Suntherm SEHX User manual

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INSTALLATION MANUAL
Horizontal Air Handler Models:
SEHX - DX Cooling w/ Electric Heat, Uncased SDXW - DX Cooling w/ Hot Water Heat, Uncased
CEHX – DX Cooling w/ Electric Heat, Cased CDXW – DX Cooling w/ Hot Water Heat, Cased
SCWE – Chilled Water Cooling w/Electric Heat, Uncased-2P SCWW – Chilled Water Cooling w/Hot Water Heat, Uncased-4P
CCWE – Chilled Water Cooling w/Electric Heat, Cased-2P CCWW – Chilled Water Cooling w/Hot Water Heat, Cased-4P
LIST OF SECTIONS
1 – General 1 7 – Hot Water and Chilled Water Tables 15
2 – Safety, Mounting, General, Dimensional & Nomenclature Info 2 8 – Line Voltage Wiring 24
3 – Clearance and Return Air Requirements 7 9 – Thermostat Wiring and Connections 27
4 – Air Handler and Supply Air Duct Installation 9 10 – Motor, Blower and Furnace Startup 32
5 – Air Handler Installation 10 11 – Final System Checkout 34
6 – Refrigerant Piping, TXV, Flowrator & Condensate Drain Info 10 12 – Wiring Diagrams 35
LIST OF FIGURES
1 – Cased Enclosure Mounting 3 21 – Separate TStat, Separate Air Handler and Cooling Units 28
2 – CEHX/CCWE Dimension Data DX Cool w/ or w/o Elect Heat 5 22 – Separate TStat & Trans.; Separate Air Handler and Cooling 28
3 – SEHX/SCWE Dimension Data Chill Water w/ or w/o Elect Heat 6 23 – Same TStat, Separate Trans, Separate Air Handler & Cool Units 28
4 – Clearance – Access for Service 8 24 – Same TStat, Same Trans, Separate Air Handler & Cooling Units 29
5 – Ceiling Access Panel 9 25 – Honeywell T9611Heat Pump Thermostat Connections 29
6 – Evaporator Below Condenser Piping 10 26 – White Rodgers Multistage Heat / Cool T’stat Connections 30
7 – The TXV Bulb Best Placement 11 27 – White Rodgers Multistage Heat / Cool / HP T’stat Connections 30
8 – TXV Sensing Bulb Location 12 28 – White Rodgers Heat / Cool Two Trans T’stat Connections 30
9 – Typical TXV Connections 13 29 – Blower Assembly 32
10 – Flowrator Distributor Assembly 13 30 – Blower Motor Retainer Clips 32
11 – Proper Mounting of the SHL Temperature Switch 14 31 – PSC Blower Assembly 32
12 – Proper Wiring of the SHL Temperature Switch 14 32 – Constant Torque Blower Assembly 33
13 – Diagram of the Heating Cycle of a Heat Pump SHL Switch Loc 14 33 – Constant Torque Motor Terminals 34
14 – Diagram of the Cooling Cycle of a Heat Pump SHL Switch Loc 14 34 – Wire Diagram 3kW-10kW Electric HT- PSC Motor 35
15 – Condensate Drain Pan 15 35 – Wire Diagram 3kW-10kW Electric HT- PSC Motor w/ Lockout 35
16 – Typical Condensate Trap 15 36 – Wire Diagram Hydronic Heat – PSC Motor – w/FS - No Pump 36
17 – Components and Water Connections 16 37 – Wire Diagram Hydronic Heat – PSC Motor – w/FS and Pump 36
18 – Component Locations – Electric Heat Control Box 26 38 – Wire Diagram 3kW-10kW Electric HT- C.T. Motor w/ Lockout 37
19 – Component Locations – No Heat Control Box 27 39 – Wire Diagram Electric Heat – C.T. Motor w/ FS – No Pump 37
20 – Component Locations – Hydronic Heat Control Box 27 40 – Wire Diagram Electric Heat – C.T. Motor w/ FS and Pump 38
LIST OF TABLES
1 – SEHX General Specifications 4 19 – SCWW/CCWW Chilled Water Capacity 4&5 Row Coil – C.T. 21
2 – CEHX General Specifications 4 20– SCWW/CCWW Hot Water Capacity 4&5 Row Coil PSC 22
3 – SCWE General Specifications 4 21 – SCWW/CCWW Hot Water Capacity 4&5 Row Coil – C.T. 23
4 – CCWE General Specifications 4 22 – SCWW/CCWW Hot Water Capacity 2 Row HW Coil - PSC 23
5 – SDXW General Specifications 4 23 – SCWW/CCWW Hot Water Capacity 2 Row HW Coil – C.T. 23
6 – CDXW General Specifications 4 22 – SDXW/CDXW Hot Water Capacity 2 Row HW Coil - PSC 24
7 – SCWW General Specifications 5 23 – SDXW/CDXW Hot Water Capacity 2 Row HW Coil – C.T. 24
8 – CCWW General Specifications 5 24 – Wiring Requirements 208/240 VAC Electric Heat 18-37 Models25
9 – CEHX/CCWE/CDXW/CCWW Dimensional Data 5 25 – Wiring Requirements 120 VAC Hydronic Heat 18-37 Models 25
10 – SEHX/SCWE/SDXW/SCWW Dimensional Data 6 26 – Electric Heater Electrical Data 25
11 – SEHX/CEHX/SCWE/CCWE Model Nomenclature 7 27 – Electrical Data 26
12 – Clearance to Combustibles 8 28 – Low Voltage Wire Gauge and Maximum Lengths 27
13 – Optional Ceiling Access Panels 9 29 – White Rodgers Thermostat Terminal Designations 29
14 – SCWE/CCWE/ Chilled Water Capacity 4&5 Row Coil – PSC 16 30 – Typical Air Handler Unit TStat Pigtail Wire Colors & Connect 31
15 – SCWW/CCWW Chilled Water Capacity 4&5 Row Coil – C.T. 17 31 – Typical Cooling Unit Thermostat Wire Colors & Connections 31
16 – SCWE/CCWE Hot Water Capacity 4&5 Row Coil – PSC 18 32 – Typical Heat Pump Thermostat Wire Colors & Connections 31
17 – SCWE/CCWE Hot Water Capacity 4&5 Row Coil – C.T. 19 33 – Constant Torque Motor Terminals 33
18 – SCWW/CCWW Chilled Water Capacity 4&5 Row Coil - PSC 20
SECTION I: GENERAL
The following list includes important facts and information
regarding the electric furnace and its inclusions.
1. Horizontal Air Handler Unit is rated at either 120 volts AC
or 240 volts AC at 60 Hertz - 1 Phase
2. Horizontal Air Handler Unit is not designed to operate
with a 50 HZ voltage supply.
3. Horizontal Air Handler Unit size varies by model
4. Four-wire thermostat operation for heating and cooling
5. Seven wire thermostat for heat pump operation.
6. Horizontal Air Handler Unit is equipped with blower for
A/C or Heat Pump operation for horizontal applications
only.
7. This air handler must not be operated without the door
installed
NOTE: This Horizontal Air Handler Unit and its components listed on
the A/C and Heat Pump equipment sticker were listed in combination
as a system by ETL for the United States and Canada.
SAVE THIS MANUAL FOR FUTURE REFERENCE

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SECTION II: SAFETY
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: indicated 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.
IMPORTANT
Safety Requirements
This appliance 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 unit rating plate for the air horizontal Air
Handler unit model number, and then see the dimensions
page of this instruction for return air plenum dimensions in
Figure 2 and Table 9 also Figure 3 and Table 10. The
plenum must be installed according to the above listed
codes or the instructions in this manual.
2. Refer to the dimensions page of this instruction to
determine the proper location to install the horizontal Air
Handler unit for horizontal applications.
3. These models ARE NOT ETL listed or approved for
installation into a Manufactured (Mobile) Home.
4. Provide clearances from combustible materials as listed
under Clearances to Combustibles.
5. Provide clearances for servicing ensuring service access is
allowed for the control box, electric elements, hot water
coil and the blower.
6. Check the rating plate and the power supply to be sure the
electrical characteristics match.
7. Failure to carefully read and follow all instructions in this
manual can result in malfunction of the horizontal Air
Handler unit, death, personal injury, and/or property
damage.
8. Electric horizontal Air Handler unit shall 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 qualified personnel should install repair or
service heating/cooling equipment. Untrained service
personnel can perform basic maintenance functions such as
cleaning of exterior surfaces and replacing the air filters.
Observe all precautions in the manuals and on the attached
labels when working on this appliance.
11. These instructions cover minimum requirements and
conform to existing national standards and safety codes. In
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.
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
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.

