Gas Supply, Condensate Drain And Piping; Gas Connection - McQuay Maverick I MPS006AG Series Installation And Maintenance Manual

Figure 10: Roofcurb
NOTE: Remove
shipping boards
from unit before
installing on the
roofcurb.
HOLD
DOWN
BRACKET
TYP. (4) LCS.
GASKET
(FULL PERIMETER
AND ON DIVIDERS.
MUST BE ABOVE DUCT
AND INSULATION
PANEL FLANGES.)
*
NOTE
6-1/4
OVERHANG
THIS END
ONLY
INSULATION PANELS
NAILING STRIP
*
SUPPLY DUCT
*
RETURN DUCT
Gas Supply, Condensate Drain
and Piping

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 pipe inlet opening
provided into the 1/2 inlet valve. See Figure 5 or 8 for
typical piping.
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 12.)
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
IM 861
UNIT
SUPPLY
RETURN
ST-A0801-20-01
Figure 11: Roofcurb
GASKET
NAILER STRIP
DUCT*
ROOFCURB
ROOF
STRUCTURAL
MEMBER*
*BY CONTRACTOR
Figure 12: Suggested Gas Piping
ROOF OR GROUND LEVEL INSTALLATION
FROM GAS
METER
MANUAL GAS
SHUT-OFF
VALVE
*
Factory supplied grommet must be utilized.
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.
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.
TO CHECK FOR GAS LEAKS, USE A SOAP AND
WATER SOLUTION OR OTHER APPROVED
METHOD. DO NOT USE AN OPEN FLAME.
▲ ▲
Do not use an open flame to check for leaks. The use of an
open flame can result in fire, explosion, property damage,
personal injury or death.
ROOFTOP UNIT
1/4 TYP (3) SIDES
*SEE NOTE
COUNTER FLASHING*
INSULATION*
CANT STRIP*
ROOF FELT*
INSULATION*
ROOF DECK*
ST-A0801-20-01
UNIT GAS SUPPLY
CONNECTION
*
!
DANGER
11