Roberts Gorden CRV-B-4, CRV-B-8, CRV-B-6, CRV-B-2 service manual After Each Burner

SECTION 6: RADIANT TUBE AND TAILPIPE

4.Select pump model series for total system flow units:

EP-100: up to 66 flow units

EP-200: up to 110 flow units

EP-300: up to 224 flow units

5.See Page 14, Table 2 for altitudes greater than 2000'.

6.For each branch, add the length of radiant tube

after each heater:

Burner	Radiant Tube Length
	After Each Burner
1	+
2		+
3		+
4		+
5		+
6		+

Total Radiant Tube

Length in Branch =

Repeat this calculation for each branch in the system.

7.Divide the total radiant tube length in the branch by the number of burners in the branch to get the average radiant length per burner.

Average Radiant

Length Per Burner =

Repeat this calculation for each branch in the system.

8.Using the average radiant length per burner (Calculated in Step 7) See Page 17, Table 4 to select the allowable tailpipe lengths per flow unit.

Table 4: Allowable Tailpipe Lengths

				Burner Model
	B-2	B-4	B-6		B-8	B-9	B-10	B-12/B-12A
Radiant Tube Length (average distance between burners)
Minimum (ft)	10	12.5	20		20	20	30	35
Recommended (ft)	15	20	25		30	30	40	50
Maximum (ft)	20	25	35		45	50	60	70
Tailpipe length per flow unit
Minimum (ft)*	1.2	1.2	1.2		1.2	1.2	1.2	1.2
Recommended (ft)	1.5	1.5	1.5		1.5	1.5	1.5	1.5
Maximum (ft)	2.5	2.5	2.5		2.5	2.5	2.5	2.5
Maximum (ft) for EP-100 only	1.7	1.7	1.7		1.7	1.7	1.7	1.7

*Minimum tailpipe lengths can only be used if radiant tube length is recommended or greater.

17