GCVM96 & GMVM96 Installation Instructions

33
HORIZONTAL [UPFLOW MODEL]
MANUAL SHUT-OFF VALVE
(UPSTREAM FROM GROUND
JOINT PIPE UNION)
DRIP LEG
GROMMET IN STANDARD
GAS LINE HOLE
DRAIN TRAP
ALTERNATE GAS
LINE LOCATION
MANIFOLD
PLUG IN ALTERNATE
GAS LINE HOLE
GAS VALVE
BURNERS
A
LT ER N AT E
UNION
LOCATION
GROUND
JOINT
PIPE
UNION
GAS VALVE
BURNERS
MANIFOLD
DRAIN TRAP
ALTERNATE GAS
LINE LOCATION
PLUG IN ALTERNATE
GAS LINE HOLE
HORIZONTAL [COUNTERFLOW]
ALTERNATE
UNION
LOCATION
GROUND
JOINT
PIPE
UNION
DIRECT/STANDARD INLET PIPING
E DGES  OF  SHEET  METAL  HOLES  MAY  BE  SHARP .U SE  GLOVES  AS  A 
PRECAUTION  WHEN  REMOVING  HOLE  PLUGS .
WARNING
When gas piping enters directly to the gas valve through the
standard inlet hole, the installer must supply straight pipe with a
ground joint union to reach the exterior of the furnace. The rigid
pipe must be long enough to reach the outside of the cabinet to
seal the grommet cabinet penetration. A semi-rigid connector to
the gas piping can be used outside the cabinet per local codes.
INDIRECT/ALTERNATE INLET PIPING
When gas piping enters indirectly to the gas valve through the
alternate gas inlet hole the following fittings (starting from the gas
valve) to reach the outside of the cabinet must be supplied:
• Close nipple.
• 90 degree elbow.
• 2½ inch nipple.
• Straight pipe, with a ground joint union, to reach the exterior
of the furnace. The rigid pipe must be long enough to reach
the outside of the cabinet so as to seal the grommet cabinet
penetration. A semi-rigid connector to the gas piping can
be used outside the cabinet per local codes.
GAS PIPING CHECKS
Before placing unit in operation, leak test the unit and gas con-
nections.
T O  AVOID  THE  POSS IBILITY  OF  EXPLOSION  OR  FIRE , NEVER  USE  A  MATCH 
OR  OPEN  FLA M E  TO  TEST  FOR  LEA KS .
WARNING
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).