Suntherm AHW1 Series User manual

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 1
INSTALLATION MANUAL
LIST OF SECTIONS
LIST OF FIGURES
LIST OF TABLES
SECTION 1: GENERAL
7 – Thermostat Wiring and Connections ..............................................................23
8 – Blower Motor Speed Selection..........................................................................26
9 – Final System Checkout and Start-Up...............................................................26
10 – Blower Performance .............................................................................................28
11 – Wiring Diagrams.....................................................................................................29
21 –TXV Installed in Air Handler ........................................................................................ 14
22 – Flowrator Distributor...................................................................................................... 14
23 – Typical Condensate Trap......................................................................................15
24 – Typical Hot Water Tank and Refrigerant Line Connections.....................19
25 – Typical Hot Water Tank Connections.................................................................... 19
26 – Line Voltage Wire Knockout & Tstat Wire Entrances – AHW1..................19
27 – Line Voltage Wire Knockout & Tstat Wire Entrances – AHW2.................20
28 – Pull-Out Disconnect Location – AHW1 .........................................................20
29 – Component Locations – Electric Heat Control Box ...................................22
30 – Component Locations – No Electric Heat Control Box.............................22
31 – Component Locations – Hydronic Heat Control Box .................................. 22
32 – Heat/Cool Low Voltage Wiring Connections – Single Tfmr ....................24
33 – Heat/Cool Low Voltage Wiring Connections – Separate Tfmrs .............24
34 – Heat Pump Low Voltage Wiring Connections – Single Tfmr ..................24
35 – Heat Pump Low Voltage Wiring Connections – Separate Tfmrs...........24
36 – Constant Torque Motor Terminals....................................................................26
37 – No Electric Heat Wiring Diagram......................................................................29
38 – 3, 5 & 6 kW Electric Heat Wiring Diagram......................................................29
39 – 8 & 10 kW Electric Heat Wiring Diagram........................................................30
40 – Hydronic Heat Wiring Diagram.........................................................................30
10 – Electric Heater Element Capacities.................................................................. 21
11 – Wiring Requirements – 115 VAC – Hydronic Heat...................................... 21
12 – Low Voltage Wire Gauge and Max Lengths.................................................. 23
13 – Air Handler Low Voltage Pigtail Wire Colors/Tstat Connections........... 24
14 – Typical Heat/Cool T-stat Wire Color Codes & Connections...................... 25
15 – Typical Heat Pump T-stat Wire Color Codes & Connections ................... 25
16 – Constant Torque Motor Terminals – Electric & No Heat Models ........... 26
17 – Constant Torque Motor Terminal – Hydronic Heat Models .................... 26
18 – Blower Performance – Without Air Filters..................................................... 28
1 – General..........................................................................................................................1
2 – Safety, General, Dimensional & Model Number Nomenclature ..............2
3 – Air Handler Installation ...........................................................................................6
4 – TXV, Flowrator Distributor, and Refrigerant Lines ...................................... 11
5 – Hydronic (Hot Water) Heat.................................................................................. 15
6 – Line Voltage Wiring................................................................................................ 19
1. Models with electric heat and not heat are rated for 208/240 VAC, 60
Hz, 1-Phase.
2. Models with hydronic heat are rated for 115 VAC, 60 Hz, 1-Phase.
3. Air handler control circuit is rated at 24 VAC, 60 Hz.
4. Air handler size varies by model.
5. Four-wire thermostat operation for heat/cool applications.
6. Seven wire thermostat operating for heat pump applications.
7. Air handler is designed for both cooling only and heat pump
applications.
8. Air handler is designed for upflow applications only.
9. Air handler must not be operated without the access door installed.
10. Air handler is listed by ETL for the United States and Canada.
SAVE THIS MANUAL FOR FUTURE REFERENCE
1 – Air Handler Dimensions.........................................................................................4
2 – Clearance – Access for Service.............................................................................6
3 – Closet Clearances .....................................................................................................7
4 – Air Handler Top Dimensions – AHW1................................................................8
5 – Air Handler Duct Mounting Flange Dimensions...........................................8
6 – Air Handler Base Dimensions ..............................................................................8
7 – Typical Wall Mount Installation ...........................................................................8
8 – Wall Mount Panel Door....................................................................................................9
9 – Typical Wall Mount Installation with Wall Panel Door – AHW1..................9
10 – Typical Wall Mount Installation with Wall Panel Door – AHW2 ................9
11 – Side View For TypicalWall Mount Installation w/ Wall Panel Door – AHW1...9
12 – Side View For TypicalWall Mount Installation w/ Wall Panel Door – AHW2 10
13 – Wall Panel Door Dimensions.................................................................................. 10
14 – Wall Panel Door Frame Dimensions..................................................................... 10
15 – Wall Panel Door Frame Depth ............................................................................... 10
16 – Typical 1”Pleated Air Filter...................................................................................... 10
17 – Refrigerant Lines For Air Handler Below Outdoor Unit........................................11
18 – TXV Bulb Placement ................................................................................................ 12
19 – TXV Sensing Bulb Location .................................................................................... 13
20 – Typical TXV Connections ........................................................................................ 14
1 – Air Handler Specifications......................................................................................4
2 – Dimensional Data......................................................................................................4
3 – Model Number Nomenclature .............................................................................5
4 – Clearances to Combustibles..................................................................................6
5 – AHW2-18, 24-2N and AHW2-18, 24-3N Hot Water Capacities................ 16
6 – AHW2-18, 24-4N and AHW2-30, 36-2N Hot Water Capacities................ 17
7 – AHW2-30, 36-3N and AHW2-30, 36-4N Hot Water Capacities................ 18
8 – Wiring Requirements – 208/240 VAC – No Electric Heat.......................... 20
9 – Wire Requirements - 208/240 VAC Electric Ht – 1 Branch Circuit.......... 21
The following list includes important facts and information regarding this air handler.
Vertical Wall Mount Installation – Models With DX Cooling and Electric or Hot Water Heat
AHW1 and AHW2 SERIES

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 2
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; or for additional information
consult a qualified contractor, installer, or service agency.
FIRE OR ELECTRICAL HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death, or property damage.
A fire or electrical hazard may result causing property
damage, personal injury or loss of life.
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
This air handler should be installed in accordance with all
national and local building/safety codes and requirements, local
plumbing or waste water codes, and 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)
• Canadian Electrical Code, Part I (CSA C22.2) or ANSI/NFPA
No. 70
• All local codes (State, City, and Township)
NOTE: All applicable codes take precedence over any
recommendation made in these instructions. SunTherm
assumes no responsibility for units installed in violation of any
code or regulation.
1. Refer to the Figure 5 of this manual for the bottom return air
opening dimensions for installations with the return air
entering the bottom of the air handler. The plenum must be
installed according to the above listed codes or the
instructions in this manual.
2. Refer to Figure 1, Figure 4, and Table 2 of this manual for the
outlet duct ange dimensions on top of the air handler. The
outlet duct must be installed according to the instructions in’
this manual.
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFC’s and HFC’s) as of July 1, 1992. Approved
methods of reclaiming must be followed. Fines and/or
incarceration may be levied for non-compliance
AHW DX Cooling With or Without Hot Water Heat
AHW DX Cooling With or Without Electric Heat
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.
SECTION 2: SAFETY

