Table of Contents
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Horizontal Air Handler Models:
SEHX - DX Cooling w/ Electric Heat, Uncased
CEHX - DX Cooling w/ Electric Heat, Cased
SCWE - Chilled Water Cooling w/Electric Heat, Uncased-2P
CCWE - Chilled Water Cooling w/Electric Heat, Cased-2P
1 - General ............................................................................................................................1
2 - Safety, General, Dimensional & Model Number Nomenclature ................2
3 - Location and Clearances. ..........................................................................................6
4 - Return and Supply Air Requirements ..................................................................7
5 - Air Handler Installation..............................................................................................8
6 - Refrigerant Piping, TXV, Flowrator & Condensate Drain ........................... 10
7 - Hot Water and Chilled Water ........................................................................................ 14
1 - CEHX/CCWE Dimensions ........................................................................................4
2 - SEHX/SCWE Dimensions .........................................................................................5
3 - Clearance For Service Access ................................................................................7
5 - Return & Supply Duct Transitions ........................................................................8
6 - Cased Air Handler Mounting ................................................................................9
7 - Piping for Air Handler Below Outdoor Unit ................................................. 10
8 - TXV Sensing Bulb Placement ............................................................................. 10
9 - TXV Sensing Bulb Location ................................................................................. 10
10 - Typical TXV Connections ................................................................................... 12
11 - Flowrator Distributor Assembly ....................................................................... 13
12 - SHL Temperature Sensor Location ................................................................. 13
13 - SHL Temperature Sensor Mounting ............................................................... 13
14 - SHL Temperature Switch Wiring ...................................................................... 13
15 - Typical Condensate Trap..................................................................................... 14
16 - Condensate Drain Pan ......................................................................................... 14
1 - CEHX/CCWE/CDXW/CCWW Dimensional Data ..............................................4
2 - SEHX/SCWE/SDXW/SCWW Dimensional Data................................................5
3 - SEHX/CEHX/SCWE/CCWE Model Nomenclature ...........................................6
4 - Clearance to Combustibles ....................................................................................6
5 - Optional Ceiling Access Panels .............................................................................8
6 - SCWW/CCWW Chilled Water Capacity 4&5 Row Coil - C.T .................... 16
7 - SCWE/CCWE Hot Water Capacity 4&5 Row Coil - C.T ............................... 17
8 - SCWW/CCWW Chilled Water Capacity 4&5 Row Coil - C.T .................... 18
9 - SCWW/CCWW Hot Water Capacity 4 & 5 Row Coil - C.T ......................... 19
10 - SCWW/CCWW Hot Water Capacity 2 Row HW Coil - C.T ........................ 20
11 - SDXW/CDXW Hot Water Capacity 2 Row HW Coil - C.T .......................... 20
1. This air handler is rated at 208/240 VAC (electric heat) or 115 VAC
(hydronic heat), 60 Hertz, Single-Phase
2. This air handler is not designed to operate at 50 Hertz.
3. Air handler size varies by model.
4. This air handler is designed for both A/C and heat pump applications
5. Use 4-wire thermostat cable for heating/cooling
applications and 7-wire thermostat cable for heat pump applications.
6. This air handler is designed for horizontal applications only.
7. This air handler must not be operated without the access
panels installed.
MORTEX PRODUCTS INC.
501 TERMINAL RD FORT WORTH, TX 76106
INSTALLATION MANUAL
The following list includes important facts and information regarding this air handler.
