®
Combat UHA[X][S]-Series
Axial Fan Tubular Unit Heaters
Equipment
Specifications
1.800.828.7450
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control terminal shall allow for 2-wire heating control or 4-wire
heating and “fan only” control.
2.5 COMBUSTION AIR AND VENTING COMPONENTS
A. Vent Box: e vent box shall be of [aluminized steel] [409
stainless steel].
2.8 OPTIONS AVAILABLE
B. Flue Fan: Each unit shall have a factory-installed flue fan to draw
combustion gases through the heat exchanger and into the flue
venting. No unit shall be gravity vented. e flue fan shall be
internally mounted by the manufacturer. No combustion draſt
inducers shall be mounted outside of heater cabinet.
(Select Applicable Options)
A. Shelf-Mounting Bracket Kit (Available for Models 30-125 Only):
e shelf-mounting bracket kit shall provide a manner in which
to mount a unit to an existing shelf.
C. Combustion Air: For non-separated units, the combustion
air shall be drawn into the unit's exposed burner box directly
from the heated space through openings in the access door. For
separated units, the combustion air shall be drawn from outside
the heated space into the unit's enclosed burner box through
a piece of flexible duct that terminates at an exterior cabinet
flange. Ductwork shall be run from that flange to the building
penetration.
B. Wall Suspension Mounting Bracket Kit (Available for Models
30-125 Only): e wall suspension mounting bracket kit shall
provide a wall-mounted structure from which a unit can be
suspended.
C. Wall Shelf Mounting Bracket Kit (Available for Models 30-125
Only): e wall shelf mounting bracket kit shall provide a wall-
mounted shelf structure on which a unit can be mounted.
D. Flue and Combustion Air Connections: e flue collar and
combustion air collar (if applicable) shall be located on the rear
of the unit. For Models 30 - 125, heater design shall allow for the
shiſting of the venting and combustion air collars to the top of
the cabinet in the field.
D. Vertical Louver Kit (Available for Models 30-125 Only): e
vertical louver kit shall provide a means to control horizontal air
flow.
E. Concentric Vent Kit: e concentric vent kit allows the flue
and combustion air to be consolidated into a single concentric
vent, thereby minimizing the number of required wall/roof
penetrations. e kit consists of a concentric vent box, a 4" (101
mm)vent terminal with baffle plate and a 6" (152 mm) (Models
30-250) / 8" (203 mm) (Models 300-400) combustion air
terminal.
2.6 AXIAL FAN
A. Fan: Each unit is supplied with one (Models 30-250) / two
(Models 300-400) axial fan(s).
B. Fan Guard: Each axial fan is covered with a fan guard. e
guard shall protect against objects ½" (12 mm) and greater in
diameter.
F. Fuel Conversion Kit: e fuel conversion kit allows for
field-conversion of the type of gas supplied to the unit. e
kit consists of a replacement spring for the gas valve and
replacement orifices.
C. Motor: e motor shall be an open drip-proof (ODP), standard
efficiency design, wired for 120 V/ 1 Ø / 60 Hz. e motor shall
be shaded pole (SP) (Models 30 - 75) / permanent split capacitor
(PSC) (Models 100 - 400).
2.9 PERFORMANCE
2.7 CONTROL SYSTEM
A. Factory Testing: e complete control system and burner
and gas manifold functions shall be factory tested for proper
operation and to simplify field commissioning.
A. See Schedule on plans.
B. Control Enclosure: Burner controls (transformer, ignition
module, gas valve, safety switches) shall be internally
mounted by the manufacturer. No burner controls or gas train
components shall be mounted outside of heater cabinet.
C. Safety Controls:
1. Air Flow Switch: e air flow switch measures air pressure
differential across the heat exchangers to verify blower
operation and the presence of an adequate supply of
combustion air. e gas valve cannot open until the air flow
switch is satisfied.
2. High Temperature Limit Switch: e high temperature limit
switch shall turn the burners off when air is discharged above
its set point. e switch ensures unit shut down in case of
axial fan failure or any problem which may result in
overheating.
D. Controls System: Units shall be equipped for use with 120 V /
1 Ø / 60 Hz power supply. All units shall be factory equipped
with a 24 V thermostat control terminal strip on the outside of
the cabinet, pre-wired to heater internal controls. ermostat
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manufacturer of the vent terminal. Properly support
venting. Penetrations through combustible surfaces
must obey all venting clearances defined by local codes
and heater and venting manufacturers. Vent insulation
recommended depending on vent lengths as indicated by
manufacturer. Condensate drains may be recommended as
indicated by manufacturer.
