Panasonic Mva Series Air Handling Unit Service Manual IOM 1.0

2015-05-18

: Panasonic Panasonic-Mva-Series-Air-Handling-Unit-Service-Manual-730493 panasonic-mva-series-air-handling-unit-service-manual-730493 panasonic pdf

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035-000039-001 Page 1 of 38 MVA IOM 1.0 4-25-2014

MVA Series units are direct drive vertical

and multi-position Air Handlers delivering

nominal cooling capacities of 1.5 to 5 tons.

Units may be specified with hot water or elec-

tric heating coils to meet space cooling loads

or heating loads or both. Three return air con-

figurations are available for maximum flexibil-

ity.

How to Use this Manual:

This manual gives instructions regarding in-

stallation, operation and maintenance for the

MVA Series air handling units.

Use these instructions in conjunction with

other appropriate instructions, including but

not limited to those instructions supplied with

the outdoor unit. Installation must comply

with all applicable local codes.

GENERAL

Installation and maintenance are to be per-

formed only by qualified personnel who are fa-

miliar with local codes and regulations and are

experienced with HVAC equipment of this type.

WARNING: Sharp edges, coil surfaces

and rotating fans are a potential injury

hazard – avoid contact.

WARNING: Hazardous voltage – Discon-

nect and Lock Out all incoming power

sources before servicing or installing unit.

ELECTRIC SHOCK CAN CAUSE DEATH.

WARNING: This equipment may be in-

stalled well above finished floor—Use ex-

treme caution when working at heights.

SAFETY WARNING:

Installer should pay particular attention to

the following words:

NOTE–intended to clarify or make instal-

lation easier.

CAUTION–given to prevent equipment

damage.

WARNING–to alert installer that personal

injury and/or equipment damage may

result if installation procedure is not

properly followed.

UNPACKING-CHECK FOR DAMAGE!

Immediately inspect each unit for dam-

age upon receipt.

 Inspect units for external and concealed

damage immediately.

 File any damage claims in accordance

with the Freight Damage Policy and

Terms and Conditions.

 Do not repair damaged units without

written authorization.

 Protect stored units from damage.

MVA Series Air Handling Unit

Installation, Operation and Maintenance

Manual

035-000039-001 Page 2 of 38 MVA IOM 1.0 4-25-2014

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035-000039-001 Page 3 of 38 MVA IOM 1.0 4-25-2014

/ŶƐƚĂůůĂƟŽŶ͕ ^ƚĂƌƚ-Up

and Service

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MVA Series Air Handling Unit

Installation, Operation and Maintenance

Manual

Topic Page

SAFETY CONSIDERATIONS 1, 5

PRODUCT NOMENCLATURE 6-7

UNPACKING 8

INSTALLATION 8

Pre-installation 8

Rigging 8

Unpackaging 8

Service Clearances 8,11,12

Return Air & Unit Orientation 9

Vertical to Horizontal Conversion (EEV) 10

Unit Suspension or Floor Mount 8,13,14

Condensate Drain 13

Ductwork 13

Refrigerant Piping 15

Electric Heater Accessory 15-16

Electrical 17-23

START-UP 24-26

Fan Airflow Step-Up 24-25

Airflow Data 25-26

SERVICE 27-29

Fan & Fan Motor 27-28

Filters 29

Access Panels 29

Coil & Drain Pan Service 30

ELECTRICAL RATINGS 31

DIMENSIONS 32-35

Startup Report 37

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035-000039-001 Page 5 of 38 MVA IOM 1.0 4-25-2014

WARNING

CHECK the assembly and component weights to

be sure that the rigging equipment can handle

them safely.

Note also, the centers of gravity and any specific

rigging instructions.

CHECK for adequate ventilation so that fumes will

not migrate through ductwork to occupied spaces

when welding or cutting inside air-handling unit

cabinet or plenum.

WHEN STEAM CLEANING COILS be sure that

the area is clear of personnel.

DO NOT attempt to handle access covers and re-

movable panels on outdoor units when winds are

strong or gusting until you have sufficient help to

control them. Make sure panels are properly se-

cured while repairs are being made to a unit.

