How to Install an Upflow Furnace

The colder winter months prompt many homeowners to turn on their furnaces for warmth. Many furnace types are available, including an upflow configuration. Upflow furnaces pull cool air through the system’s base, systematically warming it. The warm air emits through the furnace’s top and into attached ducting. It may be necessary to replace and install a new upflow furnace after owning a home for many years.

Solvent cement
Ring clamp
Soapy water

Instructions

- 1
  Make sure that the previous furnace location has sufficient spacing surrounding the assembly. Upflow furnaces must have adequate spacing for ventilating hot working parts.
- 2
  Attach the flue vent pipe, typically a PVC pipe, into the upflow furnace’s flue gas output pipe. Apply solvent cement at the pipe's joint and allow it to dry. The flue vent pipe moves hazardous gasses from the furnace area, emitting them outside.
- 3
  Attach the home's ducting to the upflow furnace's warm air outlet. Verify that the duct is attached securely onto the furnace with a ring clamp.
- 4
  Connect the furnace’s condensate drain pipe to the home’s drain system pipe. Verify that the condensate drain is angled downward toward the home drain system for efficient water motion away from the furnace components.
- 5
  Connect the home’s gas line to the furnace. Hand tighten the joint connection. Don't over-tighten with a tool. Over-tightening can cause a possible gas leak from stripped connection threads on the joint.
- 6
  Test for any gas leaks by applying soapy water to the gas connection points. Turn the gas supply on. Any bubbles that appear along the connection indicate a gas leak.
- 7
  Attach the furnace’s electrical wiring to the home’s electrical panel. Each upflow furnace has specific wiring configurations. Consult the manual for particular wiring connections.
- 8
  Turn the furnace on and test its functions.

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