Heat & Glo AT-ZC Installer's Manual page 14

Step 4
The Gas
Supply Line
GAS VALVE
CONTROL
VALVE
USE A WRENCH ON USE A WRENCH ON
SHUT-OFF VALVE WHEN SHUT-OFF VALVE WHEN
TIGHTENING GAS LINE. TIGHTENING GAS LINE.
MANUAL SHUT-OFF MANUAL SHUT-OFF
VALVE VALVE
FLEX CONNECTOR