DO NOT remove access panel fasteners or open

access doors until fan is completely stopped. Pres-

sure developed by a moving fan can cause exces-

sive force against the panel which can injure per-

sonnel.

DO NOT work on dampers until their operators are

disconnected.

BE SURE that fans are properly grounded before

working on them.

Failure to follow these warnings could result in per-

sonal injury or equipment damage.

DANGER

NEVER enter an enclosed fan cabinet or reach into

a unit while the fan is running.

LOCK OPEN AND TAG the fan motor power dis-

connect switch before working on a fan. Take fuses

with you and note removal on tag. Electric shock

can cause personal injury or death.

LOCK OPEN AND TAG the electric heat coil power

disconnect switch before working on or near heat-

ers.

Failure to follow these warnings could lead to per-

sonal injury or death.

035-000039-001 Page 6 of 38 MVA IOM 1.0 4-25-2014

PRODUCT NOMENCLATURE

Unit Type/Size

Code Selection

01, 02 MV

Generation/Series

Code Selection

03 A

Unit Type/Size

Code Selection NOM Capacity

30 30,000 Btu/hr

Primary Coil Type

Code Selection

06 F4 ROW DX with electronic expansion valve, R-410a

Heating Coil

Code Selection

I19.5 kW - single phase w/circuit breaker only * 1 stage (size 42, 48, 60)

Notes: *

Future Use Description

Code Selection

08 A

1. Electric Heat KW rated at 230V. For 208V operation, derate heater to 75% of 230V rating.

2. Electric Heat complete with circuit breaker style power switch.

3. 14.5 and 19.5 kW shall have two supply circuits.

Future Use

Description

Electric Heat Ready (field installed kit - EH Top will be provided)*

3.0 kW - single phase w/circuit breaker only *1 stage (all sizes)

5.0 kW - single phase w/circuit breaker only * 1 stage (all sizes)

6.0 kW - single phase w/circuit breaker only * 1 stage (all sizes)

8.0 kW - single phase w/circuit breaker only * 1 stage (all sizes)

9.5 kW - single phase w/circuit breaker only * 1 stage (all sizes)

14.5 kW - single phase w/circuit breaker only * 1 stage (size 30 to 60)

04, 05

18,000 Btu/hr

24,000 Btu/hr

36,000 Btu/hr

60,000 Btu/hr

42,000 Btu/hr

48,000 Btu/hr

Revision Level

Description

Direct Drive Multiposition air handling unit

Description

035-000039-001 Page 7 of 38 MVA IOM 1.0 4-25-2014

Unit Grade Description

Code Selection

09 S

Unit Voltage

Code Selection

10 6

Controls

Code Selection

11 H

Return Air Cabinet Options

Ordering Number

Code Selection Return Location

BBottom Return

RRight Return

LLeft Return

TBottom Return

Drain Pan

Code Selection

Tracking Description

Code Selection

14 P

Vertical (Front RH Cond

Drain Cnx)

Unit Orientation

Horizontal Left or

Vertical (Front LH

Condensate Drain Cnx)

Panasonic

Note: Right return, horizontal orientation, or left hand condensate drain connections require

"Universal" drainpan selection. See code 13.

Description

drain pan and cabinet insulation type

Fiberglass, Universal Drainpan - Galvanized

Fiberglass, Universal Drainpan - Stainless Steel

Foil Face Fiberglass, Universal Drainpan - Galvanized

Foil Face Fiberglass, Universal Drainpan - Stainless Steel

Vertical (Front RH Cond

Drain Cnx) or Horizontal

Right

Vertical (Front LH Cond

Drain Cnx)

Description

208/230/1/60 ECM-VE (customer change transformer tap for 208V)

Description

Panasonic control board & low voltage interface

Standard

Description

PRODUCT NOMENCLATURE—CONT’D

035-000039-001 Page 8 of 38 MVA IOM 1.0 4-25-2014

Pre-installation

1. Check items received against packing list.

2. Do not stack unit components or accesso-

ries during storage. Stacking can cause

damage or deformation.

