Bryant 345MAV instruction manual Ðaltitude Derate Multiplier for U.S.A, Example

Page 37

ON AND

OFF SWITCH

GAS

PRESSURE

REGULATOR

ADJUSTMENT

BURNER

ENCLOSURE

REFERENCE

PRESSURE

TAP

BURNER

ORIFICE

INLET

PRESSURE TAPMANIFOLD PRESSURE TAP

A95622

Fig. 40ÐRedundant Automatic Gas Valve

b. Remove cap that conceals adjustment screw for gas valve regulator. (See Fig. 40.)

c.Turn adjusting screw, counterclockwise (out) to decrease manifold pressure or clockwise (in) to increase manifold pressure.

NOTE: This furnace has been approved for a manifold pressure of 3.2 in. wc to 3.8 in. wc when installed at altitudes up to 2000 ft. For altitudes above 2000 ft, the manifold pressure can be adjusted from 2.0 in. wc to 3.8 in. wc.

CAUTION: DO NOT bottom out gas valve regulator adjusting screw. This can result in unregulated manifold pressure and result in excess overfire and heat exchanger failures.

NOTE: If orifice hole appears damaged or it is suspected to have been redrilled, check orifice hole with a numbered drill bit of correct size. Never redrill an orifice. A burr-free and squarely aligned orifice hole is essential for proper flame characteristics.

d.Replace gas valve regulator adjustment screw cap.

e.Replace burner enclosure front and verify adjusted gas input rate using method outlined in item 3.

f.Look through sight glass in burner enclosure and check burner flame. Burner flame should be clear blue, almost transparent. (See Fig. 41.)

3. Verify natural gas input rate by clocking gas meter.

NOTE: Be sure all pressure tubing, combustion-air and vent pipes, and burner enclosure front are in place when checking input by clocking gas meter.

NOTE: High-Altitude Adjustment

UNITED STATES

At altitudes above 2000 ft, this furnace has been approved for a 2% derate for each 1000 ft above sea level. See Table 8 for derate multiplier factor.

EXAMPLE:

100,000 Btuh input furnace installed at 4300 ft.

Furnace Input Rate

 

Derate

 

Furnace Input Rate

X

Multiplier

=

at Installation

at Sea Level

 

Factor

 

Altitude

 

 

 

100,000

X

0.91

=

91,000

A93059

CAUTION: DO NOT redrill orifices. Improper drilling (burrs, out-of-round holes, etc.) can cause excessive burner noise and misdirection of burner flames. This can result in flame impingement of burners and heat exchang- ers causing failures.

BURNER FLAME

BURNER

MANIFOLD

A89020

Fig. 41ÐBurner Flame

TABLE 8ÐALTITUDE DERATE MULTIPLIER FOR U.S.A.

ALTITUDE

% OF

DERATE MULTIPLIER

(FT)

DERATE

FACTOR FOR U.S.A*

0Ð2000

0

1.00

2001Ð3000

4Ð6

0.95

3001Ð4000

6Ð8

0.93

4001Ð5000

8Ð10

0.91

5001Ð6000

10Ð12

0.89

6001Ð7000

12Ð14

0.87

7001Ð8000

14Ð16

0.85

8001Ð9000

16Ð18

0.83

9001Ð10,000

18Ð20

0.81

 

 

 

* Derate multiplier factor is based on midpoint altitude for altitude range.

CANADA

→At installation altitudes from 2000 to 4500 ft, this furnace must be derated 5% by an authorized Gas Conversion Station. To deter- mine correct input rate for altitude, see example above and use

0.95as derate multiplier factor.

a.Turn off all other gas appliances and pilots.

b.Start furnace and let operate for 3 minutes.

Ð37Ð

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Contents Ð1Ð Electrostatic Discharge ESD Precautions→ ÐDimensional Drawing DimensionsÐ2Ð Unit SizeElectrostatic Discharge ESD Precautions Safety ConsiderationsMinimum Inches Clearance to Combustible Construction → ÐClearances to CombustiblesApplications General IntroductionII. Upflow Applications Condensate Trap Location Factory-Shipped OrientationCondensate Trap Location Alternate Upflow Orientation Ð5ÐÐ6Ð Pressure Switch TubingCondensate Trap Field Drain Attachment III. Downflow Applications Condensate Trap Freeze ProtectionCondensate Trap Location Condensate Trap TubingÐ8Ð IV. Horizontal Left SUPPLY-AIR Discharge ApplicationsConstruct a Working Platform Horizontal Right SUPPLY-AIR Discharge ApplicationsÐ9Ð ÐAttic Location and Working Platform Front Upflow or Downflow Horizontal II. Furnace Location Relative to Cooling Equipment AIR for Combustion and Ventilation General III. Hazardous LocationsII. Unconfined Space III. Confined SpaceCombustion AIR from Outdoors Through Vertical Ducts Installation Leveling Legs if DesiredCombustion AIR from Outdoors Through Horizontal Ducts Opening Dimensions II. Installation on a Concrete SlabFurnace Casing Width AIR Ducts IV. Installation in Horizontal ApplicationsGeneral Requirements Ductwork acoustical treatmentVI. Filter Arrangement Return Air ConnectionsÐfilter Information VII. Bottom Closure Panel171⁄2-IN. Wide Casings only VIII. GAS PipingElectrical Connections Ðmaximum Capacity of Pipe CU FT PER HRNominal Length of Pipe FT Iron Internal Diameter Size Length FT³ CKT BKR Amps Phase WiringÐelectrical Data Amps SizeÐWiring Diagram III. Accessories II -V WiringVenting Removal of Existing Furnaces from Common Vent SystemsGeneral II. COMBUSTION-AIR and Vent PipingCombustion Air Pipe ÐCombustion-Air Inlet Pipe Assembly 3001 to Ðmaximum Allowable Vent Pipe Length FT4001 to 5000² 5001 to 6000² Ðmaximum Allowable Vent Pipe Length FT6001 to 7000² 7001 to 8000²9001 to 10,000² ÐShort Vent 5 to 8 Ft System040 060 080 100 120 Vent Extension PipeIV. Multiventing III. Vent TerminationCondensate Drain General Ðvent Pipe Termination ClearancesÐRoof Termination Preferred II. Cooling Mode Heating ModeIII. Continuous Blower Mode IV. Heat Pump ModeComponent Test START-UP Procedures GeneralComponent Test Sequence II. Prime Condensate Trap with WaterIV. Adjustments → ÐInducer Housing Drain TubeIII. Purge GAS Lines Set Gas Input RateAltitude BTU/CU FT4001 Only5000 Only 5001775 70018000 Only 8001Example Ðaltitude Derate Multiplier for U.S.AAltitude Derate Multiplier Factor for U.S.A Blower Off Delay Heat Mode Set Temperature RiseÐgas Rate CU FT/HR ±SPEED SelectorII. Check Pressure Switch Check Safety Controls Check Primary Limit ControlChecklist CHECKLISTÐSTART-UP ChecklistðinstallationLoad Calculation Vent Piping
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345MAV specifications

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