this

system. Personnel should have a clear understanding of

these instructions and should be aware of general safety

precautions. Improper installation can result in electric

shock, possible injury due to coming in contact with

moving parts, as well as other potential hazards. Other

considerations may be required if high winds or seismic

activity are present. If more information is needed,

contact a licensed professional engineer before moving

forward.

1. Follow all local electrical and safety codes, as well as

the National Electrical Code (NEC), the National Fire

Protection Agency (NFPA), where applicable. Follow

the Canadian Electrical Code (CEC) in Canada.

2. All moving parts must be free to rotate without striking

or rubbing any stationary objects.

3. Unit must be securely and adequately grounded.

4. Do not spin wheel faster than maximum cataloged

fan RPM. Adjustments to fan speed signicantly

affect motor load. If the fan RPM is changed, the

motor current should be checked to make sure it is

not exceeding the motor nameplate amps.

5. Verify that the power source is compatible with the

equipment.

6. Never open access doors to the unit while it is

running.

Models MP/MPE (Packaged DX) Model MPF (Split DX)

Document 479650

Models MP, MPE and MPF

Packaged and Split Rooftop Ventilator

Premi

Sys

2Packaged and Split Rooftop Ventilator

Table of Contents

General Safety Information ....................1

Receiving, Handling, Storage...................3

Product Overview

Cooling ....................................4

Heating....................................4

Airflow Arrangement..........................4

Safety Listing ...............................4

Supplemental IOM Manuals....................4

Models and Capacities........................4

Subassemblies

Blower ....................................5

Coils ......................................5

Compressors ...............................5

Dampers...................................5

Electric Heater ..............................5

Filters .....................................5

Indirect Gas-Fired Furnace ....................5

Packaged DX System ........................5

Split DX System .............................5

Installation

Packaged DX Weights, Dimensions, Clearance ....6

Split DX Weights, Dimensions, Clearance.........7

Additional Clearances for Packaged DX ..........8

Handling Concerns for Units with Package DX .....8

Lifting .....................................8

Installation Site Requirements ..................8

Roof Curb Mounting..........................9

Ductwork Configurations ......................9

Rail Mounting and Layout .....................9

Electrical Information

Determine the Size of Main Power Lines ........10

Determine the Size of Electric Heater Wiring .....10

Opening(s) for the Electrical Connections ........10

Connect the Power Supplies ..................10

Wire the Optional Convenience Outlet ..........10

Connect Field-Wired Low Voltage Components ...10

Field-Provided Disconnect ....................10

Electrical/Gas Supply Entry Locations ...........11

Alternate Supply Entry Locations...............11

Indirect-Gas Piping Installation

Optional Gas Piping .........................11

Water Coil Piping Installation

Optional Coil Piping .........................12

Water Coils................................12

Condensate Drain Trap ......................12

Split DX Piping Installation

R410 PIping Material ........................13

Piping Design ...........................13-14

Refrigerant Charge Calculation ................15

Piping Connections .........................16

Control Center Components

Main Control Center.........................17

Optional Indirect Gas-Fired Furnace ............17

Component Operation

Phase Monitor .............................17

Variable Frequency Drive.....................17

Supply Fan VFD Sequence ...................17

Exhaust Fan Only Power .....................18

Airflow Monitoring ..........................18

Factory-Installed Refrigeration Systems

Packaged DX ..............................19

Split DX ..................................20

Electrical Parts Specification ................21

Component Operation......................21

Start-Up – Unit

Model and Serial Number ....................22

Pre-Start-Up Checklist .......................23

Special Tools Required ......................23

Start-Up Procedure .........................23

Voltage Imbalance ..........................23

Start-Up Checklist ..........................23

Start-Up – Components

Fan ......................................25

Supply Fan (Plenum Type) ...................25

Fan Wheel Rotation Direction .................25

Supply/Exhaust Fan .........................25

Vibration ..................................25

Discharge Air Temperature Sensor .............25

Airflow Monitor .............................26