3. If unit is to be stored for more than 2 weeks

prior to installation, observe the following

precautions:

a. Choose a dry storage site that is rea-

sonably level and sturdy to prevent un-

due stress or permanent damage to the

unit structure or components. Do not

store unit on vibrating surface. Damage

to stationary bearings can occur. Set

unit off ground if in heavy rain area.

b. Remove all fasteners and other small

parts from jobsite to minimize theft. Tag

and store parts in a safe place until

needed.

c. Cover entire unit with a tarp or plastic

coverall. Extend cover under unit if

stored on ground. Secure cover with

adequate tie-downs or store indoors.

Be sure all coil connections have pro-

tective shipping caps.

d. Monthly — Remove tarp from unit, en-

ter fan section through access door or

through fan inlet, and rotate fan and

motor slowly by hand to redistribute the

bearing grease and to prevent bearing

corrosion.

Rigging — Do not remove shipping skids or

protective covering until unit is ready for final

placement. Use slings and spreader bars as ap-

plicable to lift unit. Do not lift unit by coil connec-

tions or headers.

Do not remove protective caps from coil

piping connections until ready to connect

piping.

WARNING-AUXILIARY DRAIN PAN

RECOMMMENDED:

This product has an auxiliary condensate drain

which should be piped to a condensate overflow

sensor or safe drain location or both to protect

the equipment and property from damage in the

case of condensate overflow.

In addition, the International Mechanical Code

(IMC) section 307.2.3 requires the use of auxil-

iary drain pans. Many municipalities have

adopted this code.

This practice represents the standard for profes-

sional installation whether or not this code has

been adopted in a specific municipality or terri-

tory. As such, water damages that would have

been prevented had an auxiliary pan been de-

ployed will not be considered for compensation.

This position is taken regardless of whether the

source of the moisture was specified as a po-

tential failure mode in the applicable building

code or not. A freeze burst, cracked drain pan,

failed weld, or corrosion induced leak are some

of the potential failure modes that are mitigated

when an auxiliary pan is properly installed. Pro-

fessional installers recognize the value of pro-

tecting customer assets against foreseeable

events. Customers who choose to avoid the

cost of common protective measures waive their

right to seek damages when those foreseeable

events occur. If the product is located above a

living space or where damage may result from

condensate overflow, install a watertight pan of

corrosion-resistant metal beneath the unit to

catch over-flow which may result from clogged

drains or from other reasons. Provide proper

drain piping for this auxiliary pan. Consult local

codes for additional precautions before installa-

tion.

Unpackaging

1. Remove all packaging and any foreign mate-

rial from unit.

2. Check blower wheel for free rotation.

3. Check copper lines, coil etc. for internal or

hidden damage.

Return Air and Unit Orientation

Units may be positioned in several configura-

tions depending on the return air configura-

tion selected—see Figure 1.

NOTE: Right and left return units are not

recommended for horizontal installation.

Service Clearance

The fan coil is completely serviceable from

the front. Units are approved for 0” (zero

INSTALLATION

inches) of clearance. This allows substan-

tial freedom in the positioning of the unit to

best serve the requirements of the struc-

ture.

Unit Support

Floor mounting: Unit may be mounted on a

housekeeping pad, floor, platform or plenum.

Provide a suitable isolation pad to minimize

sound transmission to the structure. CAU-

TION! Make sure to allow enough eleva-

tion to permit construction of the conden-

sate trap. Also allow enough elevation

and clearance for opening the filter door

(removes to the front). See Service Clear-

ances.

035-000039-001 Page 9 of 38 MVA IOM 1.0 4-25-2014

INSTALLATION

Figure 1

Return Configurations and

Unit Orientations

NOTE:

Electronic Expansion

Valve (EEV) must be ori-

ented vertically, and is

shipped for vertical cabi-

net orientation.

For horizontal cabinet

orientation, follow proce-

dure to rotate the EEV

assembly. Refer to Fig-

ure 2.

WARNING

FOR HORIZONTAL CABI-

NET ORIENTATION, EEV

MUST BE ROTATED TO

VERTICAL POSITION!

