Roberts Gorden WHA XS Series manual Part 1 General, Part 2 Products

GAS-FIRED UNIT HEATER GUIDE SPECIFICATION

PART 1 GENERAL

Provide gas-fired unit heaters, designed and manufactured for indoor use.

1.1SECTION INCLUDES

A. Unit Heater B. Controls

1.2REFERENCES

A.American National Standards Institute (ANSI) / Canadian Standards Association (CSA): Establish requirements applicable to construction, certification 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 certification of unit heaters.

a.Standard No.10-96 “Unit Heaters for Residential Use” (latest edition)

C.National Fire Protection Association (NFPA): Establishes fire prevention standards.

a.Article 54: National Fuel Gas Code (latest edition)

b.Article 70: National Electric Code (latest edition)

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-fired, power-vented unit heater with tubular heat exchanger. Units shall have a minimum of 82% thermal efficiency. The standard unit shall consist of a non-separated combustion design with an aluminized heat exchanger. Design and heat exchanger alternatives shall be offered 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 flexible air duct. This duct terminates at an exterior cabinet flange 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.

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 Qualifications: Company specializing in manufacturing the products specified in this section (gas- fired 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 Qualifications: All installation and service of unit heaters must be performed by a contractor qualified 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 verification 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

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 finish is a heavy-duty white powder-coat.

D.Louvers: The cabinet shall be equipped with horizontal louvers. Louvers shall be spring-held and adjustable for directing airflow.

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 150- 400, 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 efficient heat transfer. The tube plates shall be made of [aluminized steel] [409 stainless steel]. The tube supports shall be made of [galvannealed steel] [409 stainless steel].

B.Burners: The burners shall be in-shot type, directly firing each heat exchanger tube individually. Burners shall be capable of burning natural gas or LPG.

C.Gas Train: The gas train is constructed of black pipe and includes a single-stage gas valve. The valve provides the regulator, main gas and manual shutoff functions.

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