Optional Energy Wheel

Start-Up ..................................27

Drive Belt .................................27

Adjust the Air Seals .........................27

Sequence of Operation ......................27

Maintenance...............................28

Inspection.................................28

Wheel Disassembly .........................28

Cleaning ..................................28

Reassembly ...............................28

Energy Recovery Wheel Belt ..................28

Energy Recovery Wheel Bearings ..............28

Energy Recovery Wheel - Troubleshooting .......29

Troubleshooting

Alarms

Microprocessor Controller ..................29

Phase Monitor............................29

Variable Frequency Drive ...................29

Optional FX05 Furnace Controller ............29

Optional Digital Scroll Compressor Controller ...29

Unit......................................30

Refrigeration Circuit

Packaged ............................31-34

Split .................................35-37

Routine Maintenance

Monthly...................................38

Semiannually ..............................38

Annually ..................................38

Units with Packaged DX, Semiannually..........38

Maintenance Procedures

Lubrication ................................39

Dampers..................................39

Gas Furnace ..............................39

Fan Motors ................................39

Fan Wheel and Fasteners ....................39

Internal Filter Maintenance ...................39

External Filter Maintenance ...................39

Coil Maintenance ...........................39

Maintenance Log ..................... Backcover

PremiSys

Packaged and Split Rooftop Ventilator

Receiving

This product may have been subject to road salt during

transit. If so, immediately wash off all visible white

reside from all exterior surfaces. Upon receiving the

product, check to ensure all line items are accounted

for by referencing the delivery receipt or packing list.

Inspect each crate or carton for shipping damage before

accepting delivery. Alert the carrier if any damage is

detected, do not refuse shipment. The customer shall

make notation of damage (or shortage of items) on the

delivery receipt and all copies of the bill of lading should

be countersigned by the delivering carrier. If damaged,

immediately contact your manufacturer’s representative.

Any physical damage to the unit after acceptance is not

the responsibility of the manufacturer.

Handling

Units are to be rigged and moved by the lifting brackets

provided or by the skid when a forklift is used. Location

of brackets varies by model and size. Handle in such

a manner as to keep from scratching or chipping the

coating. Damaged nish may reduce ability of unit to

resist corrosion.

Unpacking

Verify that all required parts and the correct quantity

of each item have been received. If any items are

missing, report shortages to your local representative to

arrange for obtaining missing parts. Sometimes it is not

possible that all items for the unit be shipped together

due to availability of transportation and truck space.

Conrmation of shipment(s) must be limited to only items

on the bill of lading.

Storage

Units are protected against damage during shipment. If

the unit cannot be installed and operated immediately,

precautions need to be taken to prevent deterioration of

the unit during storage. The user assumes responsibility

of the unit and accessories while in storage. The

manufacturer will not be responsible for damage during

storage. These suggestions are provided solely as a

convenience to the user.

The ideal environment for the storage of units and

accessories is indoors, above grade, in a low humidity

atmosphere which is sealed to prevent the entry of

blowing dust, rain, or snow. Units designed for outdoor

applications may be stored outdoors. All accessories

must be stored indoors in a clean, dry atmosphere.

Indoor

Maintain temperatures evenly to prevent condensation.

Remove any accumulations of dirt, water, ice, or snow

and wipe dry before moving to indoor storage. To

avoid condensation, allow cold parts to reach room

temperature. Leave coverings loose to permit air

circulation and to allow for periodic inspection.

The unit should be stored at least 3½ in. (89 mm) off

the oor. Clearance should be provided to permit air

circulation and space for inspection.

Outdoor

The unit should be placed on a level surface to prevent

water from leaking into the unit. The unit should be

elevated so that it is above water and snow levels.

Ensure sufcient support to prevent unit from settling into

soft ground. Locate parts far enough apart to permit air

circulation, sunlight, and space for periodic inspection.

To minimize water accumulation, place all unit parts on

blocking supports so that rain water will run off.