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 3
GENERAL INFORMATION
This air handler provides the flexibility for installation in most
upflow or vertical wall mount applications and can be configured
with or without electric heat or with hydronic heat. The constant
torque motor provides a selection of air volume to match most
applications. The air handler may be positioned for bottom air
return or front return.
Inspection
As soon as the air handler 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 air handler, check the
cabinet for screws or bolts which may have loosened in transit.
There are no shipping or spacer brackets that need to be removed
before installation.
Check to be sure all accessories such as heater kits and coils
are available. Installation of these accessories should be
accomplished before the air handler is set in place or the
connecting of the wiring, ductwork, or piping.
See local distributor for more information. Mortex Products, Inc
assumes no liability for freight damage.
3. These models are not ETL listed or approved for installation
into a manufactured (mobile) home.
4. Provide clearances from combustible materials as shown
in Table 4: Clearances to Combustibles and Figure 3: Closet
Clearances.
5. Provide clearances for servicing ensuring service access is
allowed for the control box, electric elements, hot water coil
and the blower (See Figure 2: Clearance - Access for Service).
6. Conrm that the power supply complies with the electrical
characteristics listed on the air handler rating plate.
7. Failure to carefully read and follow all instructions in this
manual can result in malfunction of the air handler, death,
personal injury, and/or property damage.
8. The air handler must be installed so the electrical components
are protected from water.
9. Installing and servicing heating/cooling equipment can be
hazardous due to electrical components.
10. Only trained and qualied personnel should install, repair, and
service heating/cooling equipment. Untrained service
personnel can perform basic maintenance functions such as
cleaning of exterior surfaces and replacing the air lters.
Observe all precautions listed in this manual and on the labels
when installing and servicing this air handler.
11. These instructions cover minimum requirements and conform
to existing national standards and safety codes. In some cases,
these instructions exceed certain local codes and ordinances,
especially those who have not kept up with changing home
and/or HUD construction practices. These instructions are
to be followed and are the minimum requirement for a safe
installation.
12. 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.
13. Models with electric heat use a nominal 208 or 240 VAC, 1-
Phase, 60-Hz power supply.
14. Models with hydronic heat use a nominal 115 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 FOR
ELECTRIC HEAT MODELS OR ABOVE 132 VOLTS FOR
HYDRONIC HEAT MODELS.
15. Ground connections must be securely fastened to the ground
lug located inside the control box.
ALWAYS SHUT OFF ELECTRICAL POWER AT THE PULL-OUT
DISCONNECT (ELECTRIC HEAT MODELS) LOCATED ON THE
AIR HANDLER AND TURN OFF THE CIRCUIT BREAKERS IN THE
MAIN ELECTRICAL PANEL BEFORE PREFORMING ANY SERVICE
ON THE AIR HANDLER.
Hot water from a boiler used to satisfy heating requirements
can be heated to temperatures of 180°F. Parts containing
water this hot can quickly scald. Use extreme caution
when servicing or performing maintenance on any parts
containing hot water.

Model
No. Nominal Tons Blower Code
Blower
Motor
HP
Cooling
Blower
Speed
Tap
Blower
Size
Nominal
Cooling
CFM @
0.30 inwc
ESP With
Coil
Nominal
Heating
Speed
(CFM) @
0.30 inwc
ESP /
Speed Tap
Electric
Heater
Kw
Voltage / PH /
HZ
Thermostat
Circuit
Voltage /
PH / HZ
Max.
External
Static
Duct
Pressure
(in.
W.C.)
AHW1 1.5 - 2.0 LM 1/3 5 10 x 7T 850 600 / 2 * 0 - 8 208-240 / 1 / 60 24 / 1 / 60 0.30
AHW1 2.5 LG 1/3 5 10 x 7T 1000 750 / 1 0 - 8 208-240 / 1 / 60 24 / 1 / 60 0.30
AHW1 3 LI 1/2 5 10 x 8T 1250 975 / 1 0 - 10 208-240 / 1 / 60 24 / 1 / 60 0.30
AHW2 1.5 - 2.0 LK 1/2 5 10 x 8T 1100 830 / 1 N/A 115 / 1 / 60 24 / 1 / 60 0.30
AHW2 2.5 - 3.0 LL 1/2 5 12 x 8T 1235 796 / 1 N/A 115 / 1 / 60 24 / 1 / 60 0.30
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 4
Table 1: Air Handler Specifications
AHW1 Electric Heat AHW2 Hydronic Heat
Figure 1: Air Handler Dimensions
Table 2: Air Handler Dimensional Data
*Indicates minimum heating speed tap for that blower motor code. Do not use a lower speed tap for the heating speed as it will result in
insufficient airflow and possible safety limit tripping.
Available Blower Motors
1. Blower Motor – 1/3 HP 5 Speed Constant Torque
2. Blower Motor – 1/2 HP 5 Speed Constant Torque
Cabinet Dimensional Data in inches
Model A B C D E
AHW1 22 15.75 14 11 36
AHW2 22 15.75 20 10 39

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 5
AHW Vertical Wall Mounted Air Handler
DX Cooling / Electric Heat / Hot Water
Air Handler
Unit Type
AHW - Vertical Wall Mount
Example: 24 - 24,000 btu
Condential
B - Breaker
1 - DX Coil with Electric Heat
2 - DX Coil with Hot Water Heat
A - 115V (Hot Water Heat)
C - 208/240V (Electric Heat)
D - R410a 1.5 thru 2.5 tons
Y - R410a 3 ton
LG - 1/3 HP, 208/240V, Constant Torque, with 10 x 7T blower assembly
LM - 1/3 HP, 208/240V, Constant Torque, with 10 x 7T blower assembly
LI - 1/2 HP, 208/240V, Constant Torque, with 10 x 8T blower assembly
LK - 1/2 HP, 115V, Constant Torque, with 10 x 8T blower assembly
LL - 1/2 HP, 115V, Constant Torque, with 12 x 8T blower assembly
00 - Electric Heating Capacity (kW)
2P - 2 Row Hot Water Coil
3P - 3 Row Hot Water Coil
4P - 4 Row Hot Water Coil
2N - 2 Row Hot Water Coil No Pump
3N - 3 Row Hot Water Coil No Pump
4N - 4 Row Hot Water Coil No Pump
Standard Features:
Factory Installed TXV
Factory Installed Time Delay Relay (TDR)
Factory Installed Disconnect
Front“Return Air”Application
Optional Features:
BR - Solid Front Panel (Bottom “Return Air” Application)
AWH 1 24 1 C LG 03 D
Series
Nominal Cooling BTUs
Unit Voltage
Blower Motor & Blower Package
Heating Capacity
TXV Code
Options / OEM Manufacturers Code
Slant Coil Conguration (Rows, FPI, Ried/Smooth, Fin Type, Etc.)
Table 3: Model Number Nomenclature

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 6
Table 4: Clearances to Combustibles
Figure 2: Clearance – Access for Service
The air handler can be installed in a closet, an alcove, a framed
in wall mount, or in a basement. The air handler must be level to
allow for proper condensate drainage.
Air Handler Orientation (Upflow Only):
This air handler is designed to be installed in an upflow air flow
position only. It must not be installed in horizontal or downflow
applications.
Location
Access for servicing is an important factor in the location of any
air handler. Provide a minimum of 30 inches in front of the air
handler for access to the control box, heating elements, hot water
coil, blower and air filters. This access may be provided by a closet
door or by locating the air handler so that a wall or partition is not
less than 30 inches from the front access panel.
Location is usually predetermined. Check with owner’s or dealer’s
installation plans before installation. If a location has not been
determined, consider the following in choosing a suitable
location.
1. Select a location with adequate structural support, space for
service access, clearance for return and supply duct
connections.
2. Normal operating sound levels may be objectionable if the
air handler is placed directly over or under some rooms such as
bedrooms, study, etc.
3. Caution should be taken to locate the air handler so that supply
ducts are about the same length to achieve even air distribution
of supply air to the living spaces.
4. Locate the air handler where electrical supply wiring can be
easily routed to main electrical panel and where electrical
wiring will not be damaged.
5. Locate the air handler where the thermostat wiring can be
easily routed to the thermostat and where the wiring will not be
damaged.
6. Locate the air handler where the refrigerant lines can be easily
routed to the outdoor unit.
7. Locate the air handler where the condensate lines can be easily
routed to an available drain or to the exterior of the building.
Route condensate drain piping so it does not obstruct access to
the air filter or servicing of the air handler.
8. When the indoor coil is installed in a draw-through application
as is the case with this air handler, a negative pressure will
be created in the condensate drain system. To assure proper
condensate drainage and to prevent condensate from being
drawn into the air handler, the primary and secondary
(overflow) condensate drains must be trapped as described in
Section 5: Air Handler Installation and Figure 25 in these
instructions. If the secondary drain is not used, it must be
capped.
9. The exterior surface of air handler cabinet will likely sweat
when it is installed in a non-conditioned space such as an attic
or garage. The installer must install an auxiliary drain pan under
on all air handlers installed in a non-conditioned space to
prevent damage from condensation runoff.
10. It is recommended that air handlers installed in non
conditioned spaces be insulated on the exterior of the entire
cabinet, including the front access panel with one (1) inch
thick fiberglass with the vapor barrier on the outside. Some
states, cities and counties require additional insulation to be \
installed on the exterior casing of the air handler installed in
an unconditioned space to prevent sweating. Refer to the
state, city, county or local code for insulation requirement to
be sure the installation is in compliance.
Clearances
This air handler is approved for zero (0) inches clearance to
combustible material on any part of the air handler exterior
casing and the inlet or outlet ducts providing no electric heater
is being used. There is a one (1) inch clearance requirement on
the supply air duct or plenum when an electric heater is installed
in the air handler. Refer to Table 4 and Figure 4 for clearance to
combustibles information.
SECTION 3: AIR HANDLER INSTALLATION
FRONT OF FURNACE
Model Top (in) Back (in) Sides (in) Wall Panel Door (in) Alcove (in) Closet Door (in) Duct (in)
AHW 0 0 0 6 30 6 1

