MORTEX E30 SERIES User manual

LIST OF SECTIONS
LIST OF FIGURES
LIST OF TABLES
SECTION 1: GENERAL
CONTACT INFORMATION
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 1
DOWNFLOW OR UPFLOW SINGLE OR TWO STAGE ELECTRIC FURNACE WITH:
•FACTORY INSTALLED ELECTRIC HEAT
•NO HEAT MODELS WITH FIELD INSTALLED ELECTRIC HEAT KITS
FOR INSTALLATION ONLY IN HUD MANUFACTURED HOMES PER CONSTRUCTION SAFETY 24 CFR PART 3280
MODELS: E30 SERIES THIS APPLIANCE HAS AN IPX1 RATING
INSTALLATION MANUAL
8 – Line Voltage Wiring...................................................................................10
9 – Thermostat Wiring and Low Voltage Connections......................14
10 – Blower Motor Speed Tap Selection ..................................................19
11 – Blower Performance ..............................................................................21
12 – Final System Checks and Startup......................................................25
13 – Wiring Diagrams......................................................................................26
16 – Control Box Component Locations.....................................................13
17 – Control Box Cover and Circuit Breaker Location ....................................13
18 – 1-Stage Heat & Cool Low Voltage Connections – 1 Transformer..16
19 – 2-Stage Ht/1-Stage Cool Low Voltage Connections – 1 Tfmr .16
20 – 1-Stage Ht/Cool Low Voltage Connections – Separate Tfmrs.17
21 – Low Voltage Connections – Separate Ht/Cool Tstats – 1 Tfmr...17
22 – Heat Pump Low Voltage Connections – 1 Transformer.............17
23 – Heat Pump Low Voltage Connections – Separate Transformers.. 17
24 – Constant Torque Motor Terminals .............................................................. 19
25 – Wiring Diagram - 6 kW Electric Heat......................................................... 26
26 – Wiring Diagram - 8 kW and 10 kW Electric Heat .................................. 27
27 – Wiring Diagram - 12 kW Electric Heat....................................................... 28
28 – Wiring Diagram - 15 kW Electric Heat....................................................... 29
29 – Wiring Diagram - 20 kW Electric Heat....................................................... 30
10 – Typ Heat/Cool Low Voltage Wire Color Codes & Connections...... 18
11 – Typ Heat Pump Low Voltage Wire Color Codes & Connections.... 18
12 – Constant Torque Motor Speed Tap Descriptions................................. 19
13 – Constant Torque Motor Terminal Descriptions..................................... 19
14 – Constant Torque Motor Factory Speed Tap Settings ......................... 20
15 – Blower Performance – 10x9 Blower – 1/3 HP C.T. Mtr ....................... 21
16 – Blower Performance – 10x9 Blower – 1/2 HP C.T. Mtr ....................... 22
17 – Blower Performance – 10x9 Blower – 1/2 HP C.T. Mtr (cont.)......... 23
18 – Blower Performance – 10x9 Blower – 3/4 HP C.T. Mtr ...................... 24
1 – General............................................................................................................1
2 – Safety...............................................................................................................3
3 – Clearances......................................................................................................4
4 – Return Air Requirements & Supply Air Distribution System........5
5 – Downflow Furnace Installation ..............................................................6
6 – Duct Connector Installation ....................................................................7
7 – Upflow Coil Cabinet & Return Air Cabinet Installation ..................8
1. Furnace is rated at 208/240 VAC at 60 Hz.
2. Furnace is the same size for all models.
3. Furnace is designed for A/C or heat pump operation.
4. Hold-down strap furnished with furnace.
5. This furnace is designed for downflow or upflow applications only.
6. This furnace must not be operated with the control box cover
and front access panel removed.
7. This furnace is listed by ETL for the United States and Canada.
8. This air handler is for use at elevations of 10,000 ft (3,048m) or less.
9. This appliance is not to be used by persons (including children)
with reduced physical, sensory or mental capabilities, or lack of
experience and knowledge, unless they have been given
supervision or instruction concerning use of this appliance by a
person responsible for their safety. Children must not be allowed
to play with this appliance.
SAVE THIS MANUAL FOR FUTURE REFERENCE
1 – Furnace Dimensions.....................................................................................2
2 – Clearances to Combustibles.......................................................................4
3 – Service Access Clearances...........................................................................4
4 – Typical Closet Installation............................................................................5
5 – Typical Alcove Installation...........................................................................5
6 – Return Air Grille Frame Assembly....................................................................6
7 – Downflow“A”Coil Return Air Filter Location ..............................................6
8 – Duct Connector Depths.......................................................................................7
9 – Duct Connector and Combustible Floor Base...........................................8
10 – Combustible Floor Base Dimensions ...........................................................8
11 – Duct Connector Dimensions............................................................................8
12 – Typical Upflow Installation................................................................................9
13 – Upflow Coil Cabinet .............................................................................................9
14 – Upflow Furnace and Coil Cabinet..................................................................9
15 – Electrical Power Supply Wire Entrances................................................... 11
1 – Electric Furnace Specifications.........................................................................2
2 – Model Number Nomenclature........................................................................2
3 – Optional Cooling Cabinets & Return Grille Frames................................2
4 – Clearances to Combustibles .............................................................................4
5 – Duct Connector Models......................................................................................7
6 – Wiring Requirements – Single Branch Circuit........................................ 12
7 – Wiring Requirements – Dual Branch Circuit ........................................... 12
8 – Electrical Heat Performance Data................................................................ 12
9 – Low Voltage Wire Gauge and Maximum Lengths............................... 14
The following list includes important facts and information regarding this electric furnace.
Manufactured and Distributed by: Mortex Products Inc www.mortx.com
501 Terminal Rd
Fort Worth, TX 76106
9700771

Coil Cabinet
Model
Front Door
of Cabinet
Open Top 17 3/4in
(450.85m) x 21
3/4in (52.45m)
Maximum Air
Flow
CFM (L/s)
1 inPleated
Air Filter,
in the door
2 in Pleated
Air Filter,
Top of Cabinet
Height, In (m) Depth,
In (m)
Width In
(m) Coil Sizes
97-FLSB-21 Louvered N/A 120 (56.369) 20 x 20 23 1/4 (590.5) 25 (635) 19 3/4 (501.65) All Mortex 96 series
coil will fit in Cabinet
97-FSOB-21 Solid 160 (75.159) 20 x 24 23 1/4 (590.5) 25 (635) 19 3/4 (501.65)
97-FLOB-21 Louvered 180 (849.5054) 20 x 20 20 X 24 23 1/4 (590.5) 25 (635) 19 3/4 (501.65)
97-FLSB-27 Louvered N/A 160 (75.159) 20 x 30 30 1/2 (74.7) 25 (635) 19 3/4 (501.65)
96-97 series coil
and 98 series coil
sizes up to 98-8W7
97-FSOB-27 Solid 160 (75.159) 20 X 24 30 1/2 (74.7) 25 (635) 19 3/4 (501.65)
97-FLOB-27 Louvered 180 (849.5054) 20 x 20 20 X 24 30 1/2 (74.7) 25 (635) 19 3/4 (501.65)
97-FLSB-39 Louvered N/A 180 (849.5054) (2EA) 20 x 20 40 1/4 (1,02.35) 25 (635) 19 3/4 (501.65)
97FSOB-39 Solid 200 (943.8949) 20 X 24 40 1/4 (1,02.35) 25 (635) 19 3/4 (501.65) Frame & Grilles
Non-Cabinet
97-FG-18 Louvered N/A 120 (56.369) N/A N/A 18 (457.2) N/A 19 3/4 (501.65)
97-FG-24 Louvered N/A 160 (75.159) N/A N/A 24 (609.6) N/A 19 3/4 (501.65)
Models ALL ALL ALL
Input kW 6 8 10
With“A”Coil NO NO NO
Air Temperature Rise - F 30-90 35-100 40-100
Air Temperature Rise - C -1.1-32.2 1.6-37.7 4.4-37.7
Designed Max Outlet Air Temp, F/C 180 / 82.22 185 / 85 185 / 85
Blower Size 10 x 9 10 x 9 10 x 9
Max ESP In.W.C./kPa 0.3/0.075 0.3/0.075 0.3/0.075
Thermostat Circuit Electrical Specs. 24 VAC, 60 HZ, 40 VA
Electric Furnace Cabinet Height, In/cm 33 / 83.82 33 / 83.82 33 / 83.82
Models ALL ALL ALL
Input kW 12 15 20
With“A”Coil NO NO NO
Air Temperature Rise - F 30-90 35-100 40-100
Air Temperature Rise - C 1.1-32.2 1.6-37.7 4.4-37.7
Designed Max Outlet Air Temp, F/C 180 / 82.22 185 / 85 185 / 85
Blower Size 10 x 9 10 x 9 10 x 9
Max ESP In.W.C./kPa 0.3/0.075 0.3/0.075 0.3/0.075
Thermostat Circuit Electrical Specs. 24 VAC, 60 HZ, 40 VA
Electric Furnace Cabinet Height, In/cm 33 / 83.82 33 / 83.82 33 / 83.82
E = Electric Furnace
30 = 33 Inches
D=Downow
Type
of Fuel
Cabinet
Height
Type of
Blower Motor
Blower Motor
Speed Taps,
HP and kW
Furnace
Conguration
Heating
Input
Cabinet
Height
Heat
Stage
Revision
Letter
B = Constant Torque
3 = 1/3 HP (0.1865kW)
5 SPD CT
4 = 1/2 HP (0.3730kW)
5 SPD CT
5 = 3/4 HP (0.5595kW)
D = D-Revision
A = Single Stage Heat
B = Two Stage Heat
A = Coil Cabinet Optional
006 = 6 kW Electric Heater
008 = 8 kW Electric Heater
010 = 10 kW Electric Heater
012 = 12 kW Electric Heater
015 = 15 kW Electric Heater
020 = 20 kW Electric Heater
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 2
Figure 1: Electric Furnace Dimensions
Table 3: Optional Cooling Cabinets and Return Air Grille Frames
Table 2: Model Number Nomenclature
Table 1: Electric Furnace Specifications
Furnace Weights
E30B3DxxxA(A,B)D Models – 79 lbs. / 35.834 kg
E30B4DxxxA(A,B)D Models – 81 lbs. / 36.740 kg
E30B5DxxxA(A,B)D Models – 85 lbs. / 38.555 kg
Available Blower Motors
1. Standard Blower Motor - 5 SPD Constant Torque