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some instances these instructions exceed certain local codes
and ordinances, especially those who have not kept up with
changing home construction practices. These instructions
are to be followed and are the minimum requirement for a
safe installation.
12. The size of the unit should be based on an acceptable heat
loss calculation for the structure. ACCA, Manual J or other
approved methods may be used.
13. The 115 VAC models use nominal 115 VAC, 1 Phase, 60-
Hertz power supply. DO NOT CONNECT THIS
APPLIANCE TO A 50 HZ POWER SUPPLY OR A
VOLTAGE ABOVE 132 VOLTS OR BELOW 98 VOLTS.
14. The 208/230 VAC models use nominal 208 or 230 VAC, 1
Phase, 60-Hertz power supply. DO NOT CONNECT THIS
APPLIANCE TO A 50 HZ POWER SUPPLY OR A
VOLTAGE ABOVE 253 VOLTS OR BELOW 187
VOLTS.
15. Ground connections MUST BE securely fastened to the
control box and ground wires MUST BE secured to the
ground lugs in the control box.
16. Duct work must be installed in accordance with the
standards of the National Fire Protection Association
(NFPA) for the installation of Air Conditioning, Warm Air
Heating and Ventilation Systems (NFPA 90A and 90B).
The air distribution duct should be sized for 0.2 inches of
static pressure. See National Environmental Systems
Contractors Association Manual K for duct sizing.
17. The safety testing label appearing on this unit covers the
unit and the factory installed coil (if provided) only. It does
not cover any other equipment.
18. Exterior surface of the cabinet may sweat when installed in
a non-conditioned space such as an attic or garage. Installer
must provide a protection such as a full size auxiliary drain
pan under all units installed in the non-conditioned space.
The drain pan is needed to prevent damage from
condensation runoff on the unit casing.
19. Cabinet insulation is rated for R-2.1 (standard) Nominal
½”. Some jurisdictions require R-4.2 or R-6.0 on
installations in a non-conditioned space. Add 1” thick
insulation to the exterior casing of the unit to comply in
these jurisdictions, putting the vapor barrier on the outside.
GENERAL INFORMATION
This horizontal Air Handler unit provides the flexibility for
installation in any horizontal application. The versatile models
may be used with or without electric heat. The direct drive three
(3) speed PSC motor or five (5) speed Constant Torque Motor
will provide an air volume to match any application.
The unit can be positioned for bottom or air return through the
end of the unit in the horizontal position.
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 air handler you should
check the cabinet for screws or bolts which may have loosened
in transit. Some units have blower motor supports over the
motor shaft. Remove support before operating the horizontal Air
Handler unit.
See local Distributor for more information. Mortex Products,
Inc assumes no liability for freight damage.
Check the connecting of the wiring, electric heater, ducts or
piping to make sure there is easy access to the horizontal Air
Handler unit during the installation.
CASED ENCLOSURE MOUNTING
The installer must adhere strictly to all local and national code
requirements pertaining to the installation of this equipment.
These enclosures are designed to be installed in the ceiling for
horizontal mounting only.
Location of the unit must be in an area providing adequate
access to the ceiling panel since all components must be
serviced from this area.
The enclosure should be lifted to the desired location and
secured using the mounting holes located on the top with an
acceptable mounting method (Figure 1). The enclosure must be
level in both directions to permit proper drainage of the Air
Handler.
After the enclosure is mounted a 2x2 or 2x4 frame must be
installed around the base of the enclosure to create an air tight
seal and support for ceiling panel frame. Figure 1 shows a
typical arrangement for the framing required.
Figure 1: Cased Enclosure Mounting
ALWAYS SHUT OFF ELECTRICITY AT THE
DISCONNECT SWITCH OR TURN OFF THE CIRCUIT
BREAKERS IN THE MAIN ELECTRICAL ENTRANCE
BEFORE PREFORMING ANY SERVICE ON THE
A
PPLIANCE.
Extreme caution must be taken that no internal
damage will result if screws or holes are drilled into
the cabinet.

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CASED ENCLOSURE WITH AIR HANDLER IS
FACTORY MOUNTED “ONLY”
NOTE: Before mounting the enclosure check to see if the Air
Handler unit is fully engaged into the supply duct flange. Total
engagement is when the front of the top plate and the front of
the drain pan are squeezing against the insulation. Also check to
make certain that the Air Handler unit is secured firmly to the
enclosure with sheet metal screws through the mounting angle.
Refer to enclosure mounting instructions on page 3.
UNCASED AIR HANDLER MOUNTING
It is important to ensure that the Air Handlers are securely
mounted and the structure is sufficient to support the weight of
the Air Handler unit. All anchors for mounting the Air Handler
unit must be placed and sized to ensure a safe and durable
installation.
These Air Handler units are provided with four (4) mounting
slots. Metal washers and nuts of the proper size are to be
provided by the installer. If the Air Handler unit is not level use
shims to obtain proper level. This will ensure that the
condensate will drain from the unit.
Model No. Nominal
Tons Blower HP
CFM @
0.2" ESP
With Coil
Nominal Heating
Capacity in kW
SEHX-18-XX-0A-0C79 1.50 1/4 720 00, 03, 05, 06, 08, 10
SEHX-19-XX-0E-0C79 1.58 1/4 805 00, 03, 05, 06, 08, 10
SEHX-24-XX-09-0C79 2.00 1/4 850 00, 03, 05, 06, 08, 10
SEHX-25-XX-0H-0C65 2.08 1/4 1040 00, 03, 05, 06, 08, 10
SEHX-30-XX-0J-0C65 2.50 1/4 1055 00, 03, 05, 06, 08, 10
SEHX-31-XX-05-0C65 2.58 1/4 1040 00, 03, 05, 06, 08, 10
SEHX-34-XX-0K-0C65 2.83 1/4 1084 00, 03, 05, 06, 08, 10
SEHX-35-XX-01-0C65 2.92 1/4 1049 00, 03, 05, 06, 08, 10
SEHX-36-XX-0K-0C65 3.00 1/4 1100 00, 03, 05, 06, 08, 10
SEHX-37-XX-01-0C65 3.08 1/4 1065 00, 03, 05, 06, 08, 10
Table 1: SEHX General Specifications
Model No. Nominal
Tons Blower HP
CFM @
0.2" ESP
With Coi
l
Nominal Heating
Capacity in kW
CEHX-18-XX-0A-0C79 1.50 1/4 720 00, 03, 05, 06, 08, 10
CEHX-19-XX-0E-0C79 1.58 1/4 805 00, 03, 05, 06, 08, 10
CEHX-24-XX-09-0C79 2.00 1/4 850 00, 03, 05, 06, 08, 10
CEHX-25-XX-0H-0C65 2.08 1/4 1040 00, 03, 05, 06, 08, 10
CEHX-30-XX-0J-0C65 2.50 1/4 1055 00, 03, 05, 06, 08, 10
CEHX-31-XX-05-0C65 2.58 1/4 1040 00, 03, 05, 06, 08, 10
CEHX-34-XX-0K-0C65 2.83 1/4 1084 00, 03, 05, 06, 08, 10
CEHX-35-XX-01-0C65 2.92 1/4 1049 00, 03, 05, 06, 08, 10
CEHX-36-XX-0K-0C65 3.00 1/4 1100 00, 03, 05, 06, 08, 10
CEHX-37-XX-01-0C65 3.08 1/4 1065 00, 03, 05, 06, 08, 10
Table 2: CEHX General Specifications
Model No. Nominal
Tons Blower HP
CFM @
0.2" ESP
With Coil
NominalHeating
Capacity in kW
SCWE-18-XX-0A-0C79 1.50 1/4 720 00, 03, 05, 06, 08, 10
SCWE-19-XX-0E-0C79 1.58 1/4 805 00, 03, 05, 06, 08, 10
SCWE-24-XX-09-0C79 2.00 1/4 850 00, 03, 05, 06, 08, 10
SCWE-25-XX-0H-0C65 2.08 1/4 1040 00, 03, 05, 06, 08, 10
SCWE-30-XX-0J-0C65 2.50 1/4 1055 00, 03, 05, 06, 08, 10
SCWE-31-XX-05-0C65 2.58 1/4 1040 00, 03, 05, 06, 08, 10
SCWE-34-XX-0K-0C65 2.83 1/4 1084 00, 03, 05, 06, 08, 10
SCWE-35-XX-01-0C65 2.92 1/4 1049 00, 03, 05, 06, 08, 10
SCWE-36-XX-0K-0C65 3.00 1/4 1100 00, 03, 05, 06, 08, 10
SCWE-37-XX-01-0C65 3.08 1/4 1065 00, 03, 05, 06, 08, 10
Table 3 SCWE General Specifications
Model No. Nominal
Tons Blower HP
CFM @
0.2" ESP
With Coil
NominalHeating
Capacity in kW
CCWE-18-XX-0A-0C79 1.50 1/4 720 00, 03, 05, 06, 08, 10
CCWE-19-XX-0E-0C79 1.58 1/4 805 00, 03, 05, 06, 08, 10
CCWE-24-XX-09-0C79 2.00 1/4 850 00, 03, 05, 06, 08, 10
CCWE-25-XX-0H-0C65 2.08 1/4 1040 00, 03, 05, 06, 08, 10
CCWE-30-XX-0J-0C65 2.50 1/4 1055 00, 03, 05, 06, 08, 10
CCWE-31-XX-05-0C65 2.58 1/4 1040 00, 03, 05, 06, 08, 10
CCWE-34-XX-0K-0C65 2.83 1/4 1084 00, 03, 05, 06, 08, 10
CCWE-35-XX-01-0C65 2.92 1/4 1049 00, 03, 05, 06, 08, 10
CCWE-36-XX-0K-0C65 3.00 1/4 1100 00, 03, 05, 06, 08, 10
CCWE-37-XX-01-0C65 3.08 1/4 1065 00, 03, 05, 06, 08, 10
Table 4 CCWE General Specifications
Available Blower Motors on Electric Heat Models
1. Standard Blower Motor - – 3 SPD PSC Motor
2. Optional Blower Motor 5 SPD Constant Torque
Motor
Model No. Nominal
Tons Blower HP
CFM @
0.2" ESP
With Coil
Nominal Hot Water
Capacity in BTU/H
@140 DEGF EWT
SDXW-18-21-0A-0A78 1.50 1/4 720 21,000
SDXW-19-22-0E-0A78 1.58 1/4 805 22,000
SDXW-24-23-09-0A78 2.00 1/4 850 23,000
SDXW-25-23-0H-0A70 2.08 1/4 1040 23,000
SDXW-30-27-0J-0A70 2.50 1/4 1055 27,000
SDXW-31-28-05-0A70 2.58 1/4 1040 28,000
SDXW-34-30-0K-0A70 2.83 1/4 1084 30,000
SDXW-35-30-01-0A70 2.92 1/4 1049 30,000
SDXW-36-32-0K-0A70 3.00 1/4 1100 32,000
SDXW-37-32-01-0AC70 3.08 1/4 1065 32,000
Table 5: SDXW General Specifications
Model No. Nominal
Tons Blower HP
CFM @
0.2" ESP
With Coi
l
NominalHot Water
Capacity in BTU/H
@140 DEGF EWT
CDXW-18-21-0A-0A78 1.50 1/4 720 21,000
CDXW-19-22-0E-0A78 1.58 1/4 805 22,000
CDXW-24-23-09-0A78 2.00 1/4 850 23,000
CDXW-25-23-0H-0A70 2.08 1/4 1040 23,000
CDXW-30-27-0J-0A70 2.50 1/4 1055 27,000
CDXW-31-28-05-0A70 2.58 1/4 1040 28,000
CDXW-34-30-0K-0A70 2.83 1/4 1084 30,000
CDXW-35-30-01-0A70 2.92 1/4 1049 30,000
CDXW-36-32-0K-0A70 3.00 1/4 1100 32,000
CDXW-37-32-01-0A70 3.08 1/4 1065 32,000
Table 6: CDXW General Specifications
It is recommended that the enclosure and Air Handler
be protected (covered) during the dry wall and
painting process to prevent the spraying of the
material into the enclosure and on the Air Handle
r
.

