Williams AC2030 - Page 17

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Connections between the manual shutoff valve and burner
control assembly can be made with an A.G.A./C.G.A. design
certified flexible connector if allowed by local codes. Drip leg
and ground joint unions are still required.
Tighten all joints securely.
Test all piping for leaks. When checking gas piping to the
furnace with gas pressure less than 1/2 PSI, shut off manual
gas valve to the furnace. If gas piping is to be checked with
the pressure at or above 1/2 PSI, the furnace and manual
shutoff valve must be disconnected during testing. (SEE
WARNING). Apply soap solution (or a liquid detergent) to
each joint. Bubbles forming indicate a leak. Correct even the
slightest leak at once.
FIGURE 14 – Gas Piping
MANUAL SHUTOFF VALVE
18 NPT
PLUGGED
HOLE FOR
TEST
GUAGE
DROP
GROUND JOINT UNION
GAS
VALVE
GAS
VALVE
GAS
VALVE
PIPED GAS SUPPLY
PIPED GAS SUPPLY
TUBING GAS SUPPLY
CAUTION: Shut off the main gas supply before removing the end cap to prevent
gas from filling the work area. Test for gas leakage when installation is complete.
2
CAUTION: All bends in metal tubing must be smooth.
1
2
CAP
2
CAP
WARNING: Danger of property damage, bodily injury or
death. Never use a match or open flame to test for leaks.
Never exceed specified pressures for testing. Higher
pressures may damage the gas valve and cause over-
firing which may result in component(s) failure. Never
attempt start-up of unit before thoroughly ventilating
the area and smelling near the floor for gas odor.
2
CAP
1
HORIZONTAL
3 76.2 MM MINIMUM
3 76.2 MM
MINIMUM
3 76.2 MM MINIMUM
MANUAL SHUTOFF VALVE
MANUAL
SHUTOFF VALVE
NIPPLE
TEE
FITTING
NIPPLE
TEE
FITTING
NIPPLE
RISER
RISER
DROP
HORIZONTAL
GROUND JOINT
UNION
GROUND JOINT UNION
FIGURE 15 – Proper Piping Practice
PROPER PIPE
TRHEADING
INCORRECT
TRHEADING
2 THREADS EXPOSED
SEALANT THIN
ENOUGH TO SHOW
THREADS
OVERTHREADED
SEALANT
TOO THICK
SEALANT
PAST TIP
DAMAGED
THREADS