Roberts Gorden CRV-B-8 Manual Do Utilizador

32 

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).

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

11.1.2 Burners shall be capable of firing on: 
Natural Gas, or LP Gas.

11.1.3 Burners 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).

11.1.4 The 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.

11.1.5 To 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.

11.1.6 To 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.

11.1.7 The burner control assembly will include a zero 
regulator.

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

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.

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.

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. 

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.