SUPPLY AIR DUCT 1" Clearance between the wall
WALL WALL
FLOOR
0" Clearance to the sides
and the supply air duct.
of the air handler and the wall
1" Clearance between the wall
0" Clearance to the sides
and the supply air duct
of the air handler and the wall
1" clearance between supply air
duct and combustible material
must be maintained for the first
36" of the supply air duct.
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 7
Return Air and Filter Requirements
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 and improper heating or cooling of the living
space. The reduced air flow may also cause the air handler to cycle
on the heating over-temperature limit and premature heating
element failure.
For wall mount installations, the front return air opening and
internal return air filter is utilized. For closet installations, the front
return air opening and internal return air filter may also be utilized
if the closet door has a sufficiently sized return air grille with at
least 6 inches of clearance between the closet door and the front
of the air handler to allow the free flow of return air into the air
handler. The closet door grille must have a minimum amount
of total free area opening for the return air to pass through
unrestricted.
For AHW Air Handlers With 1/3 HP Blower Motor
• Minimum 200 in² free return air grille area opening
For AHW Air Handlers With 1/2 HP Blower Motors
• Minimum 250 in² free area return air grille opening
Recommended Closet Door Return Grille Size
800 CFM – 20 X 20 Grille – 324 in²
1000 CFM – 20 X 25 Grille - 414 in²
1200 CFM – 25 X 25 Grille - 414 in²
NOTE: Installation codes may limit the installation to a single level
residence when no return air duct is used.
Closet installations may also utilize the bottom return air opening
with a return duct located in the floor or platform under the air
handler. Basement installations require the air handler to be
installed on a return air base or enclosed platform for the return
air duct to connect to.
Bottom return applications require the bottom return opening
block-off panel to be removed and the installation of a field
fabricated sheet metal block-off panel to cover the front return
opening. The bottom return opening block-off panel can be
removed by cutting the tabs that attach it to the air handler. For
bottom return applications, a return air filter grille attached to the
return duct may be used instead of the factory installed internal
air filter.
NOTE: If a return air filter grille or return air base with an integral
filter is utilized, remove the factory internal filter when the air
handler is installed.
If a return air filter grille or return air base with integral filter is
utilized, follow the minimum filter sizing requirements below.
Standard Disposable Air Filter @ 300 ft/min or less
800 CFM = 20 x 20 x 1
1000 CFM = 20 x 25 x 1
1200 CFM = 20 x 30 x 1
Pleated Disposable Air Filter @ 500 ft/min or less
800 CFM = 16 x 16 x 1
1000 CFM = 18 x 20 x 1
1200 CFM = 20 x 20 x 1
Supply Air Duct
The supply air outlet is located on the top of the air handler.
Connect a supply air duct/plenum system to the supply air outlet
flanges around the supply air outlet. See Figure 1, Figure 4, and
Table 2 for the supply air opening dimensions. Use a non-tape
sealant such as mastic or an aerosol sealant to prevent duct
leakage.
Wall Mount Installations
This air handler is designed for recessed mounting in a wall or for
hanging on the wall in a closet. Recessed mounted air handlers
must be supported by 2x4 header between 2x4 studs as shown
in Figure 8 below. Use the factory provided nail holes in the
front edge of the air handler to attach cabinet to the framed
opening. Be careful to locate the air handler so the drywall surface
will be flush with edges of cabinet, permitting the wall panel
accessory to be attached to cover the opening and edges of the
drywall. Consider the routing of the electrical wiring, refrigerant
lines, condensate lines, and hot water piping when framing the
opening and cut the necessary holes prior to installing the air
handler.
Closet Installations With Bottom Return Air
For closet installations that utilize the air handler bottom return
air opening, the air handler may be installed directly on the
floor or on a platform framed within the closet with a return air
opening cut in the floor or platform for the return air plenum or
duct. Cut the holes in the floor or ceiling for the refrigerant tubing,
electrical wiring, thermostat wiring, and outdoor unit control
wiring and cut the hole(s) for the condensate drain line(s) in the
floor or wall prior to installing the air handler. Bottom return
installations require the use of a non-tape sealant such as mastic
or an aerosol sealant to seal between the air handler and the floor
or platform to prevent air leakage.
Figure 3: Closet Clearances

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 8
Figure 4: Air Handler Top Dimensions –AHW1 Figure 6: Air Handler Base Dimensions
Figure 5: Air Handler Duct Mounting Flange Height
Figure 7: Typical Wall Mount Installation

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 9
Figure 9: Wall Mount Installation With Wall Panel
Door - AHW1
Figure 10: Wall Mount Installation With Wall Panel
Door - AHW2
Figure 8: Wall Panel Door
Figure 11: Side View For Typical Wall Mount
Installation With Wall Panel Door - AHW1

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 10
Figure 12: Side View For Typical Wall Mount
Installation With Wall Panel Door - AHW2
Figure 13: Wall Panel Door Dimensions
Figure 15: Wall Panel Door Frame Depth
Figure 14: Wall Panel Frame Dimensions
Figure 16: Typical 1” Pleated Air Filter