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Model No. Nominal
Tons Blower HP
CFM @
0.2" ESP
With Coil
NominalHot Water
Capacity in BTU/H
@140 DEGF EWT
SCWW-18-21-0A-0A78 1.50 1/4 720 21,000
SCWW-19-22-0E-0A78 1.58 1/4 805 22,000
SCWW-24-23-09-0A78 2.00 1/4 850 23,000
SCWW-25-23-0H-0A70 2.08 1/4 1040 23,000
SCWW-30-27-0J-0A70 2.50 1/4 1055 27,000
SCWW-31-28-05-0A70 2.58 1/4 1040 28,000
SCWW-34-30-0K-0A70 2.83 1/4 1084 30,000
SCWW-35-30-01-0A70 2.92 1/4 1049 30,000
SCWW-36-32-0K-0A70 3.00 1/4 1100 32,000
SCWW-37-32-01-0A70 3.08 1/4 1065 32,000
Table 7 SCWW General Specifications
Model No. Nominal
Tons Blower HP
CFM @
0.2" ESP
With Coil
Nominal Hot Water
Capacity in BTU/H
@140 DEGF EWT
CCWW-18-21-0A-0A78 1.50 1/4 720 21,000
CCWW-19-22-0E-0A78 1.58 1/4 805 22,000
CCWW-24-23-09-0A78 2.00 1/4 850 23,000
CCWW-25-23-0H-0A70 2.08 1/4 1040 23,000
CCWW-30-27-0J-0A70 2.50 1/4 1055 27,000
CCWW-31-28-05-0A70 2.58 1/4 1040 28,000
CCWW-34-30-0K-0A70 2.83 1/4 1084 30,000
CCWW-35-30-01-0A70 2.92 1/4 1049 30,000
CCWW-36-32-0K-0A70 3.00 1/4 1100 32,000
CCWW-37-32-01-0A70 3.08 1/4 1065 32,000
Table 8 CCWW General Specifications
Available Blower Motors on Hot Water Heat Models
1. Standard Blower Motor - – 3 SPD PSC Motor
2. Optional Blower Motor 5 SPD Constant Torque
Motor
Figure 2: CEHX/ CCWE/ CDXW/ CCWW DIMENSIONAL DATA DX OR CHILLER WATER COOLING WITH
OR WITHOUT ELECTRIC HEAT
ABCDEFGH
CEHX / CCWE / CDXW / CCWW - 18 41 2.625 7.125 4 3 5.25 2.625 3.75
CEHX / CCWE / CDXW / CCWW - 19 41 2.625 7.125 4 3 5.25 2.625 3.75
CEHX / CCWE / CDXW / CCWW - 24 41 2.625 7.125 4 3 5.25 2.625 3.75
CEHX / CCWE / CDXW / CCWW - 25 47 2 10.5 2.5 1.5 4.625 2 2.6875
CEHX / CCWE / CDXW / CCWW - 30 47 2 10.5 2.5 1.5 4.625 2 2.6875
CEHX / CCWE / CDXW / CCWW - 31 47 2 10.5 2.5 1.5 5.875 2 2.6875
CEHX / CCWE / CDXW / CCWW - 34 53.5 3.25 13.75 3.25 2.75 5.875 3.25 3.9375
CEHX / CCWE / CDXW / CCWW - 35 53.5 3.25 13.75 3.25 2.75 5.875 3.25 3.9375
CEHX / CCWE / CDXW / CCWW - 36 60.5 3.25 17.5 3.25 2.75 5.875 3.25 3.9375
CEHX / CCWE / CDXW / CCWW - 37 60.5 3.25 17.5 3.25 2.75 5.875 3.25 3.9375
Model Number Physical Dimensions
Table 9: CEHX/ CCWE/ CDXW/ CCWW DIMENSIONAL DATA

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Figure 3: SEHX/ SCWE/ SDXW/ SCWW DIMENSIONAL DATA DX OR CHILLED WATER COOLING WITH
OR WITHOUT ELECTRIC HEAT
Liquid
Line Suction Line Evap. Rows A B C Ship Weight
SEHX / SCWE / SDXW / SCWW - 18 3/8 3/4 3 37 34.25 30 60
SEHX / SCWE / SDXW / SCWW - 19 3/8 3/4 4 37 34.25 30 65
SEHX / SCWE / SDXW / SCWW - 24 3/8 3/4 3 37 34.25 30 60
SEHX / SCWE / SDXW / SCWW - 25 3/8 3/4 4 45 42.25 38 75
SEHX / SCWE / SDXW / SCWW - 30 3/8 3/4 3 45 42.25 38 70
SEHX / SCWE / SDXW / SCWW - 31 3/8 3/4 4 45 42.25 38 75
SEHX / SCWE / SDXW / SCWW - 34 3/8 3/4 3 49 46.25 42 74
SEHX / SCWE / SDXW / SCWW - 35 3/8 3/4 4 49 46.25 42 80
SEHX / SCWE / SDXW / SCWW - 36 3/8 3/4 3 56 53.25 49 85
SEHX / SCWE / SDXW / SCWW - 37 3/8 3/4 4 56 53.25 49 90
Model Number Physical Dimensions
Table 10: SEHX/ SCWE/ SDXW/ SCWW DIMENSIONAL DATA

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EHXS2 4 0 3 ED1C79
SERIES
S - Horizontal Firdown Unit Uncased
C - Horizontal Firdown Unit Cased
TYPE
EHX - DX Coil andElectric Heat
CWE - Chilled Water Coil and Electric Heat
DXW - DX Coil and Hot Water Heat
CWW - Chilled Water Coil and Hot Water Heat
Tons
Nominal Cooling BTUH
Heating Capacity
03 - Electric Heat Capacity in kW
26 - Hot Water Heat Capacity in M/BTUH
Orifice or Expansion Valve Number
D - TXV4-A (E410A 1.5 to 2.5 Ton)
Y - TXV4-A (R410A 3.0 Ton)
Expansion Device Code
E = Expansion Valve (DX)
Time DelayRelay
1 - With TDR (Standard)
Unit Voltage
A - 115/1/60
C - 208/240/1/60
Motor&WheelCode
65 - 1/4 HP, 208/240V, PSC, with (2) 6.25x8.00
70 - 1/4 HP, 115V, PSC, with (2) 6.25x8.00
78 - 1/4 HP, 115V, PSC, with (2) 6.25x6.88
79 - 1/4 HP, 240V, PSC, with (2) 6.25x6.88
80 - 1/3 HP, 208/230V, CT, with (2) 7.00x8.00
81 - 1/2 HP, 208/240V,CT, with (2) 7.00x9.00
82 - 1/3 HP, 115V,CT, with (2) 7.00x8.00
83 - 1/2 HP, 115V,CT, with (2) 7.00x9.00
2 = 2 Pipe Chilled Water (CW)
4 = 4 Pipe Chilled Water (CW)
4 - 4 Row ChilledWater Coil (CW)
5 - 5 Row ChilledWater Coil (CW)
Table 11: SEHX/CEHX/SCWE/CCWE/SDXW/CDXW/SCWW/CCWW Model Nomenclature
SECTION IlI: CLEARANCE AND RETURN
AIR REQUIREMENTS
LOCATION
Access for servicing is an important factor in the location of any
Air Handler unit. Provide a minimum of 27 inches under the
appliance for access to the control box, heating elements, water
pump, blower and air filters. The unit can be serviced entirely
from the bottom of the unit, including replacing the air filter on
models that include a filter rack. These units are NOT designed
to be installed in a closet or flush mounted in a wall in an up
flow vertical position. The Air Handler unit is designed for
horizontal application ONLY.
Be sure to route primary and secondary drain connections
so as not to obstruct replacement filter.
Location is usually predetermined. Check with owner’s or
dealer’s installation plans. If location has not been decided,
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. Unit is designed to fit in a 12” high drop down
space (Furred-In Area).
2. Where 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 unit so
that supply and return air ducts can deliver an even air
distribution of supply and return air to and from the living
spaces.
4. Locate appliance where electrical supply wiring can be
easily routed to main electrical panel and where electrical
wiring will not be damaged. Supply power wiring may be
installed in a flexible conduit or armored cable. The
installer must refer to National Electrical Code (NFPA 70),
Canadian Electrical Code, Part I (CSA C22.2), ANSI/NFPA
No. 70 and/or any local codes to ensure supply wiring
complies with all applicable codes for the location the
Horizontal Air Handler is being installed.
5. Locate appliance where thermostat wiring can be easily
routed to the thermostat and where the wiring will not be
damaged. Be sure wire has enough length so it will not to
block access to any components that may need to be
replaced or serviced.
6. Locate appliance where refrigerant lines can be easily
routed from the evaporator coil to the condenser.
7. When the coil is installed in a blow-thru application it will
create a positive pressure situation in the condensate drain
system. To prevent condensate from being blown out of the
condensate drain, it is recommended an anti-siphon air vent
be installed as shown in figure 16. This will allow proper
draining of the primary (Main) and secondary (Overflow)
drain lines. Refer to CONDENSATE DRAIN SYSTEM
and Figure 16 in these instructions.
NOTE: The condensate drain trap is not required on a
blow-thru system providing the drain pipe is not connected
to a sewer line.
NOTE: The condensate trap may be required by local
codes.
If the secondary drain is not used, it must be capped.
8. The blow-thru design will cause exterior surface of cabinet
to sweat when units is installed in a non-conditioned space
such as an attic or garage. Installer must provide protection

