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IM 970-2 • MAVERICK I ROOFTOP 10 www.DaikinApplied.com
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Adjusting or Checking Furnace Input
• Natural Gas Line Pressure 5" – 10.5" W.C.
• LP Gas Line Pressure 11" – 13" W.C.
• Natural Gas Manifold Pressure – 3.5" W.C
• LP Gas Manifold Pressure – 10" W.C.
Supply and manifold pressure taps are located on the gas
valve body ⅛" N.P.T. and on the manifold.
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 cap
and turn the adjustment screw clockwise to increase pressure
or counterclockwise to decrease pressure.
Then replace the
regulator cap 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
Applied 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/Cu. Ft.) × 3600
Cu. Ft. Per 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 ANSI-Z223.1), the burner orifices must be sized to reduce
the input 4% for each 1,000 feet (305 meters) above sea level.
Table 5: Meter Times
Meter time, in minutes and seconds, for normal input
rating of furnaces equipped for natural or LP gas
Input
BTU/hr
Meter
Size
Cu .Ft .
Heating value of gas BTU per cu . ft .
900
1000
1040
1100
2500
40,000
1
1:21
1:30
1:34
1:39
3:45
10
13:30
15:00
15:36
16:30
37:30
60,000
1
0:54
1:00
1:03
1:06
2:30
10
9:00
10:00
10:24
11:00
25:00
80,000
1
0:41
0:45
0:47
0:50
1:53
10
6:45
7:30
7:48
8:15
18:45
100,000
1
0:33
0:36
0:38
0:40
1:30
10
5:24
6:00
6:15
6:36
15:00
Important notice:
Derating of the heating input for high
altitude in the field is unlawful in Canada (refer to CAN/ CGA
2.17). Units installed in altitudes greater than 2,000 feet (610
meters) must be shipped from the factory or from a factory
authorized conversion station with the heating input derated by
10% so as to operate properly in altitudes from 2,000 – 4,500
feet (610 – 1,373 meters).
Condensate Drain
The condensate drain connection of the evaporator is threaded
¾" nominal P.V.C. pipe. Install a condensate trap to ensure
proper condensate drainage (
Figure 11
)
Figure 11: Condensate Drain
DO NOT OVERTIGHTEN DRAIN FITTING