42
SSCBL-RPBL-IOM (10-22) 149159-C
DETAIL B
DETAIL A
INSTALLATION—CONTINUED
Venting Connections (Model RPBL)—Continued
• Optional vertical flue discharge (option CC3):
These power vented furnaces are certified with 4 feet of vertical
pipe connected as shown in
, DETAIL A . The distance is measured from the top of the unit to the bottom
of the vent cap . The vent pipe and supports are field-supplied . Optional vertical vent piping provides compliance
with local codes that require either 10-foot horizontal or 4-foot vertical clearance between the flue outlet and the
fresh air intake of the heating system and/or building . The option package (PN 45021) includes the 5-inch vent cap,
the adapter assembly, and the seal plate as shown in
, DETAIL B . Remove and discard the louvered
discharge grill . Attach venter seal plate and oval adapter assembly with sheet metal screws . Use venter seal plate
as drill template .
Figure 34. 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.
