User's Manual

18
Table 5: Typical Electrical Requirements
Post-Purge Timer:
This furnace is equipped with a post-purge timer located in the blower compartment on the control panel.
It is pre-set at the factory for a 4 minute post-purge. This is designed to ensure that no residual heat or
combustion odors permeate back into the home. The 4 minutes has been deemed sufficient, however if
you experience the need for a longer post-purge, the device has 3 selectable settings; 4 minutes, 5
minutes and 7 minutes. By simply turning the knob to one of the remaining selections the post-purge time
will be effected.
Fig-7A Post Purge Timer
Electronic Air Cleaner (EAC) and Humidifier Installation:
The fan timer on this unit has designated terminals to control the operation of an electronic air cleaner
and/or humidifier. These terminals provide line voltage for the control of these accessories, refer to
Figure 8 on the next page. Connection between EAC and N6 provides a switched 115 vac to power an
electronic fan cleaner. The same-switched 115 vac is available between Fan and N7 and may be used in
conjunction with a humidistat to control a humidifier. These terminals are energized whenever the blower
is active.
Model
Voltage/Frequency
No. of Phases
(V/Hz/Ph)
OHC Full Load
Current (Amps) @
120 VAC
Supply/Return
Air Blower Full
Load Current
(Amps) @ 120
VAC
Oil Burner
Assembly
Full Load
Current
(Amps) @
120 VAC
Maximum
Time Delay
Type Fuse
or Inverse
Time
Circuit
Breaker
Size
(Amps)
Minimum
Recommende
d 75 deg. C.
Copper
Power Wiring
Size (AWG)
12
2.5
7.15 ECM
11.45
120/60/1
OHCFA072DV4
15