Gas Supply And Piping - COZY 90N30A Owner's Manual

GAS SUPPLY AND PIPING

The gas piping system must meet the requirements of local
codes or the specifications of the servicing gas supplier. It
must have adequate capacity to supply the floor furnace
and any other appliance within the home with enough
gas to maintain the full rated capacities without excessive
pressure drop when all appliances are operating at full rate.
GAS PIPE SIZES - CAPACITY NATURAL GAS *
INSIDE PIPE DIAMETER
LENGTH OF
PIPE - FEET
1/2"
10 132,000
20 92,000
30 73,000
40 63,000
50 56,000
60 50,000
* Based on heating value of 1,000 value of 1,000 BTU per cubic
foot(specif ic gravity of 0.6) at 0.5 PSIG and a pressure drop of
0.3 inch water column.
GAS TUBING AND PIPE SIZES - CAPACITY PROPANE GAS *
COPPER TUBING
LENGTH
OUTSIDE DIAMETER**
OF PIPE
FEET
1/2" 3/4"
10 92,000 329,000
20 62,000 216,000
30 50,000 181,000
40 41,000 145,000
50 37,000 131,000
60 35,000 121,000
* Undiluted Liquefied Petroleum Gas at 11 inches water column inlet
pressure. Based on a pressure drop of 0.5 inches water column.
** Copper tubing must comply with limitations of NATIONAL FUEL GAS
CODE reference 2.6.3 metallic tubing.
*** Steel pipe should be of at least standard weight (Schedule 40).
Support the piping or tubing at regular intervals with
metal pipe strapping. See charts below.
NOMINAL STEEL PIPE SIZE
1/2"
3/4" or 1"
NOMINAL SIZE OF TUBING O.D.
1/2"
5/8" or 3/4"
3/4" 1"
278,000 520,000
190,000 350,000
CAPACITY
152,000 285,000
BTU/hr
130,000 245,000
115,000 215,000
105,000 195,000
STEEL PIPE
INSIDE DIAMETER***
1/2" 3/4"
275,000 567,000
189,000 393,000
CAPACITY
152,000 315,000
129,000 267,000
114,000 237,000
103,000 217,000
SPACING OF SUPPORTS
6'
8'
SPACING OF SUPPORTS
4'
6'
• Where local conditions include earthquake, tornado,
unstable ground or flood hazards, give special
consideration to increased strength and flexibility
of piping supports and connections. Consult local
authorities for recommendations.
• All unused openings in the piping system must be
securely closed gas-tight.
Refer to Figure 10 for the basic fittings you will need
at the furnace.
1. Use black iron or steel pipe and fittings or other pipe
and fittings that are approved by local codes.
2. Use pipe joint compound that is resistant to the action
of Propane Gas or to any other chemical constituents of
the gases to be conducted through the piping only on
male threads.
3. Use two wrenches when making the connection to the
INPUT
valve to keep from bending the mounting bracket or
manifold pipe. Do not over tighten as damage to the
valve can occur.
4. Provide a 1/8" nominal pipe thread (NPT) plugged
tapping for test gauge connection immediately
upstream of the gas supply connection to the floor
furnace.
5. Provide a sediment trap at least 6 inches long to trap
dirt and moisture. Provide space to permit cleaning
or emptying.
6. Use a ground joint union.
7. Install an approved manual shut-off valve.
BTU/hr
INPUT
TO HEATER GAS
CONTROL VALVE
MANUAL CUT-OFF VALVE
1/8" NPT
PRESSURE TAP
DRIP LEG
GAS FIRED VENTED FLOOR FURNACES
GAS
SUPPLY
LINE
11