Roberts Gorden WHA XS User Manual

Combat® UHA[X][S]-Series

Axial Fan Tubular Unit Heaters

Equipment
Specications

1.800.828.7450
www.rg-inc.com

GAS-FIRED UNIT HEATER GUIDE SPECIFICATION

PART 1 GENERAL

Provide gas-red unit heaters, designed and manufactured for

indoor use.

1.1 SECTION INCLUDES

A. Unit Heater

B. Controls

1.2 REFERENCES

A. American National Standards Institute (ANSI) / Canadian
Standards Association (CSA): Establish requirements applicable
to construction, certication and installation of unit heaters.
a. Standard ANSI Z83.8 / CSA 2.6 “Gas Unit Heater and Gas-

Fired Duct Furnaces” (latest edition)
B. IAS: Establishes requirements applicable to construction and
certication of unit heaters.
a. Standard No.10-96 “Unit Heaters for Residential Use”

(latest edition)
C. National Fire Protection Association (NFPA): Establishes re
prevention standards.
a. Article 54: National Fuel Gas Code (latest edition)
b. Article 70: National Electric Code (latest edition)

1.3 SUBMITTALS FOR REVIEW

A. Product Data: Provide data with dimensions, service

connections, accessories, controls, electrical nameplate data and
wiring diagrams.

1.4 PROJECT CLOSEOUT PROCEDURES

A. Training: Provide owner with verbal operating instructions as

well as original manufacturer’s installation, operation and service
manuals.

1.5 QUALITY ASSURANCE

A. Manufacturer Qualications: Company specializing in

manufacturing the products specied in this section (gas­red unit heaters) with a minimum of ten years documented
experience. Equipment shall be the standard product of the
manufacturer and shall have complete catalogued data.

B. Installer Qualications: All installation and service of unit

heaters must be performed by a contractor qualied in the
installation and service of said products with proof of a
minimum of three years documented experience.

C. Factory Testing: Each unit heater shall be factory tested. Testing

shall consist of verication of correct operation of burners,
manifold, control assembly and electrical components.

1.6 REGULATORY REQUIREMENTS

A. Conform to ANSI Z83.8 / CSA 2.6, latest edition, and provide

evidence that the unit heater and its control system have been
found in compliance with these standards by a nationally
recognized testing laboratory.

1.7 WARRANTY

A. e product shall have a manufacturer’s limited warranty of at

least 24 months, subject to the manufacturer’s standard warranty
limitations.

PART 2: PRODUCTS

2.1 MANUFACTURERS

A. COMBAT® by Roberts-Gordon UHA[X][S]-Series

2.2 MANUFACTURED UNITS

A. Unit: Gas-red, power-vented unit heater with tubular heat

exchanger. Units shall have a minimum of 82% thermal
eciency. e standard unit shall consist of a non-separated
combustion design with an aluminized heat exchanger. Design
and heat exchanger alternatives shall be oered as follows:

1. Separated Combustion: A separated combustion unit shall
consist of an enclosed sealed burner box to which
combustion air is vented through a piece of internal exible
air duct. is duct terminates at an exterior cabinet ange to
which a vent run to the outside of the heated space should be
attached.

2. Stainless Steel Heat Exchanger: A stainless steel heat
exchanger unit shall consist of heat exchanger tubes, heat
exchanger tube supports, heat exchanger tube plates and a
vent box produced of 409 stainless steel.

2.3 FABRICATION

A. Casing and Components: Galvannealed steel panels, minimum

20 gauge. All panels shall be lined with a minimum of
3/8"(10mm) thick insulation.

B. Access Door: Door shall be provided for easy service of all

critical components.

C. Finish: Standard nish is a heavy-duty white powder-coat.

D. Louvers: e cabinet shall be equipped with horizontal louvers.

Louvers shall be spring-held and adjustable for directing airow.

2.4 HEAT EXCHANGERS, BURNERS AND GAS TRAIN

A. Heat Exchangers: For Models 30-125, heat exchanger tubes

shall be of a six-pass design with 1.5" (38 mm) outer diameter
[aluminized steel] [409 stainless steel] tube. For Models 150­400, heat exchanger tubes shall be of a four-pass design with

1.75" (44 mm) outer diameter [aluminized steel] [409 stainless
steel] tube. Heat exchangers shall not be clamshell design. For
Models 150-400, the heat exchanger tubes shall be dimpled to
provide ecient heat transfer. e tube plates shall be made of
[aluminized steel] [409 stainless steel]. e tube supports shall
be made of [galvannealed steel] [409 stainless steel].

B. Burners: e burners shall be in-shot type, directly ring each

heat exchanger tube individually. Burners shall be capable of
burning natural gas or LPG.

C. Gas Train: e gas train is constructed of black pipe and includes

a single-stage gas valve. e valve provides the regulator, main
gas and manual shuto functions.