Intertek MVM97 Series Installation Instructions Manual page 34

When gas line is in the alternate location, swap the position
of the plug and grommet.
UPFLOW - HORIZONTAL LEFT
The gas piping may enter the left or right side of the furnace
cabinet. The installer must supply rigid pipe long enough to reach
the outside of the cabinet to seal the grommet cabinet penetra-
tion. A semi-rigid connector to the gas piping can be used outside
the cabinet per local codes. 1/2" NPT pipe and fittings are re-
quired. For models with an "L" shaped manifold, a 4 1/2"
long nipple is required. For models with a hook shaped manifold, a 2" long nipple is required.
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.
G P C
AS IPING HECKS
Before placing unit in operation, leak test the unit and gas connec-
tions.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other approved
testing methods.
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 1/2 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 1/2 psig (3.48 kPA).
34
Manual Shut Off Valve
(upstream from
ground joint
pipe union)
Figure 37
Alternate
Union
Location
Grommet in
Standard Gas Line Hole
Burners
Gas
Manifold
Valve
Drain Trap
Drip leg may terminate with a 1/2" x 1/8" pipe plug to accommodate
line gas pressure measurement.
COUNTERFLOW - HORIZONTAL RIGHT
E
DGES OF SHEET METAL HOLES MAY BE SHARP
PRECAUTION WHEN REMOVING HOLE PLUGS
T
O AVOID THE POSSIBILITY OF EXPLOSION OR FIRE
OR OPEN FLAME TO TEST FOR LEAKS
Manual Shut Off Valve
(upstream from
ground joint pipe union)
Drip Leg
Plug in Alternate Gas Line Hole
Plug in Main Gas Line Hole
Figure 38
WARNING
. U
SE GLOVES AS A
.
WARNING
,
NEVER USE A MATCH
.