SECTION 2: SAFETY
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 3
This is a safety alert symbol. When you see this symbol on
labels or in manuals, be alert to the potential for personal injury.
Understand and pay particular attention to the signal words
DANGER, WARNING, or CAUTION.
DANGER: Indicates an imminently hazardous situation, which if
not avoided, will result in death or serious injury.
WARNING: Indicates a potentially hazardous situation, which if
not avoided, could result in death or serious injury.
CAUTION: Indicates a potentially hazardous situation, which if
not avoided, may result in minor or moderate injury.It is also
used to alert against unsafe practices and hazards involving
property damage.
FIRE OR ELECTRICAL HAZARD
Failure to follow the safety warnings exactly could result in serious
injury, death, or property damage.
A re or electrical hazard may result causing property damage,
personal injury or loss of life.
Improper installation may create a condition where the
operation of the product could cause personal injury or
property damage.
Improper installation, adjustment, alteration, service or
maintenance can cause injury or property damage. Refer
to this manual for assistance. For additional information
consult a qualified contractor, installer, or service agency.
This product must be installed in strict compliance with
the installation instructions and any applicable local, state,
and national codes including, but not limited to; building,
electrical, and mechanical codes.
Safety Requirements
1. This electric furnace should be installed in accordance with all
national and local building, safety, plumbing, and wastewater
codes along with all other applicable codes. In the absence of
local codes, install in accordance with the following codes.
• Standard for the Installation of Air Conditioning and
Ventilating Systems (NFPA 90A)
• Standard for the Installation of Warm Air Heating and Air
Conditioning Systems (NFPA 90B)
• National Electrical Code (NFPA 70) (USA)
• Canadian Electrical Code, Part I (CSA C22.1) (CANADA)
• All local codes (State, City, and Township)
NOTE: All applicable codes take precedence over any
recommendation made in these instructions. The
manufacturer assumes no responsibility for air handlers
installed in violation of any code or regulation.
2. Provide clearances from combustible materials as listed under
Clearances to Combustibles.
3. Provide clearances for servicing ensuring service access is
allowed for the control box, electric elements and the blower.
4. Failure to carefully read and follow all instructions in this
manual can result in malfunction of the furnace, personal
injury, property damage and or death.
5. Check the rating plate and the power supply to be sure the
electrical characteristics match.
6. Electric furnace shall be installed so the electrical components
are protected from water.
7. Care should be given when installing and servicing this
furnace due to live electrical components. Some components
may have dual power supplies. Always be sure to disconnect
all fuses or circuit breakers before installing or servicing this
furnace.
8. Only trained and qualied personnel should install repair or
service this furnace. Untrained service personnel can perform
basic maintenance functions such as cleaning of exterior
surfaces and replacing the air lters. Observe all precautions in
these instructions and on the attached labels when working
on this furnace.
9. These instructions cover minimum requirements and conforms
to existing national standards and safety codes. In some
instances, these instructions exceed certain local codes and
ordinances, especially those that have not kept up with
changing mobile home, modular home and HUD construction
practices. These instructions are to be followed and are the
minimum requirement for a safe installation.
10. The size of the system should be based on an acceptable
heat loss calculation for the structure. ACCA Manual J or other
approved methods may be used.
11. All models use a nominal 208/240 VAC, 1- Phase, 60-Hz power
supply.
NOTE: DO NOT CONNECT THIS AIR HANDLER TO A 50 HZ
POWER SUPPLY OR A VOLTAGE ABOVE 250 VOLTS.
12. Ground connections must be securely fastened to the ground
lug located inside the control box.
Inspection
As soon as the furnace is received, it should be inspected for
possible damage during transit. If damage is evident, the extent
of the damage should be noted on the carrier’s freight bill. A
separate request for inspection by the carrier’s agent should be
made in writing. Before installing the furnace, check the cabinet
for screws or bolts which may have loosened in transit. There are
no shipping or spacer brackets requiring removal before startup.
Check to be sure all accessories such as heater kits and coils
are available. Installation of these accessories should be
accomplished before the furnace is set in place or the connecting
of the wiring, ducts, or piping.

SECTION 3: CLEARANCES
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 4
FRONT OF FURNACE
Model Top (in/m) Back (in/m) Sides (in/m) Alcove (in/m) Closet (in/m) Duct (in/m)
AL 6 .0 / 152.4 0.0 / 0.0 0.0 / 0.0 18.0 / 457.2 6.0 / 152.4 0.0 / 0.0
Clearances for Service
Access for servicing is an important factor in the location of any
furnace. Provide a minimum of 24 inches (609.6 mm) in front
of the furnace for access to the control box, heating elements,
and blower. This access may be provided by a closet door or by
locating the furnace so that a wall or partition is not less than 24
inches(609.6mm) from the front access door.
Clearance to Combustibles
This furnace is approved for the clearance to combustible mate-
rial from the furnace exterior and ducts as shown in Table 4 and
Figure 2.
Provisions must be provided for the air in the living spaces to
return to the air handler. Failure to comply may cause a reduction
in the amount of return air available to the blower, causing
reduced air-flow. If a cooling coil is installed on the furnace,
the pressure drop of the coil must be taken into account when
selecting the furnace size and selecting the blower motor speed
taps to assure proper air flow for the system in both the heating
and cooling modes. Reduced air-flow may result in insufficient
heating or cooling of the living space. Reduced air flow may also
cause the air handler to cycle on the heating over-temperature
limit and premature heating element failure in the heating mode
or ice formation on the coil in the cooling mode.
For the furnace to work properly, a closet or alcove where it is
installed must have a minimum total free area opening for the
return air as shown below.
Furnaces With 1/3 HP Blower Motor
• Minimum 200 in² (129,032 mm²) free area opening
• Use Return Grille, A/C Coil Cabinet, or any return grille with a
minimum 200 in² (129.032 mm²) free area opening
Furnaces With 1/2 HP Blower Motor
• Minimum 250 in² (161,290 mm²) free area opening
• Use Return Grille, A/C Coil Cabinet, or any return grille with a
minimum 250 in² (161,290 mm²) free area opening
Figure 2: Clearances to Combustibles
Table 4: Clearances to Combustibles
Figure 3: Service Access Clearances

