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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MVA Series Air Handling Unit
Installation, Operation and Maintenance
Manual

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 electric heating coils to meet space cooling loads
or heating loads or both. Three return air configurations are available for maximum flexibility.

How to Use this Manual:
This manual gives instructions regarding installation, 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 performed only by qualified personnel who are familiar 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 – Disconnect and Lock Out all incoming power
sources before servicing or installing unit.
ELECTRIC SHOCK CAN CAUSE DEATH.
WARNING: This equipment may be installed well above finished floor—Use extreme caution when working at heights.
UNPACKING-CHECK FOR DAMAGE!

SAFETY WARNING:
Installer should pay particular attention to
the following words:
NOTE–intended to clarify or make installation 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.

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Immediately inspect each unit for damage 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.

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MVA Series Air Handling Unit
Installation, Operation and Maintenance
Manual

/ŶƐƚĂůůĂƟŽŶ͕ ^ƚĂƌƚ-Up
and Service
/ŶƐƚƌƵĐƟŽŶƐ
Topic

Page

SAFETY CONSIDERATIONS
PRODUCT NOMENCLATURE

1, 5
6-7
8
8
8
8
8
8,11,12
9
10
8,13,14
13
13
15
15-16
17-23
24-26
24-25
25-26
27-29
27-28
29
29
30
31
32-35
37

UNPACKING
INSTALLATION
Pre-installation
Rigging
Unpackaging
Service Clearances
Return Air & Unit Orientation
Vertical to Horizontal Conversion (EEV)
Unit Suspension or Floor Mount
Condensate Drain
Ductwork
Refrigerant Piping
Electric Heater Accessory
Electrical
START-UP
Fan Airflow Step-Up
Airflow Data
SERVICE
Fan & Fan Motor
Filters
Access Panels
Coil & Drain Pan Service
ELECTRICAL RATINGS
DIMENSIONS
Startup Report

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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 removable panels on outdoor units when winds are
strong or gusting until you have sufficient help to
control them. Make sure panels are properly secured while repairs are being made to a unit.
DO NOT remove access panel fasteners or open
access doors until fan is completely stopped. Pressure developed by a moving fan can cause excessive force against the panel which can injure personnel.
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 personal injury or equipment damage.

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PRODUCT NOMENCLATURE

Unit Type/Size
Code

Selection

01, 02

Generation/Series
Code

Selection

Unit Type/Size
Code

Description
Revision Level
Description

18,000 Btu/hr

24,000 Btu/hr

30,000 Btu/hr

36,000 Btu/hr

42,000 Btu/hr

48,000 Btu/hr

60,000 Btu/hr

Primary Coil Type
Selection

Heating Coil
Code

Direct Drive Multiposition air handling unit

Selection NOM Capacity

04, 05

Code

Description

Selection
B

Description
4 ROW DX with electronic expansion valve, R-410a

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)

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

Notes: *
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
Code
08

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Description

Selection
A

Future Use

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PRODUCT NOMENCLATURE—CONT’D

Unit Grade
Code

Description

Selection

Unit Voltage
Code

Description

Selection

Controls
Code

Standard

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

Selection

Panasonic control board & low voltage interface

Return Air Cabinet Options
Ordering Number Description
Code

Selection Unit Orientation Return Location

Vertical (Fro nt RH Co nd
Drain Cnx) o r Ho rizo ntal
Right

Bottom Return

Vertical (Fro nt LH Co nd
Drain Cnx)

Right Return

Vertical (Fro nt RH Co nd
Drain Cnx)

Left Return

Ho rizo ntal Left o r
Vertical (Fro nt LH
Co ndensate Drain Cnx)

Bottom Return

Note: Right return, horizontal orientation, or left hand condensate drain connections require
"Universal" drainpan selection. See code 13.
Drain Pan
Code

Description

Selection drain pan and cabinet insulation type
C
D
G
H

Tracking
Code
14

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Fiberglass, Universal Drainpan - Galvanized
Fiberglass, Universal Drainpan - Stainless Steel
Foil Face Fiberglass, Universal Drainpan - Galvanized
Foil Face Fiberglass, Universal Drainpan - Stainless Steel
Description

