Submittal Sheet

The cabinet shall be low prole with a pre-coat or powdercoat RAL 1001 white paint nish. Finish shall be a
minimum 80 gloss on G30 galvanized steel. The heat exchanger/control compartment cabinet shall be con-
structed so that screws are not visible from the bottom, front, or sides, except for service panel and accesso-
ries. Cabinet shall have a beveled front corner on the control side for additional cabinet rigidity.
The unit shall be designed for ceiling suspension featuring 3/8”-16 female threads (hanger kits for 1” pipe) at
4-point locations.
The cabinet shall be equipped with RAL 3005 burgundy painted, roll-formed horizontal louvers (duct ange).
Louvers shall be spring held and adjustable for directing airow. (Vertical louvers) (downturn nozzles) (down-
turn nozzles with vertical louvers) shall be available.
The unit shall be designed with a full opening service access panel complete with captive screw closure attach-
ment and lifting handle for removal. Service panel shall be fully gasketed and equipped with a safety interlock
switch. All components in the gas train, all standard electrical controls, and the power venter shall be within the
sealed service compartment.
Minimum top clearance from combustibles shall be 6” (152mm) for Size 30,000-125,000 BTUH units and 14”
(356mm) for Size 150,000-400,000 BTUH units. Minimum bottom clearance from combustibles shall be 1”
(25mm) for all size units. Minimum clearance on accessside shall be 18” (457mm) for all sizes. Minimum
clearance on non-accessside shall be 24” (610mm) for all sizes. Minimum rear clearance for all sizes is 18”
(457mm).
All sizes shall be design certied by the Canadian Standards Association to ANSI Z83.8 and CSA 2.6 for com-
mercial/industrial installation.
Manufacturer must have a minimum of 50 years experience in the manufacture of gas red unit heaters.
Cabinet
Certications
SampleSpecications
ModelUDBS(cont'd)
SampleSpecications
Model UDAP
Provide (82%, 83%) high-efciency, power vented, gas-red unit heaters manufactured as Reznor
®
brand
units designed for use in building areas where higher reliability is required and venting is either vertical or
horizontal.
Each of the 14 sizes in the Model UDAP 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 fan overrun settings, and a relay for fan only operation. All
units shall be equipped with a safety limit switch.
All controls shall be enclosed in the unit housing to protect them from accidental damage that could be caused
by factors in the building that would adversely affect external controls.
The unit shall have a factory-installed power venter device to draw combustion air through an inlet in the rear
of the cabinet.
The combustion air/venting system shall include a vibration isolated power venter motor and wheel assembly
and a combustion air pressure switch. Unit Sizes 30-125 shall include a ame rollout switch. (The unit shall be
equipped with an approved common vent option to allow venting with another gravity vented Category I gas
appliance).
(A vent cap shall be available.)
GAS-FIRED, POwER VENTED
UNIT HEATERS
Fuel
HeatExchanger
Burner
Controls
CombustionAirandVenting
Form RZ-C-UH (Version H) Page 49
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