Brochure

Unit(s) shall be design certied by the Canadian Standards Association to ANSI Z83.8b and CSA 2.6b for com-
mercial/industrial installation.
(Model sizes 30, 45, 60, 75, 100 and 125 MBH shall be certied to CSA International Requirement 10-96 - U.S.,
CR96-0005 - Canada for use in attached residential garage.
Manufacturer must have a minimum of 50 years experience in the manufacture of gas red unit heaters.
Certications
SampleSpecications
ModelUDAS(cont'd)
Provide (82%, 83%) high-efciency, separated-combustion, power vented, gas-red unit heaters manufactured
as Reznor
®
brand units. The unit shall be designed for use in a building with negative pressures up to
0.15 “ w.c. and for use in building where a non-explosive atmosphere exist that is dust laden and/
or contains mildly corrosive fumes.
Each of the 14 sizes in the Model UDBS series shall be equipped for use with (natural) (propane) gas. Gas
connection shall be external to the cabinet.
The heater shall be equipped with a multi-cell, 4 pass serpentine style steel heat exchanger. Heat exchanger
tubes shall be press fabricated of (titanium stabilized, corrosion resistant aluminized steel) (409 stainless steel)
(316 stainless steel). All heat exchangers shall be fabricated with no welding or brazing, only tool pressed
mechanical joints. All heat exchanger cells shall be designed with an aerodynamic cross section to provide
maximum airow.
The units shall incorporate a single, one piece burner assembly with a single orice. The burner shall have a
continuous wound close pressed stainless steel ribbon separating the ame from the burner interior. All units
shall have a single venturi tube and orice supplying fuel to a one-piece burner housing. Each heat exchanger
cell shall use balanced draft induction to maintain optimum ame control.
Controls shall include a (single-stage) (two-stage) gas valve; direct spark multi-try ignition with electronic ame
supervision with timed lockout integrally controlled via a printed circuit control board. The control board shall
also incorporate diagnostic lights, DIP switches for blower overrun settings, and a relay (denite purpose 3 pole
contactor) for blower only operation. All open (TEFC) blower motors shall have automatic thermal overload
protection or be equipped with a factory installed motor starter with adjustable thermal overloads. All units shall
be equipped with a safety limit switch.
All controls shall be enclosed in the sealed control compartment to protect them from accidental damage, dust,
and atmospheric corrosion.
The unit shall have a factory-installed power venter device to draw combustion air from outside of the building.
The outside air shall enter the unit through a factory-installed round inlet air terminal on the rear of the heater.
The control compartment shall be sealed and the access door shall be gasketed to prevent dirt, lint, dust, or
other contaminants present in the heated space from entering the unit. The control compartment door shall be
equipped with a safety interlock switch to prevent operation when the door is open.
The combustion air supply pipe and ue exhaust pipe shall be run in parallel from the heater to a factory sup-
plied concentric adapter assembly, which allows for a single wall or roof penetration, to the (horizontal) (verti-
cal) air inlet and vent terminal.
The combustion air/venting system shall include a vibration isolated power venter motor and wheel assembly
and a combustion air pressure switch.
Operation shall be controlled by an integrated circuit board that includes LED diagnostic indicator lights. Supply
voltage connections shall be made in a sealed junction box. 24-volt control connections shall be made on an
externally mounted terminal strip with connections W1, W2, R, and G. All internal wiring, both line and control
voltages, shall be terminated by insulated terminal connectors to minimize shock hazard during service.
Units shall be equipped with a 115V power supply (Stepdown transformers shall be available to be eld in-
stalled for use with a (208) (230) (460) volt power supply.)
All units will be equipped with a suitably rated, factory installed built-in disconnect switch.
Size 30,000-125,000 BTUH units shall be equipped with a centrifugal blower with direct drive from an open
dripproof motor with internal overloads. Size 30,000 and 45,000 BTUH units must be able to handle .5” w.c. of
external static pressure. Size 60,000-125,000 BTUH units must be able to handle .75” w.c. of external static
pressure. (Size 30,000-125,000 BTUH units may be equipped with a blower inlet guard.)
Size 150,000-400,000 BTUH units shall be equipped with a centrifugal blower and adjustable belt drive and
an (open dripproof) (totally enclosed) blower motor with internal overloads. Size 150,000-400,000 BTUH units
must be able to handle .5” w.c. of external static pressure. (Size 150,000-400,000 BTUH units may be equipped
with an OSHA-type belt guard and blower inlet guard.)
GAS-FIRED, SEPARATED
COMBUSTION UNIT HEATERS
Fuel
HeatExchanger
Burner
Controls
CombustionAirandVenting
Electrical
Blower
SampleSpecications
Model UDBS
Form RZ-C-UH (Version H) Page 48
Page Number _______ of ______