Selection
P

Panasonic

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INSTALLATION

Pre-installation
1. Check items received against packing list.
2. Do not stack unit components or accessories 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 reasonably level and sturdy to prevent undue 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 protective shipping caps.
d. Monthly — Remove tarp from unit, enter 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 applicable to lift unit. Do not lift unit by coil connections or headers.
Do not remove protective caps from coil
piping connections until ready to connect
piping.
Unpackaging
1. Remove all packaging and any foreign material 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 configurations depending on the return air configuration 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
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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 auxiliary drain pans.
Many municipalities have
adopted this code.
This practice represents the standard for professional installation whether or not this code has
been adopted in a specific municipality or territory. As such, water damages that would have
been prevented had an auxiliary pan been deployed will not be considered for compensation.
This position is taken regardless of whether the
source of the moisture was specified as a potential 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. Professional installers recognize the value of protecting 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 installation.
inches) of clearance. This allows substantial freedom in the positioning of the unit to
best serve the requirements of the structure.
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. CAUTION! Make sure to allow enough elevation to permit construction of the condensate trap. Also allow enough elevation
and clearance for opening the filter door
(removes to the front). See Service Clearances.

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INSTALLATION

Figure 1
Return Configurations and
Unit Orientations

NOTE:
Electronic Expansion
Valve (EEV) must be oriented vertically, and is
shipped for vertical cabinet orientation.
For horizontal cabinet
orientation, follow procedure to rotate the EEV
assembly. Refer to Figure 2.
WARNING
FOR HORIZONTAL CABINET ORIENTATION, EEV
MUST BE ROTATED TO
VERTICAL
POSITION!
Failure to reorient the
EEV can result in improper unit operation or
equipment damage or
dangerous condition.

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INSTALLATION—VERTICAL TO HORIZONTAL CONVERSION—EEV ROTATION
WARNING

Figure 2aVertical
Orientation

FOR HORIZONTAL CABINET
ORIENTATION, EEV MUST
BE ROTATED TO VERTICAL
POSITION! Failure to reorient the EEV in VERTICAL
position can result in improper unit operation or equipment damage or dangerous
condition.
CONVERSION PROCEDURE:
1. UNIT IS SHIPPED WITH NITROGEN
Figure 2bCHARGE. IF UNIT HAS ALREADY BEEN
Vertical
CHARGED WITH REFRIGERANT, REMOVE REOrientation
FRIGERANT CHARGE PER LOCAL CODES BEFORE PERFORMING CONVERSION PROCEDURE.
2. REMOVE PIPING PLUGS AND SAVE FOR LATER USE. NITROGEN WILL DISCHARGE FROM
COIL.
3. REMOVE PIPING GROMMETS; REMOVE LIQUID 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 COUPLING TAIL NUT SHOULD BE ALLOWED TO
TURN FREELY.
6. REPOSITION EXPANSION VALVE ASSEMBLY
AS SHOWN IN FIGURE 2d. ENSURE EXPANSION VALVE IS VERTICAL WITHIN +/- 15 DEG
WITH UNIT INSTALLED IN HORIZONTAL POSITION
7. REATTACH COUPLING AND
TIGHTEN TO 10-12 FT LBS
WHILE SECURING EEV BRACKET WITH WRENCH.
8. AS AN ALTERNATIVE TO
STEP 5 COUPLING MAY BE
TIGHTENED UNTIL NO
EEV BRACKET
THREADS ARE SHOWING
AND COUPLING IS BOTTOMED OUT. THEN TURN
AN ADDITIONAL 60 DEG
(OR ONE HEX FLAT) TO
TIGHTEN.
9. REINSTALL FRONT
PANELS, GROMMETS,
AND PIPING PLUGS.

Figure 2d-Horizontal
Orientation

Detail AEEV Detail

EEV IN VERTICAL
ORIENTATION

Figure 2c-Vertical
Orientation, Panels
Removed
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INSTALLATION—SERVICE CLEARANCES

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INSTALLATION—SERVICE CLEARANCESSIDE RETURN FILTER DETAILS

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INSTALLATION
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 ceilingsuspended horizontal orientation per suspension details (Figure 4). Unit is NOT intended
to be wall mounted. Consult a qualified structural engineer for special mounting considerations.
NOT TO SCALE

WARNING

MAINTAIN THESE DIMENSIONS FOR ADEQUATE TRAP
SEAL:
A = 3.5” MINIMUM
B = 2.0” MINIMUM

INSURE THAT THE UNIT IS ADEQUATELY
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.

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.

Install the unit so that it pitches slightly –(1/8
inch) – toward the condensate drain connection.
Condensate Drain
Install a trapped condensate drain line at unit drain
connection. All MVA units have 3/4 in. FPT condensate main and auxiliary drain connections.
Provide adequate trap clearance (trap depth) beneath 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 downward 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 fieldprovided 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 transmission to the structure.