SECTION 4: RETURN AIR REQUIREMENTS AND SUPPLY AIR DISTRIBUTION SYSTEM
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 5
Furnaces With 3/4 HP Blower Motor
• Minimum 390 in² (251,612 mm²) free area opening
• Use Return Grille, or A/C Coil Cabinet, or any return grille with
a minimum 390 in² (251,612 mm²) free area opening
Top Return Only – Recommended Return Grille Size
CFM / L/s in x in (mm x mm) in² / mm²
800 / 377 20 x 20 (500 x 500) 324 / 209,032
1000 / 472 20 X 25 (500 x 630) 414 / 267,096
1200 / 566 25 X 25 ( 635 x 635) 414 / 267,096
1400 / 661 25 X 30 ( 635 x 760) 644 / 415,483
1600 / 755 25 X 30 (635 x 760) 644 / 415,483
1800 / 843 30 X 30 ( 762 x 762) 784 / 505,805
Louvered Door & Top Return – Recommended Return Grille Size
CFM / L/s in x in (mm x mm) in² / mm²
800 / 377 10 x 20 (250 x 500) 144 / 92,903
1000 / 472 12 X 20 (300 x 500) 180 / 116,129
1200 / 566 14 X 20 (360 x 500) 216 / 139,355
1400 / 661 18 X 20 (460 x 500) 288 / 185,806
1600 / 755 18 X 20 (460 x 500) 288 / 185,806
1800 / 843 20 X 20 (500 x 500) 324 / 209,032
The return air opening can be located in a closet door, side wall
above the furnace cabinet, or in a louvered door on the furnace.
If the opening for the return air is located in the side wall of a
closet or the closet door below the top of the furnace cabinet, a
6 inch (152.4 mm) minimum clearance must be provided on the
side where the return is located to provide for proper air flow
to the furnace return opening. The 6 inch (152.4 mm) minimum
clearance is not required if the return grille is installed above the
top of the furnace cabinet.
Supply Air Distribution System
The furnace with a cooling coil installed is designed to operate
against a maximum of 0.30-inch WC (0.074 kPa) external static
pressure. In order to assure proper air-flow through the furnace
and coil, the air distribution system (duct system) must not
exceed a total static pressure of 0.30-inch WC (0.074 kPa). It is
recommended that the manual “Manufactured Housing Duct
Systems Guide to Best Practices” by Manufactured Housing
Research Alliance (MHI-MHRA) be reviewed before selecting the
air distribution system for use in the application.
Figure 5: Typical Alcove Installation
Figure 4: Typical Closet Installation

SECTION 5: DOWNFLOW FURNACE INSTALLATION
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 6
Installing Downflow Furnace and Return Air Grille Frame
Assembly in Alcove
The Return Air Grille kit is approved for use in an alcove for a
heating only installation without an air-conditioning coil. The
return air grille frame assembly is available in 18”(457.2mm)
height and 24”(609.6mm) height. Follow the steps below to
install the return air grille frame assembly to the furnace.
1. Before installing the return air grille frame on the furnace,
confirm there is enough clearance to install the furnace and
the return air grille assembly.
2. Holes for the electrical and thermostat wiring must be cut
prior to installing the furnace and return air grille.
3. Remove the stretch wrap, top and bottom shipping covers,
and corner posts from the furnace.
4. Remove the furnace front access panel.
5. Remove the return air grille frame assembly from its carton.
6. Set the return air grille frame assembly on the front of the
furnace top cover as shown in Figure 6. Line up the screw
holes in the frame assembly with the screw holes in the
furnace top cover and attach the frame assembly to the
furnace top cover using the provided screws.
7. Slide the furnace onto the floor base. Push the furnace back
until the furnace cabinet is against the rear flange of the floor
base.
8. Secure the furnace cabinet to the floor by drilling two holes
through the furnace base and the floor base in the right and
left front inside corners of the furnace cabinet. Use two screws
to secure the furnace and floor base to the floor.
9. Place the air filter in the filter rack in the louvered door and
install the louvered door on the frame assembly by inserting
the tabs in the bottom of the louvered door into the slots in
the furnace top cover.
10. Secure the louvered door to the frame assembly with the
thumb screw in the top of the door.
Downflow“A” Coil Return Air Filter Rack Assembly For Alcove
or Closet Installations
An air filter assembly is available that attaches to the“A” coil as
shown in Figure 7. This assembly utilizes 2 filters, one for each coil
slab. A return air grille with a sufficient free area opening must be
installed in the closet door or wall of the closet.
Installing the Downflow Furnace and Coil Cabinet in Alcove
and Closet
The downflow coil cabinets are approved for use in an alcove
or closet installations with an approved air conditioning coil.
The downflow coil cabinets are available in 23.25in (590.55mm),
30.50in (774.7mm) and 41.25in (1,047.75mm) height. The furnace
is 33in (838.2mm) in height making the combined furnace and
coil cabinet height 56in (1,422.4mm), 63in (1,600.2mm) and 73in
(1,854.2mm). Follow the steps below to install the coil cabinet
assembly to the furnace.
1. Before installing the coil cabinet on the furnace, confirm there
is enough clearance to install the furnace and the coil cabinet
assembly.
2. Holes for the refrigerant tubing, condensate drain line, line
voltage supply wiring, thermostat wiring, and outdoor unit
control wiring must be cut prior to installing the furnace and
coil cabinet.
3. Remove the stretch wrap, top and bottom shipping covers, and
corner posts from the furnace.
4. Remove the furnace front access panel and lay the furnace on
its back.
5. Remove the coil cabinet from its carton and assemble it per the
instructions.
6. Lay the coil cabinet on its back and place the coil cabinet
flanges against the furnace top cover.
7. Secure the cooling coil cabinet to the top cover of the furnace
using the provided screws.
8. Slide the furnace onto the floor base. Push the furnace back
until the furnace cabinet is against the rear flange of the floor
base.
9. Drill two holes through the furnace base and the floor base at
the right and left front inside corners of the cabinet. Use two
screws to secure the furnace and floor base to the floor.
Figure 7: Downflow“A” Coil Return Air Filter Location
Figure 6: Return Air Grille Frame Assembly

SECTION 6: DUCT CONNECTOR INSTALLATION
D E P T H F R O M F L O O R
T O D U C T - i n ( m m )
D U C T C O N N E C T O R
M O D E L N U M B E R
1 i n ( 2 5 .4 m m ) 9 0 - D C U O - 0 1
2 i n ( 5 0 .8 m m ) 9 0 - D C U O - 0 1
3 i n ( 7 6 .2 m m ) 9 0 - D C U O - 0 1
4 i n ( 1 0 1 .6 m m ) 9 0 - D C U O - 0 1
5 i n ( 1 2 7 .0 m m ) 9 0 - D C U O - 0 2
6 i n ( 1 5 2 .4 m m ) 9 0 - D C U O - 0 2
7 i n ( 1 7 7 .8 m m ) 9 0 - D C U O - 0 2
8 i n ( 2 0 3 .2 m m ) 9 0 - D C U O - 0 2
9 i n ( 2 2 8 .6 m m ) 9 0 - D C U O - 0 3
1 0 i n ( 2 5 4 .0 m m ) 9 0 - D C U O - 0 3
1 1 i n ( 2 7 9 .4 m m ) 9 0 - D C U O - 0 3
1 2 i n ( 3 0 4 .8 m m ) 9 0 - D C U O - 0 3
Duct Connectors
90-DCU0-XX Duct Connectors
A duct connector is used to provide a sealed connection
between the furnace base and a below the floor supply duct
system. The duct connector allows the furnace to be installed
on a combustible floor without the use of a separate sub-base
providing insulation is placed between the duct connector and
the combustible floor. Table 5 shows the duct connector needed
for various applications.
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 7
Table 5: Duct Connector Models
Figure 8: Duct Connector Depths
A duct connector can be installed on combustible flooring
except for carpeting. It is recommended to use insulation
having a rating of R-12 or higher between the floor base
and the combustible floor to prevent the combustible floor
from getting too hot.
Installing the Duct Connector
1. Refer to Figures 8 – 11 for dimensions necessary for duct
connector installation.
2. Attach the four (seal-strip) foam tape gaskets provided with the
duct connector around the perimeter of the duct opening in
the main supply duct trunk to seal between the duct
connector and the top of the duct opening.
3. Insert the duct connector through the opening in the floor
and attach the duct connector to the top of the main trunk
by inserting the tabs through the opening in the top of the
duct and bending the tabs back 90 degrees against the inside
of the duct. Confirm the seal-strip has sealed the area around
the duct connector where it attaches to the main supply duct
trunk.
4. Slit the corners of the duct connector that extend above the
floor and then bend the sides over onto the floor surface.
5. It is recommended to place insulation between the floor base
and the floor when used on a combustible floor to prevent the
combustible floor from getting too hot. Cut the insulation
around the perimeter of the duct connector opening.
6. Install the floor base over the floor opening with the flanges in
the opening facing downward.
7. Insert the four screws provided in the kit through the four holes
in the floor base and drive the screws into the floor to secure
the floor base to the floor.
Additional Duct Connector Installation Information
The duct connector is designed to be installed in place of an
existing duct connector and is designed for use on ducts wider
than 12 inches (304.8mm). When using the duct connector on
narrower ducts, there will be insufficient clearance to bend the
tabs on four sides of the duct connector. Some of the tabs on
the duct connector may need to remain unbent so it fits into
the main trunk. In these cases, the tabs may be attached to the
sides of the main trunk by using sheet metal screws or other
suitable fasteners. Add holes in the tabs for sheet metal screws
by drilling the required screw holes in 3 tabs on each side of the
duct connector. If more than three tabs are needed to provide a
more secure and air-tight connection, drill the remaining tabs so
the additional tabs can also be fastened to the duct with screws.
Use a duct sealer to seal any air leaks between the duct and the
duct connector. High temperature metal tape can also be used
to provide an air seal. The tape should be approved by applicable
national or local codes.

