Manual 2100-356
Page 4
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TABLE 2
ELECTRICAL SPECIFICATIONS
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Conditioning Contractors of America (ACCA). The air duct
should be installed in accordance with the Standards of the
National Fire Protection Association for the Installation of
Air Conditioning and Ventilating systems of Other Than
Residence Type, NFPA No. 90A, and Residence Type
Warm Air Heating and Air Conditioning Systems, NFPA
No. 90B. Where local regulations are at a variance with
instructions, installer should adhere to local codes.
DUCT WORK
Any heat pump is more critical of proper operating charge
and an adequate duct system than a straight air conditioning
unit. All duct work, supply and return, must be properly
sized for the design air flow requirement of the equipment.
Air Conditioning Contractors of America (ACCA) is an
excellent guide to proper sizing. All duct work or portions
thereof not in the conditioned space should be properly
insulated in order to both conserve energy and prevent
condensation or moisture damage.
Refer to Table 10 for maximum static pressure available for
duct design.
Design the duct work according to methods given by the Air
Conditioning Contractors of America (ACCA). When duct
runs through unheated spaces, it should be insulated with a
minimum of one inch of insulation. Use insulation with a
vapor barrier on the outside of the insulation. Flexible
joints should be used to connect the duct work to the
equipment in order to keep the noise transmission to a
minimum.
A 1/4 inch clearance to combustible material for the first
three feet of duct attached to the outlet air frame is required.
See Pages Wall Mounting Instructions and Figure 3 for
further details.
Ducts through the walls must be insulated and all joints
taped or sealed to prevent air or moisture from entering the
wall cavity.
CAUTION: Some installations may not require any return
air duct. A metallic return air grille is required with
installations not requiring a return air duct. The spacing
between louvers on the grille shall not be larger than
5/8 inches.
Maximum size of the time delay fuse or HACR type circuit breaker for protection
of field wiring conductors.
Based on 75° C copper wire. All wiring must conform to NEC and all local codes.
These “Minimum Circuit Ampacity” values are to be used for sizing the field power
conductors. Refer to the National Electric Code (latest revision), article 310, for
power conductor sizing.
CAUTION: When more than one field power conductor
circuit is run through one conduit the conductors must be derated. Pay special
attention to note 89 of table 310 regarding Ampacity Adjustment Factors when
more than 3 are in a raceway.
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