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such as full size auxiliary drain pan on all units installed in
a non-conditioned space to prevent damage from
condensation runoff.
9. All return air must be filtered to prevent a buildup of dirt on
the coil surface.
Appliance Clearances
This appliance 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 on the supply
plenum and supply air duct when an electric heater is installed
in the appliance. Refer to Table 12 for the clearance to
combustibles.
Figure 4: Clearance – Access for Service
Table 12: Clearance to Combustibles
Un-cased Horizontal Air Handler Return Air
The uncased Air Handler unit can have a non metallic ducted
return that can have a return air opening that is located between
the joists and the sheet rock that can carry the return air from a
return air filter grille in a ceiling to the horizontal Air Handler
unit.
Provisions shall be made in this type of return air system is
large enough to permit the air in the rooms and the living
spaces to return to the Air Handler unit. Failure to comply
may cause a reduction in the amount of return air available to
the blower, causing reduced air flow resulting in improper
heating and cooling of the living space. The reduced air flow
may cause the furnace to cycle on the limit causing premature
heating element failure and/or condensate water blow off.
The return air grille or duct can never be located in a closet.
Cased Horizontal Air Handler Return Air
The cased horizontal Air Handler unit can use the louvered
ceiling access panel on the horizontal Air Handler unit as a
means of returning the conditioned air from the living space to
the Air Handler unit.
The cased horizontal Air Handler unit can also have a non-
louvered ceiling access panel with the return air ducted using a
return plenum and duct system. The ducted return air can be
located straight down to the ceiling where it is terminated using
a return air filter grille. The ducted return can also travel
through the space between the joists and sheet rock and be
terminated with a return air filter grille located away from the
horizontal Air Handler unit.
Provisions shall be made in the duct system to ensure it is
large enough permit the proper amount of air to be returned
from the living spaces to the horizontal Air Handler unit.
Failure to comply may cause a reduction in the amount of
return air available to the blower, causing reduced air flow
resulting in improper heating of the living space. The reduced
air flow may cause the furnace to cycle on the limit causing
premature heating element failure.
Air Filter Location
Horizontal Air Handler Units are not factory equipped with an
air filter. The air filter can be installed on the louvered ceiling
access panel or the air filters can be located remotely in the
return air filter grille.
If a non metallic return system or a ducted return system is
installed and a return air filter grille is used at the opposite end
of the duct a non-louvered ceiling access panel will be required.
The louvered ceiling panel air filter sizes for the SEHX, CEHX,
SCWE and the CCWE models are 20” x 20” x 1”
The recommended minimum filter size for a return air filter
grille is:
Standard Throw away Air Filter @ 300 ft/min or less
600 CFM = 16 x 20 x 1
700 CFM = 20 x 20 x 1
800 CFM = 20 x 20 x 1
900 CFM = 20 x 24 x 1
1000 CFM = 20 x 24 x 1
Pleated filters are not recommended for use with PSC Motors
NON METALIC DUCTED RETURN SYSTEMS MAY
NOT BE ALLOWED IN SOME STATES, COUNTIES,
OR CITIES.
CHECK ALL STATE, LOCAL AND FIRE CODES TO
DETERMINE IF THIS TYPE OF RETURN SYSTEM IS
ALLOWED WHERE THE HORIZONTAL AIR
HANDLER UNIT IS BEING INSTALLED.
FIRE HAZARD:
NON METALIC DUCTED RETURN SYSTEMS WILL
COLLECT DUST AND DEBRIS WHICH CAN RESULT
IN A FIRE HAZARD. BE SURE TO THOROUGHLY
CLEAN THIS SYSTEM TO REMOVE ALL DUST AND
DEBRIS ANNUALLY.

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Figure 5: Ceiling Access Panel.
Table 13: Optional Ceiling Access Panels.
SECTION IV: AIR HANDLER & SUPPLY AIR
DUCT INSTALLATION
CASED AIR HANDLER SUPPLY DUCT
CONNECTIONS:
The horizontal Air Handler case can be mounted into the ceiling
so there can be a horizontal left supply air flow or a horizontal
right supply air flow. The supply plenum is attached and secured
to the horizontal Air Handler case duct flanges by use of screws.
Use a Non-tape sealant such as mastic or an aerosol sealant to
seal the plenum to prevent air leakage. The supply plenum must
be the same size as the supply air opening.
The supply duct system must be designed as to maintain a 0.20
inches of water static pressure through the entire supply duct
system.
The supply air ducts are must be properly sized to carry the
proper amount of air from the horizontal Air Handler unit to the
conditioned spaces. If a hole is to be cut in the supply plenum
the hole needs to be the same size as the supply duct(s). Use a
duct starting collar to attach the ducts to the plenum. Use a Non-
tape sealant such as mastic or an aerosol sealant to seal the
plenum to prevent air leakage.
If the cased horizontal Air Handler unit installed in an un-
conditioned space be sure the supply and return duct system is
insulated and installed in accordance with local codes.
UN-CASED AIR HANDLER SUPPLY DUCT
CONNECTIONS:
The horizontal Air Handler case can be mounted into the ceiling
so there can be a horizontal left supply air flow or a horizontal
right supply air flow. The supply plenum is attached and secured
to the horizontal Air Handler case duct flanges by use of screws.
Use a Non-tape sealant such as mastic or an aerosol sealant to
seal the plenum to prevent air leakage. The supply plenum must
be the same size as the supply air opening.
The supply duct system must be designed as to maintain a 0.20
inches of water static pressure through the entire supply duct
system.
The supply air ducts are must be properly sized to carry the
proper amount of air from the horizontal Air Handler unit to the
conditioned spaces. If a hole is to be cut in the supply plenum
the hole needs to be the same size as the supply duct(s). Use a
duct starting collar to attach the ducts to the plenum. Use a duct
starting collar to attach the ducts to the plenum. Use a Non-tape
sealant such as mastic or an aerosol sealant to seal the plenum to
prevent air leakage.
If the horizontal Air Handler unit installed in an un-conditioned
space be sure the supply and return duct system is insulated and
installed in accordance with local codes.
USING THE LOUVERED CEILING ACCESS PANEL
FOR AIR RETURN WILL RESULT IN A VERY LOUD
AND NOISY SITUATION.WHEN THE AIR HANDLER
UNIT IS OPERATING.
USING A DUCTED RETURN WILL RESULT IN A
MUCH QUITEIER SITUATION WHEN THE AIR
HANDLER UNIT IS OPERATING.
IMPACT HAZARD
Use extreme caution when removing the Ceiling
Access Panel screws. The panel is secured to the
frame assembly with the thumb screws. Once the
thumb screws have been removed the Ceiling Access
Panel will swing down very quickly. Anyone that
standing under the Ceiling Access Panel will get hit
with the panel unless the panel is supported by holding
it with their hands.
The louvers can also have sharp edges which can cut
hands or fingers. The use of gloves is recommended
when servicing the horizontal Air Handler unit.

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SECTION V: AIR HANDLER INSTALLATION
Installing the Air Handler Unit
Ceiling Installation
If installed in a ceiling, the area in the ceiling where the unit is
to be located should have a framed in structure all around the
unit so the Air Handler unit can be properly mounted and
secured. The ceiling must be 12 inches in height. Prior to
installing the furnace make sure the holes are cut into the frame
for the refrigerant tubing, the drain line, the electrical wiring, the
thermostat wiring and the condenser control wiring. Care should
be taken to insure unit is level to permit proper condensate
drainage.
To properly install the cased horizontal Air Handler unit you
must do the following:
1. Remove the top shipping cover and corner posts.
2. Remove the bottom shipping cover.
3. Remove the control box access panel.
4. Use screws to secure the four (4) straps to the ceiling where
the horizontal Air Handler unit will be installed. Be sure the
straps are located so the hooks in the straps line up with the
slots in the base of the horizontal Air Handler unit.
5. Raise the horizontal Air Handler unit into the space where it
is going to be installed and put the hooks into the slots in
the base. Bend the hooks back to keep the hooks from
slipping out of the slots in the base.
6. Connect the supply air plenum to the horizontal Air
Handler unit as described in cased Air Handler supply duct
connections.
7. If the louvered ceiling access panel is not being used and
solid ceiling access panels is being used then, connect the
return air plenum to the horizontal Air Handler unit as
described in cased Air Handler return air duct connections.
8. Connect the electrical supply wires and the thermostat
control wires in the control box. Be sure to install an
ON/OFF switch in the supply circuit to disconnect the
power during servicing.
9. Connect the refrigerant lines or chilled water lines to the
coil.
10. Re-install the ceiling access panel and control box access
panel and secure with the screws that were removed in step
2
11. Turn the power on to the unit by following the procedure in
the Users Information Manual.
12. Set the thermostat to the desired temperature.
To properly install the un-cased horizontal Air Handler unit you
must do the following:
1. Remove the top shipping cover and corner posts.
2. Remove the screws from the control box cover and remove
the cover.
3. Remove the bottom shipping cover.
4. Use four (4) lag bolts with washers to go thru the slots in
the top cover that secure the horizontal Air Handler unit to
the ceiling where the horizontal Air Handler unit will be
installed.
5. Raise the horizontal Air Handler unit into the space where it
is going to be installed and install the lag bolts thru the slots
in the top cover. Tighten the lag bolts until the horizontal
Air Handler unit is securely fastened to the ceiling.
6. Connect the supply air plenum to the horizontal Air
Handler unit as described in cased Air Handler supply duct
connections.
7. Connect the electrical supply wires and the thermostat
control wires in the control box. Be sure to install a
ON/OFF switch in the supply circuit to disconnect the
power during servicing.
8. Connect the refrigerant lines or chilled water lines to the
coil.
9. Install the control box access panel and secure with the
screws that were removed in Step 2.
10. Install the ceiling access panel and secure to the ceiling
frame with the thumb screws.
NOTE: Ceiling Access Panel is shipped separately. It is not
included with the Air Handler Unit.
11. Turn the power on to the unit by following the procedure in
the Users Information Manual.
12. Set the thermostat to the desired temperature.
SECTION VI: COOLING AND REFRIGERANT
PIPING
DX Cooling / Chilled Water Cooling
DX Refrigerant Piping:
Horizontal Air Handler Units with DX type evaporator coils
require liquid and suction piping sized in accordance with
condensing unit manufacturer’s instructions. The evaporator
coils have sweat copper connections. Refrigerant lines should be
soldered with silver solder or high temperature brazing alloy.
Suction line must be insulated to avoid condensate from forming
and dropping off. Armaflex (or equivalent) with 3/8” (1 cm)
minimum wall thickness is recommended. In severe conditions
such as hot or high humidity areas require 1/2” (1.3 cm)
minimum wall thickness may be required. If condensing unit is
installed above evaporator coil then oil traps are required at
equal intervals along suction line (see Figure 6). Horizontal
suction lines should slope 1 inch for every 20 feet toward
condensing unit. Manufacturer recommends that dry nitrogen be
flowed through refrigerant lines during soldering operation.
Figure 6 Evaporator Below Condenser Piping