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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 every 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 operation. This is particularly important where the
duct is exposed to highly humid conditions
in such places as attics, vented crawl spaces, unconditioned basements, and utility
rooms. The vapor seal prevents condensation of moisture in the insulating material
and subsequent loss of its insulating value.

MVA IOM 1.0 4-25-2014

Figure 4
CEILING SUSPENSION DETAILS

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INSTALLATION

CAUTION
Direct-expansion coils are shipped pressurized
with dry nitrogen. Release pressure from the coil
through valves in protective caps before removing caps.
Do not leave piping open to the atmosphere unnecessarily. Water and water vapor are detrimental 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.
Fig. 5 — Heater Accessory Installed
(right side panel not shown)

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 prevent damage to liquid line and suction line
components.
Size and install refrigerant lines in accordance
with the condensing unit manufacturer’s instructions. Provide insulation on the suction
line, to prevent condensation. Provide insulation 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.

Fig. 6 — Heater Accessory Installed
(right side and heater access panels
not shown)

DANGER
WARNING: Hazardous voltage. Only qualified
personnel must install the electrical service. Disconnect 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.

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INSTALLATION

DANGER

Install Procedure:
To install the electric heater,
1. Disconnect and lock out electrical power from
the unit. Remove heater access panel. Disconnect 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 bulkhead. 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.

WARNING: Hazardous voltage. Only qualified
personnel must install the electrical service. Disconnect and Lock Out all incoming power sources
before connecting to electrical service.
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 instructions for changing the EEPROM settings.

Item Code
07
38
3C

New Settings
0001
0002
-001
HEATER
SHROUD

G
RI

Fig. 8 — Heater
Accessory
Installed

HEATER
SHROUD

HEATER
ASSEMBLY

POWER
SWITCH(ES)

COVER
BOOT

HEATER
ACCESS
PANEL
HEATER
BULKHEAD

Fig. 7 — Heater Accessory Removal
(right side and heater access panels
not shown for clarity)
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INSTALLATION-ELECTRICAL

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 disconnect 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 heaters.
Failure to follow these warnings could lead to personal injury or death.
CAUTION

Typical wiring diagrams are shown on the following
pages FOR REFERENCE. Always refer to the wiring diagram on the air handling unit for actual wiring.

Use only copper conductors for field-installed electrical 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.

NOTE: CHECK MOTOR RATING PLATE FOR
CORRECT LINE VOLTAGE.
Connect electrical service to unit. Refer to unit wiring diagram.

Power Wiring
For power supply connection, route field power wiring 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 power switch inside the electrical section (see Figure 9). Note: power switch looks like a circuit
breaker but does not provide overload protection. Power switch provided only with electric heater (field kit or factory installed). NOTE:
When electric heat greater than 10kW is provided, two power supply circuits are required,
as shown on the wiring diagram.

Make wiring connections in accordance with the
system wiring system diagram and these instructions. 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 conditioner caused by electrical noise, route control wiring
and inter-unit control wiring SEPARATELY FROM
THE POWER WIRING!

POWER
SWITCH

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 control 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 control box located behind the blower access door, or
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Figure 9
Unit with Electric Heat
MVA IOM 1.0 4-25-2014

DANGER

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 overcurrent protection device. Installation must comply
with NEC and local codes.

WARNING: Hazardous voltage. Only qualified
personnel must install the electrical service. Disconnect 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.
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!

nections. Refer to the condensing unit operation manual for more details.

For communicating controls, refer to Figures 10
through 13 for max lengths, sizing and interconFigure 10
Building System Wiring Diagram
(multiple indoor & outdoor units)

NOTE: See table below for wire requirements
for lines above marked “A”, “B”, “C” and “D”.

Control w iring

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(A) Inte r- unit (be twe e n
outdoor a nd indoor units)
c ontrol wiring

(B) Re mote c ontrol wiring

AWG #18 (0.75 mm2)

Max. 3,280 ft.

Max. 1,640 ft.

(D) Inte r- outdoor unit
c ontrol wiring

AWG #18 (0.75 mm2)

Max. 650 ft. (Total)

Max. 980 ft.

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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 splices or “star branch” pattern. Star branch wiring
causes misaddress setting errors.

Figure 13
Branched Inter-Unit Control Wiring
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 number.)

