Catalogue

UV-PRC003-EN 87
Mechanical Specifications
General
Deliver and install a complete unit ventilator certified for ventilation at AHRI-840, or tested by an
independent testing and balancing lab witnessed by owner’s representative.
Safety
All standard units are UL-listed in the United States and Canada and comply with NFPA 90A
requirements.
The unit ventilator is certified or rated in accordance to the following listings for performance proof
and safety: ETL, AHRI-840, AHRI-350, L
ONMARK
®
, BACnet
®
Equipment Construction
Exterior cabinetry is constructed of heavy-gauge metal for strength and durability. All exposed
edges shall be rounded to safeguard against injury. All interior sheet metal shall be of galvanized
steel to restrain against deterioration.
The front plane of the unit consists of a three panel design. The control compartment is accessible
without removing the entire front panel. The discharge air grille contains rounded edged steel bars,
and are placed at a 15° slope to provide proper airflow deflection.
Access for inspection and cleaning of the unit drain pan, coils, and fan section is provided. The unit
shall be installed for proper access. Procedures for proper maintenance of the unit shall is included
in the installing, operation manual.
Cabinet insulation is closed cell to maximize thermal performance. It is suitable for use in air
streams up to 4500 feet per minute (fpm). Insulation will meet the Underwriters Laboratories Fire
Hazard Classification and long term thermal resistance (LTTR) classification per CAN/ULC S770
standard.
Piping and control end pockets are a minimum of 12 inches wide to facilitate piping, auxiliary drain
pan, and service access.
Final finish of the cabinet is cleaned, phosphatized and painted with an electrostatic powder spray
system, with a minimum thickness of 1.5 mil to avoid visible runs and resist abrasion.
Unit Fans
The unit fan board assembly shall ship from the factory wired to the commission schedule for
engineered cfm expectancy. A motor speed switch is on the unit or wall for motor speed
adjustment.
The fan board is a single, rigid construction, made from corrosion resistive material. It is a trouble-
free slide design to provide cleaning and serviceability ease to maintenance personnel.
The fans contain a double width/double inlet, forward curved centrifugal design to sustain
appropriate air throw into the space. The wheels are galvanized metal to resist corrosion. The
dynamically balanced fan and motor are of direct drive style.
The fan and coil arrangement are of a blow-thru configuration to supply unvarying coil face velocity
avoiding cold spots on the coil.
Motors
All motors are brushless DC (BLDC)/electronically commutated motors (ECM) factory-
programmed and run-tested in assembled units. The motor controller is mounted in a touch-safe
control box with a built-in integrated user interface and LED tachometer. If adjustments are needed,
motor parameters can be adjusted through momentary contact switches accessible without
factory service personnel on the motor control board. Motors will soft-ramp between speeds to
lessen the acoustics due to sudden speed changes. Motors can be operated at three speeds or with
a field-supplied variable speed controller. The motor will choose the highest speed if there are
simultaneous/conflicting speed requests. All motors have integral thermal overload protection
UV-PRC003-EN.book Page 87 Tuesday, June 4, 2013 8:59 PM