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SPECIAL INSTRUCTIONS FOR COILS WITH
THERMAL EXPANSION VALVES (TXV)
Thermal expansion valve (TXV) have a built in check valve
making them A/C and heat pump capable. Hard start kit may be
required on non-bleed TXV’s. 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
provided on coils.
A thermostatic expansion valve (TXV) is built around a
thermostatic element separated from the valve body by a
diaphragm. Its purpose is to regulate the rate at which
refrigerant flows into the evaporator.
Figure 7: The TXV Bulb Best Placement
The bulb is best mounted on a horizontal suction line tube and
in a position corresponding to between 1 o'clock and 4 o'clock.
The location depends on the outside diameter of the tube. Refer
to location shown in Figure 7.
Note: The bulb must never be located at the bottom of the
suction line due to the possibility of oil lying in the bottom of
the pipe causing false signals.
The 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.
Be sure that the expansion valve provided is the proper size and
type required to achieve rating. If a non-bleed type valve is to be
used, the outdoor unit must be equipped with a hard start kit
allowing the outdoor unit to start under load. Check with our
factory if necessary.
How the TXV Controls Superheat
The thermostatic expansion valve (TXV) is a precision device
designed to regulate the rate at which liquid refrigerant flows
into the evaporator. This controlled flow is necessary to prevent
the return of liquid refrigerant to the compressor.
The TXV separates the high pressure and low-pressure sides of
a refrigeration or air conditioning system. Liquid refrigerant
enters the valve under high pressure, but its pressure is reduced
when the TXV limits the amount of refrigerant entering the
evaporator.
Remember: the TXV controls only one thing: the rate of flow of
liquid refrigerant into the evaporator. The TXV is not designed
to control air temperature, head pressure, capacity, suction
pressure, or humidity. Attempts to use 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
line. By responding to these variables, the TXV maintains a
predetermined superheat within the evaporator. This is how the
TXV keeps the system in balance and operating properly. To
understand how this works, we must have a clear understanding
of superheat.
The TXV controls superheat by controlling the flow of liquid
refrigerant. As it does this, it also reduces refrigerant pressure.
Liquid refrigerant enters the TXV under high pressure. As the
flow of liquid refrigerant is reduced, its pressure drops. The
refrigerant leaving the TXV is now a combination of low-
pressure liquid and vapor.
As the flow is restricted, several things happen:
The pressure on the liquid refrigerant drops;
A small amount of the liquid refrigerant is converted
to gas, in response to the drop in pressure;
This "flash gas" represents a high degree of energy
transfer, as the sensible heat of the refrigerant is
converted to latent heat;
The low-pressure liquid and vapor combination moves
into the evaporator, where the rest of the liquid
refrigerant "boils off" into its gaseous state as it
absorbs heat from its surroundings.
Changes in gas temperature at the evaporator outlet are detected
by the sensing bulb, which then causes the valve pin to move in
or out, regulating the flow of refrigerant through the TXV. In
this way, the valve allows just enough refrigerant into the
evaporator, to maintain the correct level of superheat in the
suction line.
The TXV controls superheat by varying the size of the orifice
through which the refrigerant flows. The pin angle, the size of
the stroke (typically 0.015- to 0.035-in.) and the diameter of the
orifice itself all affect how much refrigerant can pass through
the valve. In addition, all valves have some leakage around the
valve pin, although this is normally kept within acceptable
limits.
It's important to remember that valve capacity is a function of
the orifice diameter, pin angle, and stroke. Adjusting the
superheat spring doesn't change valve capacity.
Trouble Shooting:
The thermostatic expansion valve (TXV) is like the carburetor
in your car's engine. It opens and closes to allow the correct
amount of refrigerant into your system. When the TXV isn't
working properly, the efficiency of your unit is crippled. If you
suspect you have a faulty TXV, perform these tests:
First, connect your gauges to the system and check that the
refrigerant pressures, subcooling and superheat are where they
should be (for pressures settings, refer to unit's pressure chart;
for subcooling (usually around 10°F) and superheat (between
8°F-12°F) follow manufacturer's specification sheet.

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Check to see if airflow through the system is good. There should
be no dirty coils or air filters. Also check for proper CFMs
readings across the system.
Make sure there's the right amount of refrigerant charge in the
system (this step may require weighing out the refrigerant in the
system). Once you've added or removed charge as necessary,
check the pressures, subcooling and superheat again. If there is
no change then it is probably the TXV.
Check the evaporator coil and remove the TXV's sensing bulb
from the suction line.
Check the subcooling, superheat and pressures again. If there's
no change, that's a further indication of a TXV problem.
Another test is to put the sensing bulb in ice water and checking
the pressures, superheat, and subcooling again. If they don't
change, it's a bad TXV.
When a non-bleed expansion valve (TXV) is specified in a
Summit AC or HP Rating, the following assumptions are made:
a) The TXV is a field or factory installed accessory to be field
or factory installed in accordance with recommended TXV
practice.
b) The combination of this non-bleed valve and the
compressor in the outdoor unit results in a system that
operates with a loaded condition on startup.
c) The outdoor unit is capable of starting against this loaded
condition or a hard start kit is to be field installed.
APPLICATION DATA:
R72DB0005 (R-22) 15% Bleed Non-Adjustable - 1.5-3.0 Ton
“T” Valve Letter Code
R72DB0003 (R-410A) 15%-Bleed Non-Adjustable-1.5–2.5 Ton
“D” Valve Letter Code
R72DB0004 (R-410A) 15%-Bleed Non-Adjustable-3.0–5.0 Ton
“Y” Valve Letter Code
Inlet Fitting Male Rotalock / Outlet Fitting Female swivel nut.
R72DB0006 (R-22) 15% Bleed Non-Adjustable - 3.0-5.0 Ton
“X” Valve Letter Code
R72DB0044 (R-410A) Non-Bleed Adjustable - 3.0-6.0 Ton
“Z” Valve Letter Code
Inlet Fitting Male Rotalock / Outlet Fitting Female swivel nut.
TXV TROUBLE SHOOTING:
Changing parts might be the first reaction, BUT…
1. May not be necessary and…
2. Does not always solve the problem.
SUPERHEAT AND SUCTION PRESSURE
LOW SUCTION PRESSURE – HIGH SUPERHEAT
POSSIBLE CAUSES:
1. Undersized valve
2. High superheat adjustment
3. Evaporator pressure drop – no external equalizer
4. External equalizer location – needs to be located on suction
line after the last feeder tube.
5. Restricted or capped external equalizer
6. Low refrigerant charge
7. Plugged dryer or strainer
8. Low pressure drop across valve:
a. Plugged dryer or strainer
b. Low condensing temperature
HIGH SUCTION PRESSURE – LOW SUPERHEAT
POSSIBLE CAUSES:
1. Oversized valve
2. TXV seat leak
3. Low superheat adjustment
4. Bulb installation:
a. Poor thermal contact
b. Warm location
5. Bad compressor – low capacity
6. Incorrectly located external equalizer line – needs to be
located on suction line after the last feeder tube.
LOW SUCTION PRESSURE – LOW SUPERHEAT
POSSIBLE CAUSES:
1. Low load:
a. Not enough air
b. Dirty air filters
c. Air too cold
d. Coil icing or frosting
2. Poor air distribution
3. Improper compressor evaporator balance – coil too big or
small or incorrect balance on heat pump systems.
4. Oil is trapped in the evaporator
Check these things before removing the TXV
1. Remove the sensing bulb and hold in your hand. The high
side pressure should drop and low side pressure should
increase as the TXV opens.
2. Loosen the flare nut on the TXV external equalizer tube
that is connected with a flare nut on the suction line. If you
get a lot of pressure when the nut has been loosened then
tighten the nut. If you get a slight pressure or no pressure;
the Schrader valve stem is not being depressed. Install a
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.
Figure 8: TXV Sensing Bulb Location
INSTALLATION NOTES:
With reference to the Figure 8, the TXV assembly is to be
installed between the distributor and the existing liquid line
Coil is pressurized with nitrogen. Relieve pressure before
installing TXV by depressing Schrader valve on coil
manifold.

