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 Q for appliance category requirements for the 87%-efficiency Hi Delta.

NOTE: For additional information on appliance cat- egorization, see appropriate code NFGC (U.S.) and B149.1 (Canada), or applicable local building codes.

 

Model

10°F

T

20°F

T

30°F

T

Min. Flow

 

Max Flow

 

 

 

No.

gpm

 

P (ft)

gpm

 

P (ft)

gpm

 

P (ft)

gpm

P (ft)

T

gpm

P (ft)

T

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

302AE

52

 

3.3

26

 

<1.0

N/A

 

N/A

20

<1.0

26

90

9.8

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

402AE

69

 

6.0

35

 

1.5

23

 

<1.0

20

<1.0

35

90

10.0

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

502AE

87

 

9.7

44

 

2.5

29

 

1.1

22

<1.0

40

90

10.4

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

652AE

N/A

 

N/A

57

 

4.4

38

 

2.0

28

1.1

40

90

10.8

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

752AE

N/A

 

N/A

65

 

6.1

44

 

2.8

33

1.6

40

90

11.3

15

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

902AE

N/A

 

N/A

78

 

8.9

52

 

4.1

39

2.3

40

90

11.7

17

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note: Basis for minimum flow is 20 gpm or 40°F ΔT. Basis for maximum flow is 90 gpm.

Table P: 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

Stainless Steel

 

 

 

 

From Inside Building

Venting

(Gas Tight)

 

 

 

 

 

 

 

 

 

(Non-Direct Venting)

Horizontal Through-

IV

AL29-4C

 

 

 

 

 

 

 

 

 

 

the-Wall Venting

 

 

 

 

 

 

 

 

 

 

 

 

Vertical Natural Draft

II

Stainless Steel

Galvanized Steel

 

 

From Outside Building

Venting

(Gas Tight)

 

PVC

 

 

 

 

 

 

(Direct Venting)

Horizontal Through-

IV

AL29-4C

 

ABS

 

 

 

 

 

 

 

the-Wall Venting

 

CPVC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table Q: Category Determination for Venting Purpose and Venting Arrangement

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Raypak 302A-902A manual 87%-Efficiency Boilers Special Instructions Water Piping, Venting Appliance Categories
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302A-902A specifications

The Raypak 302A-902A is a highly regarded pool and spa heater, known for its efficiency and reliability in delivering warmth to residential and commercial aquatic applications. This heater stands out due to its robust design, advanced technology, and user-friendly features.

One of the key characteristics of the Raypak 302A-902A is its dual fuel capability, which means it can run on either natural gas or propane. This flexibility allows users to choose their preferred fuel type, contributing to operational efficiency and cost-effectiveness. With a BTU output ranging from 302,000 to 902,000, the Raypak heater is capable of quickly heating large volumes of water, making it ideal for pools, spas, and hot tubs.

The heater incorporates advanced technology such as a stainless steel heat exchanger, which not only ensures excellent thermal conductivity but also promotes durability against corrosion. This is especially advantageous in harsh environments, where exposure to chemicals can significantly impact the lifespan of traditional copper heat exchangers. The Raypak 302A-902A's heat exchanger is designed to withstand the rigors of constant use while maintaining high performance levels.

Another prominent feature of the Raypak 302A-902A is its digital display control system, which simplifies the operation and monitoring of the heater. Users can easily set and adjust temperatures, as well as access diagnostic information, all through an intuitive interface. This digital control not only enhances user experience but also aids in the timely maintenance of the unit.

Energy efficiency is another major selling point of the Raypak 302A-902A. The heater is designed with environmentally friendly practices in mind, utilizing a low NOx burner that minimizes harmful emissions. This not only meets environmental regulations but also makes it a greener alternative for heating needs.

In terms of installation, the compact design of the Raypak 302A-902A allows for versatile placement options, whether in a residential backyard or a commercial environment. Its user-friendly installation process ensures that homeowners and businesses alike can enjoy the benefits of heated water with minimal hassle.

Overall, the Raypak 302A-902A is an exemplary choice for anyone seeking a high-quality, efficient, and flexible pool and spa heating solution. Its combination of robust engineering, advanced technology, and user-focused features solidifies its position as a leader in the market, promising effective heating for years to come. Whether for personal enjoyment or commercial use, this heater delivers exceptional performance that meets diverse heating needs.
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