Roberts Gorden Gas Heater WHA XS Series User Guide

®
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  
© 2009 Roberts-Gordon LLC All rights reserved. No part of this work covered by the copyrights herein may be reproduced or copied in any form or  
by any means – graphic, electronic, or mechanical, including photocopying, recording, taping, or information storage  
and retrieval systems – without written permission of Roberts-Gordon LLC.  
Printed in U.S.A.  
UHAESNA  
1209 Rev A  
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