MORTEX
INSTALLATION INSTRUCTIONS
DOWNFLOW ELECTRIC FURNACE
A. Introduction
Mortex Downflow Electric Furnaces are specifically
designed for Manufactured Housing applications. The
furnaces are rated at 240 volts, 60 Hz, single phase. 10, 12,
15, 17 and 20Kw models are available. All models have
multi-speed blowers capable of handling a wide range of
BTUs of cooling.
These instructions are primarily to assist qualified
individuals trained and experienced in the proper installation
of this type of equipment. Refer to authorities having
jurisdiction for additional guidance.
B. Rules For Safe Installation And Operation
1. This unit has been designed and manufactured to
comply with National Codes, it is the installers responsibility
to install this unit to comply with National Codes and/or
prevailing local codes and regulations. Mortex assumes no
responsibility for units installed in violation of any code or
regulation.
2. Access for servicing is an important factor in the
location of the furnace. A minimum of 24 inches should be
provided in front of the furnace for access to the heating
elements and controls.
3. This electric furnace is approved for zero (0)
clearance to combustible material on all or any part of the
furnace exterior and the inlet or outlet duct work.
4. Duct work must be installed in accordance with the
standards of the National Fire Protection Association (NFPA)
for the installation of Air Conditioning, Warm Air Heating
and Ventilating Systems (NFPA 90A and 90B). See National
Environmental Systems Contractors Association Manual K for
duct sizing recommendations.
5. Ground the unit to prevent electric shock. All
electrical wiring should be in accordance with the National
electrical Code.
6. The safety testing agency label appearing on these
units covers the unit only. It does not cover any other
equipment.
7. The unit should be unpacked on receipt and if
damage is found, a claim should be made immediately by the
receiver upon the shipping carrier.
C. Physical Installation
Alcove: Must be a minimum of 24 inches deep by 20 inches
wide. Electrical connections are on right side. Door makes
overall depth of unit 25 inches. 24 inches must be clear in
front of the unit to nearest wall or partition. A return air
opening must be provided to allow return air to enter top
opening of furnace. Opening must be a minimum of 200
square inches for heating. Increase to a minimum of 300
square inches for A/C operation. For large A/C or HP
applications a larger opening may be required.
Closet: Must be of sufficient size to allow removal of air filter
and maintenance of the blower in the furnace. If return is in
door or wall below the furnace casing height a minimum of 6
inches clearance must be allowed on that side of furnace to
allow proper air flow to top of the furnace. Return air
openings must be as stated in alcove installation.
Furnace must be positioned to allow the discharge air to flow
unrestricted into the duct below. A metal transition should be
used. Be sure to seal the joints to prevent air leakage.
D. Electrical Wiring
Refer to the units nameplate for specific electrical data.
Caution: Disconnect power at main fuse or circuit breaker
distribution panel before wiring furnace to prevent shock
or fire hazard.
Power wiring
Unit is suitable for use with copper conductors. Tighten all
wire connectors. Take care not to damage heater ceramic
insulators. For correct field wire size see unit nameplate and
field wiring table inside electrical compartment. Use 75
degree C minimum wire if wire must be replaced. Circuit
29may98 61BH0001