CONDENSING UNIT
LIQUID LINE
SUCTION LINE
EVAPORATOR COIL
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 11
SECTION 4: TXV, FLOWRATOR DISTRIBUTOR,
AND REFRIGERANT LINES
DX Refrigerant Piping:
Air handlers with DX type indoor coils require liquid and suction
lines sized in accordance with outdoor unit manufacturer’s
instructions. The refrigerant lines enter the air handler through
the slot located on the left side of the air handler top behind the
electrical power entrance and connect to the suction and liquid
line stubs located to the left of the blower. The ends of the copper
stubs must be cut off with a tubing cutter and deburred prior to
connecting the refrigerant lines.
NOTE: The air handler is shipped with a pressurized nitrogen
holding charge. Remove the cap from the pressure port located
on the suction line stub and depress the Schrader valve to release
the pressure before cutting the ends off of the stubs.
Refrigerant lines should be soldered with silver solder or high
temperature brazing alloy. The suction line must be insulated
to avoid condensate from forming and dripping off. Armaflex
(or equivalent) with 3/8”(1 cm) minimum wall thickness is
recommended. Suction line insulation in applications with severe
conditions such as hot and/or high humidity require 1/2”(1.3
cm) minimum wall thickness. If outdoor unit is installed above
air handler coil, oil traps are required at equal intervals along
suction line (See Figure 19). Horizontal suction lines should
slope downward 1 inch for every 20 feet toward outdoor unit.
Dry nitrogen must be flowed through refrigerant lines during
soldering operation to prevent copper oxide from forming inside
the tubing which can plug TXV inlet screens and filter driers
• Install 1 oil trap for a height difference of 15 ft to 25 ft
(4.6 m to 7.6 m) between indoor and outdoor units.
• Install 2 oil trap for a height difference of 26 ft to 50 ft
(7.9 m to 15.2 m) between indoor and outdoor units.
• Install 3 oil trap for a height difference of 51 ft to 100 ft
(15.5 m to 39.5 m) between indoor and outdoor units.
• Install 4 oil trap for a height difference of 101 ft to 150 ft
(30.8 m to 45.7 m) between indoor and outdoor units.
Figure 17: Refrigerant Lines For Air Handler
Below Outdoor Unit
SPECIAL INSTRUCTIONS FOR COILS WITH
THERMAL EXPANSION VALVES (TXV)
The thermal expansion valve (TXV) used in this air handler has a
built-in check valve making it heat pump capable. The external
equalizer line attached to the TXV has a female flare nut with built
in Schrader valve depressor that attaches to the Schrader valve
port located on the indoor coil suction manifold.
A TXV has a thermostatic element separated from the valve body
by a diaphragm and is designed to regulate the rate at which
refrigerant flows into the indoor coil.

MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 12
The best location for the TXV sensing bulb is on a horizontal
section of the suction line tube and positioned between 10
o’clock and 2 o’clock on the tube. (See Figures 8 and 9).
NOTE: The sensing bulb must never be located at the bottom of
the suction line due to the possibility of oil and refrigerant laying
in the bottom of the pipe causing false signals.
The sensing bulb must be able to sense the temperature of the
superheated suction vapor and must therefore not be located in
a position that will expose it to extraneous heat/cold. The sensing
bulb must be insulated to isolate it from the surrounding air. The
TXV must be the proper size and type to achieve the performance
ratings of the system.
NOTE: If a non-bleed type TXV is used, the outdoor unit may
require a hard start kit to allow the compressor to start under load.
How the TXV Controls Superheat
The TXV is a precision device designed to regulate the rate at The
The ideal location for the TXV sensing bulb is on a horizontal
section of the suction line tube and positioned between 10
o’clock and 2 o’clock on the tube. (See Figures 20 and 21) .
NOTE: The sensing bulb must be able to sense the temperature of
the superheated suction vapor and must therefore not be located
in a position that will expose it to extraneous heat/cold. The
sensing bulb must be insulated to isolate it from the surrounding
air. The TXV must be the proper size and type for the applications
to achieve the performance ratings of the system.
NOTE: If a non-bleed type TXV is used, the outdoor unit may
require a hard start kit to allow the compressor to start under
load.
How the TXV Controls Superheat
The TXV is a precision device designed to regulate the rate at
which liquid refrigerant flows into the evaporator. This controlled
flow is necessary to provide optimum performance and to
prevent the return of liquid refrigerant to the compressor.
The TXV separates the high pressure and low-pressure sides of a
Figure 18: TXV Bulb Placement
refrigeration or air conditioning system. Liquid refrigerant enters
the TXV under high pressure, but the pressure is reduced when
the flow of the refrigerant is restricted by an internal moving pin
and port.
It is important to remember that the TXV only controls the level
of superheat of the refrigerant in the suction line. The TXV is not
designed to control air temperature, head pressure, capacity,
suction pressure, or humidity. Attempts to adjust the TXV to
control any of these system variables will lead to poor system
performance and possible compressor failure.
The TXV responds to the temperature of refrigerant gas as it
leaves the evaporator. This temperature is detected by the sensing
bulb which is located near the evaporator outlet. The TXV also
responds to the refrigerant pressure within the evaporator, which
is transmitted to the TXV by an equalizer tube connected to the
coil suction manifold. By responding to these variables, the TXV
maintains a predetermined superheat level exiting the evaporator
which maintains proper system stability, performance, and
reliability.
TXV TROUBLESHOOTING
The thermostatic expansion valve (TXV) is like the carburetor in
a car engine. It opens and closes to allow the correct amount of
refrigerant flow through the system. When the TXV isn’t working
properly, the capacity and efficiency of the system is reduced. If a
faulty TXV is suspected, perform the following tests:
Connect refrigerant gauges to the system and check that the
refrigerant pressures, liquid subcooling and suction superheat
levels are correct according to the outdoor unit charging chart.
Subcooling at the outdoor unit liquid service valve is normally
around 10°F and superheat at the outdoor unit suction service
valve is normally between 8-12°F, but these can vary depending
on the manufacturer and model of the outdoor unit.
Check to see if the indoor airflow through the system is correct.
Check to see if the indoor and outdoor coils and indoor air filters
are dirty. Clean dirty coils and clean/replace dirty air-filters as
necessary before measuring air-flow and checking pressures,
superheat, and subcooling.
Make sure the refrigerant charge in the system is correct. This
step may require weighing the refrigerant in the system. Once
refrigerant charge weight has been adjusted as necessary, recheck
the pressures, subcooling and superheat. If these values are still
not correct, the TXV may be defective or the TXV inlet strainer or
the liquid line filter dryer is plugged with debris.
A good way to determine if the TXV is defective is to remove the
TXV’s sensing bulb from the suction line and check the pressures,
subcooling, superheat again. No change in the pressures,
subcooling, and superheat levels is an indication the TXV is
defective. Another test that can be performed is to place the
sensing bulb in ice water and recheck the pressures, superheat,
and subcooling levels. If these values don’t change, the TXV is
likely defective.
Additional TXV Troubleshooting Information
Low Suction Pressure – High Superheat
POSSIBLE CAUSES:
1. Undersized TXV
2. TXV superheat adjustment too high
3. High indoor coil pressure drop due to internal restriction

Coil is pressurized with nitrogen. Relieve pressure before
installing TXV by depressing Schrader valve on coil suction
manifold.
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 13
Field Installed TXV Installation Procedure
1. Remove the cap on Schrader valve port on coil suction
manifold.
2. Depress the Schrader valve to relieve the pressure inside
the coil.
3. Only after coil pressure has been relieved, turn the female
swivel nut counter-clockwise to separate it from the
distributor.
4. Remove the piston orifice from the flowrator distributor
assembly using a small diameter wire or paper clip.
5. As shown in Figure 10, the TXV assembly must be installed
between the distributor and the liquid line connector.
6. Attach the TXV by connecting the female swivel nut on TXV
outlet to the flowrator distributor (aligning Teflon seal first)
and torque swivel nut to 10-30 ft. lbs.
7. Attach the liquid line connector with female swivel nut to
male rotalock fitting on TXV inlet (aligning Teflon seal first)
and torque swivel nut to 10-30 ft. lbs.
8. Attach equalizer tubing with 1/4”female flare nut that includes
depressor to the male Schrader port on the coil suction
manifold and torque nut to 10-30 ft. lbs.
Figure 19: TXV Sensing Bulb Location
4. TXV sensing bulb installed on bottom of suction line
5. Restricted or capped TXV external equalizer tube
6. Improper TXV external equalizer location (must be located on
suction manifold after the last feeder tube)
7. Low refrigerant charge
8. Plugged liquid line filter dryer
9. Plugged TXV inlet strainer
10. Low outdoor ambient temperature
High Suction Pressure – Low Superheat
POSSIBLE CAUSES:
1. Oversized TXV
2. TXV seat leakage
3. TXV superheat adjustment too low
4. Improper TXV sensing bulb installation
a. Poor thermal contact with suction line (loose clamp)
b. Uninsulated sensing bulb
c. Warm location
5. Bad compressor (low capacity)
6. Incorrectly located external equalizer line (must be located on
suction manifold after the last feeder tube)
Low Suction Pressure – Low Superheat
POSSIBLE CAUSES:
1. Low system load:
a. Insufficient indoor airflow
b. Dirty indoor air filters
c. Return air too cold
d. Indoor coil icing or frosting
2. Poor air distribution over indoor coil
3. Improper indoor/outdoor coil internal volume balance on
heat pump systems (improper air handler/outdoor unit match
up; indoor coil too big or too small causing incorrect
refrigerant charge balance between cooling and heating
modes)
4. Oil trapped in indoor coil
Things to Check Before Replacing TXV
1. Slowly loosen the flare nut on the TXV external equalizer
connected to the suction line port with a flare nut. If there is a
large pressure release when the nut has been loosened, tighten
the nut. If this results in a slight pressure release or no pressure
release; the Schrader valve stem is not being depressed. Install
an anti-blow back fitting to the external equalizer line of the
TXV to depress the Schrader valve stem and check for proper
operation of the TXV.
2. Remove the sensing bulb from the suction line and hold in a
warm hand. The high side pressure should drop and low side
pressure should increase as the TXV opens. Place the sensing
bulb in ice water. The high side pressure should increase and
the low side pressure should decrease as the TXV closes. If the
pressures do not change, the TXV is faulty.
FLOWRATOR TO TXV CONVERSION:
While thermal expansion valves can be factory installed, they are
normally available in kit form for field installation. For kit version,
follow the installation instructions provided with the kit. Normally
these can be field installed before system is charges without
requiring cutting and brazing. BE SURE FLOWRATER PISTON
HAS BEEN REMOVED FROM THE FLOWRATER DISTRIBUTOR
BODY PRIOR TO INSTALLATION OF EXPANSION VALVE.
FIELD INSTALLED TXV KIT INFORMATION
R72DB0053HX: R-410A, 1.5 – 2.5 Ton, 15% Bleed,
Inlet: Male Rotolock. Outlet: Female Swivel Nut
R72DB0054HX: R-410A, 3.0 – 5.0 Ton, 15% Bleed,
Inlet: Male Rotolock, Outlet: Female Swivel Nut

