Panasonic Mva Series Air Handling Unit 035 000039 001 Installation Operation And Maintenance Manual

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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-
formedonlyby 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 
						

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/ŶƐƚĂůůĂƟŽŶ͕^ƚĂƌƚ-Up
and Service
/ŶƐƚƌƵĐƟŽŶƐ
MVA Series Air Handling Unit
Installation, Operation and Maintenance
Manual
Topic Page
SAFETY CONSIDERATIONS1, 5
PRODUCT NOMENCLATURE6-7
UNPACKING8
INSTALLATION8
Pre -insta lla tion8
Rigging8
Unpa cka ging8
Se rvice Cle a ra nce s8,11,12
Re turn Air & Unit Orie nta tion9
Ve rtica l to Horizonta l Conve rsion (EEV)10
Unit Suspe nsion or Floor Mount8,13,14
Conde nsa te Dra in13
Ductw ork13
Re frige ra nt Piping15
Ele ctric He a te r Acce ssory15-16
Ele ctrica l17-23
START-UP24-26
Fa n Airflow Ste p-Up24-25
Airflow Da ta25-26
SERVICE27-29
Fa n & Fa n Motor27-28
Filte rs29
Acce ss Pa ne ls29
Coil & Dra in Pa n Se rvice30
ELECTRICAL RATINGS31
DIMENSIONS32-35
Sta rtup Re port37 
						

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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 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. 
						

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PRODUCT NOMENCLATURE
Unit Type/Size
Code Selection
01, 02 MV
Generation/Series
Code Selection
03 A
Unit Type/Size
Code Selection NOM Capacity
18
24
3030,000 Btu/hr
36
42
48
60
Primary Coil Type
Code Selection
06F4 ROW DX with electronic expans ion valve, R-410a
Heating Coil
Code Selection
B
C
D
E
F
G
H
I19.5 kW - s ingle phas e w/circuit breaker only * 1 s tage (s ize 42, 48, 60)
Notes: *
Future Use Description
Code Selection
08A
1. Electric Heat KW rated at 230V. For 208V operation, derate heater to 75% of 230V rating.
2. Electric Heat com plete with circuit breaker s tyle power s witch.
3. 14.5 and 19.5 kW s hall have two s upply circuits .
Future Us e
Description
Description
Description
07
Electric Heat Ready (field ins talled kit - EH Top will be provided)*
3.0 kW - s ingle phas e w/circuit breaker only*1 s tage (all s izes )
5.0 kW - s ingle phas e w/circuit breaker only * 1 s tage (all s izes )
6.0 kW - s ingle phas e w/circuit breaker only * 1 s tage (all s izes )
8.0 kW - s ingle phas e w/circuit breaker only * 1 s tage (all s izes )
9.5 kW - s ingle phas e w/circuit breaker only * 1 s tage (all s izes )
14.5 kW - s ingle phas e w/circuit breaker only * 1 s tage (s ize 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
Revis ion Level
Description
Direct Drive Multiposition air handling unit
Description 
						

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Unit Grade Description
Code Selection
09S
Unit Voltage
Code Selection
106
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
C
D
G
H
Tracking Description
Code Selection
14P
Vert ic al (Fro nt RH C o ndD rain Cnx)
Unit Orientation
H o rizo ntal Lef t o rVert ic al (F ro nt LHC o ndens at e D rain Cnx)
Panas onic
12
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
13
Fiberglas s , Univers al Drainpan - Galvanized
Fiberglas s , Univers al Drainpan - Stainles s Steel
Foil Face Fiberglas s , Univers al Drainpan - Galvanized
Foil Face Fiberglas s , Univers al Drainpan - Stainles s Steel
Vert ic al (Fro nt RH C o ndD rain C nx) o r Ho rizo nt alRight
Vert ic al (F ro nt LH C o ndD rain Cnx)
Description
208/230/1/60 ECM-VE(customer change transf ormer tap f or 208V )
Description
Panas onic control board & low voltage interface
Standard
Description
PRODUCT NOMENCLATURE—CONT’D 
						

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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. 
						

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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. 
						

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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 ALLOW ED 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 VERTICALORIENTATION
EEV BRACKET