Roberts Gorden CRV-B-2 Crv-Seriesequipment Specifications, Burner and Burner Controls, Pump

CRV-SERIES DESIGN MANUAL

SECTION 11: CRV-SERIES EQUIPMENT SPECIFICATIONS

The total heating system supplied shall be design cer- tified by the CSA International per American National Standard ANSI Z83.20/CSA 2.34 (latest edition).

11.1 Burner and Burner Controls

11.1.1Burners shall be designed to operate simulta- neously in series without adverse effects from com- bustion gases from upstream burners.

11.1.2Burners shall be capable of firing on:

Natural Gas, or LP Gas.

11.1.3Burners shall be supplied to fire at any one of the input firing rates as specified:

CRV-B-2-20,000 (Btu/h)

CRV-B-4-40,000 (Btu/h)

CRV-B-6-60,000 (Btu/h)

CRV-B-8-80,000 (Btu/h)

CRV-B-9-90,000 (Btu/h)

CRV-B-10-100,000 (Btu/h)

CRV-B-12A-110,000 (Btu/h)

CRV-B-12-120,000 (Btu/h)

When using ROBERTS GORDON® ULTRAVAC™ con- trols, burner rates will modulate between 60% and 100% rated input (CRV-B-2 and CRV-B-4 are not avail- able for use with ROBERTS GORDON® ULTRAVAC™ controls).

11.1.4The design of burners supplied shall provide for maintaining a constant proportion of fuel gas to fil- tered combustion air. These conditions are met for burners in which the pressure of both the fuel gas and the combustion air are introduced at zero (atmo- spheric) pressure and the flow of each is established by a vacuum on the downstream side of the flow metering orifices.

11.1.5To assure a high degree of fail-safe operation, the design shall preclude flow of gas if any or all of the following abnormal conditions occur in the non- firing mode:

1.Main valve fails in open position.

2.Vacuum pump motor fails to operate.

3.Power fails.

11.1.6To further assure a high degree of safety, the system will be under negative pressure at all times during operation to preclude the possibility of the escape of combustion gases inside the building.

11.1.7The burner control assembly will include a zero regulator.

11.1.8All burners shall be pre-wired with a grounded electrical cord and plug.

11.2Equipment 11.2.1 Burner

Each burner assembly shall consist of heavy-duty cast-iron burner heads, pre-wired gas controls with electronic, three-try direct spark ignition and combus- tion air filter.

11.2.2 Pump

The pump model supplied will vary with the capacity of the system. See the pump technical specification sheet or the installation, operation and service manual for product description and specification.

The pump shall be acoustically isolated from the sys- tem with a flexible connector with temperature rating of 350°F minimum. The motor in the vacuum pump shall be secured with rubber mounts for acoustical isolation.

11.2.3 Heat Exchanger

Radiant tubing (between burners and 10’ - 70’ down- stream of last burner) shall be of 4" O.D. steel or heat treated aluminized tubing.

As an option, the balance of the tubing shall be 4" O.D. steel tubing with an internal and external coating of acid-resistant porcelain.

All heat exchanger (tubing) connections shall be made with stainless steel coupling assemblies. Standard couplings will be used in radiant sections. Lined cou- plings will be used in tailpipe sections.

11.2.4 Outside Air

When specified, in contaminated environments, the system shall be capable of supplying air from the out- side to each burner and end vent for the support of combustion.

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