IM 971-3 • MAVERICK I 10 www.DaikinApplied.com
Mechanical Installation
Gas Supply, Condensate Drain
Gas Connection
DANGER
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:
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
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
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.
Figure 9: Backup Wrench Location
Figure 10: Suggested Gas Piping
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.
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.
Table 5: Gas Pipe Capacity Table (Cu. Ft./Hr.)
Nominal
Iron Pipe
Size
Equivalent Length of Pipe, Feet
10
20
30
40
50
60
70
80
½"
132
92
73
63
56
50
46
43
¾"
278
190
152
130
115
105
96
90
1"
520
350
285
245
215
195
180
170
1¼"
1,050
730
590
500
440
400
370
350
1½"
1,600 1,100
890
760
670
610
560
530
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
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:
Cu. Ft. per Hr. Required =
Gas Input of Furnace (BTU/Hr)
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/Ft3) may be
determined by consulting the local natural gas utility or the LP
gas supplier.
Honeywell
Gas Valve
Rogers White
Gas Valve
MANUAL GAS
SHUT-OFF VALVE
UNION
DRIP LEG
Summary of Contents for Maverick I MPSA008D
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