Operating instructions

02/14/2006 8 NI806
Whether this unit is sitting on or attached to an inlet cabinet, field designed inlet cabinet, or horizontal
supports; verify proper support and mechanical strength is provided within the system installation.
Rubber isolation pads should be used where possible to reduce sound and vibration transmission.
WARNING
WHEN HANGING THIS UNIT, THERE MUST BE UNDER SUPPORTS WHICH DISTRIBUTE THE
HANGING CHAINS ACROSS THE SURFACE OF THIS UNIT, DO NOT SIMPLY DRILL A HOLE
AND USE A COUPLE OF HANGING BOLTS.
For information, factory optional inlet cabinets can reduce cost and simplify installation, see previous
pages.
When installing the unit maintain a minimum clearance of 36” in front of the unit for service accessibility.
Upflow, Air Conditioning
As stated above, the return air should enter the bottom of this cabinet. Suggest using Electro bottom filter
cabinet (page 2) or field constructed equivalent. The A-coil will be mounted above the blower in either a
case coil or field constructed plenum.
Upflow, Heat Pump
In this case the HP refrigerant coil must be at the bottom of the blower in order for WarmFlo to properly
add temperature to the heat pump output. Electro inlet cabinet is ideal for using a heat pump A-coil (page
2). This factory available inlet cabinet provides space for standard A-coil and is installed between the
filter/inlet cabinet and the Electric Furnace unit itself.
The cabinet is designed for 20”H A-coil, but for larger A-coils the top can be above this cabinet
approximately 3” (24”).
The outlet of the blower will enter into a plenum and directly into distribution duct.
Downflow, Air Conditioning
Similar to upflow above, the air conditioning coil is positioned at the blower outlet. Depending upon the
coil type and drip pan it is positioned in a field constructed plenum as required.
A typical packaged 20” x 20” filter cabinet could easily be installed at the blower inlet opening.
Downflow, Heat Pump
With the WarmFlo elements down and airflow direction down, the A-coil must be at the top of this unit.
The factory option Heat Pump Coil Cabinet can be used for coils less than 20” high. This is assuming the
heat pump and associated refrigerant coil you are using is designed to drive air “backwards” through the
A-coil and drip pan. Use heat pump manufacturer’s recommendation; however, refrigerant coil must be
on the inlet side of the elements.