Do not cover parts with plastic lm or tarps as these

cause condensation of moisture from the air passing

through heating and cooling cycles.

Inspection and Maintenance

While in storage, inspect units once per month. Keep a

record of inspection and maintenance performed.

If moisture or dirt accumulations are found on parts,

the source should be located and eliminated. At each

inspection, rotate the fan wheel by hand ten to fteen

revolutions to distribute lubricant on motor. If paint

deterioration begins, consideration should be given to

touch-up or repainting. Units with special coatings may

require special techniques for touch-up or repair.

Machined parts coated with rust preventive should be

restored to good condition promptly if signs of rust occur.

Immediately remove the original rust preventive coating

with petroleum solvent and clean with lint-free cloths.

Polish any remaining rust from surface with crocus

cloth or ne emery paper and oil. Do not destroy the

continuity of the surfaces. Wipe thoroughly clean with

Tectyl®506 (Ashland Inc.) or the equivalent. For hard to

reach internal surfaces or for occasional use, consider

using Tectyl®511M Rust Preventive, WD-40®or the

equivalent.

Removing from Storage

As units are removed from storage to be installed in their

nal location, they should be protected and maintained in

a similar fashion until the equipment goes into operation.

Prior to installing the unit and system components,

inspect the unit assembly to make sure it is in working

order.

1. Check all fasteners, set screws on the fan, wheel,

bearings, drive, motor base, and accessories for

tightness.

2. Rotate the fan wheel(s) by hand and assure no parts

are rubbing.

PremiSys

4Packaged and Split Rooftop Ventilator

Product Overview

A horizontally congured Dedicated Outdoor Air unit

designed for installation outdoors. The unit is designed

to replace air that is exhausted from the building and

also heat and cool, as needed. The air volume produced

by the unit is constant, but can be optionally modulated

to provide a variable air volume (VAV).

Cooling

Units have the following cooling options available:

• Packaged DX

• Split DX

Units with packaged DX are shipped fully charged with

refrigerant and are ready for operation upon arrival.

Heating

There are three different optional heat sources that can

be ordered for this unit:

• Indirect gas-red furnace with one or two sets of

heat exchangers

• Electric heat with innitely variable SCR control

• Hot water coil (Installed in furnace section)

Airow Arrangement

The unit is capable of Constant Air Volume (CAV),

Variable Air Volume (VAV), 100% Outdoor Air.

Safety Listing

Models are listed per ANSI/UL 1995, Heating and

Cooling Equipment and are ETL Certied.

Models and Capacities

Model Cooling Capacity

Packaged DX

MP-1-1/MPE-1-1 5 to 15 tons

MP-2-1/MPE-2-1 15 to 30 tons

MP-4-0/MPE-4-0 20 to 45 tons

Split DX

MPF-1-1 5 to 12 tons

MPF-2-1 10 to 20 tons

Supplemental Installation, Operation and

Maintenance Manuals

Refer to the following Manufacturer Installation,

Operation and Maintenance Manuals for additional

information:

• Indirect Gas-Fired Heat Modules

• Microprocessor Controller

• M-Net Connection

For information on Service and installation Operation

manual please refer to the manuals in the Outdoor

equipment.

• PUHY-P96T/YKMU

• PUHY-P144T/YKMU

• PUHY-P192T/YSKMU

• PUHY-P240T/YSKMU

PremiSys

Packaged and Split Rooftop Ventilator

Subassemblies

Blower

Either one or two plenum-type fans. All units are

equipped with a plenum fan for Supply Air and a second

may be selected for Exhaust (Relief) Air.

Coils (Packaged)

Evaporator coil

Condenser coil

Hot Water coil (Optional)

Reheat coil (Optional)

Coils (Split)

Evaporator coil

Hot Water coil (Optional)

Reheat coil

Compressors

Each unit having packaged DX will have either one

or two refrigerant compressors. Optionally, one the

compressors may be a digital scroll type compressor.

