AIR DISTRIBUTION DUCTS
HBC(X), PHBC(X), RHBC(X), CHBC(X):
Installation, Operation, and Maintenance Instructions
5
AIR DISTRIBUTION DUCTS
All duct work must be installed in accordance with National Fire Protection
Association Codes 90A and 90B. Ducts should be adequately insulated to
prevent condensation during the cooling cycle and to minimize heat loss
during the heating cycle. All return air must be filtered to prevent dirt buildup
on the coil surface. If there is no ducted return, applicable installation codes
may limit the unit to installation only in a single story residence. In many cases
it is acceptable to use ducting of the same size as the fan coil connections.
However, unique arrangements or long duct runs must be confirmed by a local
professional. The manufacturer will not be responsible for misapplied
equipment.
Supply and return duct system must be adequately sized to meet the system’s
air requirements and static pressure capabilities. The duct system should be
insulated with a minimum of 1-inch insulation with a vapor barrier in
conditioned areas or 2-inches, minimum, in unconditioned areas.
ELECTRICAL
WARNINGS:
Electric Shock Hazard
•
Disconnect all power supplies before servicing; lock out/tag out to
prevent accidental electrical shock. Note: there may be multiple power
sources.
•
Use copper conductors only.
•
Install all parts and panels before operating.
•
Failure to follow these warnings can result in injury or death.
All wiring must comply with local and national code requirements. Units are
provided with wiring diagrams and nameplate data to provide information
required for necessary field wiring. On some unit models, remote control boxes
are furnished for field installation. In these instances, ensure that the control
box used is the same as that indicated by the marking on the unit. The control
box should be located as near the unit as possible in a location readily
accessible for servicing. Wiring between the control box and the unit must be
in accordance with the diagrams provided. The field wiring between the control
box and the motor junction box must be installed using either flexible metal
conduit or armored cable with sufficient length to allow removal of the blower
section for service.
These units are provided with a Class 2 transformer for 24-volt control circuits.
Should any add-on equipment also have a Class 2 transformer furnished, care
must be taken to prevent interconnecting outputs of the two transformers by
using a thermostat with isolating contacts.