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INSTALLATION-ELECTRICAL (cont’d)

TYPICAL WIRING DIAGRAM—
Unit sizes 18 & 24

TYPICAL WIRING—MVA18, MVA24

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INSTALLATION-ELECTRICAL (cont’d)

TYPICAL WIRING DIAGRAM—
Unit sizes 30, 36, 42, 48 & 60

TYPICAL WIRING—MVA30, MVA36,
MVA42, MVA48, MVA60

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INSTALLATION-ELECTRICAL (cont’d)
TYPICAL WIRING DIAGRAMS—
Electric Heat: 1-6kW and 8-9.5kW

TYPICAL WIRING—ELECTRIC HEAT

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INSTALLATION-ELECTRICAL (cont’d)
TYPICAL WIRING DIAGRAMS—
Electric Heat: 14.5kW and 19.5kW

TYPICAL WIRING—ELECTRIC HEAT

035-000039-001

Page 23 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 temperature controls, and outside air dampers.
Startup
1. Insure electrical installation agrees with the unit nameplate (voltage, branch circuit protection, wire size).
2. Close all panels and access doors. Make sure filter media is clean before starting unit. Replace filter if necessary.
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 without significant noise or vibration.
8. Allow control system to start condensing unit, or as required 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.

Fig. 14 — Fan Wheel Rotation—
FORWARD CURVED FAN

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.