Optional inverter scroll compressors on Split DX system

only.

Dampers

Motorized intake air damper.

Electric Heater

An SCR controlled electric heater (not shown) is

available on the units. It requires a separate power

supply and has its own control panel. See unit-specic

wiring diagram.

Plenum-Type

Supply Air Blower

Indirect Gas-Fired Furnace

(optional)

Intake Air

Damper

Coils

Open view of Model MPF showing split DX cooling, fans and energy recovery wheel.

Main Control

Center

Final Filters

(on coil face) Weatherhood Filters

(metal mesh)

Energy Wheel (MPF)

Plenum-Type

Exhaust Air Blower

Filters

Two-inch thick metal mesh lters in the optional Outdoor

Weatherhood air intake, 2-inch thick pleated paper

MERV 8 (standard) or MERV 13 (optional) lters in the

airstream. Optional 4-inch thick lter bank with 2-inch

thick MERV 8 and 2-inch thick MERV 13 pleated paper

Final Filters.

Indirect Gas-Fired Furnace

The optional model PVG furnace is available on housing

sizes 1 and 2. Housing size 4 uses the optional model

PVF furnace.

Packaged DX System

Unit may be ordered with a packaged DX system.

It will include either one or two compressors, a

condenser coil(s) and evaporator coil(s) and all needed

components. Units that have packaged DX are charged

with R-410A refrigerant. Do not use tools or parts

designed for other refrigerants on these units.

Split DX System

Unit may be ordered with a split DX system for

connection to a Mitsubishi Outdoor Unit. All MPF models

are standard with split DX cooling and the energy wheel.

PremiSys

6Packaged and Split Rooftop Ventilator

Installation - Packaged DX

Service Clearances

Unit

Size

A L W J* H

Unit

Weight

Outdoor

Air WH Qty

Pre-Wheel

Supply/

Exhaust

Filters*

Qty

Supply Final

Filters

(Pre-coil)**

Qty

Outdoor

Air

Length Width Condensing

Section Height

MP-1-1 22.1 98.6 52.5 30.1 59.3 2700 20x20x2 4

20x20x2 4

MP-2-1 27.1 109 68.2 30.1 72.5 4500 25x25x2 4 16x25x2 8

MP-4-0 22 156 68 30 90 6400 20x25x2 6 16x20x2 12

MP-4-0^22 156 68 30 90 6400 20x25x2 6 16x20x2 12

MPE-1-1 22.1 149.5 52.5 30.1 59.3 3400 20x20x2 4 20x25x2†2†20x20x2 4

MPE-2-1 27.1 163.2 68.2 30.1 72.5 5100 25x25x2 4 16x25x2‡4‡16x25x2 8

MPE-4-0 22 224 68 30 90 8300 20x25x2 6 16x20x2#7#16x20x2 12

MPE-4-0^27 224 68 30 90 8300 25x25x2 6 20x20x2/

20x24x2 8 16x20x2 12

All dimensions are shown in inches. Weight shown in pounds. *Size and quantity is per airstream. **Dimension based upon

MERV 8 or 13 lters (MERV 14 lters are 4 in. thick).†Based upon a 30 / 36 in. energy wheel (16x25x2, quantity of 3 for 41 in.

energy wheel). ‡Based upon a 52 in. energy wheel (16x16x2, quantity of 8 for 58 in. energy wheel). #Based upon a 52 / 58 in.

energy wheel (16x20x2, quantity of 8 for 74 in. energy wheel). ^Above 12,000 cfm. WH = weatherhood (aluminum mesh). Model

MPE includes energy wheel (not shown).

Unit Size ACS CC

End

CS from

Unit

MP-1-1/MPE-1-1 40 42 42 18

MP-2-1/MPE-2-1 36 58 42 18

MP-4-0/MPE-4-0 36 52 58 18

All dimensions are shown in inches.

