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Bryan Boilers AB Series, Инструкция по установке, эксплуатации и обслуживанию

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1.8.15 QUICK SELECTION FOR VENT SIZING CHARTS

 

 
GENERAL 
These charts were generated using the 
procedure described in Chapter 26 of the 
ASHRAE Equipment Handbook (1979). The 
results are consistent with those of the National 
Fuel Gas Code.The responsibility for assurance 
of such compliance is that of the system designer 
and/or the system installer. All sizing and 
installation must be checked against such local 
requirements. 
 
The sizing herein is applicable to vent systems 
utilizing double wall listed Type B vent as well as 
single wall insulated vent with insulation 
equivalent to double wall insulating value. 
 
This sizing procedure is not applicable to vent 
systems utilizing single wall uninsulated vents or 
vent connectors. 
 
The sizing information given herein is intended as 
a general recommendation only. Vent sizing and 
installation must comply with local codes.   
 

RECTANGULAR VENTS 
Vent systems may be rectangular as well as 
circular. Table 1.8.15F has been provided to give 
the circular equivalent of a rectangular duct. 
These equivalent values account for the higher 
pressure drop per cross sectional area for 
rectangular ducts. 
 
STEP 1: EQUIVALENT INPUT - DRAFT 
CONTROL FACTOR 
Determine the boiler (system) Draft Control 
Factor, F

1

, from Table 1.8.15A. 

 
Determine the boiler (or total system) input in 
MBH. This is done by dividing the boiler (or total 
system) input in Btu/hr by 1000. 
 
Multiply the total input times factor F

1

. 

 
The equivalent input, I, (without altitude 
correction) is then: I = MBH x F

1

   eq. 15A 

 
 

TABLE 1.8.15A: DRAFT CONTROL FACTOR 

F

1

 

Multiply factor times input in MBH 

Boiler Type 

Factor, F

1

 

Atmospheric with Draft Hood 

1.000 

Atmospheric with Barometric 

0.741 

Forced Draft Gas or Oil 

0.602 

 

 

STEP 2: EQUIVALENT INPUT - ALTITUDE 
FACTOR 
Determine the boiler (system) Altitude Correction 
Factor, F

2

, from Table 1.8.15B. 

 
Multiply the boiler (or total system) input times 
factors, F

2

 and F

1

 for the equivalent input. 

The altitude correction factor, F

2

 for atmospheric 

boilers is equal to 1, because their inputs are 
already derated for altitude. 
 
The equivalent input, I, with corrections for 
altitude is: I = MBH x F

1

 x F

2

   

eq. 15B 

 

 

 

 

Содержание AB Series

Страница 1: ...ion Operation Service Manual for Atmospheric Water Boilers E Mail bryanboilers iquest net Internet www bryanboilers com BRYAN BOILERS 783 N CHILI AVENUE PERU INDIANA 46970 Telephone 765 473 6651 Fax 765 473 3074 ...

Страница 2: ...ld up an insulating floor under the boiler using high temperature mineral fiber board at least 1 1 2 thick 1 2 CLEARANCES See Table 1 for minimum clearances to wall ceilings or obstructions The clearances in Table 1 are intended as a general recommendation only Local codes must be applied to specific installations and the minimum clearances established accordingly Provisions must also be made for ...

Страница 3: ...ER 50 WATER STEAM TO 50 STEAM OVER 50 A 18 36 18 48 24 24 18 36 24 24 B 24 24 48 96 48 36 48 24 48 48 CV CH 18 36 18 36 24 24 24 24 24 24 D 48 96 18 36 24 24 24 24 24 24 EL ER 24 24 18 36 24 24 24 24 32 32 1 F Series boilers are approved for installation on combustible flooring Do not install on carpeting A Clearance above boiler B Front of boiler CV Clearance from gas vent measured vertically abo...

Страница 4: ...ing pool water the heating system connections discussed above are capped The relief valve connections are still required Water connections are made only to the indirect heat exchanger s according to the piping drawing included in this manual An automatic boiler fill valve is provided with the boiler This valve must be connected to the fresh water system With some units this connection is made to t...