HEX NUT
LIQUID LINE
PISTON
TEFLON SEAL
FOR PISTON
FLOWRATOR
DISTRIBUTOR
BODY
FEED TUBES
TO COIL
TEFLON SEAL
FOR BODY
PISTON
RETAINER
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 14
Figure 20: Typical TXV Connections
Figure 21: TXV Installed In Air Handler Figure 22: Flowrator Distributor
SPECIAL INSTRUCTIONS FOR COILS WITH
FLOWRATOR DISTRIBUTOR ASSEMBLIES
The sizing of the orifice piston should be based on the rated
capacity of the outdoor unit and air handler match-up.
Summit provides capacity performance ratings that match both
same size and upsized air handlers with specific manufacturer’s
outdoor units. Consult the local Summit distributor for the proper
size orifice piston to be used for a specific outdoor unit model
number. The factory installed orifice piston size is marked on the
flowrator distributor assembly and the air handler carton.
Failure to install the proper size orifice piston can lead to poor
system performance and possible compressor damage. A
variation of one piston size smaller or larger is not normally
critical. Mortex/Summit reserves the right to substitute a factory
installed piston one size smaller or greater if the piston size
ordered is out of stock. A selection of replacement orifice pistons
is available from the local Summit distributor.
ORIFICE PISTON REPLACEMENT
If the flowrator is being used instead of a TXV, the piston must be
installed oriented as shown in Figure 24 in the distributor body
and the existing liquid line attached to the flowrator distributor.
1. Remove the cap on Schrader valve port on coil manifold.
2. Depress the Schrader valve to relieve the pressure inside the
coil.
3. Only after coil pressure has been relieved, turn the female
swivel nut counter-clockwise to separate it from the distributor.
4. Replace the orifice piston with the correct size piston for the
application. Make sure the tapered end of the piston is facing
the feeder tubes on the distributor body.
5. Turn the female swivel nut on clockwise the flowrator
distributor (aligning Teflon seal first) and torque swivel nut to
10-30 ft. lbs.
6. After completing the installation of the correct size orifice
piston, leak check the flowrator distributor fitting and
thoroughly evacuate the system through the service fittings on
the outdoor unit liquid and suction service valves.
9. Install the TXV bulb to the suction line using the two bulb
clamps furnished with kit.
a. The sensing bulb should be installed on a horizontal run of
the suction line if possible and should be positioned
between 10 o’clock and 2 o’clock as shown in Figure 8.
b. If the sensing bulb is installed on a vertical run of the suction
line, the bulb should be located at least 6 inches away from
any bend and on the side of the tube that is above the
inside of the bend. On vertical run bulb installations, the
bulb should be positioned with the bulb capillary tube at
the top.
c . The bulb should be insulated using thermal insulation
to protect it from the effect of the surrounding ambient
temperature.
10. After completing the TXV installation, leak check all TXV
fittings and thoroughly evacuate the coil through the service
access fittings on the outdoor unit liquid and suction service
valves prior to charging the system with refrigerant.

This air handler must not be located where water can cause
damage to the adjacent area if the condensate drain pan
should overflow or if any condensate drain connections
should leak.
When such locations can’t be avoided, a suitable auxiliary
drain pan must be installed under the air handler and
connected to an adequate drain. The auxiliary drain pan
should be at least 2” greater in length and width than the
air handler dimensions and should be at least 1.5” deep.
The manufacturer of this air handler is not liable for any
water damage related to the air handler.
Toxic chemicals used for treatment of boilers or non-
potable water heating appliances must never be
introduced into a potable water space heating system.
When system requires water at temperatures higher than
required for other uses, a means such as a mixing valve
shall be installed to temper the water for those uses in
order to reduce the potential for a scald hazard.
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 15
Figure 23: Typical Condensate Trap
SECTION 5: HYDRONIC (HOT WATER) HEAT
“Massachusetts requires an electronically controlled
pump timer that activates the pump every 6 hours
for 60 seconds and limits the distance between the
water heater and the air handler to 50 feet max.”
CONDENSATE DRAIN PIPING:
The air handler coil drain pan has one ¾”NPT female connection
and one ¾”NPT female secondary connection located in the
return air compartment. Piping from each fitting used is to have
2”minimum trap (See Figure 25) and each run in such a manner
as to provide enough slope for adequate drainage to a visible
area. Do not pipe these two fittings together into a common
drain. If a secondary drain is not installed, the secondary drain
connection must be capped.
CHILLED AND HOT WATER PIPING
All water pipes must be supported independent of coils to
prevent vibration and stress on coil headers. Swing joints or
flexible fittings must be provided to absorb expansion and
contraction strains. Rigid piping reduces the effectiveness of
vibration isolators. Coil water pipes must be adequately vented
in order to prevent air binding. Air handlers are provided with
manual air vents mounted through the manifold panel.
Chilled Water Piping
Supply and return chilled water piping to the coil should be ¾”ID
up to 42,000 BTU/Hr, 1” on air handlers greater than 42,000 BTU/
Hr. Water piping must always be connected so that the entering
water is on the leaving air side of the coil.
Hot Water Piping
If a residential water heater is used for space heating water, do
not exceed a distance of 70 feet between the air handler and the
water heater. The water heater should be the quick recovery type.
Air handler and water heater must be located indoors and not
subject to freezing temperatures.
Total hot water piping should not exceed 140 feet. All hot water
piping to the coil should be copper and ¾”ID and 7/8” OD. CPVC
or PEX piping may be used in applications where the water
temperature does not exceed 150°F. It is recommended that a
water isolation valve and a union be placed in the water lines to
and from the coil that is near the coil for serviceability, repair or
replacement of the coil.
A thermal expansion tank is recommended on any closed loop
system to relieve thermal expansion due to pressure increase.
NOTE: Refer to Filling Hydronic Heating System With Water,
Purging Air From System, and System Startup in
SECTION 9: FINAL SYSTEM CHECK-OUT AND START-UP for
instructions on filling the system with water, purging the air
from the system, and checking for leaks once the air handler
installation has been completed.

