18
RP-HRPD-IOM (07-22) 132210-B
Figure 12. Optional Vertical Flue Discharge
Piping Connections
Gas Supply Pressure
The unit is equipped for a maximum gas supply pressure of 1/2 psi, 3 .5 kPa, or 14 IN WC .
NOTES:
Supply pressure higher than 1/2 psi requires the installation of an additional service regulator
external to the unit.
PRESSURE TESTING SUPPLY PIPING
• Test pressures
above
1/2 psi—disconnect the heater and manual valve from the gas supply line
to be tested. Cap or plug the supply line.
• Test pressures
below
1/2 psi—before testing, close the manual valve on the heater.
Gas Supply Piping
⚠ DANGER ⚠
• All components of a gas supply system must be leak tested prior to placing equipment in service.
NEVER TEST FOR LEAKS WITH AN OPEN FLAME. Failure to comply could result in personal
injury, property damage, or death.
• Pipe joint compounds (pipe dope) shall be resistant to the action of liquefied petroleum gas or
any other chemical constituents of the gas being supplied.
•
All piping must be in accordance with requirements outlined in the
National Fuel Gas Code
ANSI/Z223 .1 (latest
edition) or the
Natural Gas and Propane Installation Code
CSA B149 .1 (refer to
section) .
•
Gas supply piping installation should conform with good practice and with local codes .
DETAIL B
DETAIL A
INSTALLATION—CONTINUED
Venting Connections—Continued
