Roberts Gorden CRV-B-4 Manual Do Utilizador

16 

When designing branches of 4 B-8 or larger burners 
in-series, the following limitation to the pump capacity 
applies:

EP-100:Not Allowed

EP-200:1 Branch of 4 burners

EP-300:2 Branches of 4 burners

For systems that are designed above 90% pump 
capacity, the following limitations of shared tailpipe 
apply:

• 4" (10 cm) tailpipe: limited to maximum of 2 com-

bined branches and length limited to maximum of 
20' (6 m). See Page 14, Figure 15 for all other 
tailpipe considerations.

• 6" (15 cm) tailpipe limited to maximum of 4 com-

bined branches and length limited to maximum of 
100' (30 m). 

• When calculating required tailpipe length 1' (.3 m) 

of 6" manifold tube is equivalent to 1.3' (.4 m) of 4" 
tailpipe.

Failure to comply with the above parameters will result 

in insufficient vacuum to burners.

1. Layout the system to suit the BTU input 

required.

2. Calculate the system design for each branch 

individually.

3. Calculate the number of flow units per branch of 

burners. Add the flow units for each branch 
together to get the total system flow units. See 
Page 12, Table 1 for the rules for each burner 
model. See Page 13, Figure 14 for example flow 
unit calculations.

3.0

2.5

2.0

1.5

1.0

83%

84%

85%

86%

87%

88%

89%

90%

NOTE: Thermal efficiency values shown do not include the contribution due to condensing conditions when 
operating in cyclic fashion. To estimate cyclic efficiencies, add 2-3% to the values obtained from the graph.

Branch 1

+

Branch 2

+

Branch 3

+

Branch 4

+

Branch 5

+

Branch 6

+

Total System 
Flow Units =