Gas Supply, Condensate Drain - Daikin Maverick I Installation And Maintenance Manual

Gas Supply, Condensate Drain

Gas Connection
IMPORTANT: Connect this unit only to gas supplied by a
commercial utility.
1
Install gas piping in accordance with local codes and
regulations of the local utility company. In the absence
of local codes, the installation must conform to the
specifications of the National Fuel Gas Code, ANSI
Z223.1 - latest edition.
Note: The use of flexible gas connectors is not permitted.
2
Connect the gas line to the gas valve supplied with unit.
Routing can be through the gas pipe opening shown in
Figure 7 or through the base as shown in
3
Size the gas line to the furnace adequate enough to
prevent undue pressure drop and never less than 1/2".
4
Install a drip leg or sediment trap in the gas supply line
as close to the unit as possible.
5
Install an outside ground joint union to connect the gas
supply to the control assembly at the burner tray.
6
Gas valves have been factory installed. Install a manual
gas valve where local codes specify a shut-off valve
outside the unit casing (see
Figure 7: Suggested Gas Piping
7
Make sure piping is tight. A pipe compound resistant
to the action of liquefied petroleum gases must be
used at all threaded pipe connections.
8
IMPORTANT: Any additions, changes or conversions
required for the furnace to satisfactorily meet the
application should be made by a qualified installer,
service agency or the gas supplier, using factory-
specified or approved parts. In the commonwealth of
Massachusetts, installation must be performed by a
licensed plumber or gas fitter for appropriate fuel.
Daikin IM 972-1
Figure 13.
Figure 7).
Mechanical Installation
IMPORTANT: Disconnect the furnace and its individual
shutoff valve from the gas supply piping during any pressure
testing of that system at test pressures in excess of 1/2 pound
per square inch gauge or isolate the system from the gas
supply piping system by closing its individual manual shutoff
valve during any pressure testing of this gas supply system at
pressures equal to or less than 1/2 PSIG.
Never test for gas leaks with an open flame. It can cause an
explosion or fire resulting in property damage, personal injury
or death. Use a commercially available soap solution made
specifically for the detection of leaks to check all connections
as specified in the "Mechanical Installation" section of these
instructions.
IMPORTANT: Check the rating plate to make certain the unit
is equipped to burn the type of gas supplied. Care should be
taken after installation of this equipment that the gas control
valve not be subjected to high gas supply line pressure.In
making gas connections, avoid strains as they may cause noise
and damage the controls. A backup wrench is required to be
used on the valve to avoid damage.
The capacities of gas pipe of different diameters and lengths in
cu.ft. per hr. with pressure drop of 0.3 in. and specific gravity
of 0.60 (natural gas) are shown in
Table 2: Gas Pipe Capacity Table (Cu. Ft./Hr.)
Nominal Equivalent Length of Pipe, Feet
Iron Pipe
10 20
Size
1/2" 132 92
3/4" 278 190
1" 520 350
1-1/4" 1,050 730
1-1/2" 1,600 1,100
After determining the pipe length, select the pipe size which
will provide the minimum cubic feet per hour required for the
gas input rating of the furnace. By formula:
Gas Input of Furnace (BTU/Hr)
Cu. Ft. per Hr. Required =
Heating Value of Gas (BTU/Ft 3 )
The gas input of the furnace is marked on the furnace rating
plate. The heating value of the gas (BTU/Ft
determined by consulting the local natural gas utility or the
LP gas supplier.
DANGER
Table 2.
30 40 50 60 70
73 63 56 50 46
152 130 115 105 96
285 245 215 195 180
590 500 440 400 370
890 760 670 610 560
3
) may be
80
43
90
170
350
530
9