Catalogue

62 UV-PRC004-EN
Mechanical Specifications
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
with a maximum ambient operating temperature of 104°F and are permanently lubricated. Motors
are capable of starting at 50 percent of rated voltage and operating at 90 percent of rated voltage
on all speed settings. Motors can operate up to 10 percent over voltage.
Drain Pan(s)
The unit drain pan consist of a corrosion resistant, environmentally friendly design to facilitate
condensate removal quickly. It is insulated on the bottom to prevent sweating. The pan is
removable for cleaning. The drain connection is easy for the field to reverse to the opposite end.
Hydronic Coils (option)
All hydronic coils are plate-fin type, mechanically bonded to tubes. The coils are hydrostatically
tested to 350 psi and burst tested to 450 psi. The coils are rated in accordance with AHRI-440 or 220.
A threaded drain plug is provided at the header’s lowest point, and a manual air vent provided at
its highest point.
The standard four-pipe heating coil is in the preheat location. Optional four-pipe heating coils have
the heating coil in the reheat position for dehumidification control.
Refrigerant Coils (option)
Direct expansion coils contain copper tubes mechanically expanded into evenly spaced aluminum
fins. All coils are proof and leak tested before leaving the manufacturer. The proof test is performed
at 1.5 times the maximum operating pressure, and leak tested at the maximum operating pressure.
In addition, the tubes are completely evacuated of air to check for leaks in the vacuum.
The refrigerant coil distributor assemblies Venturi or orifice style with round copper distributor
tubes.
Distributors are sized consistently with capacity of coil. Suction headers are fabricated from round
copper pipe.
A thermostatic expansion valve (TXV) are factory selected and installed for a wide-range of control
to maintain optimum control of superheat.
Refrigerant access ports are factory supplied on high and low side for ease of refrigerant pressure
or temperature testing. All coils are shipped with a dry-nitrogen charge.
Electric Coil (option)
Units equipped for electric heat have a special resistance heating element design inserted in an
extended surface fin-tube bundle for maximum element life and safety. Units specifying electric
heat include (as standard) a high temperature cut out with a continuous sensing element. This
device interrupts electrical power whenever excessive temperatures are sensed anywhere along
the leaving side of the coil. A contactor is included to ensure positive disconnect of electrical power
whenever the fan motor power is interrupted. A dead front switch disconnects power to the unit
when the access panel is opened. All electric heat units have a power wiring console in the right
hand end-pocket to facilitate field wiring of the unit.
Steam Coil (option)
Units including a steam coil are of a a 5/8-inch, sigma-flow, tube-in-tube, distributing coil design.
Steam coil tubing is mechanically expanded into evenly spaced aluminum fins. The supply and
return connections are on the same side, and include a 1 inch female pipe thread (FPT) termination.
The coil is pitched by the manufacturer to provide condensate drainage.
UV-PRC004-EN.book Page 62 Monday, February 4, 2013 11:01 AM