GMES96-U Installation Manual

24
• Manual gas shut off valve
A semi-rigid connector to the gas piping can be used
outside the cabinet per local codes. ½" NPT pipe and
fittings are required. Model requires one 90 degree
elbow, one 2" nipple and additional nipple to reach
outside the cabinet.
A semi-rigid connector to the gas piping can be used outside
the cabinet per local codes. From the elbow, the length of
pipe and the fittings required will vary by the side chosen,
location of union and cabinet width. The union may be placed
inside or outside of the cabinet.
Alternate
Gas Line
Location
Plug in
Alternate
Gas Line
Hole
* Ground
Joint
Pipe
Union
Gas Valve
*Ground
Joint
Pipe
Union
Manual Shut Off Valve
(upstream from
ground joint
pipe union)
Grommet
in Standard
Gas Line
Hole
Drip Leg
Burner
Manifold
* NOTE: Union may be inside furnace cabinet where allowed by local codes.
UPFLOW
Figure 28
Manual Shut Off Valve
(upstream from
ground joint pipe union)
Drip Leg
Plug in Alternate Gas Line Hole
Grommet in
Standard Gas Line Hole
Alternate
Union
Location
Burner
Drain Trap
Gas Valve
Plug in Main Gas Line Hole
Manifold
UPFLOW - HORIZONTAL LEFT
Figure 29
GAS PIPING CHECKS
T O AVOID THE POSSIBILITY OF EXPLOSION OR FIRE , NEVER USE A MATCH
OR OPEN FLAME TO TEST FOR LEAKS .
WARNING
Before placing unit in operation, leak test the unit and gas con-
nections.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other ap-
proved testing methods.
T O PREVENT PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE ,
THE FOLLOWING INSTRUCTIONS MUST BE PERFORMED REGARDING GAS
CONNECTIONS , PRESSURE TESTING , LOCATION OF SHUTOFF VALVE AND
INSTALLATION OF GAS PIPING .
CAUTION
NOTE: Never exceed specified pressures for testing. Higher
pressure may damage the gas valve and cause subsequent
overfiring, resulting in heat exchanger failure.
Disconnect this unit and shutoff valve from the gas supply piping
system before pressure testing the supply piping system with
pressures in excess of ½ psig (3.48 kPa).
Isolate this unit from the gas supply piping system by closing its
external manual gas shutoff valve before pressure testing supply
piping system with test pressures equal to or less than ½ psig
(3.48 kPA).
I F THE GAS FURNACE IS INSTALLED IN A BASEMENT , AN EXCAVATED
AREA OR CONFINED SPACE , IT IS STRONGLY RECOMMENDED TO
CONTACT A CERTIFIED CONTRACTOR TO INSTALL A GAS DETECTING
WARNING DEVICE IN CASE OF A GAS LEAK .
WARNING
C IRCULATING A IR & F ILTERS
DUCT WORK - AIR FLOW
N EVER ALLOW THE PRODUCTS OF COMBUSTION , INCLUDING CARBON
MONOXIDE , TO ENTER THE RETURN DUCT WORK OR CIRCULATION AIR
SUPPLY .
WARNING
Duct systems and register sizes must be properly designed for
the CFM and external static pressure rating of the furnace.
Ductwork should be designed in accordance with the recom-
mended methods of “Air Conditioning Contractors of America”
Manual D.
Install the duct system in accordance with Standards of the Na-
tional Board of Fire Underwriters for the Installation of Air Condi-
tioning, Warm Air Heating and Ventilating Systems. Pamphlets
No. 90A and 90B.
A closed return duct system must be used, with the return duct
connected to the furnace. NOTE: Ductwork must never be at-
tached to the back of the furnace. For upflow installations re-
quiring 1800 CFM or more, use either two side returns or bottom
return or a combination of side/bottom. Flexible joints may be
used for supply and return connections to reduce noise transmis-