Performance Data - Hot Water Slab Coils
HEATING PERFORMANCE DATA:
HOT WATER
WALL MOUNT
MODEL NO.
HOT WATER CAPACITIES @
70°F ENTERING AIR TEMPERATURE
ENTERING WATER TEMPERATURE
PRESS.
DROP
WATER
PRESS.
DROP
AIR
AHW 2-18/24-2N
LI
1/2HP, 10x8T,
20”FH x 10” FL,
2 Row,
4 Circuit, 10 FPI
100°F 110°F 120°F 130°F 140°F 150°F 160°F 170°F 180°F CFM GPM (FT-WTR) (IN-WC)
9,071 12,188 15,342 18,528 21,741 24,979 28,238 31,516 34,809
840
2.0 0.68
0.208
10,069 13,590 16,983 20,486 24,014 27,564 31,132 34,717 38,317 3.0* 1.39
10,660 14,291 17,951 21,637 25,344 29,071 32,815 36,573 40,344 4.0 2.32
11,055 14,811 18,593 22,397 26,221 30,063 33,920 37,790 41,671 5.0 3.45
11,338 15,183 19,051 22,940 26,846 30,768 34,704 38,652 42,610 6.0 4.76
8,826 11,857 14,923 18,018 21,141 24,286 27,451 30,634 33,831
785
2.0 0.68
0.185
9,763 13,097 16,462 19,854 23,270 26,706 30,160 33,630 37,112 3.0* 1.39
10,315 13,827 17,365 20,926 24,509 28,110 31,726 35,356 38,998 4.0 2.32
10,682 14,310 17,961 21,633 25,324 29,031 32,752 36,485 40,229 5.0 3.45
10,945 14,654 18,386 22,136 25,903 29,684 33,478 37,283 41,098 6.0 4.76
8,309 11,158 14,037 16,943 19,873 22,822 25,790 28,773 31,769
680
2.0 0.68
0.146
9,124 12,234 15,373 18,534 21,716 24,915 28,130 31,358 34,599 3.0* 1.39
9,598 12,861 16,146 19,452 22,776 26,116 29,468 32,833 36,208 4.0 2.32
9,911 13,272 16,654 20,054 23,469 26,898 30,339 33,791 37,252 5.0 3.45
10,135 13,565 17,014 20,480 23,959 27,451 30,953 34,465 37,985 6.0 4.76
7,801 10,471 13,168 15,888 18,630 21,389 24,163 26,950 29,750
590
2.0 0.68
0.116
8,505 11,400 14,319 17,258 20,215 23,187 26,173 29,170 32,176 3.0* 1.39
8,910 11,935 14,979 18,041 21,118 24,208 27,310 30,422 33,542 4.0 2.32
9,176 12,283 15,409 18,550 21,704 24,869 28,045 31,230 34,422 5.0 3.45
9,365 12,503 15,713 18,909 22,113 25,334 28,562 31,797 35,039 6.0 4.76
6,850 9,186 11,544 13,919 16,310 17,715 21,131 23,558 25,994
450
2.0 0.68
0.074
7,370 9,873 12,392 14,927 17,474 20,033 22,602 25,179 27,763 3.0* 1.39
7,664 10,259 12,869 15,497 18,124 20,767 23,418 26,076 28,741 4.0 2.32
7,855 10,508 13,176 15,854 18,541 21,237 23,940 26,649 29,364 5.0 3.45
7,989 10,684 13,390 16,107 18,833 21,565 24,304 27,048 29,798 6.0 4.76
AHW 2-18/24-3N
LI
1/2HP, 10x8T,
20”FH x 10” FL,
3 Row,
5 Circuit, 10 FPI
11,453 15,387 19,368 23,388 27,433 31,528 35,639 39,773 43,925
840
2.0 0.55
0.311
12,860 17,256 21,693 26,168 30,675 35,209 39,767 44,347 48,944 3.0* 1.14
13,693 18,356 23,057 27,791 32,554 37,341 42,151 46,979 51,823 4.0 1.89
14,244 19,083 23,955 28,857 33,785 38,736 43,705 48,692 53,694 5.0 2.81
14,637 19,600 24,593 29,612 34,656 39,720 44,801 49,898 55,009 6.0 3.89
11,139 14,963 18,830 22,735 26,674 30,640 34,631 38,643 42,674
785
2.0 0.55
0.278
12,452 16,704 20,996 25,322 29,679 34,061 38,465 42,890 47,331 3.0* 1.14
13,222 17,721 22,255 26,821 31,413 36,028 40,663 45,315 49,983 4.0 1.89
13,729 18,389 23,081 27,800 32,543 37,307 42,089 46,886 51,698 5.0 2.81
14,090 18,865 23,666 28,493 33,341 38,209 43,092 47,990 52,900 6.0 3.89
10,469 14,058 17,684 21,343 25,032 28,747 32,482 36,237 40,008
680
2.0 0.55
0.219
11,592 15,543 19,530 23,546 27,587 31,651 35,735 39,834 43,949 3.0* 1.14
12,240 16,398 20,586 24,801 29,038 33,295 37,568 41,857 46,159 4.0 1.89
12,662 16,954 21,273 25,614 29,976 34,354 38,749 43,156 47,575 5.0 2.81
12,961 17,347 21,756 26,185 30,633 35,096 39,573 44,062 48,562 6.0 3.89
9,804 13,159 16,547 19,964 23,407 26,872 30,355 33,855 37,369
590
2.0 0.55
0.173
10,755 14,416 18,106 21,821 25,558 29,314 33,087 36,874 40,673 3.0* 1.14
11,295 15,127 18,984 22,863 26,762 30,676 34,605 38,546 42,498 4.0 1.89
11,644 15,587 19,550 23,533 27,532 31,546 35,573 39,611 43,658 5.0 2.81
11,890 15,908 19,946 24,000 28,070 32,152 36,246 40,350 44,462 6.0 3.89
8,544 11,457 14,396 17,356 20,335 23,331 26,341 29,364 32,397
450
2.0 0.55
0.111
9,215 12,342 15,489 18,654 21,836 25,031 28,237 31,455 34,680 3.0* 1.14
9,585 12,828 16,088 19,364 22,653 25,953 29,263 32,582 35,909 4.0 1.89
9,821 13,137 16,468 19,812 23,168 26,533 29,907 33,289 36,678 5.0 2.81
9,985 13,351 16,731 20,122 23,523 26,934 30,351 33,776 37,206 6.0 3.89
Note:“3*” = Optional factory installed hot water circulating pump ow rate.
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 16
Table 5: AHW2-18, 24-2N and AHW2-18, 24-3N Hot Water Heating Capacities