SECTION 7: UPFLOW COIL CABINET AND RETURN AIR CABI-
NET INSTALLATION
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 8
Figure 9: Duct Connector and Combustible Floor Base
Figure 11: Duct Connector Dimensions
Figure 10: Combustible Floor Base Dimensions
Upflow coil and return air cabinets are approved for use in alcove
or closet installations with an approved air-conditioning coil.
Upflow coil cabinets are available in 28”(711.2 mm) and 36”
(914.4 mm) heights. The return air cabinet height for applications
with a 28”(711.2 mm) tall coil cabinet is 20” (508mm) and 24”
(609.6 mm) for applications with a 36”(915.4 mm) tall coil cabinet.
The total height of the furnace, coil cabinet and return air cabinet
is as follows:
Return Air Cabinet Height = 20”(508 mm)
Coil Cabinet Height = 28”(711.2 mm)
Furnace height = 33”(838 mm):
Total Height = 81” (2,057.4 mm)
Return Air Cabinet Height = 24”(609.6 mm)
Coil Cabinet Height = 36”(914.4 mm)
Furnace Height = 33”(838 mm)
Total height = 93” (2,362.2 mm)
Follow the steps below to install the coil cabinet assembly.
1. Before beginning the installation, confirm there is enough
clearance to install the furnace, coil cabinet, and return air
cabinet.
2. Holes for the refrigerant tubing, condensate drain line, line
voltage supply wiring, thermostat wiring, and outdoor unit
control wiring must be cut prior to installing the furnace, coil
cabinet, and return air cabinet.
3. Remove the stretch wrap, top and bottom shipping covers, and
corner posts from the furnace.
4. Remove the furnace front access panel (door) and lay the
furnace on its back.
5. Remove the coil and return air cabinets from their cartons.
6. If required, remove the left or right metal knockout (not both)
in the bottom of the coil cabinet so the refrigerant lines and
condensate drain line can be routed through it. Refer to Figure
13 for location of the metal knockouts.
7. Position the coil cabinet on top of the return air cabinet and
secure it to the return air cabinet with at least 4 field supplied
screws.

E-30
ELECTRIC FURNACE
UPFLOW COOLING
COIL CABINET
RETURN AIR BOX
RETURN AIR FILTER GRILLE
COIL CABINET DOOR WILL
NOT HAVE LOUVERS
FLOOR
CEILING SUPPLY DUCT
SUPPLY DUCT IN ATTIC
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 9
8. The installer must fabricate a duct connector that mounts
below the coil cabinet for a return duct connected to a remote
return air grille. The duct connector must allow for the
refrigerant line set to be in front of the duct connector
plenum.
9. Position the furnace on the top of the coil cabinet as shown in
Figure 14 with the air discharge pointing upward and secure it
to the coil cabinet with the at least 4 field supplied screws.
10. Use the upflow duct connector kit to attach the furnace to the
overhead supply duct.
11. Stand the assembled furnace, coil cabinet, and return air
cabinet up and seal all of the joints with mastic or tape.
12. Insulate the inside of the coil cabinet and the inside of the
solid front door with a minimum 1/2 in (12.7 mm) thick
insulation to prevent condensation from forming on the
outside of the coil cabinet when the system is operating in the
cooling mode.
13. Slide the furnace into position below the supply air duct
and secure the return air cabinet to the floor with at least 4
field supplied screws.
14. Use the duct collar to secure the supply air duct to the top of
the furnace.
When installing the duct collar, do not drive pointed screws
into the control box and make sure no screws are touching
any components or wires.
Figure 12: Typical Upflow Installation
Figure 13: Upflow Coil Cabinet
Figure 14: Upflow Furnace and Coil Cabinet

