11
diameter with the Riello sidewall vent kit. For Beckett, the combustion air inlet pipe will be reduced to 3”
diameter with the Beckett sidewall vent kit.
The side wall vent may be installed either through the knock-out on the right or left side casing of the unit
or vertically out the top opening of the vestibule.
The combustion air inlet can be installed through the either the lower left side casing knockout or the
lower right side casing knockout.
C. DRAFT REGULATORS:
Note: Do not use with Direct Vent application.
A draft regulator is supplied with the furnace and should be installed according to the regulator
manufacturers recommendations. With the burner operating, use a draft gauge to adjust the regulator to
the proper setting. (refer to the instructions enclosed with draft regulator to adjust to the proper setting).
When the burner air supply and draft are properly adjusted, the over fire draft should be a negative (-).01"
to (-).02" WC, as measured at the 5/16" over fire air tap (See Fig. 12). This tap is provided in the upper
burner mounting plate. To measure the flue draft, punch a small hole in the vent connector pipe as close
to the furnace as possible and always before the draft regulator.
Note: Draft over fire may be positive for high fire applications but not to exceed (+).02" WC.
D. DUCT WORK/AIR CONDITIONING:
If the furnace is used in connection with summer air conditioning (cooling), the furnace should be installed
parallel with or on the upstream side of the evaporator coil to avoid condensation in the furnace heat
exchanger. If the cooling unit is installed with a parallel flow arrangement, dampers or other means used
to control flow of air should be provided to prevent chilled air from entering the furnace. If such a damper
is manually operated, it must be equipped with a means to prevent operation of either unit, unless the
damper is in the full heat or cool position.
The duct system should again follow the current design standard of Air Conditioning Contractors of
America (ACCA) or ASHRAE Fundamentals volume. The most common location for the A-shaped coil (A
style) is shown in Fig. 8.
Fig 8: Acceptable locations for the air conditioner evaporator coil.
NOTICE:
The minimum coil pan clearance for a sectional or drum type heat exchanger is three inches
unless specified otherwise by the individual coil manufacturer.
NOTICE:
The minimum return air temperature is 55° F.
Summary of Contents for OH6FA072D48N
Page 5: ...2...
Page 33: ...30 Heating Speed Set ups 2 Stage OH6FX072DV4 Figure 18 2 ECM 2 stage blower motor speed chart...
Page 64: ...61 VIII Sequence of Operations Flow Chart...
Page 65: ...62...
Page 66: ...63 IX Trouble Shooting Flow Chart...
Page 67: ...64...
Page 68: ...65...
Page 69: ...66...
Page 70: ...67...
Page 72: ...69 Appendix A Replacement Parts Replacement Parts for OH6FA072D...
Page 73: ...70 Replacement Parts for OH8FA119D...
Page 74: ...71 Appendix B Wiring Diagrams OH6FA072D48 PSC Wiring Diagram...
Page 75: ...72 OH6FA072DV4 ECM Wiring Diagram...
Page 76: ...73 OH6FX072DV4 ECM 2 Stage Wiring Diagram...
Page 77: ...74 OH8FA1119D60 PSC Wiring Diagram...
Page 78: ...75 OH8FA1119DV5 ECM Wiring Diagram...
Page 79: ...76...