035-000039-001

Page 24 of 38

MVA IOM 1.0 4-25-2014

Figure 15
Increasing ESP setting

Stay

Shift all
three
down

As Shipped

Higher Fan Setting

MVA18

Areas not recommend for operation due to excess velocity

ESP
Fan Setting
High Top
High
Medium
Low

RPM
969
902
898
827

0.000
SCFM
833
774
772
711

Fan Setting
High Top
High
Medium
Low

RPM
1236
1109
969
902

0.000
SCFM
1052
959
833
774

WATTS
394
284
188
156

RPM
1265
1155
1022
955

0.100
SCFM
1034
929
804
749

WATTS
396
296
197
163

RPM
1301
1198
1067
1016

0.200
SCFM
996
908
780
717

WATTS
383
302
206
173

Fan Setting
High Top
High
Medium
Low

RPM
828
764
708
630

0.000
SCFM
1263
1160
1064
940

WATTS
275
219
171
121

RPM
851
795
737
663

0.100
SCFM
1221
1114
1017
892

WATTS
287
224
175
125

RPM
865
819
758
693

0.200
SCFM
1186
1076
973
835

WATTS
286
239
178
130

Fan Setting
High Top
High
Medium
Low

RPM
934
881
764
708

0.000
SCFM
1425
1342
1160
1064

WATTS
406
393
219
171

RPM
943
900
795
737

0.100
SCFM
1396
1311
1114
1017

WATTS
414
347
224
175

RPM
966
920
819
758

0.200
SCFM
1358
1271
1076
973

WATTS
417
356
239
178

Fan Setting
High Top
High
Medium
Low

RPM
967
835
760
717

0.000
SCFM
1722
1475
1311
1228

WATTS
525
332
248
211

RPM
985
862
784
742

0.100
SCFM
1679
1425
1271
1184

WATTS
529
343
258
218

RPM
1009
890
803
767

0.200
SCFM
1642
1388
1229
1140

WATTS
541
353
263
225

Fan Setting
High Top
High
Medium
Low

RPM
1057
967
835
760

0.000
SCFM
1894
1722
1475
1311

WATTS
1040
525
332
248

RPM
1080
985
862
784

0.100
SCFM
1872
1679
1425
1271

WATTS
1031
529
343
258

RPM
1093
1009
890
803

0.200
SCFM
1816
1642
1388
1229

WATTS
1020
541
353
263

Fan Setting
High Top
High
Medium
Low

RPM
982
878
760
689

0.000
SCFM
2323
2082
1793
1603

WATTS
1010
699
427
314

RPM
1010
909
807
724

0.100
SCFM
2269
2027
1716
1544

WATTS
1040
711
450
326

RPM
1037
946
825
761

0.200
SCFM
2222
1959
1667
1489

WATTS
1050
733
466
342

WATTS
188
156
152
116

RPM
1022
955
960
897

0.100
SCFM
804
749
737
670

WATTS
197
163
160
123

RPM
1067
1016
1012
956

0.200
SCFM
780
717
711
641

WATTS
206
173
169
131

RPM
1132
1067
1091
1050

0.300
SCFM
743
690
669
596

WATTS
215
181
176
137

RPM
1173
1102
1132
1090

0.400
SCFM
711
656
633
555

WATTS
222
193
182
142

RPM
1201
1144
1158
1115

0.500
SCFM
666
611
569
473

WATTS
224
201
187
149

0.300
SCFM
953
882
743
690

WATTS
345
311
215
181

RPM
1351
1284
1173
1102

0.400
SCFM
897
849
711
656

WATTS
340
319
222
193

RPM
1430
1304
1201
1144

0.500
SCFM
838
780
666
611

WATTS
261
302
224
201

0.300
SCFM
1142
1037
932
797

WATTS
301
241
190
138

RPM
922
825
785
750

0.400
SCFM
1105
1014
886
743

WATTS
306
243
194
143

RPM
915
874
856
806

0.500
SCFM
1082
975
844
696

WATTS
309
251
204
152

0.300
SCFM
1319
1229
1037
932

WATTS
426
356
241
190

RPM
1005
967
825
785

0.400
SCFM
1279
1195
1014
886

WATTS
432
365
243
194

RPM
1032
986
874
856

0.500
SCFM
1246
1160
975
844

WATTS
440
370
251
204

0.300
SCFM
1597
1335
1195
1099

WATTS
546
365
274
236

RPM
1050
940
870
840

0.400
SCFM
1557
1287
1151
1046

WATTS
558
372
286
246

RPM
1071
970
900
878

0.500
SCFM
1510
1238
1114
994

WATTS
567
370
290
254

0.300
SCFM
1764
1597
1335
1195

WATTS
1010
546
365
274

RPM
1109
1050
940
870

0.400
SCFM
1685
1557
1287
1151

WATTS
990
558
372
286

RPM
1122
1071
970
900

0.500
SCFM
1629
1510
1238
1114

WATTS
975
567
370
290

0.300
SCFM
2180
1932
1623
1425

WATTS
1070
754
488
362

RPM
1093
1007
913
846

0.400
SCFM
2132
1889
1577
1373

WATTS
1090
771
506
380

RPM
1115
1038
956
890

0.500
SCFM
2092
1844
1517
1335

WATTS
1110
791
520
400

MVA24
ESP
RPM
1327
1233
1132
1067

MVA30

Airflow Performance

ESP
RPM
898
843
794
730

MVA36
ESP
RPM
988
939
843
794

MVA42
ESP
RPM
1029
918
834
803

MVA48
ESP
RPM
1104
1029
918
834

MVA60
ESP
RPM
1064
979
873
805

NOTES:
1. Data at sea level w/ 1" throw-away filter and dry coil.

035-000039-001

Page 25 of 38

MVA IOM 1.0 4-25-2014

Airflow Performance Curves
MVA18

MVA24

0.40

0.35
0.30
0.25
0.20
0.15

External Static Pressure (inch W.G.)

Area not recommended for use for
exessive airflow

External Static Pressure (inch W.G.)

0.45

0.10
0.05

0.45
0.40

400

0.30
0.25
0.20
0.15
0.10
0.05

500

600
700
Airflow (SCFM)

800

600

900

700

800
900
Airflow (SCFM)

MVA30

1000

1100

MVA36
0.50
External Static Pressure (inch W.G.)

0.50
External Static Pressure (inch W.G.)

0.35

0.00

0.45
0.40
0.35
0.30
0.25
0.20

0.15
0.10
0.05

0.45
0.40
0.35
0.30
0.25
0.20

1300

1400

0.15
0.10
0.05
0.00

0.00
600

700

800

900
1000
Airflow (SCFM)

1100

1200

800

1300

900

1000

MVA42

1100
1200
Airflow (SCFM)

1500

MVA48
0.50
External Static Pressure (inch W.G.)

0.50
External Static Pressure (inch W.G.)

Area not recommended for use for
exessive airflow

0.50

0.45
0.40
0.35
0.30
0.25
0.20

0.15
0.10
0.05
1000

1200
1400
Airflow (SCFM)

1600

0.40
0.35
0.30
0.25
0.20

1800

0.15
0.10
0.05
0.00
1000

0.00
800

0.45

1200

1400
1600
Airflow (SCFM)

1800

2000

MVA60
External Static Pressure (inch W.G.)

0.50
0.45
0.40
0.35
0.30
0.25
0.20

0.10
0.05
0.00
1200

035-000039-001

0.15

1400

1600

1800
2000
Airflow (SCFM)

Page 26 of 38

2200

2400

MVA IOM 1.0 4-25-2014

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 disconnect 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
heaters.
Failure to follow these warnings could lead to personal injury or death.
SERVICE
General
1. Review Safety Considerations at beginning of
these instructions. Good safety habits are important tools when performing service procedures.
2. To make speed measurements, use a laser-style
tachometer.