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 10
SECTION 8: LINE VOLTAGE WIRING
The furnace internal wiring is complete except for the 208/240
VAC power supply and the thermostat wiring. See wiring diagram
and Tables 6 and 7 for wire size, fuse/circuit breaker size, and
ground wire sizes. Power wires can enter through the right side of
the furnace or through the auxiliary entrance located in the bot-
tom of the furnace. When bringing wiring through the side of the
furnace, a cable connector (strain relief) must be installed to hold
wiring in place and to relieve any strain on the wiring.
Single Electrical Power Supply – 5kW, 6kW, 8kW, 10kW
Electric Heat
1. Remove the furnace front access panel.
2. Remove the control box cover.
3. Install a cable connector (strain relief) in the 7/8” (22.2 mm)
diameter hole on the right side of the control box.
NOTE: Do not install the cable connector in the furnace
exterior cabinet hole in the as the sheet metal gauge is too
thin.
4. Strip ½” (12.7mm) of the insulation on the end of each wire.
5. Insert the incoming power supply cable through the hole in
the left side of the casing and through the cable connector.
6. Insert the BLACK wire into the L1 screw terminal on the
circuit breaker and tighten the setscrew until the wire is
securely fastened to the circuit breaker screw terminal.
7. Insert the WHITE or RED wire into the L2 screw terminal on the
circuit breaker and tighten the setscrew until the wire is
securely fastened to the circuit breaker L2 screw terminal.
8. Insert the GREEN ground wire into the ground lug and tighten
the set screw until the ground wire is securely fastened to the
ground lug.
9. Once all of the wiring connections have been made, secure the
incoming power supply cable by tightening the cable
connector around the incoming power supply cable.
10. Refer to Table 6 for the required wire size and required
overcurrent protection (fuse/circuit breaker) size.
Single Electrical Power Supply - 12kW, 15kW, 20kW
Electric Heat
1. Remove the furnace front access panel.
2. Remove the control box cover.
3. Install a cable connector in the 7/8” (22.2 mm) diameter hole on
the right side of the control box.
NOTE: Do not install the cable connector in the furnace exterior
cabinet hole in the as the sheet metal gauge is too thin.
Installation of surge protection circuit breakers is
recommended to prevent supply line power surges to the
furnace. Power surge protection is designed to prevent
voltage spikes that can cause damage to heater contactors
and limit controls. Voltage spikes can weld the contacts of
heat contactors, relays and limit controls closed preventing
them from opening. Welded heat contactor or heat relay
contacts will result in the electric heaters remaining ON after
the blower motor turns o following the end of a heat cycle.
Welded limit control contacts will prevent the limit control
from opening in an overtemperature condition due
to insucient air-ow. Either condition can result in a
hazardous condition which may cause a re, loss of
property or loss of life.
4. Strip ½”(12.7mm) of the insulation on the end of each wire.
5. Insert the incoming power supply cable through the hole in the
right side of the casing and through the cable connector.
6. Insert the GREEN ground wire into the ground lug and tighten
the set screw until the ground wire is securely fastened to the
ground lug.
7. Using Jumpers to Connect Power Supply to Stage 2
Circuit Breaker.
a. Insert the BLACK jumper wire along with the incoming
BLACK power supply wire into the L1 screw terminal on the
top (stage1) circuit breaker and tighten the set screw until
the wires are securely fastened to the top circuit breaker L1
terminal.
b. Insert the other end of the BLACK jumper wire into the L1
screw terminal on the bottom (stage 2) circuit breaker and
tighten the set screw until the wire is securely fastened to
the bottom circuit breaker L1 screw terminal.
c. Insert the WHITE or RED jumper wire along with the
incoming WHITE or RED power supply wire into the L2 screw
terminal on the top (stage 1) circuit breaker and tighten the
set screw until the wires are securely fastened to the top
circuit breaker L2 terminal.
d. Insert the other end of the WHITE or RED jumper wire into
the L2 screw terminal on the bottom (stage 2) circuit breaker
and tighten the set screw until the wire is securely fastened
to the bottom circuit breaker L2 screw terminal.
e. Once all of the wiring connections have been made, secure
the incoming power supply cable by tightening the cable
connector around the incoming power supply cable.
f. Refer to Table 6 for the required wire size and required
overcurrent protection (fuse/circuit breaker) size.
8. Using Jumper Bar Assembly to Connect Power Supply to
Stage 2 Circuit Breaker
NOTE: Use 100-amp 4 Pole Jumper Bar Assembly Part
Number 68BAE001.
a. Remove the jumper bar cover by removing the 2 screws that
secure the cover to the assembly.
b. Insert the 4 copper tabs on the jumper bar assembly into
the L1 and L2 screw terminals on both of the top and
bottom circuit breakers. Tighten the set screws on the screw
terminals until the tabs are securely fastened to all 4 of the
circuit breaker screw terminals.
c. Insert the incoming BLACK power supply wire into the L1
screw terminal on the jumper bar assembly and tighten the
set screw until the wire is securely fastened to the L1 screw
terminal.
d. Insert the incoming WHITE or RED power supply wire into
the L2 screw terminal on the jumper bar assembly. Tighten
the set screw until the wire is securely fastened to the L2
screw terminal.
e. Secure the jumper bar cover to the jumper bar assembly
with the 2 screws removed in Step 6a above.
f. Once all of the wiring connections have been made, secure
the incoming power supply cable by tightening the cable
connector around the incoming power supply cable.
g. Refer to the instructions that came with the jumper bar
assembly for additional installation information.
h. Refer to Table 6 for the required wire size and required
overcurrent protection (fuse/circuit breaker) size.

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 11
Dual Circuit Electrical Power Supply - 12kW, 15kW, 20kW
Electric Heat
1. Remove the furnace front access panel.
2. Remove the control box cover.
3. Install a cable connector in the top 7/8”(22.2 mm) diameter
hole on the right side of the control box.
NOTE: Do not secure the cable connector in the hole in the casing
as the casing sheet metal gauge is too thin.
4. Strip ½” (12.7 mm) of the insulation on the end of each wire.
5. Insert the first wire cable (stage 1 circuit) through the top hole
in the right side of the casing and through the cable connector.
6. Insert the incoming BLACK power supply wire (stage 1 circuit)
into the L1 screw terminal on the top (stage 1) circuit breaker.
Tighten the set screw until the wire is securely fastened to the
top circuit breaker L1 screw terminal.
7. Insert the incoming WHITE or RED power supply wire (stage
1circuit) into the L2 screw terminal on the top (stage 1) circuit
breaker. Tighten the set screw until the wire is securely fastened
to the top circuit breaker L1 screw terminal.
8. Install a cable connector in the bottom 7/8”(22.2 mm) diameter
hole on the left side of the control box.
NOTE: Do not secure the cable connector in the hole in the casing
as the casing sheet metal gauge is too thin.
9. Strip ½” (12.7 mm) of the insulation on the end of each wire.
10. Insert the second wire cable (stage 2 circuit) through the
bottom hole in the left side of the casing and through the cable
connector.
11. Insert the incoming BLACK power supply wire (stage 2 circuit)
into the L1 screw terminal on the bottom (stage 2) circuit
breaker. Tighten the set screw until the wire is securely fastened
to the bottom circuit breaker L1 screw terminal.
12. Insert the incoming WHITE or RED power supply wire (stage 2
circuit) into the L2 screw terminal on the bottom (stage 2)
circuit breaker. Tighten the set screw until the wire is securely
fastened to the bottom circuit breaker L1 screw terminal.
13. Insert the GREEN ground wire from each incoming power
supply cables into each ground lug inside the control box
and tighten the screw terminal on each ground lug to secure
the ground wires to the ground lugs.
14. Once all of the wiring connections have been made, secure the
incoming power supply cables by tightening the cable
connectors around the incoming power supply cables.
15. Refer to Table 7 for the required wire size and required
overcurrent protection (fuse/circuit breaker) size.
IMPORTANT – The circuit breakers in the furnace control
box protect the wiring inside of the furnace in the event of a
short circuit. Additionally, these breakers provide a means of
disconnecting the power to the unit. The circuit breakers in the
furnace control box are not meant to protect the wiring between
the furnace and the main electrical panel. Wire size and overcurrent
protection requirements are shown in Tables 6 and 7. If sheathed
cable is used, refer to NEC National Electrical Code (NFPA 70) or the
Canadian Electrical Code, Part I (CSA C22.1) and any local codes
for additional requirements concerning supply circuit wiring. All
field installed wiring must be rated for 60ºC or higher. Heating
capacities can be found in Table 8.
IMPORTANT – Refer to the NEC National Electrical Code (NFPA 70)
or the Canadian Electrical Code, Part I (CSA C22.1) and local codes
for wiring material requirements.
IMPORTANT – Casing or cabinet must be permanently grounded
in accordance with the National Electrical Code or other
applicable codes.
Figure 15: Electrical Power Supply Wire Entrances

