Panasonic MVA Series Air Handling Unit Mva18 24 30 36 42 48 60 Fbas6hbcp Installation Operation And Maintenance Manual

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INSTALLATION—SERVICE CLEARANCES 

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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...

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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 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....

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INSTALLATIONDANGER
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...

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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 W ithout EH: to field-provided and installed
disconnect switch and from...

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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...

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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 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...

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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