Bard W24G2DA, Installation Instructions Manual

Page: 27 / 69

Manual 2100-592C
Page
27 of 69
8. Refer to Table 6 for gas pipe sizes for natural gas.
If more than one appliance is supplied from a
single line size, capacity must equal or exceed the
combined input to all appliances, and the branch
lines feeding the individual appliances properly
sized for each input.
18. GAS SUPPLY AND PIPING
General Recommendations
1. Be sure the gas line complies with the local codes
and ordinances, or in their absence with the
National Fuel Gas Code, ANSI Z223.1, or Natural
Gas Installation Code, CAN/CGA B149.1, or
Propane Installation Code B149.2, latest edition.
2. A sediment trap or drip leg must be installed in the
supply line to the furnace.
3. A ground joint union shall be installed in the gas
line adjacent to and upstream from the gas valve
and downstream from the manual shut off valve.
4. An 1/8" NPT plugged tapping accessible for test
gauge connection shall be installed immediately
upstream of the gas supply connection to the
furnace for the purpose of determining the supply
gas pressure. This can be omitted if local codes
permit use of plugged tapping in gas valve inlet.
5. Install listed manual shut off valve in the supply
gas line external to and immediately upstream of
the furnace (see Figure 12).
6. Use steel or wrought iron pipe and fittings.
7. DO NOT thread pipe too far. Valve distortion or
malfunction may result from excess pipe within
the control. Use pipe joint compound resistant to
the action of liquefied petroleum gases on male
threads only.
DO NOT use Teflon tape. See Table
5 and Figure 13.
Checking the Gas Piping
Before turning gas under pressure into piping, all
openings from which gas can escape should be closed.
Immediately after turning on gas, the system should be
checked for leaks. This can be done by watching the
1/2 cubic foot test dial and allowing 4 minutes to show
any movement, and by soaping each pipe connection
and watching for bubbles. If a leak is found, make the
necessary repairs immediately and repeat the above
test. The furnace must be isolated from the gas supply
piping system by closing the manual shut off valve on
the combination gas control valve during pressure testing
of the gas supply piping system at pressures up to 1/2
PSIG. The furnace and its individual shut off valve must
be disconnected from supply piping and supply piping
capped during any pressure testing of supply piping
system at test pressures in excess of 1/2 PSIG.
Defective pipes or fittings should be replaced and not
repaired. Never use a flame or fire in any form to locate
gas leaks; use a soap solution.
After the piping and meter have been checked
completely, purge the system of air.
DO NOT bleed air
inside the furnace. Be sure to check and relight all
the gas pilots on other appliances that may have been
extinguished because of interrupted gas supply.
FIGURE 13
Proper Piping Practice
TABLE 5
Length of Standard Pipe Threads (Inches)
TABLE 6
Gas Pipe Sizes – Natural Gas
Pipe Size
Effective Length
of Thread
Overall Length of
Thread
3/8 1/2 9/16
3/4 1/2 - - 9/16 13/16
1 9/16 1
Length
of Pipe –
Feet
Pipe Capacity –
BTU per Hour Input Pipe Size
1/2" 3/4" 1" 1-1/4"
10 132,000 278,000 520,000 1,050,000
20 92,000 190,000 350,000 730,000
30 73,000 152,000 285,000 590,000
40 63,000 130,000 245,000 500,000
50 56,000 115,000 215,000 440,000
60 50,000 105,000 195,000 400,000
70 46,000 96,000 180,000 370,000
80 43,000 90,000 170,000 350,000
100 38,000 79,000 150,000 305,000
MIS-897
THIS PRODUCT MUST BE GAS PIPED
BY A LICENSED PLUMBER OR GAS
FITTER IN THE COMMONWEALTH OF
MASSACHUSETTS.