Amana CVC96 BB Series Installation Instructions Manual page 24

Gas Valve
This unit is equipped with a 24 volt gas valve controlled
during furnace operation by the integrated control
module. As shipped, the valve is configured for natural
gas. The valve is field convertible for use with propane
gas by replacing the regulator spring with a propane
gas spring from an appropriate manufacturer's propane
gas conversion kit. Taps for measuring the gas supply
pressure and manifold pressure are provided on the valve.
The gas valve has a manual ON/OFF control located on
the valve itself. This control may be set only to the "ON"
or "OFF" position. Refer to the lighting instructions label
or Startup Procedure & Adjustment for use of this control
during start up and shut down periods.
To avoid possible unsatisfactory operation
of equipment damage due to underfiring or
equipment, use the proper size of natural/
propane gas piping needed when running pipe
from the meter/tank to the furnace.
Gas Piping Connections
Natural Gas Capacity of Pipe
In Cubic Feet of Gas Per Hour (CFH)
Length of
"
Pipe in Feet ½
10 132
20 92
30 73
40 63
50 56
60 50
70 46
80 43
90 40
100 38
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on
0.60 Specific gravity Gas)
CFH = BTUH Furnace Input _______________
Heating Value of Gas (BTU/Cubic Foot)
The gas piping supplying the furnace must be properly
sized based on the gas flow required, specific gravity of the
gas, and length of the run. The gas line installation must
comply with local codes, or in their absence, with the latest
edition of the National Fuel Gas Code, NFPA 54/ANSI
Z223.1 or CAN/CSA B149.1-15.
To connect the furnace to the building's gas piping, the
installer must supply a ground joint union, drip leg, manual
shutoff valve, and line and fittings to connect to gas valve.
In some cases, the installer may also need to supply a
transition piece from 1/2" pipe to a larger pipe size.
WARNING
Nominal Black Pipe Size
" "
¾ 1 1¼"
278 520 1050
190 350 730
152 285 590
130 245 500
115 215 440
105 195 400
96 180 370
90 170 350
84 160 320
79 150 305
_________
The following stipulations apply when connecting gas
piping. Refer to Gas Piping Connections figure for typical
gas line connections to the furnace.
• Gas piping must be supported external to the furnace
cabinet so that the weight of the gas line does not
distort the burner rack, manifold or gas valve.
•
Use black iron or steel pipe and fittings for building
piping. Where possible, use new pipe that is properly
chamfered, reamed, and free of burrs and chips. If
old pipe is used, be sure it is clean and free of rust,
scale, burrs, chips, and old pipe joint compound.
•
Use pipe joint compound on male threads ONLY.
Always use pipe joint compound (pipe dope) that is
APPROVED FOR ALL GASSES. DO NOT apply
compound to the first two threads.
•
Use ground joint unions.
•
Install a drip leg to trap dirt and moisture before it can
enter the gas valve. The drip leg must be a minimum
of three inches long.
•
Install a 1/8" NPT pipe plug fitting, accessible for test
gage connection, immediately upstream of the gas
supply connection to the furnace.
•
Always use a back-up wrench when making the
connection to the gas valve to keep it from turning.
The orientation of the gas valve on the manifold must
be maintained as shipped from the factory. Maximum
torque for the gas valve connection is 375 in-lbs;
excessive over-tightening may damage the gas valve.
•
Install a manual shutoff valve between the gas
meter and unit within six feet of the unit. If a union
1 ½"
is installed, the union must be downstream of the
1600
1100 manual shutoff valve, between the shutoff valve and
980
the furnace.
760
•
Tighten all joints securely.
670
• Connection method must be in compliance with all
610
local and national codes. US: National Fuel Gas
560
Code (NFGC) NFPA 54-2015/ANSI Z223.1-2015 and
530
the Installation Standards, Warm Air Heating and Air
490
Conditioning Systems ANSI/NFPA 90B
460
In Canada, CANADA: National Standard of
Canada, Natural Gas and Propane Installtion Code
(NSCNGPIC) CAN/CSA B149.1-15
•
Connect the furnace to the building piping by one of
the following methods:
–
Rigid metallic pipe and fittings.
–
Semi-rigid metallic tubing and metallic fittings.
Aluminum alloy tubing must not be used in exterior
locations. In order to seal the grommet cabinet
penetration, rigid pipe must be used to reach the
outside of the cabinet. A semi-rigid connector to the
gas piping may be used from there.
•
Use listed gas appliance connectors in accordance
with their instructions. Connectors must be fully in the
same room as the furnace.
•
Protect connectors and semirigid tubing against
physical and thermal damage when installed. Ensure
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