Raypak 992B manual 87%-Efficiency Boilers Special Instructions, Water Piping

Page 45

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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Contents Installation & Operating Instructions Page Contents Pay Attention to These Terms Installations at Elevation Before InstallationProduct Receipt Model IdentificationComponent Locations Back Component LocationsModel Quantity Vent Size Gas Burners Blowers General InformationValves Model Burners per Valve Stages Fire at StageGeneral Safety Time/Temperature Relationships in ScaldsWater Time to Produce Serious Temp Burn Installation Codes InstallationEquipment Base StackingTable D Vent/Air Inlet Termination Clearances Indoor Installations Outdoor InstallationsClearances Reversing Air Filter Combustion and Ventilation AirDirect Vent Indoor UnitsConventional Combustion Air Supply InstallationsTruSeal Combustion Air All Air from Inside the BuildingWater Piping Canadian InstallationsGeneral Reversing Water ConnectionsCold Water Operation Relief Valve Piping Hydrostatic TestTemperature & Pressure Gauge Hydronic HeatingPump Selection Piping Pressure Drop in Feet of Head Feedwater RegulatorAir-Separation/Expansion Tank Three-Way ValvesPool Heating Potable Water and Space HeatingWinterizing Your Heater Automatic Chlorinators and Chemical FeedersPool/Spa Water Chemistry Water Hardness Gas SupplyPH of Water Total Dissolved SolidsReversing Gas Supply Connection Gas Supply ConnectionModel Table I Maximum Equivalent Pipe LengthCheck the Power Source Electrical Power ConnectionsGas Supply Pressure Field-Connected ControllersMaking the Electrical Connections Field Wiring ConnectionOn-Off Wiring Connections Flue Exhaust Tee VentingModel Diameter Order Number Appliance CategoriesVent Terminal Location Support of Vent StackCombustion Exhaust Certified Combustion AirInstallations Canadian InstallationsChanging the Flue Outlet Venting Configurations Venting Installation TipsInstallation Natural Draft Vertical Venting CategoryCommon Venting System TerminationCertified Vertical Venting Combustion Air Air Inlet Model HeightHorizontal Through-the-Wall Venting Category Horizontal Through-the-Wall Venting CategoryModel Certified Maximum Combustion Air Inlet Direct Vent Horizontal Through- the-WallVenting EquivalentDirect Vent Vertical Direct Vent VerticalOutdoor Installation ControlsFreeze Protection Models 992B-1262B Heater Sequence of OperationExternal Lights Color Indication Models 1532B 1802B Page Page Models 2002B 2342B Page Page Flow Switch High Limit Manual ResetIgnition Module Operating ControlLow Water Cut-Off Optional High and Low Gas Pressure SwitchesPump Time Delay UDB Diagnostic BoardUDB Fault History 87%-Efficiency Boilers Special Instructions Water PipingVenting Appliance Categories Vertical Venting Category Vent Terminal LocationCondensate Management Combustion 40’ 75’ 2072BE Air 2342BE Certified Maximum Combustion Air Air Inlet Model VentingDirect Vent Horizontal Through- the-Wall 992BE 75’ 100’ 1262BE Galvanized Steel 1532BE Category 25’ Wiring Diagram-Models 992B-1262B Wiring Diagram-Models 1532B-2342B Pre Start-up START-UPBlower Adjustment Main Burner AdjustmentStart-Up Leak Test Procedure Dual-Seat Gas Valves Safety InspectionFollow-Up Pilot Turn-Down TestLeak Test Post Start-Up CheckOperation Lighting InstructionsTo Turn Off Gas To Appliance Step TroubleshootingMaintenance Suggested Minimum Maintenance SchedulePreventive Maintenance Schedule Semi-Annually WeeklyAnnually As RequiredInside Air Contamination AppendixLimited Parts Warranty HI Delta Types H and WH Limited Parts Warranty HI Delta Type P START-UP Checklist for FAN-ASSISTED Raypak Products Page Page Page

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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