Williams 2001622 Installation & Operating Instruction Manual page 5

State and local authorities have established codes regulating the installation of gas burning equipment. Consult your gas supplier or gas company for
complete information. In the absence of local codes, all aspects of the installation must comply with the National Fuel Gas Code ANSI Z223.1. In
Canada: Follow CAN/CGA-B149.1(2) Canadian Standard.
A. Use 1/2-inch pipe or semi-rigid tubing for natural and liquefied petroleum gasses. DO NOT USE FLEXIBLE HOSE. Appliance connectors of
corrugated metal tubing and fittings that are listed by a nationally recognized testing agency may be used if accepted by the local code authorities.
FOLLOW THE MANUFACTURER'S INSTALLATION INSTRUCTIONS. This type of connection may only be installed in the room where the heater
is located.
B. A manual shutoff valve and union must be installed in the gas supply line just ahead of the connection to the heater. The manual valve must
include a 1/8-inch NPT plugged tapping accessible for connection of a test gauge.
C. Unions in the gas supply lines should be of the ground joint type. Compounds used on threaded pipe joints must be resistant to the action of
liquefied petroleum gases.
WARNING:
WHEN CONNECTING FIELD PIPING, USE A SECOND WRENCH TO KEEP THE HEATER VALVE FROM TURNING. SUPPORT FIELD PIPING
PROPERLY, STRESS AND OVER TIGHTENING COULD DAMAGE THE GAS VALVE AND RESULT IN DANGEROUS GAS LEAKS WHICH CAN
CAUSE DANGEROUS CONDITIONS INCLUDING PROPERTY DAMAGE, BODILY INJURY, AND EVEN DEATH.
D. A drip leg (Figure 2) should be installed to constitute a trap to catch any condensate that may be in the gas. The drip leg should be readily
accessible for cleaning.
E. The heater must be disconnected from the gas supply system and from the heaters individual shutoff valve when the system is tested at a pressure
in excess of 1/2 PSIG.
F. Check all factory and field pipe joints for gas leaks before and after lighting the heater. Use a soap solution. Never use a match or open flame.
Correct any leak (s), no matter how small.
G. Piping supply shall be supported to prevent sagging damage to controls and hazardous gas leaks. To prevent freezing where the supply pipe is
exposed to cold air, wrap the pipe or run it underground.
PIPED
GAS
SUPPLY
TUBING
GAS
SUPPLY
Figure 2
PIPED
GAS
SUPPLY
Gas Piping
IMPORTANT:
All piping must comply with local codes and ordinances or with the
National Fuel Gas Code (ANSI Z223.1 NFPA No. 54), whichever
applies. (In Canada: CAN/CGA B149).
FRONT VIEW
ENCLOSED MODEL SHOWN
4
Figure 3
Figure 4