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Field Installed:
1. After coil pressure has been relieved, turn the female swivel
nut counter-clockwise to remove.
2. If Flowrator Distributor Assembly is being replaced by a
TXV, remove the piston orifice from the flowrator
distributor assembly using a small diameter wire or paper
clip.
3. 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.
4. Attach liquid line with female swivel nut to male rotalock
fitting on TXV inlet (Aligning Teflon seal first) and torque
swivel nut to 10-30 ft. lbs.
5. Remove the cap on Schrader valve port on coil manifold.
Attach equalizer tubing with 1/4” female flare nut that
includes depressor to this male Schrader port. Torque nut
to 10-30 ft. lb
6. Install the TXV bulb to the suction manifold of coil or the
suction line using the two bulb clamps furnished with kit.
a. Bulb should be installed on a horizontal run of the
manifold if possible. On line less than 7/8” OD the
bulb may be installed on top of the line. With 7/8” OD
and over, the bulb should be installed in a position at
about 4 or 8 o’clock.
b. If bulb installation is made on a vertical run, the bulb
should be located at least 6 inches from any bend, and
on the tubing side opposite the plane of the bend. On
vertical 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.
7. After completing installation of TXV (including equalizer
tube), it will be necessary to leak check the coil and
evacuate the coil through the service access fittings of
liquid and suction line valves.
Figure 9 Typical TXV Connections
SPECIAL INSTRUCTIONS FOR COILS WITH
FLOWRATOR DISTRIBUTOR ASSEMBLIES
The sizing of the orifice piston should be based strictly on the
rated capacity of the outdoor unit and coil match.
Summit provides capacity performance ratings that match both
same size and upsized coils with specific manufacturer’s
outdoor units. At the Summit distributor’s request, the orifice
piston is selected and installed in each coil for the specific range
of cooling capacities likely to be encountered. The factory
installed orifice piston size is marked on the flowrator
distributor assembly and on the front of the coil carton.
When using this coil with an outdoor unit of another capacity,
select an orifice piston from the table below if the capacity
range for the coil and outdoor unit to be used differs.
Failure to install the proper orifice piston can lead to poor
system performance and possible compressor damage. A
variation of one piston size is not normally critical. 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 your
Summit supplier.
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.
ORIFICE PISTON REPLACEMENT:
If the flowrator distributor assembly is being used the piston is
to be installed as shown in Figure 10 in the distributor body then
the existing liquid line attached to the flowrator distributor.
1. After coil pressure has been relieved, turn the female swivel
nut counter-clockwise to remove.
2. Remove the piston from the flowrator distributor fitting
using a small diameter wire or paper clip. ALWAYS
REMOVE PISTON FROM DISTRIBUTOR BODY
WHEN TXV IS INSTALLED).
3. Replace the orifice piston with the correct piston for the coil
you are using. Make sure the tapered end of the piston is
facing the feeder tubes on the distributor body.
4. Turn the female swivel nut on clockwise the flowrator
distributor (aligning Teflon seal first) and torque swivel
nut to 10-30 ft. lbs.
5. After completing the replacement of the orifice piston, it
will be necessary to leak check the coil and evacuate the
coil through the service access fittings of liquid and suction
line valves.
Figure 10: Flowrator Distributor

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FIELD INSTALLED SUPPLEMENTAL HEAT
LOCKOUT (SHL) KIT:
Field Installed SHL is to be used with model SEHX and
CEHX models with factory installed electric heat used
with a heat pump system. The temperature switch is to
prevent excessive refrigerant liquid pressures due to the
evaporator coil being located after the electric heaters. If
the electric heater is energized while the heat pump is
operating in the heat mode, the added heat that the
evaporator coil will see will cause the refrigerant liquid
pressures to be excessively high. The SHL temperature
switch will lock out the electric heat until the refrigerant
liquid temperature falls to approximately 109°F causing
the switch to close. The switch resets (opens) at
approximately 120°F.
INSTALLATION:
Use the insulation tape that is provided in the kit. Wrap
sensor on liquid line and secure with the plastic ties that
are provided in the kit, refer to Figure 12. After the
brazing and leak testing of the refrigerant lines is complete
and the lines have cooled off mount the temperature
switch to the liquid line assuring temperature switch has
good contact with the liquid line and not located where it
may be damaged.
WIRING:
One of the pigtail leads are connected in series to the
white pigtail wire on the unit, refer to Figure 12. Secure
the wires with a wire nut. The other pigtail lead is
connected to the white thermostat wire and secured with a
wire nut. This wiring prevents the electric heaters from
energizing until the SHL switch closes. Check outdoor
unit and thermostat diagrams to assure the SHL will
prevent the supplemental electric heat from being
energized.
Figure 11: Proper Mounting of the SHL Temperature
Switch
R
C
G
W
R
C
G
W
SHL
Switch
Temperature
Closes at 110 DEGF
Figure 12: Proper Wiring of the SHL Temperature
Switch
SHL Switch Location
Figure 13 Heat Pump Heating Cycle: SHL switch is
secured to the 3/4” or 7/8” pipe next to the evaporator.
SHL Switch Location
Figure 14 Cooling Cycle: SHL switch is secured to the
3/4” or 7/8” pipe next to the evaporator.

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CONDENSATE DRAIN PIPING:
The horizontal Air Handler cooling DX coil condensate drain
pan has one ¾” NPT female primary and one ¾” NPT female
secondary connection is on the same side as the refrigerant
connections. The other side of the condensate drain pan is one
¾” NPT female primary drain connection and no secondary
drain connections. Refer to figure 15 for drain locations.
Figure 15: Condensate Drain Pan
Piping from each fitting used is to have 1-1/2 minimum trap 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. Cap unused connection.
Figure 16: Typical Condensate Traps
SECTION VII: HOT AND CHILLER WATER
Water Piping
All piping 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. Units are provided with manual air vents
mounted on coil manifold.
"Massachusetts requires an electronically controlled
pump timer thatactivates the pump every 6hours
water heater and the air handler to 50 feet max."
for 60 seconds and limitsthe distance between the
Total hot water piping should not exceed 140 feet. All hot water
piping to the coil should be 3/4 inch ID (7/8 inch OD) copper.
CPVC piping may be used in applications where the water
temperature does not exceed 150°F. It is recommended a water
isolation valve and a union be placed in the water lines to and
from the coil, near the coil, for serviceability, repair or
replacement of the coil.
After piping has been installed, allow the system to fill with
water and check connections for leaks. To insure complete
filling of the system, follow start-up procedure.
A thermal expansion tank is recommended on any closed loop
system to relieve thermal expansion due to pressure increase.
Horizontal Air Handler Unit must be located so that if any
connections should leak, water will not cause damage to
the adjacent area.
When such locations can’t be avoided, a suitable drain pan
should be installed under the air handler, not over 1-1/2”
deep, with minimum length and width at least 2” greater
than the air handler dimensions and connected to an
adequate drain.
Under no circumstances is the manufacturer to be held
liable for any water damage in connection with this
Horizontal Air Handler Unit.
Horizontal Air Handler Unit must be located so that if any
connections should leak, water will not cause damage to
the adjacent area.
When such locations can’t be avoided, a suitable drain pan
should be installed under the air handler, not over 1-1/2”
deep, with minimum length and width at least 2” greater
than the air handler dimensions and connected to an
adequate drain.
Under no circumstances is the manufacturer to be held
liable for any water damage in connection with this
horizontal Air Handle
r
unit.
Toxic chemicals used for treatment of boilers or non-
potable water heating appliances shall 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 scald hazard potential.
Hot water from a boiler used to satisfy heating requirements
can be heated to temperatures of 180°F. Parts containing
water this hot can scald very quickly. Use extreme caution
when servicing or performing maintenance on any parts
containing hot water.

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
Figure 17: Components and Water Connections
Chilled Water Piping:
Supply and return chilled water piping to the coil should be ¾ inch ID up to 42,000 BTU’s, 1 inch on units greater than 42,000 BTU’s.
Water piping must always be connected so that the entering water is on the leaving side of the coil.
Total Sensible Total Sensible
14,700 12,900 15,800 13,400 2.0 1.2
18,100 14,600 19,700 15,300 3.0 2.6
20,600 15,800 22,700 16,600 4.0 4.4
22,600 16,700 25,000 17,600 5.0 6.8
24,200 17,300 26,822 18,400 6.0 9.6
17,900 14,500 19,400 15,000 2.0 2.1
21,500 16,000 23,500 16,900 3.0 4.6
24,100 17,100 26,600 18,200 4.0 7.9
26,000 17,900 28,800 19,100 5.0 12.0
27,400 18,500 30,400 19,900 6.0 17.0
16,400 15,000 17,500 15,800 2.0 1.2
20,400 17,500 22,100 18,300 3.0 2.6
23,500 19,000 26,000 20,000 4.0 4.4
25,800 20,100 28,300 21,200 5.0 6.8
27,700 21,000 30,600 22,200 6.0 9.7
20,300 17,200 21,800 18,000 2.0 2.1
24,700 19,500 26,750 20,400 3.0 4.6
27,800 20,900 30,500 22,000 4.0 7.9
30,300 22,000 33,300 23,300 5.0 12.0
32,100 22,800 35,600 24,300 6.0 17.0
19,500 17,800 20,800 18,700 2.0 1.3
24,500 21,200 26,500 22,200 3.0 2.8
28,300 23,200 30,700 24,300 4.0 4.9
31,200 24,600 31,190 25,900 5.0 7.5
33,800 25,700 37,000 27,200 6.0 10.6
24,300 20,500 25,800 21,400 2.0 2.4
29,600 23,600 31,800 24,700 3.0 5.2
33,500 25,500 36,300 26,800 4.0 9.0
36,500 26,900 40,000 28,400 5.0 13.6
38,800 27,900 42,900 29,700 6.0 19.2
20,900 19,100 22,400 20,100 2.0 1.4
26,500 22,900 28,500 24,100 3.0 3.0
30,500 25,200 33,100 26,400 4.0 5.1
33,800 26,800 37,000 28,200 5.0 7.8
36,400 28,000 40,000 29,600 6.0 11.1
26,100 21,900 27,700 22,900 2.0 2.6
31,900 25,600 34,200 26,700 3.0 5.6
36,100 27,700 39,200 29,100 4.0 9.5
39,400 29,200 43,100 30,800 5.0 14.4
42,000 30,300 46,300 32,200 6.0 20.3
22,300 19,900 23,700 20,900 2.0 1.5
28,000 23,800 30,200 24,900 3.0 3.2
32,300 26,100 35,100 27,300 4.0 5.6
35,800 27,800 39,100 29,200 5.0 8.5
38,600 29,100 42,350 30,700 6.0 12.0
27,400 22,600 29,100 23,600 2.0 2.9
33,400 26,300 35,900 27,500 3.0 6.1
37,800 28,600 41,000 29,950 4.0 10.4
41,300 30,100 45,200 31,800 5.0 15.9
43,850 31,200 48,500 33,250 6.0 22.3
PSC
PSC
PSC
PSC
PSC
PSC
PSC
PSC
PSC
Pressure
Drop Water
(Ft Water)
Pressure
Drop Air
(INWC)
Evaporator
Coil Number of
Rows
SCWE/CCWE
18-XX-24-OC79 4 600 0.29
Type
Of
Blower
Motor
PSC
SCWE/CCWE
19-XX-25-OC79 5
SCWE/CCWE
24-XX-24-OC79 4
5
SCWE/CCWE
25-XX-25-OC65
SCWE/CCWE
30-XX-24-OC65 4
SCWE/CCWE
31-XX-25-OC65 5
SCWE/CCWE
34-XX-24-OC65 4
SCWE/CCWE
35-XX-25-OC65 5
SCWE/CCWE
36-XX-24-OC65 4
SCWE/CCWE
37-XX-25-OC65 5
0.41
0.52
600 0.35
800
800
1,000
1,000
0.31
0.40
Model Number CFM GPM
Chilled Water Capacities @ Entering
Water Temperatures
80°F / 67°F / 45°F80
°
F / 67
°
F / 42
°
F
1,200
1,200
1,200
1,200
0.44
0.55
0.40
0.53
Table 14: SCWW/CCWW Chilled Water Capacity with 4 and 5 row Chilled Water Coil on 208/240 VAC with or without Electric
Heat - PSC Blower Motor - 18-37 BTU/H Models