ACS = Access

CC = Control Center

OA = Outdoor Air Weatherhood

CS = condensing section

Typical Unit Weights and Dimensions

OA End

ACS

CC End

CLEARANCE

Inlet/Discharge Locations

Unit Size RA1 RA2 RA3 RA4 SB1 SB2 SB3 SB4 SS1 SS2 SS3 SS4

MP-1-1, MPE-1-1 41 5.8 5.6, 56.6 11.5 28 14 22 24 21 6.5 22 25

MP-2-1, MPE-2-1 56 6.1 5.9, 60.2 16 53 7.6 23.2 27 21 6.5 22.2 29

MP-4-0, MPE-4-0 48.8 9.6 9, 77 21.8 42 13 37.7 36 32 6.4 45.2 32

OUTDOOR AIR

WEATHERHOOD

SUPPLY AIR

DISCHARGE BOTTOM

RECIRC

DAMPER

OUTDOOR AIR

DAMPER SUPPLY BLOWER

COMPRESSORS

CONTROL

CENTER

IG HEATER

SUPPLY FILTERS

SB1

SB2

SB4 SB3RA3

RA4

RA2

RA1

SS1

SS2

SS3SS4

RETURN AIR INLET

DX COIL

SUPPLY AIR

DISCHARGE SIDE

PremiSys

Packaged and Split Rooftop Ventilator

Installation - Split DX

RA1

OUTDOOR AIR DAMPER

SUPPLY BLOWER

EXHAUST AIR

DISCHARGE

RETURN AIR INLET

DX COIL

HGRH COIL

SUPPLY FINAL FILTERS

SUPPLY FILTERS

ENERGY WHEEL

EXHAUST FILTERS SUPPLY AIR

DISCHARGE BOTTOM SUPPLY AIR

DISCHARGE SIDE

INDIRECT GAS HEATER

OUTDOOR AIR

WEATHERHOOD

RA2

RA3 RA4 SB4 SB3

SB1

SB2

CONTROL

CENTER

EXHAUST BLOWER

SS2

SS1

SS3SS4

EXHAUST DISCHARGE

WEATHERHOOD

Service Clearances

Unit

Size

A L W H

Unit

Weight

Outdoor

Air WH Qty

Pre-

Wheel

Supply/

Exhaust

Filters*

Qty

Supply

Final

Filters

(Pre-coil)

Qty

Outdoor

Air

Length Width Height

MPF-1-1 22.1 149.5 52.5 59.3 2400 20x20x2 420x25x2†2†20x20x2 4

MPF-2-1 27.1 163.2 68.2 72.5 5100 25x25x2 16x25x2‡4‡16x25x2 8

All dimensions are shown in inches. Weight shown in pounds. *Size and quantity is per airstream. †Based upon a 30 / 36 in.

energy wheel (16x25x2, quantity of 3 for 41 in. energy wheel). ‡ Based upon a 52 in. energy wheel (16x16x2, quantity of 8 for 58

in. energy wheel). WH = weatherhood (aluminum mesh).

Unit Size ACS CC End OA End *PA from Unit

MPF-1-1 36 32 42 24

MPF-2-1 36 58 42 24

All dimensions are shown in inches. *PA from Unit = piping access

ACS = Access

CC = Control Center

PA = Piping Access

OA = Outdoor Air Weatherhood

Typical Unit Weights and Dimensions

OA End

ACS

CC End

CLEARANCE

Inlet/Discharge Locations

Unit Size R1 R2 R3 R4 SB1 SB2 SB3 SB4 SS1 SS2 SS3 SS4

MPF-1-1 41 5.8 5.6 11.5 28 14 22 24 21 6.5 22 25

MPF-2-1 56 6.1 5.9 16 53 7.6 23.2 27 21 6.5 22.2 29

PremiSys

8Packaged and Split Rooftop Ventilator

Handling Concerns for Units with Packaged

Units having packaged DX have a system that is

pressurized with refrigerant and if it is damaged, the

refrigerant could leak into the atmosphere or cause

bodily harm due to the extreme cold nature of expanding

refrigerant. Use protective equipment such as gloves

and safety glasses to minimize or prevent injury in case

of a system leak during installation.

