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PPC-4 POST PURGE KIT
NOTE:
All Oil Fired Appliances must have a post purge kit installed.
Installation of a POST PURGE KIT is REQUIRED for oil fired appliances for the purpose of venting combustion products
after the burner has shut down. This kit has an adjustable thermally activated sensing device that continues to vent the
flue system until the temperature drops below switch opening temperature. (See Chart A)
Pierce a ¼” diameter hole into the vent pipe and mount the POST PURGE SWITCH on the vent pipe between the
barometric draft control and the appliance using the two (2) sheet metal screws. (See Figure 6)
NOTE:
Wire the switch normally open. Refer to Unit Wiring Instructions.
P
OST
P
URGE
T
IME
A
DJUSTMENT
P
ROCEDURE
1. Remove switch cover.
2. Using a screw driver, turn the adjustment screw counterclockwise to increase purge time and clockwise to decrease
purge time. Adjust purge time until no flue gas smell is apparent after venter stops. (See Figure 7)
Figure 6
Figure 7
CHART A
Close on
rise temperature
150°F to
200°F ± 15°F
Open on
fall temperature
95°F to
130°F ± 15°F
Typical post purge time
should be 3 to 5 minutes
