Brochure
Reznor
®
V3 Series Model UDBS gas-red separated combustion unit heaters are available in 14 sizes ranging
from 30,000 to 400,000 BTUH gas input. Model UDBS heaters are designed for 82-83% thermal efciency
and are approved for commercial/industrial installations in the United States and Canada by the Canadian
Standards Association (CSA).
Reznor V3 Series unit heaters have a refreshing new appearance with a glossy white cabinet nish and less
visible hardware. Each size cabinet is easily suspended from four suspension points. The low voltage terminal
strip on the outside of the cabinet makes connecting control wiring easy with no panels to remove. The addition
of a “G” terminal to the low voltage strip, along with the new design of the circuit board, allows for blower only
operation (without adding relays). All units have a factory installed gas line nipple to the exterior of the cabinet
for easy gas service connection.
The preeminent new internal feature is the T
core
2
heat exchanger and single burner combustion system. Other
standard features include a single-stage gas valve, multi-try direct spark ignition with timed lockout, pressure
switch to verify vent ow, resiliently isolated venter motor, venter wheel with improved housing, a high tem-
perature limit control, interlock door switch, and a built-in disconnect switch. Sizes 30-125 are equipped with a
centrifugal blower and direct drive motor with multispeed taps. Sizes 30 and 45 are capable of handling up to
.5” w.c. of external static pressure; Sizes 60-125 will handle up to .75” w.c. of external static pressure. Sizes
150-400 are equipped with a centrifugal blower with an adjustable belt drive and motor. All units are designed
for use with optional 30° and 60° downturn nozzles with horizontal and vertical louvers. Operation is controlled
through an integrated circuit board. The circuit board monitors heater operation and has LED diagnostic indica-
tor lights to identify abnormalities in control functions.
The 1
ST
everseparatedcombustion system in the commercial/industrial heating industry wasintroduced
on a Reznor heater in the 1960s, and that proven technology is continued in this new separated combustion
product. Model UDBS separated combustion units require installation of a specially designed combustion air/
vent system including the unique concentric adapter box that allows for only one building penetration for both
the vent and combustion air.
The V3 Series unit heaters are designed to provide all the features you expect in a Reznor heater plus im-
proved efciency, easier installation, and a new look ~ both inside and out. Look for the unique white unit
with no visible front and bottom hardware, deep red louvers, black side handle, and angled corner to know you
have a genuine Reznor heater.
● Certied for commercial/industrial heating applications
● 82-83% Thermal efcient ~ TOP in its class!
● 45-75°F Rise range - Sizes 30-350 50-80°F Rise range - Size 400
●
Tcore
2
titanium stabilized aluminized steel heat exchanger
● Patented
A
single burner combustion system including a one-piece burner assembly
● 115/1/60 Supply voltage
● 115 Volt open dripproof blower motor with internal overload protection - Sizes 30-125
● 115 Volt open dripproof blower motor with internal overloads and denite purpose motor contactor - Sizes
150-400
● Direct drive blower with multispeed taps - Sizes 30-125
● Adjustable belt drive blower - Sizes 150-400
● Transformer for 24-volt controls
● Integrated circuit board with diagnostic indicator lights
● Blower relay (included on the circuit board)
● Multi-try direct spark ignition with timed lockout
● Single-stage natural gas valve (eld adjustable for operation to 9,000 ft. elevation
)
● Vibration/noise isolated venter motors
● Sealed compartment houses all electrical components
● 4-pt Suspension
● Built-in disconnect switch - Sizes 30-125, 20A@115V rating; Sizes 150-400 30A@115V rating
● External terminal strip for 24-volt wiring
● Sealed junction box for supply wiring
● External gas connection
● Fully gasketed door panel with safety door switch
● Improved cabinet design with less visible hardware
DESCRIPTION
STANDARD FEATURES
SeparatedCombustion,HighStaticBlowerTypeUnitHeatersfor
Commercial/IndustrialUse
ANSI Z83.8bCSA 2.6b
Model UDBS
A
U.S. Patent No. 6,889,686
Form RZ-C-UH (Version H) Page 11
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