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Total Sensible Total Sensible
14,700 12,900 15,800 13,400 2.0 1.2
18,100 14,600 19,700 15,300 3.0 2.6
20,600 15,800 22,700 16,600 4.0 4.4
22,600 16,700 25,000 17,600 5.0 6.8
24,200 17,300 26,822 18,400 6.0 9.6
17,900 14,500 19,400 15,000 2.0 2.1
21,500 16,000 23,500 16,900 3.0 4.6
24,100 17,100 26,600 18,200 4.0 7.9
26,000 17,900 28,800 19,100 5.0 12.0
27,400 18,500 30,400 19,900 6.0 17.0
16,400 15,000 17,500 15,800 2.0 1.2
20,400 17,500 22,100 18,300 3.0 2.6
23,500 19,000 26,000 20,000 4.0 4.4
25,800 20,100 28,300 21,200 5.0 6.8
27,700 21,000 30,600 22,200 6.0 9.7
20,300 17,200 21,800 18,000 2.0 2.1
24,700 19,500 26,750 20,400 3.0 4.6
27,800 20,900 30,500 22,000 4.0 7.9
30,300 22,000 33,300 23,300 5.0 12.0
32,100 22,800 35,600 24,300 6.0 17.0
19,500 17,800 20,800 18,700 2.0 1.3
24,500 21,200 26,500 22,200 3.0 2.8
28,300 23,200 30,700 24,300 4.0 4.9
31,200 24,600 31,190 25,900 5.0 7.5
33,800 25,700 37,000 27,200 6.0 10.6
24,300 20,500 25,800 21,400 2.0 2.4
29,600 23,600 31,800 24,700 3.0 5.2
33,500 25,500 36,300 26,800 4.0 9.0
36,500 26,900 40,000 28,400 5.0 13.6
38,800 27,900 42,900 29,700 6.0 19.2
20,900 19,100 22,400 20,100 2.0 1.4
26,500 22,900 28,500 24,100 3.0 3.0
30,500 25,200 33,100 26,400 4.0 5.1
33,800 26,800 37,000 28,200 5.0 7.8
36,400 28,000 40,000 29,600 6.0 11.1
26,100 21,900 27,700 22,900 2.0 2.6
31,900 25,600 34,200 26,700 3.0 5.6
36,100 27,700 39,200 29,100 4.0 9.5
39,400 29,200 43,100 30,800 5.0 14.4
42,000 30,300 46,300 32,200 6.0 20.3
22,300 19,900 23,700 20,900 2.0 1.5
28,000 23,800 30,200 24,900 3.0 3.2
32,300 26,100 35,100 27,300 4.0 5.6
35,800 27,800 39,100 29,200 5.0 8.5
38,600 29,100 42,350 30,700 6.0 12.0
27,400 22,600 29,100 23,600 2.0 2.9
33,400 26,300 35,900 27,500 3.0 6.1
37,800 28,600 41,000 29,950 4.0 10.4
41,300 30,100 45,200 31,800 5.0 15.9
43,850 31,200 48,500 33,250 6.0 22.3
0.31
0.40
Model Number CFM GPM
Chilled Water Capacities @ Entering
Water Temperatures
80°F / 67°F / 45°F80
°
F / 67
°
F / 42
°
F
1,200
1,200
1,200
1,200
0.44
0.55
0.40
0.53
0.41
0.52
600 0.35
800
800
1,000
1,000
SCWE/CCWE
35-XX-25-OC81 5
SCWE/CCWE
36-XX-24-OC81 4
SCWE/CCWE
37-XX-25-OC81 5
SCWE/CCWE
30-XX-24-OC81 4
SCWE/CCWE
31-XX-25-OC81 5
SCWE/CCWE
34-XX-24-OC81 4
SCWE/CCWE
19-XX-25-OC80 5
SCWE/CCWE
24-XX-24-OC80 4
5
SCWE/CCWE
25-XX-25-OC81
Pressure
Drop Water
(Ft Water)
Pressure
Drop Air
(INWC)
Evaporator
Coil Number of
Rows
SCWE/CCWE
18-XX-24-OC80 4 600 0.29
Type
Of
Blower
Motor
C.T.
C.T.
C.T.
C.T.
C.T.
C.T.
C.T.
C.T.
C.T.
C.T.
Table 15: SCWW/CCWW Chilled Water Capacity with 4 and 5 row Chilled Water Coil on 208/240 VAC with or without Electric
Heat - Constant Torque Blower Motor - 18-37 BTU/H Models

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140°F160°F 170
°
F180
°
F
33,998 41,000 45,400 49,850 2.0 1.2
38,103 46,000 50,900 55,870 3.0 2.6
39,658 48,785 53,900 58,150 4.0 4.4
41,718 50,400 55,790 61,170 5.0 6.8
42,639 51,500 57,000 62,520 6.0 9.6
36,801 44,420 49,200 53,960 2.0 2.1
41,108 49,690 54,980 60,275 3.0 4.6
43,307 52,370 57,935 63,500 4.0 7.9
44,596 53,945 59,660 65,390 5.0 9.1
45,428 54,950 60,780 66,610 6.0 12.9
39,154 47,200 52,300 57,410 2.0 1.2
45,193 54,510 60,380 66,265 3.0 2.6
48,695 58,765 65,080 71,400 4.0 4.4
50,945 61,510 68,100 74,700 5.0 6.8
52,494 63,400 70,190 76,970 6.0 9.7
42,645 51,515 57,025 62,530 2.0 2.1
49,288 59,550 65,910 72,270 3.0 4.6
52,974 64,020 70,845 77,675 4.0 7.9
55,249 66,740 73,900 81,010 5.0 9.1
56,766 68,640 75,940 83,235 6.0 12.9
45,183 54,530 60,390 66,250 2.0 1.3
53,517 64,600 71,530 78,470 3.0 2.8
58,509 70,640 78,210 85,790 4.0 4.9
61,769 74,600 82,580 90,570 5.0 7.5
64,036 77,365 85,630 93,895 6.0 10.6
48,695 58,880 65,140 71,400 2.0 2.4
58,048 70,170 77,640 85,115 3.0 5.2
63,494 76,750 84,910 93,100 4.0 9.0
66,904 80,900 89,501 98,100 5.0 13.6
69,216 83,715 92,600 101,490 6.0 14.4
49,281 59,500 65,880 72,260 2.0 1.4
59,617 72,020 79,745 87,415 3.0 3.0
66,120 79,835 88,390 96,950 4.0 5.1
70,437 85,075 94,175 103,280 5.0 7.8
73,492 88,785 98,270 107,760 6.0 11.1
52,804 63,880 70,660 77,425 2.0 2.6
64,592 78,100 86,410 94,710 3.0 5.6
71,787 86,800 96,030 105,260 4.0 9.5
76,466 92,470 102,300 112,120 5.0 11.4
79,692 96,380 106,615 116,850 6.0 16.0
50,563 61,100 67,620 74,140 2.0 1.0
61,448 74,220 82,150 90,100 3.0 2.2
68,173 82,370 91,160 99,960 4.0 3.9
72,633 87,780 97,140 106,500 5.0 5.6
75,770 91,585 101,340 111,100 6.0 7.9
53,731 65,045 71,920 78,785 2.0 2.4
66,031 79,890 88,350 96,820 3.0 4.9
73,506 88,925 98,350 107,780 4.0 8.4
78,324 94,760 104,800 114,845 5.0 12.6
81,612 98,740 109,200 119,665 6.0 16.6
Pressure
Drop Water
(Ft Water)
Pressure
Drop Air
(INWC)
Evaporator
Coil Number of
Rows
SCWE/CCWE
18-XX-24-
OC79 4 600 0.29
Type Of
Blower
Motor
PSC
SCWE/CCWE
19-XX-25-
OC79 5
SCWE/CCWE
24-XX-24-
OC79 4
5
SCWE/CCWE
25-XX-25-
OC65
SCWE/CCWE
30-XX-24-
OC65 4
SCWE/CCWE
31-XX-25-
OC65 5
SCWE/CCWE
34-XX-24-
OC65 4
SCWE/CCWE
35-XX-25-
OC65 5
SCWE/CCWE
36-XX-24-
OC65 4
SCWE/CCWE
37-XX-25-
OC65 5
0.52
600 0.35
800
1,000
1,000
1,000
0.31
0.40
Hot Water Capacities @ 65
°
F
Entering Water Temperature
Model Number CFM GPM
1,200
1,200
1,200
1,200
0.44
0.55
0.40
0.53
0.41PSC
PSC
PSC
PSC
PSC
PSC
PSC
PSC
PSC
Table 16: SCWE/CCWE Hot Water Capacity Using 4 and 5 Row Chilled Water Coil on 208/240 VAC Electric Heat with a PSC
Blower Motor - 18-37 BTU/H Models
This model is capable of using the chilled water coil for hot water heat as well as chilled water cooling using a valve on the hot
water line and a valve on the chilled water line to isolate the hot water from the chilled water.
NOTE: You must never operate this air handler on hot water heat and electric heat at the same time.