MOTOR
HARNESS &
CONNECTORS

Figure 16
MOTOR
HARNESS &
CONNECTORS

Fan Motor Replacement
WARNING: Shut off motor power and lock out power
supply.
Remove Blower/Motor Assembly
Procedure:
1. Disconnect wiring harness plugs from motor (Fig.
16 and 17).
2. Remove blower mounting bolts, which secure the
blower rails upward against the blower deck
(2ea).
3. Remove motor/wheel assembly from the AHU by
sliding out (Figure 18).
4. See Figure 19. Loosen shaft set screw (opposite
motor side) and motor mount tightening screw
until motor can be removed.
5. Remove motor. Install new motor (Fig. 20), tighten motor mount bolt, then locate fan wheel and
tighten shaft set screw.
6. Reverse steps 1-4 to reinstall fan. Make sure
that the two clips at the back hold the blower rails
up against the blower deck.
7. Spin fan by hand to make sure there is no rubbing or interference.
8. Close unit access doors, remove lockout/tag out
and restore the unit to operation.

035-000039-001

Page 27 of 38

Figure 17

MVA IOM 1.0 4-25-2014

Fan System Periodic Maintenance
1. The factory strongly recommends use of a Preventive Maintenance program to insure that the unit
operates safely and efficiently.
2. Motor bearings are permanently sealed and do not
require lubrication.
3. Clean the fan’s flow area - maintenance interval in
accordance with the degree of contamination.
4. The fan wheel can be cleaned with a moist cloth.
5. Do not use any aggressive, paint solvent cleaning
agents when cleaning.
6. Never use a high-pressure cleaner or water-spray
for cleaning - particularly when the fan is running.
Coil Cleaning
DETERGENT — Spray mild detergent solution on
coils with garden-type sprayer. Rinse with fresh water.
Check to ensure condensate line is free. Excess water
from cleaning may flood unit if condensate line is
plugged.

MOTOR/
BLOWER
SLIDES OUT

Figure 18

Figure 19

Figure 20

035-000039-001

Page 28 of 38

MVA IOM 1.0 4-25-2014

SERVICE—Filters
Filters
FILTER SECTIONS — Open or remove
filter panel to replace old filter with a new
filter. See physical data tables for filter
data. See Figure 21.

Figure 22

Figure 21

035-000039-001

Access Panels
The 3 sections of the unit can be reached
using the front access panels, removable
using 5/16” socket or driver or flat head
screwdriver. See Figure 22.

Page 29 of 38

MVA IOM 1.0 4-25-2014

SERVICE-Coil Removal and Reinstallation Procedure
1. Perform procedure on the ground for safety. If
working at heights USE EXTREME CAUTION observe all FALL SAFETY considerations. Under all
conditions, LOCK OUT all power supplies before
performing this procedure. WARNING! Coil section can be heavy—use proper lifting equipment.
2. Isolate coil and reclaim refrigerant. Disconnect
unit from piping. Remove supply piping to allow
access into the coil section from the front.
3. Remove blower access door and coil access
doors.
4. Carefully remove temperature sensors from the
coil and set them aside, clear of the coil & drain
pan assembly. Disconnect electronic expansion
valve (EEV) wiring from the EEV.
5. Remove 4 screws on the drain pan side of the
cabinet (right side shown in Fig. 23). Remove 4
screws from coil support side of the cabinet (left
side shown in Fig. 23).
6. Slide coil & drain pan assembly out of the unit (Fig
19).
7. Coil can be detached from drain pan using 5/16”
driver, 2 screws. Coil can be detached from coil
support using 5/16” driver, 4 screws.
8. Follow instructions in reverse to install new coil.

9. Re-install sensors back in original positions. CAUTION! Be sure to place sensors in correct locations for proper unit
operation.
10. Re-install wiring to EEV.
11. Re-install unit access panels.
12. Return unit to service.

