CRV-SERIES DESIGN MANUAL

5.2 Pump Capacity

The flow unit capacity of the pump is indicated on Page 14, Table 2, as a function of installed altitude. When the CRV-Series system is designed in accor- dance with this set of instructions and is in proper operating condition, a vacuum from 2-3" w.c. will be obtainable at each end vent (i.e. at all burners).

number of flow units carried in the tube.

See Figure 15. Readings for length and flow when plotted on the graph must fall on OK side to avoid excessive vacuum losses.

FIGURE 15: Vacuum Loss Curve for 4" Shared

Tailpipe

Table 2: Pump Capacity

Installed Altitude

Maximum Flow Units

 

 

 

 

 

Feet Above

Meters Above

EP-100

EP-200

EP-300

Sea Level

Sea Level

Series

Series

 

 

 

 

 

 

0' - 2000'

0 m - 609 m

66

112

224

 

 

 

 

 

2001' - 3000'

610 m - 914 m

63

105

215

 

 

 

 

 

3001' - 4000'

915 m - 1219 m

60

100

206

 

 

 

 

 

4001' - 5000'

1220 m - 1524 m

57

95

197

 

 

 

 

 

5001' - 6000'

1525 m - 1828 m

54

90

188

 

 

 

 

 

6001' - 7000'

1829 m - 2134 m

51

84

180

 

 

 

 

 

7001' - 8000'

2135 m - 2438 m

48

80

170

 

 

 

 

 

8001' - 9000'

2439 m - 2743 m

45

75

161

 

 

 

 

 

There are a number of design requirements which, if not met, will reduce the vacuum obtainable and thereby the effective flow capacity of the pump. These include:

•Minimum Length of Tailpipe - If less than the minimum length of tailpipe is provided per radiant branch, there will be insufficient cooling of the com- bustion gases and improper operation of the pump.

•Line Loss Check for Tailpipe is applicable to sections of tailpipe which are common to two or more radiant branches (i.e. shared lengths). See Page 14, Figure 15.

•Excessive back pressure on discharge line of pump can be caused by partial blockage or too much flow for length. See Section 5.3.1

•More than maximum number of burners or flow units per radiant branch. See Page 14, Table 2.

•Excessive number of elbow or tee fittings which increases vacuum loss.

5.3 Tailpipe Flow

Excessive flow loading in a single section of tailpipe can cause low vacuum and lower effective pump capacity. For the pump to develop the proper vacuum, the length of tailpipe must not be excessive for the

NOTE: For 6" (15 m) tailpipe, length is limited to a maximum of 100’ (30 m). See Page 16, Section 6.3 for more details.

Lengths shown include allowance for 1 elbow every 50' (15 m); deduct 15% of length for each additional elbow used per 50' (15 m) length.

5.3.1 Pump Exhaust Length Requirements

The tube length on the exhaust side of the pump is considered excessive if not within the following condi- tions:

Table 3: Pump Exhaust Requirements

Pump Series

Exhaust Tube Length

Exhaust Tube Diameter

 

 

 

EP-100

Up to 25' (7.6 m)

4" 3 Elbows

 

 

 

EP-100

Up to 50' (15 m)

5" 3 Elbows

 

 

 

EP-200

Up to 10' (3 m)

4" 0 Elbows

 

 

 

EP-200

Up to 25' (7.6 m)

5" 3 Elbows

 

 

 

EP-200

Up to 50' (15 m)

6" 3 Elbows

 

 

 

EP-300

Up to 10' (3 m)

6" 1 Elbows

 

 

 

EP-300

Up to 25' (7.6 m)

7" 3 Elbows

 

 

 

EP-300

Up to 50' (15 m)

8" 3 Elbows

 

 

 

14

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Roberts Gorden CRV-B-9 service manual Pump Capacity, Tailpipe Flow, Pump Exhaust Length Requirements
Page 19 Page 21

CRV-B-9 specifications

The Roberts Gordon CRV-B-9 is a state-of-the-art infrared radiant heater designed for industrial and commercial heating applications. Renowned for its efficiency and effectiveness, the CRV-B-9 represents a significant advancement in the world of space heating solutions.

One of the main features of the CRV-B-9 is its advanced infrared technology, which allows for precise heating without the necessity of warming the entire space. This targeted heating provides immediate comfort, as it directly warms objects and people rather than the air around them, making it particularly effective in large warehouses, manufacturing facilities, and retail spaces.

The heater boasts an impressive output of up to 80,000 BTUs, making it suitable for a wide range of applications. It utilizes natural gas as fuel, which contributes to its efficiency and cost-effectiveness. With a robust design and durable construction, the CRV-B-9 is built to withstand the rigors of industrial environments while ensuring a long product lifespan.

Another significant characteristic of the CRV-B-9 is its ability to integrate with advanced control systems. This includes compatibility with programmable thermostats and energy management systems, allowing for optimized temperature control and reduced energy consumption. The heater can be adjusted to suit different operational needs, making it a flexible solution for various heating scenarios.

The CRV-B-9 also features a compact design, allowing for easy installation in a variety of spaces. Its low-profile shape and modular capability enable users to arrange multiple units to achieve the desired heating coverage without compromising floor space, a crucial aspect for busy, high-traffic areas.

Safety is a priority with the CRV-B-9, which is equipped with various safety features such as a flame safety cutoff switch and over-temperature protection. These mechanisms ensure safe operation, providing peace of mind for users in demanding environments.

In summary, the Roberts Gordon CRV-B-9 infrared radiant heater stands out for its innovative technology, impressive output, energy efficiency, and safety features. Its flexibility and robust design make it an ideal choice for businesses looking to enhance comfort while minimizing energy costs. Whether in a manufacturing plant or a retail outlet, the CRV-B-9 provides a reliable and effective heating solution.
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