Performance Data - Hot Water Slab Coils
HEATING PERFORMANCE DATA:
HOT WATER
WALL MOUNT
MODEL NO.
HOT WATER CAPACITIES @
70°F ENTERING AIR TEMPERATURE
ENTERING WATER TEMPERATURE
PRESS.
DROP
WATER
PRESS.
DROP
AIR
AHW2-18/24-4N
LI
1/2HP, 10x8T,
20”FH x 10”FL,
4 Row,
5 Circuit, 10 FPI
100°F 110°F 120°F 130°F 140°F 150°F 160°F 170°F 180°F CFM GPM (FT-WTR) (IN-WC)
13,458 18,060 22,709 27,397 32,117 36,867 41,641 46,434 51,246
840
2.0 0.75
0.415
15,168 20,334 25,543 30,788 36,064 41,368 46,694 52,042 57,405 3.0* 1.54
16,158 21,644 27,168 32,725 38,310 43,920 49,550 55,199 60,862 4.0 2.56
16,803 22,494 28,220 33,975 39,756 45,559 51,380 57,218 63,070 5.0 3.80
17,256 23,091 28,957 34,850 40,765 46,700 52,653 58,620 64,601 6.0 5.24
13,073 17,542 22,053 26,602 31,182 35,789 40,420 45,069 49,735
785
2.0 0.75
0.371
14,655 19,642 24,669 29,730 34,821 39,937 45,074 50,229 55,399 3.0* 1.54
15,561 20,840 26,155 31,500 36,871 42,265 47,678 53,106 58,550 4.0 2.56
16,148 21,614 27,111 32,635 38,184 43,751 49,337 54,937 60,550 5.0 3.80
16,559 22,155 27,779 33,427 39,096 44,784 50,487 56,204 61,932 6.0 5.24
12,248 16,429 20,646 24,897 29,175 33,478 37,801 42,140 46,495
680
2.0 0.75
0.292
13,574 18,185 22,832 27,506 32,206 36,927 41,667 46,422 51,190 3.0* 1.54
14,318 19,168 24,048 28,952 33,879 38,825 43,786 48,761 53,749 4.0 2.56
14,794 19,795 24,821 29,870 34,938 40,023 45,122 50,233 55,356 5.0 3.80
15,125 20,230 25,357 30,505 35,669 40,849 46,042 51,245 56,458 6.0 5.24
11,424 15,317 19,242 23,197 27,175 31,174 35,191 39,222 43,267
590
2.0 0.75
0.231
12,522 16,769 21,045 25,346 29,667 34,006 38,361 42,728 47,108 3.0* 1.54
13,126 17,565 22,029 26,514 31,017 35,535 40,067 44,610 49,163 4.0 2.56
13,508 18,068 22,649 27,247 31,862 36,490 41,130 45,781 50,439 5.0 3.80
13,771 18,414 23,075 27,751 32,442 37,144 41,858 46,580 51,310 6.0 5.24
9,855 13,203 16,574 19,966 23,376 26,801 30,239 33,689 37,147
450
2.0 0.75
0.147
10,590 14,171 17,117 21,389 25,021 28,665 32,320 35,984 39,655 3.0* 1.54
10,980 14,683 18,403 22,136 25,882 29,638 33,402 37,175 40,954 4.0 2.56
11,221 15,001 18,793 22,597 26,411 30,235 34,066 37,903 41,747 5.0 3.80
11,386 15,216 19,058 22,909 26,770 30,639 34,514 38,395 42,281 6.0 5.24
AHW2-30/36-2N
LL
1/2HP, 12x8T,
20”FH x 10”FL,
2 Row,
4 Circuit, 10 FPI
10,072 13,544 17,061 20,617 24,209 27,830 31,477 35,146 38,836
1,110
2.0 0.68
0.329
11,344 15,233 19,164 23,132 27,132 31,160 35,212 39,284 43,376 3.0* 1.39
12,119 16,257 20,433 24,643 28,882 33,146 37,433 41,738 46,060 4.0 2.32
12,641 16,947 21,287 25,657 30,053 34,472 38,912 43,369 47,841 5.0 3.45
13,020 17,446 21,903 26,387 30,895 35,424 39,971 44,535 49,112 6.0 4.76
9,805 13,181 16,601 20,258 23,548 27,067 30,609 34,173 37,757
1,030
2.0 0.68
0.291
11,000 14,767 18,575 22,416 26,288 30,186 34,106 38,047 42,004 3.0* 1.39
11,722 15,722 19,758 23,824 27,918 32,036 36,173 40,329 44,501 4.0 2.32
12,207 16,364 20,550 24,765 29,005 33,266 37,545 41,841 46,150 5.0 3.45
12,559 16,825 21,121 25,441 29,783 34,146 38,525 42,919 47,326 6.0 4.76
9,514 12,788 16,102 19,452 22,833 26,240 29,670 33,121 36,588
950
2.0 0.68
0.255
10,629 14,266 17,940 21,646 25,381 29,140 32,900 36,718 40,532 3.0* 1.39
11,297 15,150 19,034 22,948 26,887 30,848 34,828 38,824 42,835 4.0 2.32
11,745 15,741 19,765 23,815 27,887 31,979 36,089 40,214 44,351 5.0 3.45
12,068 16,165 20,289 24,435 28,602 32,787 36,987 41,202 45,428 6.0 4.76
9,218 12,387 15,594 18,834 22,103 25,397 28,713 32,048 35,399
875
2.0 0.68
0.222
10,254 13,759 17,299 20,869 24,466 28,084 31,722 35,378 39,049 3.0* 1.39
10,870 14,574 18,308 22,069 25,852 29,656 33,478 37,314 41,165 4.0 2.32
11,282 15,117 18,978 22,863 26,769 30,693 34,633 38,586 42,552 5.0 3.45
11,578 15,505 19,458 23,431 27,423 31,431 35,454 39,489 43,536 6.0 4.76
8,872 11,919 15,001 18,114 21,253 24,416 27,598 30,799 34,014
795
2.0 0.68
0.189
9,820 13,174 16,559 19,972 23,408 26,866 30,341 33,832 37,336 3.0* 1.39
10,379 13,913 17,474 21,058 24,664 28,288 31,929 35,582 39,248 4.0 2.32
10,751 14,403 18,078 21,775 25,491 29,223 32,969 36,727 40,497 5.0 3.45
11,018 14,752 18,510 22,285 26,078 29,885 33,706 37,537 41,379 6.0 4.76
Note:“3*” = Optional factory installed hot water circulating pump ow rate.
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 17
Table 6: AHW2-18, 24-4N and AHW2-30, 36-2N Hot Water Heating Capacities

