as the system heats up, the outlet temperature may continue to climb and actuate the high limit, thereby shutting down the heater. Thus an automatic valve system, such as a three-way proportional valve or a modulating two-way valve to control the bypass, should be utilized.

Cold Water Run

Cold water run differs from cold water start in that the system water entering the heater remains below 105ºF (41ºC) continuously. Typically, this is the case in swim- ming pool heating and water source heat pump applications as well as some others. If the system water is kept in a narrow temperature range, a perma- nent manual bypass can be employed and manually adjusted to achieve an inlet temperature of 105ºF (41ºC) or higher. An injector pump arrangement may also be utilized to keep the heater loop at or above 105ºF (41ºC). An injector pump approach has the added value of being able to adjust to changes in the system water coming back to the heater take-off.

Temperature & Pressure Gauge

The temperature and pressure gauge is factory- mounted in the in/out header.

Hydronic Heating

Pump Selection

In order to ensure proper performance of your heater system, you must install a correctly sized pump. Ray- pak recommends using a 20°F ΔT as design ΔT. (ΔT is the temperature difference between the inlet and out- let water when the heater is firing at full rate). If a ΔT of larger than 20°F is necessary, see Table G and Table H for flow rate requirements.

Model

10°F ΔT

20°F ΔT

30°F ΔT

 

Min. Flow

 

Max. Flow

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No.

gpm

ΔP (ft)

gpm

ΔP (ft)

gpm

ΔP (ft)

gpm

 

ΔP (ft)

 

ΔT

gpm

ΔP (ft)

 

ΔT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

399B

67

5.5

34

1.4

22

0.6

20

 

0.5

 

34

90

10.0

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

499B

84

9.1

42

2.3

28

1.1

21

 

0.6

 

40

90

10.4

 

9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

649B

 

 

55

4.1

36

1.8

27

 

1.1

 

40

90

10.8

 

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

749B

 

 

63

5.7

42

2.6

32

 

1.5

 

40

90

11.3

 

14

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

899B

 

 

76

8.3

50

3.8

38

 

2.2

 

40

90

11.7

 

17

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

989B

 

 

83

5.2

55

2.3

42

 

1.3

 

40

132

13.1

 

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1259B

 

 

106

9.6

71

4.3

53

 

2.4

 

40

132

14.8

 

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1529B

 

 

129

15.7

86

7.1

64

 

4.0

 

40

132

16.5

 

19

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1799B

 

 

 

 

101

10.7

76

 

6.0

 

40

132

18.3

 

23

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1999B

 

 

 

 

112

13.8

84

 

7.9

 

40

132

19.0

 

25

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2069B

 

 

 

 

116

14.8

87

 

8.5

 

40

132

19.0

 

26

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2339B

 

 

 

 

132

21.4

98

 

12.1

 

40

132

21.4

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Notes: 1. Basis for minimum flow: Models 399–899, 20 gpm or 40°F ΔT. Models 989–2339, 30 gpm or 40°F ΔT. Basis for maximum flow: Models 399–899, 90 gpm. Models 989–2339, 132 gpm.

2. Flow switch will not operate if flow is less than 20 gpm.

Table G: Heater Rates of Flow and Pressure Drops

16

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Raypak 399B-2339B operating instructions Hydronic Heating, Temperature & Pressure Gauge, Pump Selection, Cold Water Run
Page 15 Page 17

399B-2339B specifications

The Raypak 399B-2339B is a notable pool heater that stands out in the competitive market of heating solutions, particularly aimed at residential and commercial swimming pools and spas. Designed for efficiency and reliability, the Raypak 399B-2339B integrates advanced technology to deliver a comfortable swimming experience, safeguarding users against fluctuating outdoor temperatures.

One of the primary features of the Raypak 399B-2339B is its robust design, built to withstand the rigors of outdoor environments. With a durable cabinet made from corrosion-resistant materials, it ensures longevity and resistance to various weather conditions. This heater boasts a compact footprint, making it an ideal choice for properties with limited installation space.

A standout characteristic of this model is its energy efficiency. The Raypak 399B-2339B utilizes a high-efficiency gas burner, allowing it to heat water quickly while consuming less fuel. This efficiency not only reduces operational costs but also aligns with environmentally conscious practices, making it an appealing choice for eco-friendly users.

Equipped with innovative technologies, this heater offers both digital controls and diagnostic capabilities. The user-friendly digital display allows for precise temperature control and easy monitoring of the heater's performance. Additionally, the built-in diagnostics feature alerts users to any operational issues, ensuring timely maintenance and minimizing downtime.

The Raypak 399B-2339B is compatible with both natural gas and propane, providing versatility in energy sources. This adaptability can be particularly beneficial for those seeking to switch fuel types or utilize available resources. Moreover, its low NOx emissions make it compliant with stringent environmental regulations, contributing to cleaner air and a healthier ecosystem.

In terms of heating capacity, the Raypak 399B-2339B boasts a powerful output, efficiently heating large bodies of water. This performance makes it suitable for various applications, from residential pools to commercial aquatic centers, ensuring that swimming enjoyment is never compromised due to cold water.

The unit also features a built-in water hydraulics system that optimizes water circulation, preventing overheating and prolonging the lifespan of the heater. Furthermore, the Raypak engineering team has ensured that the installation process is straightforward, with clear guidelines and necessary plumbing fittings provided.

In summary, the Raypak 399B-2339B is a top-tier pool heater that offers durability, energy efficiency, advanced technology, and versatile fuel compatibility. Its high performance and user-friendly features make it a reliable investment for anyone looking to enhance their swimming experience.
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