PART 3: EXECUTION
3.1 INSTALLATION
A. General: Install gas-fired unit heaters as indicated, in
accordance with manufacturer's installation instructions
and in compliance with applicable codes and approvals.
Allow adequate space for combustion air supply, circulation
(axial) fan air supply, servicing or removal of the unit
without disturbing other equipment. For installation at
altitudes above 2,000' (610 m), inform manufacturer at time
of order for appropriate high altitude adjustment and rating
by the manufacturer.
E. Gas Piping: Install gas piping as indicated and in
accordance with NFPA Article 54 National Fuel Gas Code
(latest edition), local requirements and the Installation,
Operation and Service Manual. Gas pressure supply to each
burner shall be as specified by heater manufacturer. For
units running on natural gas, the required gas supply inlet
pressure must be between 5.0 in wc (12.5 mbar) and 14.0
in wc (34.9 mbar). For units running on LPG, the required
gas supply inlet pressure must be between 12.0 in wc (29.9
mbar) and 14.0 in wc (34.9 mbar).
B. Support: Suspend heater, venting, gas piping and conduit
from building substrate as indicated, or if not indicated, in
a manner to provide durable and safe installation; and in
accordance with manufacturer's installation instructions.
Recommended mounting heights shall be measured from
floor level. Models 30 - 45 shall have a recommended
mounting height of 12' (3.7 m). Models 60 - 75 shall have
a recommended mounting height of 15' (4.6 m). Models
100 - 175 shall have a recommended mounting height of
20' (6.1 m). Models 200 - 250 shall have a recommended
mounting height of 25' (7.6 m). Models 300 - 400 shall have
a recommended mounting height of 30' (9.1 m).
F. Electrical Wiring: Install electrical wiring per NFPA
Article 70 National Electric Code (latest edition), local
requirements and the information and wiring diagrams in
the Installation, Operation and Service Manual.
G. ermostat Devices: Where indicated, provide 24 V
thermostat device connected to heater. Mount thermostat
device 5' - 6' (1.5 m -1.8 m) above finish floor or otherwise
as noted on the drawing. ermostat wiring must follow
local codes. Mount wall instruction tag (provided by
manufacturer) at user level near thermostat device.
C. Clearances to Combustibles: Do not impede upon
clearances to combustibles outlined and printed on burner
nameplate, and in manufacturer's product data. Measure
clearances distance from surface of cabinet. Models 30-
125 shall have a rated clearances to combustibles of 0"
(0 cm) below unit and not to exceed 1" (2.54 cm) above
the unit. Models 150-400 shall have a rated clearances to
combustibles of 3" (7.62 cm) below unit and 6" (15.24 cm)
above the unit.
H. Start-Up: Start-up, test, and adjust gas-fired heaters in
accordance with manufacturer's start-up instructions,
and Utility Company's requirements. Check and calibrate
controls, adjust burners, if applicable, according to
manufacturer's instructions for maximum efficiency.
3.2 SCHEDULES
D. Venting: Install vent piping as indicated and per national
and local codes. Terminate where indicated with vent
terminal assembled per instructions supplied by the
A. See plans.
Installation Code and Annual Inspections:
®
All installation and service of ROBERTS GORDON equipment must be performed by a contractor qualified in the installation and
service of equipment sold and supplied by Roberts-Gordon LLC and conform to all requirements set forth in the ROBERTS GORDON
®
manuals and all applicable governmental authorities pertaining to the installation, service and operation of the equipment. To help fa-
cilitate optimum performance and safety, Roberts-Gordon LLC recommends that a qualified contractor conduct, at a minimum, annual
®
inspections of your ROBERTS GORDON equipment and perform service where necessary, using only replacement parts sold and
supplied by Roberts-Gordon LLC.
Further Information: Applications, engineering and detailed guidance on systems design, installation and equipment performance is
®
available through ROBERTS GORDON representatives. Please contact us for any further information you may require, including the
Installation, Operation and Service Manual.
These products (with the exception of the UHA[X][S]30 - 75) are not for residential use.
This document is intended to assist licensed professionals in the exercise of their professional judgment.
Roberts-Gordon LLC
1250 William Street
P.O. Box 44
Buffalo, NY 14240-0044 USA
Telephone: +1.716.852.4400
Fax: +1.716.852.0854
Toll Free: 800.828.7450
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Printed in U.S.A.
UHAESNA
1209 Rev A
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