SDXW - DX Cooling w/ Hot Water Heat, Uncased
CDXW - DX Cooling w/ Hot Water Heat, Cased
SCWW - Chilled Water Cooling w/Hot Water Heat, Uncased-4P
CCWW - Chilled Water Cooling w/Hot Water Heat, Cased-4P
LIST OF SECTIONS
8 - Line Voltage Wiring ................................................................................................21
9 - Thermostat Wiring and Connections ..............................................................23
10 - Blower Performance .............................................................................................28
11 - Blower Motor Speed Selection .........................................................................30
12 - Final System Checkout and Startup ................................................................31
13 - Wiring Diagrams .....................................................................................................30
LIST OF FIGURES
17 - Components and Water Connections ............................................................15
18 - Proper Wiring of the SHL Temperature Switch ............................................23
19 - Component Locations - No Heat Control Box ........................................... 23
20 - Component Locations - Hydronic Heat Control Box ................................ 23
21 - Heat/Cool Tstat Connections - Separate Tstats & Single Tfmr ................24
23 - Heat/Cool Tstat Connections - Single Tstat & Separate Tfmrs ................25
24 - Heat/Cool Tstat Connections - Single Tstat & Single Tfmr .......................25
25 - Heat Pump Tstat Connections - Single Tstat & Single Tfmr .....................25
26 - Constant Torque Motor Control Module Terminals ..................................30
27 - Constant Torque Blower Assembly .................................................................30
28 - Wiring Diagram - No Heat; C.T. Motor ............................................................30
29 - Wiring Diagram 3kW-10kW Electric Ht; C.T. Motor w/ Lockout .............32
30 - Wiring Diagram Hydronic Heat; C.T. Motor; No Water Pump .................33
31 - Wiring Diagram Hydronic Heat; C.T. Motor and Water Pump ................33
LIST OF TABLES
12 - Electrical Data - Electric and Hot Water Heat ............................................ 22
13 - Electric Heater Heating Capacity .................................................................... 22
14 - Low Voltage Wire Gauge and Maximum Lengths ..................................... 23
15 - Thermostat Terminal Designations ................................................................. 25
16 - Air Handler Low Voltage Pigtail Wire Colors & Connections ................. 26
17 - Typical Heating/Cooling Tstat Wire Colors & Connections..................... 26
18 - Typical Heat Pump Tstat Wire Colors & Connections ............................... 26
19 - 28 - Blower Performance ..............................................................................28-29
29 - Constant Torque Motor Terminals - Electric Heat Models ...................... 30
30 - Constant Torque Motor Terminals - Hydronic Heat Models .................. 30
SECTION 1: GENERAL
8. This air handler and its components listed are listed by ETL for the
United States and Canada.
9. This air handler is for use at elevations of 10,000 ft (3,048m) or less.
10. This appliance is not to be used by persons (including children) with
reduced physical, sensory or mental capabilities, or lack of experience
and knowledge, unless they have been given supervision or instruction
concerning use of this appliance by a person responsible for their safety.
9700771
Page 1
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Table of Contents
Related Manuals for Suntherm SEHX Series
Summary of Contents for Suntherm SEHX Series
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Page 1: Table Of Contents
INSTALLATION MANUAL Horizontal Air Handler Models: 9700771 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 –... -
Page 2: Safety, General, Dimensional & Model Number Nomenclature
NOTE: All applicable codes take precedence over any if not avoided, could result in death or serious injury. recommendation made in these instructions. SunTherm assumes no responsibility for units installed in violation of any CAUTION: Indicates a potentially hazardous situation, which code or regulation. - Page 3 12. 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 ALWAYS SHUT OFF ELECTRICITY AT THE DISCONNECT construction practices.
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Page 4: Cehx/Ccwe Dimensions
Figure 1: CEHX/ CCWE/ CDXW/ CCWW Dimensions - DX or Chilled Water Cooling With or Without Electric Heat Model Number Physical Dimensions CEHX / CCWE / CDXW / CCWW - 18 2.625 7.125 5.25 2.625 3.75 CEHX / CCWE / CDXW / CCWW - 19 2.625 7.125 5.25... -
Page 5: Sehx/Scwe Dimensions
Figure 2: SEHX/ SCWE/ SDXW/ SCWW Dimensions - DX or Chilled Water Cooling With or Without Electric Heat Model Number Physical Dimensions Liquid Line Suction Evap. Rows Ship Line Weight SEHX / SCWE / SDXW / SCWW - 18 34.25 SEHX / SCWE / SDXW / SCWW - 19 34.25 SEHX / SCWE / SDXW / SCWW - 24... -
Page 6: Location And Clearances
SERIEC S - Horizontal Firdown Unit Uncased C - Horizontal Firdown Unit Cased TYPE EHX - DX Coil and Electric 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... -
Page 7: Return And Supply Air Requirements
SECTION 4: RETURN AND SUPPLY AIR REQUIREMENTS RETURN AIR REQUIREMENTS Provisions shall be made to permit air in the conditioned space to FIRE HAZARD: return to the air handler. Failure to provide means for adequate NON-METALIC DUCTS CAN COLLECT DUST AND DEBRIS return air will result in reduced airflow through the air handler WHICH CAN RESULT IN A FIRE HAZARD. -
Page 8: Air Handler Installation
Part Overall Type SunTherm Horizontal Fan Coil Models Ship Number Frame Weight Dimensions USING A DUCTED RETURN WILL RESULT IN QUIETER CPL1 27.5 x 43 Louvered SCWE/CCWE/SDXW/CDXW/CCWW-12, SCWE/CCWE/SDXW/CDXW/CCWW-18 OPERATION THAN USING A LOUVERED CEILING ACCESS SCWE/CCWE/SDXW/CDXW/CCWW-19, CPNL1 27.5 x 43 Non-Louvered PANEL USED FOR RETURN AIR. -
Page 9: Cased Air Handler Mounting
Cased Air Handler 11. Make the necessary blower motor speed changes as described in SECTION 10 of these instructions. The following steps are required to properly install a cased air handler. 12. Install the control box cover. 1. Remove the top shipping cover and corner posts. 13. -
Page 10: Refrigerant Piping, Txv, Flowrator & Condensate Drain
A TXV has a thermostatic element separated from the valve body SECTION 6: REFRIGERANT PIPING, TXV, by a diaphragm designed to regulate the rate at which refrigerant FLOWRATOR, CONDENSATE DRAIN flows into the evaporator. DX Cooling / Chilled Water Cooling DX Refrigerant Piping: Air handlers with DX type evaporator coils require liquid and suction piping sized in accordance with the outdoor unit... - Page 11 which liquid refrigerant flows into the evaporator. This controlled Additional TXV Troubleshooting Information flow is necessary to provide optimum performance and to Low Suction Pressure – High Superheat prevent the return of liquid refrigerant to the compressor. POSSIBLE CAUSES: The TXV separates the high pressure and low-pressure sides of a 1.