ELECTRIC HEATER PERFORMANCE DATA
Electric Heater Size 6 kW 8 kW 10 kW 12 kW 15 kW 20 kW
Branch Circuit Number 1 1 1 1 2 1 2 1 2
240 VAC, 60 HZ, 1 PH BTU 20,439 27,297 34,121 20,473 20,473 17,027 34,121 34,121 34,121
kW 5.99 8.00 10.00 6.00 6.00 4.99 10.00 10.00 10.00
230 VAC, 60 HZ, 1 PH BTU 18,771 25,070 31,337 18,802 18,802 15,637 31,337 31,337 31,337
kW 5.50 7.35 9.18 5.51 5.51 4.58 9.18 9.18 9.18
220 VAC, 60 HZ, 1 PH BTU 17,174 22,937 28,671 17,203 17,203 14,307 28,671 28,671 28,671
kW 5.03 6.72 8.40 5.04 5.04 4.19 8.40 8.40 8.40
208 VAC, 60 HZ, 1 PH BTU 15,352 20,503 25,629 15,377 15,377 12,789 25,629 25,629 25,629
kW 4.50 6.01 7.51 4.51 4.51 3.75 7.51 7.51 7.51
ELECTRIC HEATER AND BLOWER MOTOR ELECTRICAL SPECIFICATIONS
Electric Heater Size - kW 6 kW 8 kW 10 kW 12 kW 15 kW 20 kW
Electric Heater Load - FLA 25.00 33.33 41.67 50.00 62.5 83.34
AWG AWG AWG AWG AWG AWG
Minimum Wires Size (60° C) #8 #8 #8 #6 #6 #6 #4 #4 #4 #4 #4 #4 #3 #3 #3 #1 #1 #1
Minimum Wires Size Size (75° C) #10 #8 #8 #8 #8 #8 #6 #6 #6 #4 #4 #4 #4 #4 #4 #2 #2 #2
Minimum Wires Size (90° C) #10 #10 #10 #8 #8 #8 #6 #6 #6 #6 #6 #6 #4 #4 #4 #3 #3 #3
Ground Wire Size * * * * * * * * * * * * * * * * * *
Furnace Model E30B3 E30B4 E30B5 E30B3 E30B4 E30B5 E30B3 E30B4 E30B5 E30B3 E30B4 E30B5 E30B3 E30B4 E30B5 E30B3 E30B4 E30B5
Indoor Blower FLA 2.40 3.20 4.10 2.40 3.20 4.10 2.40 3.20 4.10 2.40 3.20 4.10 2.40 3.20 4.10 2.40 3.20 4.10
Minimum Circuit Ampacity 35 36 37 45 46 47 56 57 58 66 67 68 82 83 84 108 109 110
Max Overcurrent Protection Amps 35 40 40 45 50 50 60 60 60 70 70 70 90 90 90 110 110 110
ELECTRIC HEATER AND BLOWER MOTOR ELECTRICAL SPECIFICATIONS
Electric Heater Size - kW 12 kW 15 kW 20 kW
FLA kW FLA kW F L A kW
Heater Load Circuit 1 - FLA / kW 25.00 6.00 41.67 10.00 41.67 10.00
Heater Load Circuit 2 - FLA / kW 25.00 6.00 20.83 5.00 41.67 10.00
AWG AWG AWG
Minimum Wire Size (60° C) Circuit 1 #8 #8 #8 #4 #4 #4 #4 #4 #4
Minimum Wire Size (76° C) Circuit 1 #10 #8 #8 #6 #6 #6 #6 #6 #6
Minimum Wire Size (90° C) Circuit 1 #10 #10 #10 #6 #6 #6 #6 #6 #6
Minimum Wire Size (60° C) Circuit 2 #8 #8 #8 #10 #10 #10 #6 #6 #6
Minimum Wire Size (75° C) Circuit 2 #10 #10 #10 #10 #10 #10 #6 #6 #6
Minimum Wire Size (90° C) Circuit 2 #10 #10 #10 #12 #12 #12 #8 #8 #8
Ground Wire Size *********
Furnace Model E30B3 E30B4 E30B5 E30B3 E30B4 E30B5 E30B3 E30B4 E30B5
Indoor Blower FLA (Circuit 1) 2.4 3.2 4.1 2.4 3.2 4.1 2.4 3.2 4.1
Minimum Circuit Ampacity (Circuit 1) 35 36 37 56 57 58 56 57 58
Minimum Circuit Ampacity (Circuit 2) 32 32 32 27 27 27 53 53 53
Max Overcurrent Protection Amps (Circuit 1) 35 40 40 60 60 60 60 60 60
Max Overcurrent Protection Amps (Circuit 2) 35 35 35 30 30 30 60 60 60
Table 6: Wiring Requirements – Single Branch Circuit
6kW, 8kW and 10kW single-stage models can only be wired as a single branch circuit (single power supply).
+ Refer to the National Electrical Code Table 250-95 for non-sheathed conductor ground wire.
* Ground conductor must be the same size and temperature rating as the other conductors listed in Table 6.
Table 7: Wiring Requirements – Dual Branch Circuit
12kW, 15kW and 20kW two-stage models may have a dual or single branch circuit (dual or single power supply).
A jumper bar assembly or jumper wires are used to connect a single power supply to the stage 2 (bottom) circuit breaker.
+ Refer to the National Electrical Code Table 250-95 for Non-Sheathed Conductor Ground Wire.
* Ground conductor must be the same size and temperature rating as the other conductors listed in Table 7.
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 12
Table 8: Electric Heat Performance Data

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 13
Figure 16: Control Box Component Locations
Casing or cabinet must be permanently grounded in accordance with the National Electrical Code or other applicable codes.
For personal safety, turn the electrical power“OFF” at the
main electrical panel (circuit breaker box) and switch the
furnace control box circuit breakers to the“OFF” position
before attempting any service or maintenance operations.
Homeowners should never attempt to perform any
maintenance which requires opening the furnace control box
cover (See Figure 16).
Figure 17: Control Box Cover & Circuit Breaker Location

Thermostat Wire
Length
Thermostat Wire
Gauge
Thermostat Wire
Maximum Current
Feet/Meters AWG Amps
0-70/21.34 20 3.00
0-112/34.14 18 3.00
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 14
Table 9: Low Voltage Wire Gauge
and Maximum Lengths
Thermostat Wiring
Thermostat wires must on the right side of the furnace cabinet
and must be no smaller than 20 AWG. Refer to Table 9 for
recommended wire gauge, lengths and maximum current for
each wire gauge.
NOTE: The thermostat wire cable must enter only on the left side
of the furnace cabinet into the left side of the control box through
the provided plastic bushing and CANNOT pass through the line
voltage section (right side) of the control box.
NOTE: A 3 Amp slow-blow fuse is located on the left side of the
control box that protects the 24 VAC circuit. Replace this fuse only
with the equivalent 3 Amp glass fuse.
The use of a five-conductor cable from the thermostat to the
furnace is recommended for typical heating or heating/ cooling
installations with a two or three-conductor cable from the furnace
to the cooling-only outdoor unit.
A seven or eight conductor cable from the thermostat to the
furnace is recommended for a typical heat pump installation
with a five-conductor cable from the furnace to the heat pump
outdoor unit.
The thermostat wire colors for typical heating, cooling and heat
pump connections are shown in Tables 10 and 11.
Thermostat Installation
The thermostat should be located on an inside wall in an open
area to more closely regulate average room air, preferably where
there is air movement back to air handler. Locating height of
thermostat is important. If possible, the thermostat should be
located in a hallway upstream from the air handler return airflow,
not within 3 feet of from any windows and 52 to 66 inches above
the floor. DO NOT place the thermostat within three feet of any of
the air-distribution supply air registers.
Maintenance, operating and/ or programming instructions are in
the envelope accompanying the thermostat. Give the envelope to
the homeowner.
SECTION 9: THERMOSTAT WIRING AND LOW
VOLTAGE CONNECTIONS

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 15
Furnace and Outdoor Unit With Separate Transformers
If the furnace and the outdoor unit have separate transformers, it
is important to use a thermostat with isolated heating and cool-
ing contacts“RC”and “RH” to prevent interconnection of Class II
24 VAC systems. Most modern thermostats have separate heating
and cooling contacts for use with homes that have an air handler
and outdoor unit that are completely separate and each have a
24 VAC transformer for system control. These thermostats have a
“RC” terminal for cooling and a“RH”terminal for heating. Connect
the RED wire from the“R” terminal on the outdoor unit to the“RC”
terminal on the thermostat and the“R”terminal from the furnace
low voltage terminal block (LVTB) to the “RH”terminal on the
thermostat. If the “R” circuits from the furnace and outdoor unit
with separate transformers are both connected to the thermostat
“R” terminal, a transformer burnout can occur or the outdoor
unit control system could go into lockout mode. If a furnace and
outdoor unit with separate transformers are being installed and
the thermostat does not have the“RC”and “RH” terminals, a new
thermostat with“RC” and “RH” terminals must be purchased and
installed.
IMPORTANT: Cycle the air handler and outdoor unit separately to
make sure both operate correctly.
Separate Thermostats For Heating and Cooling
If heating and cooling are controlled by separate thermostats, a
thermostat interlock switch (See Figure 21) is required to prevent
the furnace and the outdoor unit from operating at the same time.
When using separate thermostats for heating and cooling,
a thermostat interlock must be placed in the thermostat “R”
circuit. Simultaneous operation of heating and cooling can
result in equipment overheating, equipment damage, and
wasted energy.
Do not connect a wire to the thermostat Y terminal unless
an outdoor unit is installed.
Do not locate thermostat within 3 feet of any of the
following items:
1 Supply air registers
2 Lights or heat lamps
3 Aquariums
4 Televisions, stereo, amplifiers, surround sound systems
5 Stoves or any cooking appliance
6 Refrigerator
7 Washer and/or dryer
8 Hot water tank
9 Any hot water
10 Within 15 feet of an electric space heater
11 Within 2 feet of sunlight
Thermostat Heat Anticipator
Some thermostats have a heat anticipator setting that must be
set to the settings shown below in order to function correctly. If
the heat anticipator setting is too low, the system will short cycle.
If the heat anticipator setting is too high, the system will run
long heat cycles thus causing the temperature to overrun the
temperature setting. This will cause the homeowner or user to
feel too warm by the time the blower completes its cycle and too
cold by the time the system cycles on again. The heat anticipator
should be set to 0.4 for all heating kW’s.
The thermostat may be a“self-setting”type in which no heat
anticipator will be found on the thermostat, eliminating the need
for field adjustment.
Typical Heat/Cool Low Voltage Wiring Connections
1. Remove the front access panel.
2. Remove the control box cover.
3. Install a field supplied grommet in the 3/8”hole on the right
side of the furnace cabinet to protect the thermostat wire
cables.
4. Strip ½” of the insulation from the end of each wire in the low
voltage cables.
5. Insert the wire cables from the thermostat and outdoor
cooling unit through the grommet in the right side of the
furnace cabinet and through the 3/8”strain relief installed in
the control box.
6. Place the thermostat wire cable next to the furnace low
voltage terminal block (LVTB).
7. Connect the RED thermostat wire (24 VAC) to the “R” screw
terminal on the LVTB.
8. Single-Stage Heat Wiring Connection - Connect the WHITE
thermostat wire (heat) to the“W”screw terminal on the
furnace LVTB.
Two-Stage Heat Wiring Connection (12kW – 20kW Only)
- Connect the WHITE wire from the thermostat “W1”terminal
(1st stage heat) to the“W”screw terminal on the furnace
LVTB. Remove the BLACK/W2 wire (2nd stage heat)
connected to the spade terminal on the back of the furnace
LVTB “W”terminal, cut the terminal off, and strip ½”of the
insulation from the end of the wire. Connect this wire to the
BLACK wire from the thermostat W2 terminal with a wire nut.
9. Connect the GREEN thermostat wire (indoor fan) to the“G”
screw terminal on the LVTB.
10. Connect the YELLOW thermostat wire (cool) and the YELLOW
wire from the outdoor unit compressor contactor to the“Y”
screw terminal on the LVTB.
11. Connect BROWN thermostat wire (24 VAC common) and the
BROWN wire from the outdoor unit compressor contactor to
the“C”screw terminal on the LVTB.