COIL SUPPORT

DRAIN PAN

Figure 23
035-000039-001

Page 30 of 38

MVA IOM 1.0 4-25-2014

UNIT ELECTRICAL RATINGS

MVA Electrical Data
MOTOR
TOTAL
FLA
ELECTRIC
240HT (KW)
240 208
208V
NONE
1.0
0.8
3.0
2.3
3.0
18/24
5.0
3.8
6.0
4.5
8.0
6.0
9.5
7.1
NONE
1.0
0.8
3.0
2.3
5.0
3.8
3.6
30/36
6.0
4.5
8.0
6.0
9.5
7.1
14.5 10.9
NONE
1.0
0.8
3.0
2.3
5.0
3.8
4.9
42
6.0
4.5
8.0
6.0
9.5
7.1
14.5 10.9
19.5 14.6
NONE
1.0
0.8
3.0
2.3
5.0
3.8
6.0
48
6.0
4.5
8.0
6.0
9.5
7.1
14.5 10.9
19.5 14.6
NONE
1.0
0.8
3.0
2.3
5.0
3.8
7.6
60
6.0
4.5
8.0
6.0
9.5
7.1
14.5 10.9
19.5 14.6
MVA
Unit
Size

ELECTRIC HEAT AMPS
CIRCUIT 1
240 208
NONE
4.2
3.6
12.5 10.8
20.8 18.1
25.0 21.7
33.3 28.9
39.6 34.3
NONE
4.2
3.6
12.5 10.8
20.8 18.1
25.0 21.7
33.3 28.9
39.6 34.3
39.6 34.3
NONE
4.2
3.6
12.5 10.8
20.8 18.1
25.0 21.7
33.3 28.9
39.6 34.3
39.6 34.3
39.6 34.3
NONE
4.2
3.6
12.5 10.8
20.8 18.1
25.0 21.7
33.3 28.9
39.6 34.3
39.6 34.3
39.6 34.3
NONE
4.2
3.6
12.5 10.8
20.8 18.1
25.0 21.7
33.3 28.9
39.6 34.3
39.6 34.3
39.6 34.3

CIRCUIT 2
240 208
NONE
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
NONE
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
20.8 18.1
NONE
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
20.8 18.1
41.7 36.1
NONE
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
20.8 18.1
41.7 36.1
NONE
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
20.8 18.1
41.7 36.1

UNIT FLA
CIRCUIT 1
240 208
3.0
3.0
7.2
6.6
15.5 13.8
23.8 21.1
28.0 24.7
36.3 31.9
42.6 37.3
3.6
3.6
7.8
7.2
16.1 14.4
24.4 21.7
28.6 25.3
36.9 32.5
43.2 37.9
43.2 37.9
4.9
4.9
9.1
8.5
17.4 15.7
25.7 23.0
29.9 26.6
38.2 33.8
44.5 39.2
44.5 39.2
44.5 39.2
6.0
6.0
10.2 9.6
18.5 16.8
26.8 24.1
31.0 27.7
39.3 34.9
45.6 40.3
45.6 40.3
45.6 40.3
7.6
7.6
11.8 11.2
20.1 18.4
28.4 25.7
32.6 29.3
40.9 36.5
47.2 41.9
47.2 41.9
47.2 41.9

CIRCUIT 2
240 208
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
20.8 18.1
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
20.8 18.1
41.7 36.1
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
20.8 18.1
41.7 36.1
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
20.8 18.1
41.7 36.1

MINIMUM CIRCUIT
AMPACITY
CIRCUIT 1 CIRCUIT 2
240 208 240 208
3.8
3.8
n/a
n/a
9.0
8.3
n/a
n/a
19.4 17.3 n/a
n/a
29.8 26.3 n/a
n/a
35.0 30.8 n/a
n/a
45.4 39.9 n/a
n/a
53.2 46.6 n/a
n/a
4.5
4.5
n/a
n/a
9.7
9.0
n/a
n/a
20.1 18.0 n/a
n/a
30.5 27.1 n/a
n/a
35.8 31.6 n/a
n/a
46.2 40.6 n/a
n/a
54.0 47.4 n/a
n/a
54.0 47.4 26.0 22.6
6.1
6.1
n/a
n/a
11.3 10.6 n/a
n/a
21.8 19.7 n/a
n/a
32.2 28.7 n/a
n/a
37.4 33.2 n/a
n/a
47.8 42.2 n/a
n/a
55.6 49.0 n/a
n/a
55.6 49.0 26.0 22.6
55.6 49.0 52.1 45.1
7.5
7.5
n/a
n/a
12.7 12.0 n/a
n/a
23.1 21.0 n/a
n/a
33.5 30.1 n/a
n/a
38.8 34.6 n/a
n/a
49.2 43.6 n/a
n/a
57.0 50.4 n/a
n/a
57.0 50.4 26.0 22.6
57.0 50.4 52.1 45.1
9.5
9.5
n/a
n/a
14.7 14.0 n/a
n/a
25.1 23.0 n/a
n/a
35.5 32.1 n/a
n/a
40.8 36.6 n/a
n/a
51.2 45.6 n/a
n/a
59.0 52.4 n/a
n/a
59.0 52.4 26.0 22.6
59.0 52.4 52.1 45.1

