FMC5X, FMC5Z: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Connections for control wiring are made with wire nuts. Control wiring
knockouts (5/8"and 7/8") are also provided on the right and left side of
the unit for side connection.
See wiring diagrams attached to indoor and outdoor sections to be
connected. Make sure, after installation, that separation of control wiring
and power wiring has been maintained.
Power Wiring
It is important that proper electrical power is available for connection to
the unit model being installed. See the unit nameplate wiring diagram
and electrical data in the installation instructions.
If required, install a branch circuit disconnect of adequate size, located
within sight of, and readily accessible to the unit.
IMPORTANT: After the Electric Heater is installed, units may be
equipped with one two or three 30-60 amp. circuit breakers. These
breaker(s) protect the internal wiring in the event of a short circuit and
serve as a disconnect. Circuit breakers installed within the unit do not
provide over-current protection of the supply wiring and therefore may
be sized larger than the branch circuit protection.
NOTE: The indoor unit air switch cannot be used as a circuit breaker
and cannot be operated by users. Maintenance personnel need to
disconnect the main switch before operation.
Supply circuit power wiring must be 75°C minimum copper conductors
only. See Electrical Data in this section for ampacity, wire size and
circuit protector requirement. Supply circuit protective devices may be
either fuses or “HACR” type circuit breakers.
Power wiring may be connected to either the right, left side or top. Three
7/8", 1-3/8", 1-3/4" dia. concentric knockouts are provided for
connection of power wiring to unit.
Power wiring is connected to the power terminal block in unit electric
cabinet.
Grounding may be accomplished by grounding metal conduit when
installed in accordance with electrical codes to the unit cabinet.
Grounding may also be accomplished by attaching ground wire(s) to
ground lug(s) provided in the unit wiring compartment.
Ground lug(s) are located close to wire entrance on left side of unit
(up-flow). Lug(s) may be moved to marked locations near wire entrance
on right side of unit (up-flow). If alternate location is more convenient.
Use of multiple supply circuits require grounding of each circuit to lug
(s) provided in unit.
DUCTWORK
Field ductwork must comply with the National Fire Protection
Association NFPA 90A, NFPA 90B and any applicable local ordinance.
Sheet metal ductwork in unconditioned spaces must be insulated and
covered with a vapor barrier. Fibrous ductwork may be used if
constructed and installed in accordance with SMACNA Construction
Standard on Fibrous Glass Ducts. Ductwork must comply with National
Fire Protection Association as tested by UL Standard 181 for Class I Air
Ducts. Check local codes for requirements on ductwork and insulation.
Duct system must be designed within the range of external static
pressure the unit is designed to operate against. It is important that the
system airflow be adequate. Make sure supply and return ductwork,
grills, special filters, accessories, etc. are accounted for in total
resistance. See airflow performance tables in this manual.
Design the duct system in accordance with “ACCA” Manual “D” Design
for Residential Winter and Summer Air Conditioning and Equipment
Selection. Latest editions are available from: “ACCA” Air Conditioning
Contractors of America, 1513 16th Street, N.W., Washington, D.C.
20036. If duct system incorporates flexible air duct, be sure pressure
drop information (straight length plus all turns) shown in “ACCA”
Manual “D” is accounted for in the system.
Supply plenum is attached to the 3/4” duct flanges supplied with the
unit. Attach flanges around the blower outlet.
IMPORTANT: If an elbow is included in the plenum close to the unit,
it can not be smaller than the dimensions of the supply duct flange on the
unit.
IMPORTANT: The front flange on the return duct if connected to the
blower casing must not be screwed into the area where the power wiring
is located. Drills or sharp screw points can damage insulation on wires
located inside unit.
Secure the supply and return ductwork to the unit flanges, using proper
fasteners for the type of duct used and tape the duct-to-unit joint as
required to prevent air leaks.
SHOCK HAZARD
The unit must be permanently grounded. Failure to do so can result in
electrical shock causing personal injury or death.
PERSONAL INJURY HAZARD
Do not, under any circumstances, connect return ductwork to any other
heat producing device such as fireplace insert, stove, etc.Unauthorized
use of such devices may result in fire, carbon monoxide poisoning,
explosion, personal injury or property damage.
PERSONAL INJURY HAZARD
If appliances connected via an air duct system to one or more rooms are
installed in a room with an area less than shown in Annex A table 2-2,
that room shall be without continuously operating open flames (e.g. an
operating gas appliance) or other potential ignition sources (for
example, an operating electric heater, hot surfaces). A flame-producing
device may be installed in the same space if the device is provided with
an effective flame arrest. For appliances connected via an air duct
system to one or more rooms, auxiliary devices which may be a
potential ignition source shall not be installed in the ductwork.
Examples of such potential ignition sources are hot surfaces with a
temperature exceeding 700°C and electric switching devices. For
appliances connected via an air duct system to one or more rooms, only
auxiliary devices approved by the appliance manufacturer or declared
suitable with the refrigerant shall be installed in connecting ductwork.
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