MORTEXPRODUCTSINC.501TERMINALRDFORTWORTH,TEXAS76106Page19
140°F 160°F170
°
F180
°
F
33,998 41,000 45,400 49,850 2.0 1.2
38,103 46,000 50,900 55,870 3.0 2.6
39,658 48,785 53,900 58,150 4.0 4.4
41,718 50,400 55,790 61,170 5.0 6.8
42,639 51,500 57,000 62,520 6.0 9.6
36,801 44,420 49,200 53,960 2.0 2.1
41,108 49,690 54,980 60,275 3.0 4.6
43,307 52,370 57,935 63,500 4.0 7.9
44,596 53,945 59,660 65,390 5.0 9.1
45,428 54,950 60,780 66,610 6.0 12.9
39,154 47,200 52,300 57,410 2.0 1.2
45,193 54,510 60,380 66,265 3.0 2.6
48,695 58,765 65,080 71,400 4.0 4.4
50,945 61,510 68,100 74,700 5.0 6.8
52,494 63,400 70,190 76,970 6.0 9.7
42,645 51,515 57,025 62,530 2.0 2.1
49,288 59,550 65,910 72,270 3.0 4.6
52,974 64,020 70,845 77,675 4.0 7.9
55,249 66,740 73,900 81,010 5.0 9.1
56,766 68,640 75,940 83,235 6.0 12.9
45,183 54,530 60,390 66,250 2.0 1.3
53,517 64,600 71,530 78,470 3.0 2.8
58,509 70,640 78,210 85,790 4.0 4.9
61,769 74,600 82,580 90,570 5.0 7.5
64,036 77,365 85,630 93,895 6.0 10.6
48,695 58,880 65,140 71,400 2.0 2.4
58,048 70,170 77,640 85,115 3.0 5.2
63,494 76,750 84,910 93,100 4.0 9.0
66,904 80,900 89,501 98,100 5.0 13.6
69,216 83,715 92,600 101,490 6.0 14.4
49,281 59,500 65,880 72,260 2.0 1.4
59,617 72,020 79,745 87,415 3.0 3.0
66,120 79,835 88,390 96,950 4.0 5.1
70,437 85,075 94,175 103,280 5.0 7.8
73,492 88,785 98,270 107,760 6.0 11.1
52,804 63,880 70,660 77,425 2.0 2.6
64,592 78,100 86,410 94,710 3.0 5.6
71,787 86,800 96,030 105,260 4.0 9.5
76,466 92,470 102,300 112,120 5.0 11.4
79,692 96,380 106,615 116,850 6.0 16.0
50,563 61,100 67,620 74,140 2.0 1.0
61,448 74,220 82,150 90,100 3.0 2.2
68,173 82,370 91,160 99,960 4.0 3.9
72,633 87,780 97,140 106,500 5.0 5.6
75,770 91,585 101,340 111,100 6.0 7.9
53,731 65,045 71,920 78,785 2.0 2.4
66,031 79,890 88,350 96,820 3.0 4.9
73,506 88,925 98,350 107,780 4.0 8.4
78,324 94,760 104,800 114,845 5.0 12.6
81,612 98,740 109,200 119,665 6.0 16.6
Pressure
Drop Water
(Ft Water)
Pressure
Drop Air
(INWC)
Evaporator
Coil Number of
Rows
SCWE/CCWE
18-XX-24-
OC80 4 600 0.29
Type Of
Blower
Motor
C.T.
SCWE/CCWE
19-XX-25-
OC80 5
SCWE/CCWE
24-XX-24-
OC80 4
5
SCWE/CCWE
25-XX-25-
OC81
SCWE/CCWE
30-XX-24-
OC81 4
SCWE/CCWE
31-XX-25-
OC81 5
SCWE/CCWE
34-XX-24-
OC81 4
SCWE/CCWE
35-XX-25-
OC81 5
SCWE/CCWE
36-XX-24-
OC81 4
SCWE/CCWE
37-XX-25-
OC81 5
0.52
600 0.35
800
1,000
1,000
1,000
0.31
0.40
Hot Water Capacities @ 65
°
F
Entering Water Temperature
Model Number CFM GPM
1,200
1,200
1,200
1,200
0.44
0.55
0.40
0.53
0.41C.T.
C.T.
C.T.
C.T.
C.T.
C.T.
C.T.
C.T.
C.T.
Table 17: SCWE/CCWE Hot Water Capacity Using Two 4 and 5 Row Chilled Water Coil on 208/240 VAC Electric Heat with a
Constant Torque Blower Motor - 18-37 BTU/H Models
This model is capable of using the chilled water coil for hot water heat as well as chilled water cooling using a valve on the hot
water line and a valve on the chilled water line to isolate the hot water from the chilled water.
NOTE: You must never operate this air handler on hot water heat and electric heat at the same time.

MORTEXPRODUCTSINC.501TERMINALRDFORTWORTH,TEXAS76106Page20
Total Sensible Total Sensible
14,700 12,900 15,800 13,400 2.0 1.2
18,100 14,600 19,700 15,300 3.0 2.6
20,600 15,800 22,700 16,600 4.0 4.4
22,600 16,700 25,000 17,600 5.0 6.8
24,200 17,300 26,822 18,400 6.0 9.6
17,900 14,500 19,400 15,000 2.0 2.1
21,500 16,000 23,500 16,900 3.0 4.6
24,100 17,100 26,600 18,200 4.0 7.9
26,000 17,900 28,800 19,100 5.0 12.0
27,400 18,500 30,400 19,900 6.0 17.0
16,400 15,000 17,500 15,800 2.0 1.2
20,400 17,500 22,100 18,300 3.0 2.6
23,500 19,000 26,000 20,000 4.0 4.4
25,800 20,100 28,300 21,200 5.0 6.8
27,700 21,000 30,600 22,200 6.0 9.7
20,300 17,200 21,800 18,000 2.0 2.1
24,700 19,500 26,750 20,400 3.0 4.6
27,800 20,900 30,500 22,000 4.0 7.9
30,300 22,000 33,300 23,300 5.0 12.0
32,100 22,800 35,600 24,300 6.0 17.0
19,500 17,800 20,800 18,700 2.0 1.3
24,500 21,200 26,500 22,200 3.0 2.8
28,300 23,200 30,700 24,300 4.0 4.9
31,200 24,600 31,190 25,900 5.0 7.5
33,800 25,700 37,000 27,200 6.0 10.6
24,300 20,500 25,800 21,400 2.0 2.4
29,600 23,600 31,800 24,700 3.0 5.2
33,500 25,500 36,300 26,800 4.0 9.0
36,500 26,900 40,000 28,400 5.0 13.6
38,800 27,900 42,900 29,700 6.0 19.2
20,900 19,100 22,400 20,100 2.0 1.4
26,500 22,900 28,500 24,100 3.0 3.0
30,500 25,200 33,100 26,400 4.0 5.1
33,800 26,800 37,000 28,200 5.0 7.8
36,400 28,000 40,000 29,600 6.0 11.1
26,100 21,900 27,700 22,900 2.0 2.6
31,900 25,600 34,200 26,700 3.0 5.6
36,100 27,700 39,200 29,100 4.0 9.5
39,400 29,200 43,100 30,800 5.0 14.4
42,000 30,300 46,300 32,200 6.0 20.3
22,300 19,900 23,700 20,900 2.0 1.5
28,000 23,800 30,200 24,900 3.0 3.2
32,300 26,100 35,100 27,300 4.0 5.6
35,800 27,800 39,100 29,200 5.0 8.5
38,600 29,100 42,350 30,700 6.0 12.0
27,400 22,600 29,100 23,600 2.0 2.9
33,400 26,300 35,900 27,500 3.0 6.1
37,800 28,600 41,000 29,950 4.0 10.4
41,300 30,100 45,200 31,800 5.0 15.9
43,850 31,200 48,500 33,250 6.0 22.3
PSC
PSC
PSC
PSC
PSC
PSC
PSC
PSC
PSC
Pressure
Drop Water
(Ft Water)
Pressure
Drop Air
(INWC)
Evaporator
Coil Number
of Rows
SCWW/CCWW
18-21-44-OA78 4 600 0.29
Blower
Motor
Type
PSC
SCWW/CCWW
19-22-45-OA78 5
SCWW/CCWW
24-23-44-OA78 4
5
SCWW/CCWW
25-25-45-OA70
SCWW/CCWW
30-27-44-OA70 4
SCWW/CCWW
31-28-55-OA70 5
SCWW/CCWW
34-30-44-OA70 4
SCWW/CCWW
35-30-45-OA70 5
SCWW/CCWW
36-32-44-OA70 4
SCWW/CCWW
37-323-45-
OA70 5
0.41
0.52
600 0.35
800
800
1,000
1,000
0.31
0.40
Model Number CFM GPM
Chilled Water Capacities @ Entering
Water Temperatures
80°F / 67°F / 45°F80
°
F / 67
°
F / 42
°
F
1,200
1,200
1,200
1,200
0.44
0.55
0.40
0.53
Table 18: SCWW/CCWW Chilled Water Capacity Using 4 and 5 Row Chilled Water Coil – on 120 VAC - PSC Blower Motor -
18-37 BTU/H Models