G
W
Y
C
R
THERMOSTAT
G
W
W2
Y
C
R
FURNACE
Y
C
COOLING
OUTDOOR SECTION
RH
G
C
Y
Y
RC
THERMOSTAT
R
G
W1W
C
C
FURNACE COOLING UNIT
OUTDOOR SECTION
W2W2
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 16
Typical Heat Pump Low Voltage Wiring Connections
1. Remove the front access panel.
2. Remove the control box cover.
3. Install a field supplied grommet in the 3/8”hole on the right
side of the furnace cabinet to protect the thermostat wire
cable(s).
4. Strip ½” of the insulation from the end of each wire in the low
voltage cable(s).
5. Insert the wire cable(s) from the thermostat and outdoor unit
through the grommet in the right side of the furnace cabinet
and through the 3/8”strain relief installed in the control box.
6. Place the thermostat wire cable next to the furnace low
voltage terminal block (LVTB).
7. Connect the RED wire (24 VAC) from the thermostat “R”
terminal and the RED wire from the“R” terminal on the
outdoor unit control board to the“R” screw terminal on the
LVTB.
8. Connect the WHITE wire (emergency heat) from the
thermostat“W/E”terminal to the “W”screw terminal on the
LVTB.
9. Furnaces with 2-Stage Heat (12kW – 20kW Only): Remove the
BLACK/W2 wire (2nd stage heat) connected to the spade
terminal on the back of the furnace LVTB “W”terminal, cut
the terminal off, and strip ½”of the insulation from the end of
the wire. Connect this wire to the BLACK wire from the
thermostat W2 terminal with a wire nut.
10. Connect the GREEN wire (indoor fan) from the thermostat“G”
terminal to the“G”screw terminal on the LVTB.
11. Connect the YELLOW wire (cool/heat pump heat) from
the thermostat“Y”terminal and the YELLOW wire from the
“Y”terminal on the outdoor unit control board to the“Y”screw
terminal on the LVTB.
12. Connect BROWN wire (24 VAC common) from the thermostat
“C”terminal and the BROWN wire from the“C” terminal on the
outdoor unit control board to the“C” screw terminal on the
LVTB.
13. Connect the ORANGE or BLUE thermostat wire from the
thermostat“O”or “B”terminal to the ORANGE or BLUE
(reversing valve solenoid) wire from the“O”or “B”terminal
on the outdoor unit with a wire nut. The connections (“O” vs.
“B”) will depend on the outdoor unit brand. Refer to the
outdoor unit installation instructions and wiring diagram
before making this connection.
14. If the outdoor unit control board has a terminal for energizing
electric heat during the defrost cycle and this feature is
desired, connect a wire from that terminal to the“W1”terminal
on the LVTB. Refer to the outdoor unit installation manual and
wiring diagram for more information.
Figure 18: Typical Single-Stage Heat and
Cool Low Voltage Connections With Single
Transformer in Furnacees
Figure 19: Typical Two-Stage Heat/Single-Stage
Cool Low Voltage Connections With Single
Transformer in Furnace

RH
G
Y
RC
THERMOSTAT
R
G
WW
FURNACE
COOLING UNIT
OUTDOOR SECTION
24 VAC from outdoor
unit transformer
24 VAC from
Furnace Trans
24 VAC Common
from Furnace Trans
NOTE: Trans=Transformer
24 VAC from outdoor
unit transformer
24 VAC
24 VAC
CC
Y
R
C
G
W
R
HEATING
THERMOSTAT
COOLING
THERMOSTAT
FURNACE
G
W
C
R
C
Y
G
Y
R
CONDENSER
OUTDOOR SECTION
24 VAC
to Furnace Trans
Thermostat
Interlock
Switch
24 VAC Common
to Furnace Trans
Heat
Com
Cool
NOTE: Trans=Transformer
RH
G
W2
Y Y
O/B O/B
RC
THERMOSTAT
R
G
W
W/E
W2
FURNACE
CC
Y
R
W/E
HEAT PUMP
OUTDOOR SECTION
C
RH
G
W2 W2
Y Y
OO
RC RC
THERMOSTAT
R
G
W
W/E
FURNACE
CC
Y
W/E
HEAT PUMP
OUTDOOR SECTION
C
T
Opt.
O.D.
T-Stat
24 VAC to
Furnace Trans
24 VAC
24 VAC
24 VAC Common
to Furnace Trans 24 VAC Common to Heat pump
Trans
24 VAC Common
to Heat pump
Trans
Add Jumper if O.D.T-Stat is not used.
NOTE: Trans=Transformer
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 17
Figure 20: Typical Single-Stage Heat & Cool Low
Voltage Connections With Separate Transformers
in Furnace and Outdoor Unit
Figure 22: Typical Heat Pump Low Voltage
Connections With Single Transformer in Furnace
Figure 21: Typical Low Voltage Connections With
Separate Thermostats For Heating and Cooling
and Single Transformer in Furnace
Figure 23: Typical Heat Pump Low Voltage
Connections With Separate Transformers
in Furnace and Outdoor Unit

THERMOSTAT
WIRE COLOR
DESCRIPTION LETTER
CODE
THERMOSTAT AND
FURNACE CONNECTIONS
OUTDOOR UNIT
CONNECTIONS
RED 24 VAC R R N/A
WHITE 1st Stage Electric Heat W1 W N/A
BLACK 2nd Stage Electric Heat W2 W2 * N/A
GREEN Indoor Fan G G N/A
YELLOW Cooling Y Y (Thermostat Only) Y
BROWN 24 VAC Common C C C
THERMOSTAT
WIRE COLOR
DESCRIPTION LETTER
CODE
THERMOSTAT AND
FURNACE CONNECTIONS
OUTDOOR UNIT
CONNECTIONS
RED 24 VAC R R R
WHITE 1st Stage Electric Heat W1 E (Thermostat) W (Furnace) See Outdoor Unit Instructions
BLACK 2nd Stage Electric Heat W2 W2 * See Outdoor Unit Instructions
GREEN Indoor Fan G G N/A
YELLOW Cooling Y Y (Thermostat Only) Y
ORANGE Heat Pump Reversing Valve (Most Brands) O O (Thermostat Only) O
(See Outdoor Unit Instructions)
BLUE Heat Pump Reversing Valve (Some Brands) B B (Thermostat Only) B
(See Outdoor Unit Instructions)
BROWN 24 VAC Common C C C
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 18
Table 10: Typical Heat / Cool Low Voltage Wire Color Codes and Connections
* For furnaces with 2-stage electric heat (12kW – 20kW), disconnect BLACK wire (2nd stage heat) from spade terminal on the back of the
LVTB “W”terminal and connect to the wire from the W2 thermostat terminal with a wire nut.
Table 11: Typical Heat Pump Low Voltage Wire Color Codes and Connections
* For furnaces with 2-stage electric heat (12kW – 20kW), disconnect BLACK wire (2nd stage heat) from spade terminal on the back of the
LVTB “W”terminal and connect to the wire from the W2 thermostat terminal with a wire nut.

