01/31/2008
NC805
Electric Furnace/Air Handler – Inlet Cabinets
Factory available accessory cabinets can make the Electro Electric Furnace/Air Handler more effective and
easier to install. Typically these are designed for
upflow
applications.
Side Entry, Filter Cabinet HE-IF-21
Return air duct connection opening is 16” x 19”. There is an access
door on both sides, thus this cabinet can be positioned in any direction
or orientation to the Electric Furnace/Air Handler.
Adjustable rails are provided for standard 2” or 4” pleated filter.
The pleated filter is standard 20” x 20”. Examples include Honeywell
203721, BestAir HW2020, or Grainger
®
6B936.
Comment
– The 3M MERV filter airflow resistance needs to be considered in duct design calculations. Per
specification information from 3M the static pressure drop across the 1”, Series 1000, MERV 11 filter is 0.2” SP.
Heat Pump Coil Cabinet
This can be configured between the Electric Furnace inlet and the filter
cabinet. This section allows for a field installed 20”W x 20-½”D x
20”H (24”H is possible) standard drip pan A-coil. For horizontal
applications the installer furnished coil must have proper drip pan.
Access holes for refrigerant lines need to be cut in as required.
HE-ICC-21
Hydronics Coil and Cabinet
Depending upon capacity size and position, there are two designs available. If standard air conditioning is
desired with this Electric Furnace/Air Handler, the air conditioning coil would be at the outlet of the blower. In
this case the hydronics coil is at the inlet as draw-through. Suggest low or medium temperature applications, do
not use as draw-through with 180° water. 140° to 150° water would be acceptable.
Flat coil
– Typically this is used between the above filter cabinet and
the Electric Furnace/Air Handler.
Nominal Btu/h rating – 45,000
Recommended CFM setup – 1000 min.
Typical inlet water – 120° to 140°
Nominal water flow – 8 GPM
HE-WC-21 or assembly
Larger, 4-row coil
– This cabinet is arranged for side, direct, return
air. The cabinet can be reversed for either left or right side entry. The
inlet for this cabinet is sized for an externally installed packaged return
air filter cabinet – typical 20” x 20” size.
Nominal Btu/h rating – 75,000
Recommended CFM setup – 1200
Typical inlet water – 120° to 140°
Nominal water flow – 12 GPM
HE-IWC-21
Reduced CFM and/or inlet water temperature will reduce Btu/h rating.