Failure to reorient the

EEV can result in im-

proper unit operation or

equipment damage or

dangerous condition.

035-000039-001 Page 10 of 38 MVA IOM 1.0 4-25-2014

INSTALLATION—VERTICAL TO HORIZON-

TAL CONVERSION—EEV ROTATION

WARNING

FOR HORIZONTAL CABINET

ORIENTATION, EEV MUST

BE ROTATED TO VERTICAL

POSITION! Failure to reori-

ent the EEV in VERTICAL

position can result in improp-

er unit operation or equip-

ment damage or dangerous

condition.

CONVERSION PROCEDURE:

1. UNIT IS SHIPPED WITH NITROGEN

CHARGE. IF UNIT HAS ALREADY BEEN

CHARGED WITH REFRIGERANT, REMOVE RE-

FRIGERANT CHARGE PER LOCAL CODES BE-

FORE PERFORMING CONVERSION PROCE-

DURE.

2. REMOVE PIPING PLUGS AND SAVE FOR LAT-

ER USE. NITROGEN WILL DISCHARGE FROM

COIL.

3. REMOVE PIPING GROMMETS; REMOVE LIQ-

UID INLET CAP FOR HORIZONTAL POSITION.

4. REMOVE BLOWER PANEL, LEFT AND RIGHT

COIL PANELS

5. SECURE EEV BRACKET WITH WRENCH AND

TURN COUPLING FLANGE NUT COUNTER

CLOCKWISE WITH 3/4" WRENCH TO LOOSEN

AND DISCONNECT COUPLING. THE COU-

PLING TAIL NUT SHOULD BE ALLOWED TO

TURN FREELY.

6. REPOSITION EXPANSION VALVE ASSEMBLY

AS SHOWN IN FIGURE 2d. ENSURE EXPAN-

SION VALVE IS VERTICAL WITHIN +/- 15 DEG

WITH UNIT INSTALLED IN HORIZONTAL POSI-

TION 7. REATTACH COUPLING AND

TIGHTEN TO 10-12 FT LBS

WHILE SECURING EEV BRACK-

ET WITH WRENCH.

8. AS AN ALTERNATIVE TO

STEP 5 COUPLING MAY BE

TIGHTENED UNTIL NO

THREADS ARE SHOWING

AND COUPLING IS BOT-

TOMED OUT. THEN TURN

AN ADDITIONAL 60 DEG

(OR ONE HEX FLAT) TO

TIGHTEN.

9. REINSTALL FRONT

PANELS, GROMMETS,

AND PIPING PLUGS.

Figure 2a-

Vertical

Orientation

Figure 2b-

Vertical

Orientation

Figure 2c-Vertical

Orientation, Panels

Removed

Figure 2d-Horizontal

Orientation

Detail A-

EEV Detail

EEV IN VERTICAL

ORIENTATION

EEV BRACKET

035-000039-001 Page 11 of 38 MVA IOM 1.0 4-25-2014

INSTALLATION—SERVICE CLEARANCES

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INSTALLATION—SERVICE CLEARANCES-

SIDE RETURN FILTER DETAILS

035-000039-001 Page 13 of 38 MVA IOM 1.0 4-25-2014

Install the unit so that it is level or pitches

slightly –(1/8 inch) – toward the condensate

drain connection.

Anchor the unit to the plenum or platform

through the bottom flange using 2ea #10 sheet

metal screws on each side (4 screws total).

Ceiling Suspension: Mount the unit in ceiling-

suspended horizontal orientation per suspen-

sion details (Figure 4). Unit is NOT intended

to be wall mounted. Consult a qualified struc-

tural engineer for special mounting considera-

tions.

Install the unit so that it pitches slightly –(1/8

inch) – toward the condensate drain connec-

tion.

Condensate Drain

Install a trapped condensate drain line at unit drain

connection. All MVA units have 3/4 in. FPT con-

densate main and auxiliary drain connections.

Provide adequate trap clearance (trap depth) be-

neath the unit as indicated in Fig. 3. Provide

freeze-up protection as required to insure reliable

condensate drainage. Freeze protection

measures are customer-supplied and installed.