Before Lifting - Field Power Access

Determine where high voltage and low voltage wiring is

to be brought into the cabinet. If wiring is to be brought

into the cabinet through the oor, see Alternate Supply

Entry Locations in this manual. If unit is to be installed on

a roof, cut access openings in the roof deck as needed.

Lifting

1. Before lifting, be sure that all shipping materials have

been removed from unit.

2. To assist in determining rigging requirements, weights

are provided in the Unit Weights & Dimensions

section of this manual.

3. Unit must be lifted by all lifting lugs provided at top of

unit.

4. Spreader bars must span the unit to prevent damage

to the cabinet by the lift cables.

5. Always test-lift the unit to check for proper balance

and rigging before hoisting to desired location.

6. Never lift unit by weatherhood.

7. Never lift units in windy conditions.

8. Preparation of curb and roof openings should be

completed prior to lifting unit to the roof.

9. Check to be sure that gasketing (supplied by others)

has been applied to the top of the curb prior to lifting

the unit and setting on the curb.

10.Do not use fork lifts for handling unit.

Use spreader bars to prevent damage to cabinet.

Additional Clearances for

Packaged DX Units

Packaged DX units require additional clearance

because they must have unrestricted air movement

around the condenser coil and condenser fans. Hot air

is being discharged from the condenser fans during

operation. Enough clearance must be provided to

avoid recirculation or coil starvation. When equipped

with condenser coils, the unit should never be placed

under an overhang or inside a building. A minimum of

48 inches above the condenser fans is acceptable, but

unobstructed is strongly recommended.

END VIEW OF MAKE-UP AIR UNIT

WITH PACKAGED DX

Minimum 48 inches clearance

Minimum 18 inches

clearance

Condenser Coil

Condenser Fans

End view of roof top unit with Packaged DX

PremiSys

Packaged and Split Rooftop Ventilator

Roof Curb Mounting

Roof curb details, including duct locations and

dimensions, are to be found in the roof curb assembly

instructions.

Rooftop units require curbs to be mounted rst. The

duct connections must be located so they will be clear of

structural members of the building.

1. Factory Supplied Roof Curbs

Roof curbs are Model GKD which are shipped in a

knockdown kit (includes duct adapters) and require eld

assembly (by others). Assembly instructions are included

with the curb kit.

2. Install Curb

Locate curb over roof opening and fasten in place.

Check that the diagonal dimensions are within ± 1/8

inch of each other and adjust as necessary. For proper

coil drainage and unit operation, it is important that the

installation be level. Shim the curb as required to level.

Install gasketing on top surface of curb (provided by

others).

3. Install Ductwork

Installation of all ducts should be done in accordance

with SMACNA and AMCA guidelines. Duct adapters are

provided to support ducts prior to setting the unit.

4. Set the Unit

Lift unit to a point directly above the curb and duct

openings. Guide unit while lowering to align with duct

openings. Roof curbs t inside the unit base. Make sure

the unit is properly seated on the curb and level.

Typical Unit with Condensing Section and

Factory-Supplied Curb Kit

Ductwork Congurations

NOTE

Downblast Discharge Ductwork - whenever

downblast discharge is used, the ductwork directly

beneath the unit must be connected with either a “T”

or an “L” configuration and the area directly beneath

the heat source must not have any openings such as

louvers or grates.

No louvers or grates

Typical Unit Installed on Rails Supplied by Others

Rail Mounting and Layout

• The units may be installed on rails provided and

installed by others. Ensure that rails are designed to

handle the weight of the unit and provide proper load

distribution on building supports.

• Make sure that rail positioning does not interfere with

the openings on the unit.

• Rails should run the width of the unit and extend

beyond the unit a minimum of 12 inches on each

side.

• Set unit on rails.