Страница 5: ... ANSI NFPA 70 1981 1 7 COMBUSTION AIR SUPPLY IMPORTANT Positive means for supplying an ample amount of outside air allowing complete combustion of the gas must be provided Movable combustion air dampers automatic or manually adjustable must be electrically interlocked with the boiler to prevent boiler operation if the dampers are closed Combustion air openings must never be blocked or obstructed i...

Страница 6: ...nel in the boiler room In colder climates provision should also be made to heat the boiler room if necessary for personnel comfort CAUTION Protection from combustion air contamination Where corrosive or flammable process fumes are present in the vicinity of the boiler room or the air stream for the combustion air supply it is essential that suitable means be provided for their safe disposal The bo...

Страница 7: ...tal input of appliances connected to the chimney or vent by 1 000 000 Then multiply this result times the value listed in the table for PPH emissions MANUAL REFERENCES See Figure 1 8 1 for a graphics listing of applicable sections of this manual for each section of the vent system FIGURE 1 8 1 VENT DESIGN INSTRUCTIONS REFERENCE TABLE 1 8 1A ESTIMATING FLUE GAS VOLUMETRIC FLOW RATE Approximate Flue...

Страница 8: ...mospheric Gas Barometric D R N A N A N A N A 0 115 0 115 70 90 0 120 0 120 75 100 N A N A N A N A 1 8 2 CLEARANCES The vent system and draft control devices must be installed so as to achieve the clearances to surfaces outlined in Table 1 2 1 Minimum Clearances chart in this manual See also Table 1 8 9 for vent clearances All clearances must comply with the National Fuel Gas Code NFPA54 and with a...

Страница 9: ... THE BOILER MUST BE PROVIDED WITH A SINGLE ACTING BAROMETRIC DRAFT CONTROL NOT WITH A DRAFT DIVERTER THE FAN MUST BE INTERLOCKED WITH THE BOILER 1 8 5 DRAFT CONTROL INSTALLATION DRAFT DIVERTER Each atmospheric gas boiler is supplied with a VERTICAL DRAFT DIVERTER or a BAROMETRIC DRAFT REGULATOR THESE DEVICES MUST BE INSTALLED WITHOUT MODIFICATION DO NOT SHORTEN THE COLLAR LENGTH OF A DRAFT DIVERTE...

Страница 10: ...ding or removing weights washer type Item F at the end of the chains DO NOT MOVE THE LARGE WEIGHTS ATTACHED DIRECTLY TO THE GATE Item G as they are used only for adjustment at the factory DRAFT should generally be set between 0 02 and 0 04 w c The actual setting must be determined by taking a CO2 reading and a CO reading at the boiler flue Reference Table 2 5A for appropriate values COMBUSTION REA...

Страница 11: ...wall metal pipe should be insulated to prevent excessive heat in the boiler room and to avoid ignition and spillage problems as well as corrosion from excessive condensation MASONRY METAL AND FACTORY BUILT CHIMNEYS Installation of factory built vents and chimneys must comply with the vent listing with the vent manufacturer s instructions and with adherence to the codes and clearances as outlined h...

Страница 12: ...nch per foot LENGTH OF VENT CONNECTOR The vent connector must be as short as possible and the boiler close as practical to the chimney or vent The horizontal run of an uninsulated vent connector to a natural draft chimney or vent servicing a single appliance must not be more than 75 of the height of the chimney or vent above the vent connector The horizontal run of an insulated vent connector to a...

Страница 13: ...t and the thimble in which case the thimble may be 2 larger For unlisted appliances or for barometric provided with barometric dampers the thimble must be 6 inches larger in diameter than the vent SINGLE WALL METAL VENT PIPE USED TO VENT STEAM BOILERS OPERATING OVER 50 PSIG MUST NOT PASS THOUGH WALLS OR PARTITIONS CONSTRUCTED OF COMBUSTIBLE MATERIAL 1 8 9 CHIMNEY VENT CONSTRUCTION VERTICAL SECTION...

Страница 14: ...amined to ascertain that it is clear and free of obstructions Cleanouts must be constructed such that they will remain tightly closed when not in use Tee fittings used as cleanouts or condensate drains must have tight fitting caps to prevent entrance of air into the chimney at such points When an existing masonry chimney is unlined and local experience indicates that vent gas condensate may be a p...