Pipe to condensate drain using PVC or copper or

other suitable material. Pitch drain piping down-

ward at a minimum slope of 1/8 inch per foot.

Pipe auxiliary drain to “tell tale” drain location or

floor drain to clearly indicate when condensate

drain service is required. Alternately, use a field-

provided condensate overflow detection device in

the auxiliary drain connection to provide alarm or

other controls action when the drain pan fills to the

level of the auxiliary drain.

Placing Unit In Ductwork

1. Utilize flexible transitions on supply and return

connections to reduce noise and vibration trans-

mission to the structure.

INSTALLATION

WARNING

INSURE THAT THE UNIT IS ADE-

QUATELY SUPPORTED FROM

STRUCTURE TO PREVENT DAMAGE

OR INJURY CAUSED BY FALLING

EQUIPMENT! If uncertain about how

to connect to the structure, consult a

qualified structural engineer.

Fig. 3 — Condensate Drain

2. When the connecting return air duct is

smaller than the coil inlet opening, construct

the transition piece so that the vertical and

horizontal dimensions of the transition piece

do not increase more then one inch for eve-

ry seven inches of length of the transition

piece.

2. Provide at least three feet of straight

duct work preceding the unit inlet.

Duct Insulation and Vapor Proofing:

Properly select and install duct insulation as

required by the application.

All externally insulated duct work must have

an adequate vapor seal for summer opera-

tion. This is particularly important where the

duct is exposed to highly humid conditions

in such places as attics, vented crawl spac-

es, unconditioned basements, and utility

rooms. The vapor seal prevents condensa-

tion of moisture in the insulating material

and subsequent loss of its insulating value.

NOT TO SCALE

MAINTAIN THESE DIMENSIONS FOR ADEQUATE TRAP

SEAL:

A = 3.5” MINIMUM

B = 2.0” MINIMUM

NOTES:

1. CONDENSATE DRAIN PIPING RECOMMENDATIONS:

A. MINIMUM 3/4” Φ PIPE SIZE

B. COPPER OR PVC PIPE MATERIAL

C. USE DIELECTRIC UNION FOR DISSIMILAR METALS.

D. INSULATE PER PROJECT SPECIFICATIONS.

2. PAD OR PLENUM HEIGHT AS REQUIRED TO INSTALL

TRAP AND CONDENSATE DRAIN PIPING.

3. AVOID BLOCKING FILTER SERVICE ACCESS WHEN

INSTALLING CONDENSATE DRAIN PIPING.

035-000039-001 Page 14 of 38 MVA IOM 1.0 4-25-2014

Figure 4

CEILING SUSPENSION DETAILS

035-000039-001 Page 15 of 38 MVA IOM 1.0 4-25-2014

INSTALLATION

CAUTION

Direct-expansion coils are shipped pressurized

with dry nitrogen. Release pressure from the coil

through valves in protective caps before remov-

ing caps.

Do not leave piping open to the atmosphere un-

necessarily. Water and water vapor are detri-

mental to the refrigerant system. Until the piping

is complete, recap the system and charge with

nitrogen at the end of each workday. Clean all

piping connections before soldering joints.

Failure to follow these procedures could result in

personal injury or equipment damage.

Refrigerant Piping

Refrigerant Coils: Direct-expansion coils

have liquid and suction line connections

through the front of the cabinet. CAUTION:

Use proper care when brazing including use

of heat sink (wet cloth or other method) to pre-

vent damage to liquid line and suction line

components.

Size and install refrigerant lines in accordance

with the condensing unit manufacturer’s in-

structions. Provide insulation on the suction

line, to prevent condensation. Provide insula-

tion on the liquid line if unit to be used for heat

pump service or if otherwise required.

Electric Heater Accessory

The electric heater may be factory-installed or

field-installed. See Figures 5 through 8.

Removal Procedure:

To remove the electric heater,

1. Disconnect and lock out electrical power

from the unit. Remove heater access panel.

Disconnect power wires from the power

switch—DANGER! - MAKE SURE there is no

voltage on these wires before disconnecting!

