Adjusting Or Checking Furnace Input - Daikin Maverick I Installation And Maintenance Manual

Mechanical Installation
LP Conversion
▲
This unit is equipped at the factory for use with natural gas
only. Conversion to LP gas requires a special kit supplied by
the distributor or manufacturer. Mailing addresses are listed
on the furnace rating plate, parts list and warranty. Failure to
use the proper conversion kit can cause fire, carbon
monoxide poisoning, explosion, personal injury, property
damage, or death.
Convert the unit to use liquefied petroleum (LP) gas by
replacing with the gas valve supplied in the conversion kit.
The LP gas valve maintains the proper manifold pressure for
LP gas. The correct burner LP orifices are included in the kit.
See Figure 8 for component locations.
IMPORTANT: To remove the natural gas valve, remove the
four screws securing the manifold pipe to the burner tray.
Remove the manifold pipe with gas valve attached.
Note: Order the correct LP conversion kit from the furnace
manufacturer. See Conversion Kit Index shipped with
unit for proper LP kit number. Furnace conversion to LP
gas must be performed by a qualified technician.
Figure 8: Heat Exchanger Component Identification
Figure 9: Honeywell VR8305Q4120 Two Stage Gas Valve
OUTLET PRESSURE
TAP-1/8 NPT
GROUND
TERMINAL
LOW STAGE ADJUSTMENT
UNDER VENT CAP
10
DANGER
ST-A0886-29
2-STAGE
OPERATOR
INLET PRESSURE
TAP-1/8 NPT
HIGH STAGE ADJUSTMENT
UNDER VENT CAP

Adjusting or Checking Furnace Input

Gas Type Line pressure (in wc)
Natural Gas 5 - 10.5
LP Gas 11-13
Supply and manifold pressure taps are located on the gas valve
body 1/8" N.P.T. and on the manifold (see
Use a properly calibrated manometer gauge for accurate gas
pressure readings.
Only small variations in the gas flow should be made by
means of the pressure regulator adjustment. Furnaces
functioning on LP gas must be set by means of the tank or
branch supply regulators. The furnace manifold pressure
should be set at 10" W.C. at the gas control valve.
To adjust the pressure regulator, remove the regulator vent
cover and turn the adjustment screw clockwise to increase
pressure or counterclockwise to decrease pressure (see
9). Then replace the regulator vent cover securely.
Any necessary major changes in the gas flow rate should be
made by changing the size of the burner orifices. To change
orifice spuds, shut off the manual main gas valve and remove
the gas manifold.
For elevations up to 2,000 feet, rating plate input ratings
apply. For high altitudes (elevations over 2,000 ft.), contact
Daikin Parts.
Check of input is important to prevent over-firing of the
furnace beyond its design-rated input. NEVER SET INPUT
ABOVE THAT SHOWN ON THE RATING PLATE. Use the
following table or formula to determine input rate.
Heating Value of Gas (BTU/CuFt) x 3600
Cu. Ft./Hr. Required =
Time in Seconds for 1 Cu. Ft. of Gas
Start the furnace and measure the time required to burn one
cubic foot of gas. Prior to checking the furnace input, make
certain that all other gas units are shut off, with the exception
of pilot burners. Time the meter with only the furnace in
operation.
IMPORTANT NOTE FOR ALTITUDES ABOVE 2,000
FEET (610 METERS): The main burner orifices in your
furnace and in these kits are sized for the nameplate input and
intended for installations at elevations up to 2,000 feet in the
USA or Canada, or for elevations of 2,000 - 4,500 feet (610 -
1,373 meters) in Canada if the unit has been derated at the
factory. For elevations above 2,000 feet (610 meters) IN THE
USA ONLY (see ANSIZ223.1), the burner orifices must be
sized to reduce the input 4% for each 1,000 feet (305 meters)
above sea level.
Manifold Pressure
3.5
10
Figure 9).
Figure
Daikin IM 972-1