1
2
3
4
5
C
L
G
N
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 19
SECTION 10: BLOWER MOTOR SPEED TAP SELECTION
To avoid personal injury or property damage, make
certain that the motor leads cannot come into contact
with non-insulated metal components of the unit.
Be sure to disconnect the electrical power supply to the
furnace by turning o the circuit breakers for the furnace
in the home’s main electrical panel (circuit breaker box)
and the circuit breaker(s) in the furnace control box
before removing the furnace front access panel and
control box cover.
1. Switch the circuit breakers for the furnace in the main electrical
panel (circuit breaker box) to the“OFF”position and switch the
furnace circuit breaker(s) to the“OFF”position.
2. Remove the furnace front access panel.
3. Remove the control box cover.
4. Disconnect the speed tap wire to be changed from the ¼ in
(6.35 mm) spade terminal on the back of the LVTB and connect
the desired speed tap wire to that spade terminal. Refer to Table
12 for motor speed tap descriptions, Table 14 for factory speed
tap settings, and the furnace wiring diagram for speed tap wire
colors.
5. Reinstall the control box cover.
6. Reinstall the front access panel.
7. Switch the furnace circuit breaker(s) to the“ON”position.
8. Switch the circuit breakers for the furnace in the main electrical
panel to the“ON”position.
Speed Tap 5: High Speed – Cooling or Heat Pump
Heating Modes
Speed Tap 4: Med-High Speed – Cooling or Heat Pump
Heating Modes
Speed Tap 3: Medium Speed – Cooling or Electric Resistance
Heating Modes
Speed Tap 2: Med-Low Speed – Electric Resistance
Heating Mode
Speed Tap 1: Low Speed – Constant Circulation Mode Only
NOTE: DO NOT USE SPEED TAP 1 FOR HEATING OR COOLING
MODES! Speed Tap 1 airflow is approximately 200 CFM. This
is not enough airflow for electric heating, cooling, or heat
pump heating operation. If Speed Tap 1 is used for cooling, the
evaporator will freeze up. If Speed Tap 1 is used for heat pump
heating, the outdoor unit high pressure switch will trip. If Speed
Tap 1 is used for electric resistance heating, the heater over
temperature limits will cycle.
Table 12: Constant Torque Motor Speed Tap Descriptions
Table 13: Constant Torque Motor Terminal Descriptions
Figure 24: Constant Torque Motor Terminals
Terminal Connection
C Speed Tap Common - 24 VAC Common
L Supply Voltage - 240 VAC Line 1
G Ground Connection
N Supply Voltage - 240 VAC Line 2
1 Low Speed Tap - 24 VAC Input
2 Medium-Low Speed Tap - 24 VAC Input
3 Medium Speed Tap - 24 VAC Input
4 Medium-High Speed Tap - 24 VAC Input
5 High Speed Tap - 24 VAC Input

Factory Speed Tap Settings @ .3 ESP with Filter and Coil
Serie Model Sp
Tap
Nom
-Tons CFM Coil Range (See Coil Face Velocity Chart Below ) Max kW Blower Setting
E30B3D xxx
AAD
or
E30B3D xxx
ABD
T-1 1.5 580
96 - Series, 97 - Series , 98 - Series
5
Factory Setting T-5
T-2 2.0 750 8
T-3 2.5 925 8
T-4 3.0 1120 10
T-5 3.5 1300 12
E30B4D xxx
AAD
or
E30B4D xxx
ABD
T-1 2.0 800
96 - Series (Do Not use T-5 w /96 -),
97 - Series , 98-Series
12
Factory Setting T-4
T-2 2.5 950 15
T-3 3.0 1120 15
T-4 3.5 1260 17
T-5 4.0 1380 20
E30B5D xxx
AAD
or
E30B5D xxx
ABD
T-1 3.0 1080
98-Series Only
17
Factory Setting T-3
T-2 3.5 1300 20
T-3 4.0 1440 20
T-4 4.0 1520 20
T-5 5.0 1680 20
E30B3 **** 1/3 HP Motor
E30B4 **** 1/2 HP Motor
E30B5 **** 3/4 HP Motor
(+ ) Metering device , Piston, TXV
(+ + ) Refrigerant Connection, 0P, 2P, 3P, 4P or 6P
xxx Designates Kilowatts, 015 = 15 kW
CFM Shown with Dry Coil and Filter in place , Wet
Coil Correction 4-6%
Electric furnace temperature rise (TR) can be used to determine air flow rate in CFM. The CFM
can then be used to determine velocity across the coil face area using the chart below. For heat
pump applications, disable the heat pump heating mode. Set furnace to run all the heater strips
and then check return air and supply air temperature. The difference is the temperature rise (TR).
CFM = (kW x 3412 ) x (Voltage Correction LessThan 240 V ) x 1.08 / TR
Example: CFM = (15 kW x 3412 ) x .96 x 1.08 / 56 TR
CFM = 51180 x .96 x 1.08 / 56 = 948 CFM
Voltage Correction
< 240 V
.96 = 230 Volts
.92 = 220 Volts
.87 = 208 Volts
Coil Face Velocity Formula & Maximum Allowances
Coil Series CFM
Coil
Face Area
(Sq Ft)
Nominal
Face Velocity
(Ft/Min))
Coil Models (See Note Below )
Maximum
Face Velocity
(Ft/Min)
Note
96-Series
750 3.11 242 96-8(Z,5,G ,8,W )2(+ )-(+ + )P 300 WARNING
Exceeding these
nominal and /
or maximum
allowances may
cause water blow
off from the coil,
which; may damage
furnace, void furnace
warranty and limit
liability from
those damages
925 3.32 279 96-(R,M )(2,3,4)4(+ )-(+ + )P 300
1120 3.56 315 96-8(Z,2,3,4,5,G ,8,W )(3,5)(+ )-(+ + )P 320
1300 4.06 321 96-(8,R,M )(Z,2,3,4,5,G ,8,W )(4,6)(+ )-(+ + )P 325
97-Series 1380 4.44 311 97-(8,R,M )(Z,2,3,4,5,G ,8,W )(5,7)(+ )-(+ + )P 325
98-Series
1440 5.33 270 98-(8,R,M )(Z,2,3,4,5,G ,8,W )(7,10)(+ )-(+ + )P 330
1520 5.78 263 98-(8,R,M )(Z,2,3,4,5,G ,8,W )(8,11)(+ )-(+ + )P 330
1520 6.22 245 98-(8,R,M )(Z,2,3,4,5,G ,8,W )(9,12)(+ )-(+ + )P 330
1680 6.67 252 98-(8,R,M )(Z,2,3,4,5,G ,8,W )(10,13)(+ )-(+ + )P 330
1680 7.11 237 98-(8,R,M )(Z,2,3,4,5,G ,8,W )(11,14)(+ )-(+ + )P 330
1680 7.56 223 98-(8,R,M )(Z,2,3,4,5,G ,8,W )(12,15)(+ )-(+ + )P 330
1680 8.00 210 98-(8,R,M )(Z,2,3,4,5,G ,8,W )(13,17)(+ )-(+ + )P (See Example) 330
Air Velocity Formula : CFM / Coil Face Area = Air Ft/Min Example of Coil Complete Model #98-8G12Y-0P
Note: When setting up the speed tap on the E30B furnaces, the coil face area must be taken in to account so as not to exceed 330 Feet Per Minute of
air across the coil. Any thing higher will blow water off the coil and will be the responsibility of the installing contractor.
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 20
Table 14: Constant Torque Motor Factory Speed Tap Settings