Burnham SCG manual VII. Modular Installation

Page 62

VII. Modular Installation

A.General Guidelines

1.Read and follow all venting, combustion air, water piping, gas piping and electrical instructions contained in this manual unless otherwise instructed in this section.

2.Consult Local Building Codes or National Fuel Gas Code, NFPA 54/ANSI Z222.3 for restrictions and instructions on modular boiler installations.

B.Module Sizing

Burnham recommends sizing each boiler in a modular system to provide 20 % of the combined heating load where ever possible.

C.Venting

1.Each boiler must have an individual vent pipe. Refer to Venting Section of this manual for venting guidelines and options.

WARNING

Do not manifold vent pipes together.

2.The maximum vent length for each boiler is fifty

(50)equivalent feet.

3.The minimum horizontal distance between vent terminations is one (1) foot. Additional horizontal distance is desirable to avoid frost damage to the building. Vent terminations must be at least twelve

(12)inches above the ground plus the expected snow accumulation.

CAUTION

Installing multiple vent terminations close together promotes frost buildup on buildings. To minimiz e this possibility, extend the distance from the building to the end of the vent termination and increase the horiz ontal distance between terminations.

4.Multiple vertical vent pipes may be piped through a common conduit or chase so that one roof penetration may be made. Each vent termination must be one (1) foot from other terminations.

D.Air Intake Piping

1.Each boiler must have an individual air intake pipe, refer to Venting Section of this manual for Air Intake Guidelines and Options.

2.The maximum air intake length for each boiler is fifty (50) equivalent feet.

3.Locate air intake termination on the same wall as the vent termination if possible, to prevent nuisance boiler shutdowns. However, boiler may be installed

with vertical venting and sidewall combustion air inlet (or visa versa) if installation conditions do not allow alternate arrangement.

Table 9: Modular Boiler Water Manifold Sizing

Combined Output

Recommended Minimum

Common Water Manifold

(MBH)

Size (NPT)

 

 

 

< 166

1¼"

 

 

< 260

1½"

 

 

< 550

2"

 

 

< 900

2½"

 

 

< 2000

3"

 

 

E.Water Piping (See Table 9)

Installing a low water cutoff in the system piping of modular systems is strongly recommended and may be required by Local Codes.

F.Gas Piping

1.Refer to National Fuel Gas Code, Local Codes and Tables 7 and 8 for gas pipe sizing.

2.Each boiler must be piped as shown in Figure 27.

WARNING

If gas pressure in the building is above

½psig, an additional gas pressure regulator is required. Using one additional regulator for multiple boilers may result in unsafe boiler operation. The additional regulator must be able to properly regulate gas pressure at the input of the smallest boiler. If the regulator cannot do this, two or more additional regulators are required. Consult regulator manufacturer and/or local gas supplier for instructions and equipment ratings.

G.Electrical

1.Each boiler must be provided with a fused disconnect and service switch.

2.Install wiring in accordance with requirements of authority having jurisdiction. In the absence of such requirements, follow the National Electric Code, NFPA 70 and/or CSA C22.1 Electric Code.

H.Modular Boiler Control Systems

Contact a controls manufacturer such as Honeywell or Tekmar to properly apply a modular control system.

Common systems may use outdoor temperature, return water temperature or both to stage the boilers.

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Contents SCG Important Information Read Carefully Page Table of Contents Dimensions Appliance is design certified for installation on Pre-InstallationInstallation must conform to the requirements Provide combustion and ventilation air in accordanceII. Unpack Boiler Do not drop boiler. Do not bump boiler jacket against floorIII. Venting / Air Intake Piping See SectionVent System Components Part Number Vent Guidelines Due to Removal of an Existing Boiler General GuidelinesInstall Vent Pipe, Burnham Gasketed Vent System Burnham Gasketed Vent Joint DetailVent Piping Recommended Separate Horizontal Vent/Air Intake Installation Alternate Separate Horizontal Vent/Air Intake Installation Page Page Separate Vertical Venting System See Figures 6, 7, 8A, 8B Page Vertical Vent Installation Page Page Vertical Air Intake Piping Install Combination Vent/Air Terminal. See Figure Install Air Intake Piping. See Figures 10 Combination Horizontal Vent/Air Installation SCG-3 thru Page Description Part Number SCG-3 & SCG-4 SCG-5 & SCG-6 Pre-Installation Considerations General Installation RequirementsPage Joint Assembly Instructions Inner pipe is always cut 1 longer than the outer pipe Condensate Drains Horizontal Supports Page Fire Stop/Wall Thimble/Support, SC FS Tall Cone Flashing Directly On Roof or CurbPage Horizontal Recommended Separate Horizontal Vent Installation Alternate Separate Horizontal Vent Installation Optional Indoor Air 3 or 4 Vent Terminal Installation Install vent piping Optional Separate Horizontal 3 Vent Terminal Installation Optional Separate Horizontal 4 Vent Terminal Installation Page IV. Water Piping and Trim How to Wire How to TestSupply Water Manifold Piping Page Page Gas Piping Gravity FactorRecommended Gas Piping Page VI. Electrical Internal Boiler Wiring Schematic Diagram Internal Boiler Wiring Ladder Diagram System Controls and Wiring System Wiring Schematic for Single Zone Space Heating Only Page Circulator Zoned System Wiring Schematic Zone Valve Zoned System Wiring Schematic Page VII. Modular Installation Modular Boiler Gas Piping VIII. System Start-up Operating Instructions Sequence of Operation Adjust gas input rate to boiler Check limitIX. Service Low water cutoff if so equippedSilicone Tubing Assembly Main Burners and FireboxFlue and Burner Cleanout, 1 Burner Procedure for Measuring Differential Pressure See Figure Pilot Burner LocationPage Page XI. Repair Parts Casting Assembly Page Base Assembly Page Base Enclosure Assembly Page FAN/CANOPY Assembly Page Burner Assemblies Page Control Panel Assembly Page Jacket Parts Miscellaneous Parts Carton Avoid Breathing Fiber Particulates and Dust Service Record Service Record Limited Warranty

SCG specifications

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