2. Disconnect 2 harness connectors at the

blower deck.

3. Remove 2 screws holding heater support

feet to the blower deck.

4. Remove 4 screws that mount the heater to

the heater bulkhead. Handle heater carefully

to avoid damaging the wire heating elements.

Remove heater from the unit.

DANGER

WARNING: Hazardous voltage. Only qualified

personnel must install the electrical service. Dis-

connect and Lock Out all incoming power sources

before connecting to electrical service.

WARNING: This appliance must be permanently

grounded in accordance with the National Electrical

Code and local code requirements.

WARNING: For use with copper conductors only.

Fig. 5 — Heater Accessory Installed

(right side panel not shown)

Fig. 6 — Heater Accessory Installed

(right side and heater access panels

not shown)

035-000039-001 Page 16 of 38 MVA IOM 1.0 4-25-2014

INSTALLATION DANGER

WARNING: Hazardous voltage. Only qualified

personnel must install the electrical service. Dis-

connect and Lock Out all incoming power sources

before connecting to electrical service.

Install Procedure:

To install the electric heater,

1. Disconnect and lock out electrical power from

the unit. Remove heater access panel. Discon-

nect field power wires from the unit power wires.

DANGER! - MAKE SURE there is no voltage

supply to the unit before proceeding!

2. Disconnect and discard 1 harness connector at

the blower deck.

3. Remove blank plate from heater access panel

(covers square hole for breaker style power

switches).

4. Remove SAT sensor and sensor holder from

heater bulkhead and reposition on unit discharge

ductwork routing through auxiliary SAT sensor

hole on top panel.

5. Install SAT 3 feet after the first 90 degree turn

in the discharge ductwork.

6. Remove plate on the heater bulkhead (4

screws).

7. Install heater by carefully supporting the heater

and inserting it into the opening in the heater bulk-

head. NOTE: Make sure to guide the pin into the

hole at the back of the heater shroud. Secure the

heater to the bulkhead with 4 screws.

8. Connect 2 wiring harnesses (male) to the

matching female receptacles in the blower deck.

Fig. 7 — Heater Accessory Removal

(right side and heater access panels

not shown for clarity)

9. Connect field wiring to the breaker-style power

switches on the front of the heater. WARNING! Be

sure to provide the appropriate wire size and

branch circuit protection as required by the unit

nameplate!

10. Install the heater access panel.

11. Install the silicone cover “boot” over the top of

the power switches. This protects them from dust

buildup. The switches may be activated through the

flexible boot material.

12. Mark the nameplate label with the matching

heater kW rating. Label is located on the exterior of

the front top panel.

13. Update EEPROM settings to values shown in

the table. Refer to test run manual for detailed in-

structions for changing the EEPROM settings.

Fig. 8 — Heater

Accessory

Installed

HEATER

SHROUD

HEATER

ACCESS

PANEL

COVER

BOOT

HEATER

SHROUD

RIGHTSIDE

HEATER

ASSEMBLY

HEATER

BULKHEAD

POWER

SWITCH(ES)

Item Code New Settings

07 0001

38 0002

3C -001

035-000039-001 Page 17 of 38 MVA IOM 1.0 4-25-2014

Typical wiring diagrams are shown on the following

pages FOR REFERENCE. Always refer to the wir-

ing diagram on the air handling unit for actual wir-

ing.

NOTE: CHECK MOTOR RATING PLATE FOR

CORRECT LINE VOLTAGE.

Connect electrical service to unit. Refer to unit wir-

ing diagram.

Power Wiring

For power supply connection, route field power wir-

ing L1 and L2 and connect either:

1. Unit Without EH: to field-provided and installed

disconnect switch and from switch to power

entry (unit side) and to unit power leads inside

the unit electrical section; or

2. Unit With EH: into the unit through power entry

(unit side) and then to the factory installed pow-

er switch inside the electrical section (see Fig-

ure 9). Note: power switch looks like a circuit

breaker but does not provide overload pro-

tection. Power switch provided only with elec-

tric heater (field kit or factory installed). NOTE:

When electric heat greater than 10kW is pro-

vided, two power supply circuits are required,

as shown on the wiring diagram.