Performance Data - Hot Water Slab Coils
HEATING PERFORMANCE DATA:
HOT WATER
WALL MOUNT
MODEL NO.
HOT WATER CAPACITIES @
70°F ENTERING AIR TEMPERATURE
ENTERING WATER TEMPERATURE
CFM GPM
PRESS.
DROP
WATER
(FT-WTR)
PRESS.
DROP
AIR
(IN-WC)
AHW 2-30/36-3N
LL
1/2HP, 12x8T,
20”FH x 10”FL,
3 Row,
5 Circuit, 10 FPI
100°F 110°F 120°F 130°F 140°F 150°F 160°F 170°F 180°F
12,718 17,099 21,537 26,024 30,552 35,118 39,714 44,339 48,986
1,110
2.0 0.55
0.494
14,552 19,541 24,585 29,675 34,808 39,975 45,174 50,398 55,647 3.0* 1.14
15,672 21,026 26,429 31,876 37,362 42,880 48,428 53,999 59,592 4.0 1.89
16,429 22,025 27,668 33,351 39,068 44,816 50,590 56,388 62,204 5.0 2.81
16,977 22,747 28,560 34,409 40,291 46,201 52,136 58,090 64,064 6.0 3.89
12,383 16,647 20,963 25,326 29,729 34,167 38,635 43,129 47,646
1,030
2.0 0.55
0.437
14,097 18,927 23,807 28,732 33,696 38,693 43,719 48,770 53,843 3.0* 1.14
15,136 20,301 25,514 30,768 36,057 41,377 46,723 52,093 57,482 4.0 1.89
15,834 21,223 26,655 32,124 37,626 43,156 48,710 54,285 59,878 5.0 2.81
16,336 21,886 27,473 33,095 38,747 44,424 50,123 55,843 61,578 6.0 3.89
12,017 16,151 20,335 24,563 28,829 33,128 37,456 41,808 46,181
950
2.0 0.55
0.382
13,607 18,263 22,968 27,714 32,495 37,309 42,148 47,012 51,894 3.0* 1.14
14,560 19,525 24,533 29,579 34,657 39,764 44,896 50,048 55,219 4.0 1.89
15,198 20,365 25,573 30,815 36,086 41,383 46,702 52,041 57,397 5.0 2.81
15,654 20,967 26,316 31,696 37,103 42,533 47,984 53,452 58,936 6.0 3.89
11,641 15,642 19,690 23,779 27,905 32,061 36,244 40,450 44,677
875
2.0 0.55
0.333
13,108 17,589 22,116 26,680 31,278 35,904 40,555 45,229 49,920 3.0* 1.14
13,979 18,741 23,544 28,381 33,248 38,140 43,056 47,991 52,943 4.0 1.89
14,558 19,505 24,487 29,501 34,542 39,607 44,691 49,794 54,911 5.0 2.81
14,971 20,050 25,159 30,297 35,459 40,644 45,846 51,065 56,298 6.0 3.89
11,198 15,043 18,931 22,858 26,817 30,807 34,820 38,855 42,909
795
2.0 0.55
0.284
12,528 16,807 21,126 25,480 29,864 34,275 38,709 43,162 47,631 3.0* 1.14
13,310 17,839 22,404 27,001 31,625 36,272 40,940 45,624 50,325 4.0 1.89
13,825 18,518 23,244 27,997 32,774 37,573 42,389 47,222 52,068 5.0 2.81
14,191 19,001 23,838 28,701 33,586 38,489 43,410 48,344 53,291 6.0 3.89
AHW 2-30/36-4N
LL
1/2HP, 12x8T,
20”FH x 10”FL,
4 Row,
5 Circuit, 10 FPI
14,991 20,131 23,187 29,145 35,151 41,198 47,280 53,393 59,530
1,110
2.0 0.75
0.659
17,283 23,187 29,145 35,151 41,198 47,280 53,393 59,530 65,688 3.0* 1.54
18,644 25,018 31,425 37,877 44,366 50,888 57,439 64,013 70,608 4.0 2.56
19,586 26,238 32,938 39,679 46,455 53,262 60,095 66,950 73,825 5.0 3.80
20,245 27,108 34,015 40,960 47,937 54,942 61,972 69,022 76,090 6.0 5.24
14,588 19,588 24,639 29,736 34,870 40,039 45,235 50,455 55,693
1,030
2.0 0.75
0.582
16,717 22,423 28,181 33,983 39,823 45,696 51,598 57,522 63,468 3.0* 1.54
17,986 24,105 30,272 36,481 42,725 48,999 55,299 61,622 67,965 4.0 2.56
18,827 25,217 31,651 38,122 44,626 51,158 57,714 64,291 70,885 5.0 3.80
19,426 26,007 32,628 39,283 45,969 52,680 59,413 66,165 72,933 6.0 5.24
14,145 18,989 23,883 28,818 33,792 38,796 43,826 48,880 53,950
950
2.0 0.75
0.509
16,103 21,595 27,135 32,716 38,333 43,979 49,652 55,348 61,062 3.0* 1.54
17,257 23,123 29,033 34,981 40,962 46,971 53,003 59,056 65,127 4.0 2.56
18,016 24,126 30,275 36,459 42,673 48,912 55,173 61,452 67,748 5.0 3.80
18,554 24,835 31,152 37,500 43,875 50,274 56,693 63,129 69,579 6.0 5.24
13,688 18,371 23,101 27,871 32,676 37,511 42,371 47,251 52,149
875
2.0 0.75
0.444
15,479 20,753 26,071 31,427 36,816 42,234 47,675 53,137 58,615 3.0* 1.54
16,521 22,132 27,783 33,469 39,185 44,926 50,689 56,471 62,268 4.0 2.56
17,202 23,031 28,896 34,792 40,715 46,661 52,627 58,610 64,607 5.0 3.80
17,683 23,664 29,678 35,719 41,786 47,873 53,979 60,100 66,234 6.0 5.24
13,145 17,640 22,176 26,751 31,357 35,991 40,649 45,325 50,018
795
2.0 0.75
0.379
14,751 19,771 24,833 29,928 35,053 40,204 45,376 50,567 55,774 3.0* 1.54
15,672 20,990 26,343 31,728 37,139 42,572 48,026 53,496 58,980 4.0 2.56
16,270 21,778 27,317 32,884 38,475 44,087 49,716 55,361 61,018 5.0 3.80
16,689 22,329 27,997 33,691 39,406 45,140 50,889 56,652 62,427 6.0 5.24
Note:“3*” = Optional factory installed hot water circulating pump ow rate.
Table 7: AHW2-30, 36-3N and AHW2-30, 36-4N Hot Water Heating Capacities
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 18

This air handler is not equipped with a shield that covers
the line voltage electrical supply wires the terminal
block connections or the circuit breaker connections. For
personal safety, turn the electrical power“OFF” at the main
electrical panel (breaker box) and at the air handler control
box the pull-out disconnect device before attempting any
service or maintenance operations. Homeowners should
never attempt to perform any maintenance which requires
opening the air handler control box cover.
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 19
Figure 24: Typical Hot Water Tank and Refrigerant
Line Connections Figure 25: Typical Hot Water Tank Connections
Figure 26: Line Voltage Wire Knockout and
Thermostat Wire Entrance Locations - AHW1
SECTION 6: LINE VOLTAGE WIRING
Power Supply Wiring
The air handler internal wiring is complete except for the power
supply and the thermostat wires. See wiring diagram and/or
Tables 8, 9, and 11 for wire size, fuse/circuit breaker size, and
ground wire sizes. The use of a cable connector (strain relief) on
incoming power supply wires to relieve any strain on wiring is
required. Follow the steps below to connect the power supply
wires.
1. Remove the blower/control box access panel.
2. Remove the appropriate size knockout in the electrical
entrance located on the left side of the air handler top.
3. Install a cable connector (strain relief) in the electrical entrance
hole.
4. Strip ½”of the insulation from the end of each wire.
5. Insert the supply voltage wires through the cable connector.
6. Insert the black wire into the L1 screw terminal on the circuit
breaker, pull-out disconnect, or terminal block from the top and
tighten the set screw to clamp down on the wire. For models
with line voltage pigtails, connect the black wire to the black
pigtail wire and tighten the wire nut.
7. Insert the white or red wire into the L2 screw terminal on the
circuit breaker, pull-out disconnect, or terminal block
8. from the top and tighten the set screw to clamp down on the
wire. For models with line voltage pigtails, connect the white or
red wire to the red pigtail wire and tighten the wire nut.
9. Insert the green wire into the ground lug and tighten the set
screw.
NOTE: This air handler may be equipped with a pull-out
disconnect device. The pull-out disconnect device provides a
means of disconnecting the power to the air handler. The pull-
out disconnect device is not meant to protect the wiring in the
air handler and between the air handler and the main electrical
panel (breaker box). To protect the electrical supply wiring and
the wiring inside of the air handler in the event of a short circuit,
a circuit breaker in the main electric panel (breaker box) is
required. Electrical data for the air handler is shown in Tables 8-11.
If sheathed cable is used, refer to NEC National Electrical Code
(NFPA 70) or the Canadian Electrical Code,
Part I (CSA C22.1) and local codes for additional requirements
concerning supply circuit wiring.
IMPORTANT - All installation on field wiring must be rated at 60ºC
or higher. Please refer to the wiring diagrams on the air handler or
the tables this manual for more information.

Indoor Blower Type
AIR HANDLER MODELS
AHW1 AHW1 AHW1
Constant Torque AHW1 Constant Torque AHW1 Constant Torque
Indoor Blower Motor Code LM LG LI
Indoor Blower HP 1/3 1/3 1/2
Indoor Blower Size 10 x 7T 10 x 7T 10 x 8T
Indoor Blower Amps - 208/240 VAC 0.77 / 0.74 1.66 / 1.58 2.52 / 2.40
Min. Wire Size (90°C) #14 #14 #14
Minimum Wire Size (75°C) #14 #14 #14
Minimum Wire Size (60°C) #14 #14 #14
Ground Wire Size #14 #14 #14
Max Fuse Amps 15 15 15
MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 20
Figure 27: Line Voltage Wire Knockout and Thermo-
stat Wire Entrance Locations - AHW2
Figure 28: Pull-Out Disconnect Location - AHW1
Table 8: Wiring Requirements – 208/240 VAC No Electric Heat
+ 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 8.