Maximum Overcurrent
Protective Device (A)
CIRCUIT 1 CIRCUIT 2
240 208 240 208
15
15
n/a
n/a
15
15
n/a
n/a
20
20
n/a
n/a
30
30
n/a
n/a
35
35
n/a
n/a
50
40
n/a
n/a
60
50
n/a
n/a
15
15
n/a
n/a
15
15
n/a
n/a
25
20
n/a
n/a
35
30
n/a
n/a
40
35
n/a
n/a
50
45
n/a
n/a
60
50
n/a
n/a
60
50
30
25
15
15
n/a
n/a
15
15
n/a
n/a
25
20
n/a
n/a
35
30
n/a
n/a
40
35
n/a
n/a
50
45
n/a
n/a
60
50
n/a
n/a
60
50
30
25
60
50
60
50
15
15
n/a
n/a
15
15
n/a
n/a
25
25
n/a
n/a
35
35
n/a
n/a
40
35
n/a
n/a
50
45
n/a
n/a
60
60
n/a
n/a
60
60
30
25
60
60
60
50
15
15
n/a
n/a
15
15
n/a
n/a
30
25
n/a
n/a
40
35
n/a
n/a
45
40
n/a
n/a
60
50
n/a
n/a
60
60
n/a
n/a
60
60
30
25
60
60
60
50

MIN
WIRE
SIZE
AWG*
14
14
12
10
8
8
6
14
14
10
8
8
8
6
6
14
14
10
10
8
8
6
6
6
14
14
10
10
8
8
6
6
6
14
14
10
8
8
6
6
6
6

Notes:
*1. Minimum Wire Gauge is based upon Circuit 1 ampacity and the use of 75C wire at the unit.
2. 14.5kW and 19.5kW Heating units require two supply circuits.
3. MVA18/24 use ECM 5.0 motor. MVA30/36/42/48/60 use ECM-VE motor.

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MVA IOM 1.0 4-25-2014

UNIT DIMENSIONS

035-000039-001

MVA18-60 Elec Heat Ready
RH Drain Connections—Configuration B

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MVA IOM 1.0 4-25-2014

UNIT DIMENSIONS

035-000039-001

MVA18-60 Elec Heat Ready
LH Drain Connections—Configuration T

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MVA IOM 1.0 4-25-2014

UNIT DIMENSIONS

035-000039-001

MVA18-60 Elec Heat Ready
RH Return — Configuration R

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MVA IOM 1.0 4-25-2014

UNIT DIMENSIONS

035-000039-001

MVA18-60 Elec Heat Ready
LH Return — Configuration L

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MVA IOM 1.0 4-25-2014

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035-000039-001

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MVA IOM 1.0 4-25-2014

MVA Series Air Handling Unit
Start-up Report

Job Name

City

Sales Order #

Unit Tag

Model Number

Serial Number

Installer

Quantity of Units

STARTUP REPORT
Group

Checklist Item

Yes

Electrical/
Operational

Does electrical service correspond to unit nameplate?
-Nameplate Supply Voltage/Phase: Rated_________ Measured___________
-Nameplate Rated FLA motor current: Rated_______ Measured__________

Structural

Does all field wiring conform to unit wiring diagram?
Is field-provided freeze protection present? (if required)
Is fan wheel turning the correct direction?
Is the filter clean?
Is unit properly supported?
Is unit installed level (necessary for proper condensate drainage)?
Is properly sized condensate trap present?
Is the condensate disposal system operating correctly?
Is auxiliary external condensate drain pan installed or auxiliary drain connection
utilized as recommended by IOM? (not required for valid warranty)

Piping Check

CRITICAL! For Horizontal Unit Orientation: Is the EEV in vertical orientation?
Is the DX system charged per the condensing unit instructions?
Is unit piping correct and insulated to prevent condensation?
Are the refrigerant pipe lines properly insulated?
Are there any leaks detected: interior to unit or at connections?

035-000039-001

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MVA IOM 1.0 4-25-2014

MVA Series Air Handling Unit
Installation, Operation and Maintenance Manual

035-000039-001

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MVA IOM 1.0 4-25-2014

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Panasonic Mva Series Air Handling Unit Service Manual IOM 1.0

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