PremiSys

10 Packaged and Split Rooftop Ventilator

WARNING

The roof lining contains high voltage wiring. To prevent

electrocution, do not puncture the interior or exterior

panels of the roof.

WARNING

To prevent injury or death due to electrocution or

contact with moving parts, lock disconnect switch open.

For units with a gas furnace, if you turn off the power

supply, turn off the gas.

IMPORTANT

Before connecting power to the unit, read and

understand the following instructions and wiring

diagrams. Complete wiring diagrams are attached on

the inside of the control center door(s).

IMPORTANT

All wiring should be done in accordance with the latest

edition of the National Electric Code ANSI/NFPA 70

and any local codes that may apply. In Canada, wiring

should be done in accordance with the Canadian

Electrical Code.

IMPORTANT

The equipment must be properly grounded and

bonded. Any wiring running through the unit in the

airstream must be protected by metal conduit, metal

clad cable or raceways.

CAUTION

If replacement wire is required, it must have a

temperature rating of at least 105ºC, except for an

energy cut-off or sensor lead wire which must be rated

to 150ºC.

DANGER

High voltage electrical input is needed for this

equipment. This work should be performed by a

qualified electrician.

CAUTION

Any wiring deviations may result in personal injury

or property damage. Manufacturer is not responsible

for any damage to, or failure of the unit caused by

incorrect final wiring.

Electrical Information Determine the Size of the Main Power Lines

The unit’s nameplate, located on the outside of the

control panel side, states the voltage and the unit’s

MCA. The main power lines to the unit should be sized

accordingly. Model MPF is provided with a separate

condensing unit with its own disconnect that requires a

separate power feed from the unit.

Determine the Size of Electric Heater Wiring

An optional electric heater may require a separate power

supply. The power connection should be made to the

factory-provided electric heater disconnect and must be

compatible with the ratings on the nameplate, supply

power voltage, phase and amperage. Consult ANSI/

NFPA 70 and CSA C22.1 for proper conductor sizing.

Provide the Opening(s) for the Electrical

Connections

Electrical openings vary by unit size and arrangement

and are eld-supplied.

Connect the Power Supplies

Connect the main power lines and electric heater power

lines to the disconnect switches or terminal blocks and main

grounding lug(s). Torque eld connections to manufacturer’s

recommendations.

Wire the Optional Convenience Outlet

The convenience outlet requires a separate 115V power

supply circuit. The circuit must include short circuit

protection which may need to be supplied by others.

Connect Field-Wired Low Voltage

Components

Most factory-supplied electrical components are

prewired. To determine what electrical accessories

require additional eld-wiring, refer to the unit-specic

wiring diagram located on the inside of the control center

access door.

Control wires should not be run inside the same conduit

as that carrying the supply power. Make sure that eld-

supplied conduit does not interfere with access panel

operation. All low voltage wiring should be run in conduit

wherever it may be exposed to the weather.

The low voltage control circuit is 24 VAC and control

wiring should not exceed 0.75 ohms. If wire resistance

exceeds 0.75 ohms, an industrial-style, plug-in relay

should be added to the unit control center and wired in

place of the remote switch (typically between terminal

blocks R and G on the terminal strip. The relay must

be rated for at least 5 amps and have a 24 VAC coil.

Failure to comply with these guidelines may cause

motor starters to “chatter” or not pull in which can cause

contactor failures and/or motor failures.

Field-Provided Disconnect

If eld-installing an additional disconnect switch, it

is recommended that there is at least four feet of

service room between the switch and system access

panels. When providing or replacing fuses in a fusible

disconnect, use dual element time delay fuses and size

according to the rating plate.

WARNING

Consult your dealer when the following issues on Y

system are the key concern.

• Warm air may flow out from the indoor unit during

heating Thermo-OFF.

• Refrigerant flow sound may occur in the rooms

with low background noise such as hotel rooms,

hospital rooms, bedrooms, or conference rooms.

To avoid the above issues on Y system, changing

board settings on the indoor and outdoor units is

required.

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