Страница 15: ... building within a distance of 25 feet from the vent Reference NFPA 211 MINIMUM HEIGHT ABOVE DRAFT CONTROL Chimneys and gas vents must extend at least 5 feet above the highest connected draft diverter outlet barometric draft control or any appliance flue outlet CLEARANCE FROM AIR INLETS The vent or chimney must terminate no less than 3 feet above any forced air inlet within a distance of 10 feet I...

Страница 16: ... one vent diameter above the vent exit 1 8 13 AUTOMATIC VENT DAMPERS ONE APPLIANCE ONLY An automatic vent must be installed such that it serves only one appliance vent that to which is properly interlocked LISTING REQUIREMENTS Automatic vent dampers if used must be of a listed type INSTALLATION The damper installation must comply with Appendix I J or K of the National Fuel Gas Code NFPA 54 The ins...

Страница 17: ... than for a natural draft system Sizing of induced draft fans should be done using the recommendations of the fan manufacturer and the ASHRAE Handbook FIG 1 8 14 SUGGESTED APPLIANCE VENTING PROCEDURE MULTIPLE APPLIANCE INSTALLATIONS Bryan recommends that boilers and other gas appliances be individually vented when possible See figure 1 8 14A Individual venting provides better draft control and fue...

Страница 18: ...has been provided to give the circular equivalent of a rectangular duct These equivalent values account for the higher pressure drop per cross sectional area for rectangular ducts STEP 1 EQUIVALENT INPUT DRAFT CONTROL FACTOR Determine the boiler system Draft Control Factor F1 from Table 1 8 15A Determine the boiler or total system input in MBH This is done by dividing the boiler or total system in...

Страница 19: ...eed to Step 4 to calculate the system k factor to determine the actual stack diameter required STEP 4 CALCULATE SYSTEM K FACTOR The system k factor accounts for the pressure drop through fittings and vent piping It is calculated by adding up the individual k factors for each of the fittings plus the k factor for the vent pipe s From Table 1 8 15D find the k factors for each of the elbows tee fitti...

Страница 20: ...sing this adjusted equivalent input check the stack diameter by following Steps 2 thru 3 again If the stack diameter remains the same the sizing is complete If not redo Steps 4 thru 5 etc until an acceptable result is achieved Table 1 8 15E K Factor Equivalent Input Correction Factor F3 K Factor F3 K Factor F3 K Factor F3 K Factor F3 K Factor F3 1 00 0 37 1 50 0 45 2 00 0 52 2 50 0 58 3 00 0 63 3 ...

Страница 21: ... 5160 5650 6110 6530 6920 7300 8160 8940 10330 26 1910 2260 2710 2960 3320 3830 4280 4690 5070 5420 5750 6060 6640 7170 7660 8130 8570 9580 10490 12120 28 2220 2630 3140 3440 3850 4440 4970 5440 5880 6280 6660 7030 7700 8310 8890 9430 9940 11110 12170 14060 30 2550 3010 3600 3950 4420 5100 5700 6250 6750 7210 7650 8070 8840 9540 10200 10820 11410 12760 13970 16140 32 2900 3430 4100 4490 5020 5800 ...

Страница 22: ......

Страница 23: ... 54 17 21 23 26 29 31 33 35 39 39 40 42 44 48 52 56 59 62 60 18 21 24 27 30 32 34 37 39 40 42 44 46 50 55 59 62 66 1 8 16 SPECIAL APPLICATIONS FLUE GAS ECONOMIZERS When applying flue gas economizers care must be taken to assure that 1 Proper draft must be maintained This requires that the gas side pressure drop be considered and that the economizer exchanger must be designed so as to allow cleanin...

Страница 24: ... s literature on the components included in the manual MAIN GAS COCK MANUAL SHUTOFF VALVE The main shutoff cock is located in the gas line ahead of the main gas pressure regulator This manual valve must be CLOSED during servicing of the burners DO NOT OPEN THIS VALVE IF THE AUTOMATIC GAS VALVES ARE OPEN Refer to Section 2 of this manual and to Lighting Instructions for proper use of this valve A s...

