87%-Efficiency Boilers – Special Instructions

NOTE: The constructions of the 84%- (standard) and 87%-efficiency (optional) boilers are very similar, and they are installed to the same requirements, except as noted in this section.

Water Piping

An 87%-efficiency boiler requires a minimum inlet water temperature of 120ºF (49ºC) to prevent exces- sive condensation in the combustion chamber. An 87%-efficiency boiler operated with an inlet tempera- ture of less than 120ºF (49ºC) must have a manual bypass or an approved low-temperature operation system to prevent problems with condensation. A man- ual bypass, shown in Fig. 15, must be piped into the system at the time of installation. This piping is like a primary/secondary boiler installation with a bypass in the secondary boiler piping. Raypak strongly recomm-

ends that a thermometer be placed into the boiler inlet piping next to the in/out header to facilitate tempera- ture adjustment. Inlet water temperatures below 120ºF (49ºC) can excessively cool the products of combus- tion, resulting in condensation on the heat exchanger.

Venting

CAUTION: Proper installation of flue venting is criti- cal for the safe and efficient operation of the boiler.

Appliance Categories

See Table P for appliance category requirements for the 87%-efficiency Hi Delta.

NOTE: For additional information on appliance categorization, see appropriate code NFGC (U.S.) and B149 (Canada), or applicable local building codes.

Model

20°F

T

30°F

T

40°F

T

Min. Flow

 

Max Flow

 

No.

gpm

 

P (ft)

gpm

 

P (ft)

gpm

 

P (ft)

gpm

P (ft)

T

gpm

P (ft)

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

992BE

86

 

5.6

57

 

2.5

43

 

1.4

43

1.4

40

132

13.1

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1262BE

110

 

10.3

73

 

4.6

55

 

2.6

55

2.6

40

132

14.8

17

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1532BE

132

 

16.5

89

 

7.6

67

 

4.3

67

4.3

40

132

16.5

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1802BE

N/A

 

N/A

104

 

11.5

78

 

6.5

78

6.5

40

132

18.3

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2002BE

N/A

 

N/A

116

 

14.8

87

 

8.5

87

8.5

40

132

19.0

26

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2072BE

N/A

 

N/A

120

 

15.8

90

 

9.1

90

9.1

40

132

19.0

27

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2342BE

N/A

 

N/A

N/A

 

N/A

102

 

12.9

102

12.9

40

132

21.4

31

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note: Basis for minimum flow is 40°F ΔT. Basis for maximum flow is 132 gpm.

Table O: Heater Rate of Flow and Pressure Drop

Combustion

Exhaust

Heater Venting

Certified

Combustion Air

Air Supply

Configuration

Category

Materials

 

Inlet Material

 

 

 

 

 

 

 

Vertical Natural Draft

II

AL29-4C

 

 

From Inside Building

Venting

 

 

 

Stainless Steel

 

 

(Non-Direct Venting)

Horizontal Through-

 

 

 

IV

(Gas Tight)

 

 

 

 

 

 

the-Wall Venting

 

 

 

 

 

 

 

 

 

Vertical Natural Draft

II

AL29-4C

Galvanized Steel

From Outside Building

Venting

 

PVC

 

Stainless Steel

 

(Direct Venting)

Horizontal Through-

 

 

ABS

IV

(Gas Tight)

 

 

 

CPVC

 

the-Wall Venting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table P: Category Determination for Venting Purpose and Venting Arrangement

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Raypak 992B manual 87%-Efficiency Boilers Special Instructions, Water Piping, Venting Appliance Categories
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992B specifications

The Raypak 992B is a highly regarded commercial boiler known for its efficiency and reliability in heating applications. Designed for a range of installations, it is particularly favored in schools, hotels, and various commercial settings where dependable heating is crucial. One of the standout features of the Raypak 992B is its impressive thermal efficiency rating, often exceeding 90%. This efficiency translates into lower energy costs and reduced environmental impact, making it a smart choice for eco-conscious businesses.

The Raypak 992B comes equipped with advanced technologies that enhance performance and ease of use. Among these technologies is the high-precision digital control system, which allows for accurate temperature regulation and monitoring. This feature ensures optimal performance and minimizes energy waste, further contributing to the unit's cost-effectiveness. The boiler also utilizes a modulating burner system, enabling it to adjust flame size based on real-time heating demands. This adaptability not only enhances efficiency but also improves overall comfort within a facility.

Another significant characteristic of the Raypak 992B is its robust construction. Built with durable materials designed to withstand demanding operating conditions, this boiler is engineered for long-lasting performance. Its compact design is an added benefit, facilitating installation in areas with limited space. The unit is also equipped with a stainless steel heat exchanger, which provides superior resistance to corrosion and enhances heat transfer efficiency.

Safety features are also paramount in the design of the Raypak 992B. The boiler includes multiple safety controls and alarms to prevent overheating and maintain safe operating conditions. This diligence in safety ensures peace of mind for operators and reduces the risk of unexpected downtime.

In summary, the Raypak 992B stands out as a top choice for commercial heating solutions, combining high efficiency, advanced technology, and rugged construction. Its features cater to a wide range of heating needs while prioritizing safety and economy. With its impressive performance capabilities, the Raypak 992B continues to be a reliable partner for facilities seeking optimal heating solutions.
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