Refer to nameplate or Electrical Ratings (page 30)

for FLA, maximum overcurrent protection device

(MOPD) and minimum circuit ampacity (MCA). Also

refer to wiring diagram affixed to unit to make con-

trol and power wiring connections. For new heater

installation, mark the nameplate label with the

matching heater kW rating. Label is located on the

exterior of the front top panel.

NOTE: Installer is responsible for power wiring and

branch circuit over current protection.

Control Voltage Wiring

Control voltage wiring may enter the unit at the con-

trol box located behind the blower access door, or

DANGER

NEVER enter an enclosed fan cabinet or reach into

a unit while the fan is running.

LOCK OPEN AND TAG the fan motor power dis-

connect switch before working on a fan. Take fuses

with you and note removal on tag. Electric shock

can cause personal injury or death.

LOCK OPEN AND TAG the electric heat coil power

disconnect switch before working on or near heat-

ers.

Failure to follow these warnings could lead to per-

sonal injury or death.

DANGER

WARNING: Hazardous voltage. Only qualified

personnel must install the electrical service. Dis-

connect and Lock Out all incoming power sources

before connecting to electrical service.

WARNING: This appliance must be permanently

grounded in accordance with the National Electrical

Code and local code requirements.

WARNING: For use with copper conductors only.

INSTALLATION-ELECTRICAL

Figure 9

Unit with Electric Heat

CAUTION

Use only copper conductors for field-installed elec-

trical wiring. Unit terminals are not designed to

accept other types of conductors.

Do not allow wiring to touch the refrigerant tubing,

compressor, or any moving parts of the fan.

Make wiring connections in accordance with the

system wiring system diagram and these instruc-

tions. Wrong wiring may cause improper operation

or unit damage!

Unauthorized changes in the internal wiring can be

very dangerous. The manufacturer will accept no

responsibility for any damage or malfunction that

occurs as a result of such unauthorized changes.

other convenient location. Control voltage wiring

leads exit the bottom of the control box and are

ready for field-connection.

CAUTION! To prevent malfunction of the air condi-

tioner caused by electrical noise, route control wiring

and inter-unit control wiring SEPARATELY FROM

THE POWER WIRING!

POWER

SWITCH

035-000039-001 Page 18 of 38 MVA IOM 1.0 4-25-2014

DANGER

WARNING: Hazardous voltage. Only qualified

personnel must install the electrical service. Dis-

connect and Lock Out all incoming power sources

before connecting to electrical service.

WARNING: This appliance must be permanently

grounded in accordance with the National Electrical

Code and local code requirements.

WARNING: For use with copper conductors only.

INSTALLATION-ELECTRICAL

General

Provide strain relief where field wiring passes

through cabinet. Wiring within the cabinet has

been positively located and supported so that it

does not pass over sharp metal edges or come in

contact with moving parts. After servicing, position

wiring properly in the original supports.

All field-installed wiring, including the electrical

ground, MUST comply with the National Electrical

Code (NEC) as well as applicable local codes. In

addition, all field wiring must conform to the Class

II temperature limitations described in the NEC.

Refer to factory wiring diagrams installed in the

unit. Use the MCA and MOPD from the nameplate

or electric heat nameplate or Electrical Ratings

(page 30) to size power supply wiring and overcur-

rent protection device. Installation must comply

with NEC and local codes.

For communicating controls, refer to Figures 10

through 13 for max lengths, sizing and intercon-

nections. Refer to the condensing unit opera-

tion manual for more details.

Figure 10

Building System Wiring Diagram

(multiple indoor & outdoor units)

(A) Inter- unit (betwe en

outdoor a nd indoor units)

control wiring

(B) Re mote control wiring

AWG #18 (0.75 mm2) AWG #18 (0.75 mm2)

Max. 3,280 ft. Max. 1,640 ft.

control

(D) Inter- outdoor unit

control wiring

AWG #18 (0.75 mm2) AWG #18 (0.75 mm2)

Max. 650 ft. (Total) Max. 980 ft.