Страница 25: ... power to the automatic gas valve s Carefully read the enclosed instruction sheet on the pilotstat ELECTRONIC FLAME SUPERVISORY CONTROLS Electronic controls sense the flame using either a flame rod wire which conducts electrical current though the flame or and ultraviolet scanner a device which senses the ultraviolet light emitted by the flame to sense the presence of a pilot flame This type of co...

Страница 26: ...re sealed This is necessary because although the boiler is hydrostatically tested at the factory minor leaks in fittings and at attachments can develop from shipping vibration or from installation procedures It is often necessary to retighten such fittings after installation and after the boiler has been operated for some time Replace tube access panels before proceeding to start boiler 1 10 2 TES...

Страница 27: ... sheet in the boiler manual for the proper adjustment of the pilot burner This is absolutely essential before attempting to adjust the main burner 2 1 3 ADJUST BOILER INPUT S The boiler input must be adjusted for both maximum and minimum input values which are listed on the boiler nameplate on the boiler First adjust the maximum input rating using the method described in the Lighting Instructions ...

Страница 28: ...both valves achieving full input 2 2 FIRING RATE ADJUSTMENT GAS METER READINGS 2 2 1 CHECKING BURNER INPUT The burner input rate can be checked by taking readings from the gas meter Please note checking the rate with a meter is the only way to be sure of input Manifold readings are only an approximate value and may vary from unit to unit In order to obtain accurate data there must be no other appl...

Страница 29: ...ude an outdoor reset control This control increases the boiler operating temperature with a decrease in outdoor air temperature and decreases the boiler operating temperature with a rise in the outdoor temperature For gas fired boilers it is essential that the minimum operating temperature of the boiler never drop below 130 F even at 70 F outdoor temperature Reference Section 3 4 Also refer to the...

Страница 30: ...up water is introduced as needed Carefully read the enclosed literature on the Low Water Cut off controls particularly installing operating and servicing 2 4 9 OTHER CONTROLS Additional controls as required for the particular installation may also be provided Refer to the literature on these devices included in the Boiler Manual All such devices must be operationally tested to assure reliable oper...

Страница 31: ...und the edge of the draft hood relief opening or barometric If the venting system is operating correctly the match flame will be drawn toward the draft hood relief opening Otherwise the products of combustion will tend to push the flame and extinguish it CAUTION IF THE PRODUCTS OF COMBUSTION ARE BEING EMITTED INTO THE ROOM VENTING SYSTEM NOT OPERATING CORRECTLY THE BOILER MUST NOT BE OPERATED UNTI...

Страница 32: ...ared to operate and maintain the boiler properly The operating instructions should be kept in the pocket in the boiler for F Series boilers or adjacent to the boiler for all others READ THE MANUAL BEFORE ATTEMPTING A START UP 2 7 MAINTENANCE SCHEDULE 2 7 1 POSTING SCHEDULE Post a maintenance schedule in accordance with the recommendations in this manual A copy of a typical schedule is included in ...

Страница 33: ...stem is neither difficult nor expensive The chemicals needed for cleaning are readily available Trisodium phosphate and sodium hydroxide lye are the most commonly used chemicals Use only one type of solution in the system The amount of chemical required will vary according to conditions but one pound per fifty gallons of water is suggested Fill the system with this solution venting all air Then wi...

Страница 34: ...nection to the tank Install a strainer in boiler return piping 3 3 BOILER WATER TREATMENT PURPOSE OF WATER TREATMENT Water treatment is required for satisfactory operation of the boiler It must be devised to prevent depositing of scale and corrosion from acids oxygen and other such harmful elements that may be in the water supply A qualified water treatment chemist should be consulted and the wate...

Страница 35: ...ssibly hazardous boiler operation Failure to do so may result in fire explosion potential or asphyxiation A combustion test and burner adjustments should be undertaken at once Rust on the tubes indicates that boiler operating temperatures are too low The set point of the boiler operating control must be no less than 130 F for natural gas or propane firing and 170 F for oil fired boilers Boilers eq...

Страница 36: ...akage tests on pilot and main gas or main oil fuel valves as specified in manufacturer s instructions 2 Check operating control high limit low fire start control and low water cutoff as specified in manufacturer s instructions 4 For units equipped with power burners check air atomizing interlock fuel valve interlock switch purge switch burner position interlock and fuel changeover control as speci...

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