Bard Bayrd Furnace 403293A - Manual (Page 20)

18. 10-turn coil of wire
to fit on ammeter
Room thermostat heat
anticipator setting
19. "U" Tube Water
Manometer with O.V
resolution 0“to 15"
W.C. range
Gas pressure
measurement
20. Slope gauge with
0.01” pressure
measurement taps
and tubing, Oto 1"
W.C. range
Duct work static pressure
21. 2 thermometers Temperature rise measured
with 1 -degree through lurnace
Fahrenheit
resolution, 50
degrees F to 175
degrees F range
22. Stop watch Gas input meter timing
23. Torque wrench
(100 inch-pounds)
Proper screw installation
SICTION 11 — INSTALLING GAS PIPING.
Equipment needed: Save time by getting these tools before
you start: Item number(s) 8,12.13 and 14 listed in Section
10.
A. Preparation.
Gas piping must meet requirements of current National
Fuel Gas Code ANSI Z223.1/NFPA 54 and local codes.
Size of pipe running to furnace depends on:
• Length of pipe;
• Number of fittings;
• Specific gravity of gas;
•
Input requirements fBtuh) of all gas-fired appli­
ances attached to same main supply line.
Refer to current National Fuel Gas Code ANSI Z223.1/
NFPA 54 for correct gas pipe sizing information.
Plan furnace gas supply piping so it will not interfere with
removal of burner assembly, front door or blower door
for servicing.
Always use a pipe thread sealant which is resistant to
propane (LP) gas solvent action. Sparingly apply sealant
to all joints on male threads only, starting two threads
back from end.
B. Installation.
1. Install A.G.A. listed manual shut-off valve in gas
supply line immediately upstream of furnace. Install
1/8" NPT plugged tapping accessible for test gauge
connection. Omit separate, plugged tapping if local
area accepts plugged tapping in gas control inlet.
2. After in-line manual shut-off valve, install a drip leg
(sediment trap) at gas supply line inlet connection to
furnace. A convenient way to do this when you have
reduced bottom clearance, is to make drip leg by
using a 1/2" to Г NPT Tee, Then install a 1-1/2"
long.l” NPT nipple in Tee with a Г NPT pipe cap to
complete drip leg.
3. When using black iron gas pipe, install an A.G.A.
listed ground joint union between drip leg (sediment
trap) and furnace gas control. Locate ground joint
union to allow easy servicing of burner assembly
and gas control.
4. Install gas pipe to inlet side of furnace gas control.
WARNINGS Do not thread gas pipe too far. Do­
ing so may cause gas control to split or crack
which could cause a gas leak or distortion or
malfunction of gas control. Thasa could causa a
firs or explosion resulting in damage, Injury or
death.
5. Isolate gas control from gas supply line pressure
during leak check. Gas supply line test pressure de­
termines how you isolate gas control.
WARNINGS At gas supply line, test pressure
equal to or less than 14 Inches W.C. (1/2 PSI).
Isolate gas control from gas supply line by turning
furnace gas control knob clockwise > to off posi­
tion. Unexpected surges could damage gas con­
trol causing gas to leak, resulting In firs or ex­
plosion.
WARNINGS When test pressure la above 14
Inches W.C. (1/2 PSI), completely disconnect gas
control from gas supply line. Failure to Isolate
gas control from test pressure could damage H,
causing gas to leak, resulting in firs or explosion.
6. Use a commercial soap solution made to detect leaks
and check all gas piping connections. Bubbles indi­
cate gas leakage. Seat all leaks before proceeding.
WARNINGi Never use an open flams to check
for gas leaks. If a leak doss exist, a firs or explo­
sion could occur, resulting In damage. Injury or
death.
Furnace Gas Entry Piping.
1. See below for gas entry holes and knockouts.
a. A 1-1/4* X 2-3/4" knockout in top plate.
b. A 1-1/2" diameter hole and a 1-1/4" x 1-15/16"
knockout in right side of casing.
c. Two 1-5/8" diameter knockouts in left side of
casing.
2. Changing Gas Control Inlet.
You may want to change direction of gas inlet elbow
on gas control. Gas control is shipped for right side
gas entry. If you need top entry, remove the fitting. If
you need left side gas entry, rotate the fitting 180
degrees.
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