Control wiring

NOTE: See table below for wire requirements

for lines above marked “A”, “B”, “C” and “D”.

CAUTION

Loose wiring may cause the terminal to overheat

or result in unit malfunction or cause a fire hazard.

Insure that all wiring is tightly connected!

035-000039-001 Page 19 of 38 MVA IOM 1.0 4-25-2014

INSTALLATION-ELECTRICAL

Figure 11

Inter-Unit Control Wiring

Do not install the inter-unit control wiring

in a way that forms a loop.

Figure 12

Inter-Unit Control Wiring

Do not install inter-unit control wiring with splic-

es or “star branch” pattern. Star branch wiring

causes misaddress setting errors.

If branching the inter-unit control wiring,

the number of branch points should be

16 or fewer. (Branches less than 3.3 ft.

are not included in the total branch num-

ber.)

Figure 13

Branched Inter-Unit Control Wiring

035-000039-001 Page 20 of 38 MVA IOM 1.0 4-25-2014

INSTALLATION-ELECTRICAL (cont’d)

TYPICAL WIRING DIAGRAM—

Unit sizes 18 & 24

TYPICAL WIRING—MVA18, MVA24

035-000039-001 Page 21 of 38 MVA IOM 1.0 4-25-2014

INSTALLATION-ELECTRICAL (cont’d)

TYPICAL WIRING DIAGRAM—

Unit sizes 30, 36, 42, 48 & 60

TYPICAL WIRING—MVA30, MVA36,

MVA42, MVA48, MVA60

035-000039-001 Page 22 of 38 MVA IOM 1.0 4-25-2014

INSTALLATION-ELECTRICAL (cont’d)

TYPICAL WIRING—ELECTRIC HEAT

TYPICAL WIRING DIAGRAMS—

Electric Heat: 1-6kW and 8-9.5kW

TYPICAL WIRING—ELECTRIC HEAT

035-000039-001 Page 23 of 38 MVA IOM 1.0 4-25-2014

INSTALLATION-ELECTRICAL (cont’d)

TYPICAL WIRING—ELECTRIC HEAT

TYPICAL WIRING DIAGRAMS—

Electric Heat: 14.5kW and 19.5kW

TYPICAL WIRING—ELECTRIC HEAT

035-000039-001 Page 24 of 38 MVA IOM 1.0 4-25-2014

START-UP

Pre-Startup

Building Envelope—All building windows and doors should

be installed and closed before starting unit. During summer

construction, avoid unit sweating by allowing for gradual pull

down: use reduced capacity and use maximum available

airflow.

Temperature Controls-Check that unit is connected to the

controls system and communicating properly.

Outside Air and Freeze Protection

WARNING: Insure that the property is protected against

freezing conditions Failure to provide freeze protection

may result in property damage. Freeze protection

measures are customer-provided and installed and include

but are not limited to low-limit thermostats, automatic temper-

ature controls, and outside air dampers.

Startup

1. Insure electrical installation agrees with the unit name-

plate (voltage, branch circuit protection, wire size).

2. Close all panels and access doors. Make sure filter me-

dia is clean before starting unit. Replace filter if neces-

sary.

3. Verify that discharge ductwork and input plenum are in

place and secure.

4. Apply power to unit. If unit is equipped with on-board

power switch(es), turn switch(es) to the “On” position.

5. Insure that controls system has power and is operational.

6. Force control system to send fan on signal and speed

signal. Refer to unit wiring diagram and electrical section

for fan speed control arrangement.

7. Fan should start and run. Make sure fan operates with-

out significant noise or vibration.

8. Allow control system to start condensing unit, or as re-

quired for the installation.

9. Complete the checklist on the Start-Up Report.

10. Follow additional startup procedures for the system as

required by the condensing unit.

Fan Airflow Step-Up

If the duct system ESP is higher than planned and increased

Air Handler ESP is needed, shift the terminals as shown in

Figure 15.

Refer to Airflow tables and curves for airflow performance.

Fig. 14 — Fan Wheel Rotation—

FORWARD CURVED FAN