Bard WG241 Installation Instructions Manual Download

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Manual 2100-365
Page 21

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.

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 shutoff 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.

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 shutoff valve.

TABLE 5

LENGTH OF STANDARD

PIPE THREADS (INCHES)

TABLE 6

GAS PIPE SIZES - NATURAL GAS

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 shutoff 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 shutoff 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.

MIS-897

FIGURE 13

PROPER PIPING PRACTICE