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Page 12: Typical Txv Connections
be installed before system is charged with refrigerant. Installation of the TXV requires no cutting or brazing. IMPORTANT NOTE: The flowrator piston must be removed from the flowrator distributor prior to the installation of the TXV (See Figure 11). Field Installed TXV Kit Information R72DB0053HX: R-410A, 1.5 –... -
Page 13: Flowrator Distributor Assembly
Figure 12: Supplemental Heat Lockout (SHL) Figure 11: Flowrator Distributor Assembly Temperature Sensor Location FIELD INSTALLED SUPPLEMENTAL HEAT LOCKOUT (SHL) KIT A field installed supplemental heat lockout (SHL) kit must be used with SEHX and CEHX models equipped with electric heat when used in a heat pump system. -
Page 14: Hot Water And Chilled Water
CONDENSATE DRAIN PIPING The blow-through coil design of this air handler will create positive pressure in the condensate drain system. To prevent air from being blown out of the condensate drain, it is recommended This air handler must not be located where water can cause that a trap with an anti-siphon air vent be installed as shown in damage to the adjacent area if the condensate drain pan Figure 15. -
Page 15: Components And Water Connections
The air handler must not be located where water will cause When system requires water at temperatures higher damage to the adjacent area should any water connection leak. than required for other uses, a means such as a mixing valve must be installed to temper the water temperature When such locations can’t be avoided, a suitable auxiliary for those uses in order to reduce the potential of a scald drain pan must be installed under the air handler and... -
Page 16: Scww/Ccww Chilled Water Capacity 4&5 Row Coil - C.t
Model Number Evaporator Type Chilled Water Capacities @ Entering Pressure Pressure Coil Number Water Temperatures Drop Water Drop Air of Rows Blower ( Ft Water ) ( IN WC ) 80° F/67° F/45° F 80° F/67 ° F/42° F Motor Total Sensible Total... -
Page 17: Scwe/Ccwe Hot Water Capacity 4&5 Row Coil - C.t
Model Number Evaporator Type Chilled Water Capacities @ Entering Pressure Pressure Coil Number Water Temperatures Drop Water Drop Air of Rows Blower ( Ft Water ) ( IN WC ) 80° F/67° F/45° F 80° F/67 ° F/42° F Motor Total Sensible Total... -
Page 18: Scww/Ccww Chilled Water Capacity 4&5 Row Coil - C.t
Model Number Evaporator Type Of Hot Water Capacities @ 65 °F Pressure Pressure Coil Number Blower Entering Model Number Water Tempera- Drop Water Drop Air of Rows Motor ture ( Ft Water ) ( IN WC ) 140°F 160°F 170°F 180°... -
Page 19: Scww/Ccww Hot Water Capacity 4 & 5 Row Coil - C.t
Model Number Evaporator Type Of Hot Water Capacities @ 65 °F Pressure Pressure Coil Number Blower Entering Model Number Water Tempera- Drop Water Drop Air of Rows Motor ture ( Ft Water ) ( IN WC ) 140°F 160°F 170°F 180°... -
Page 20: Scww/Ccww Hot Water Capacity 2 Row Hw Coil - C.t
Model Number Coil Type Of Heating Capacities Heating Rows Blower Entering Water Temperature Max. Motor Fuse 130°F 140°F 150°F 160° F 170° F 180° F SCWW/CCWW-18-21-0A-0A78 18,000 21,000 24,200 27,300 30,500 33,600 SCWW/CCWW-19-22-0E-0A78 19,200 22,500 25,800 29,100 32,400 35,800 SCWW/CCWW-23-21-09-0A78 19,300 22,700 26,000... -
Page 21: Line Voltage Wiring
SECTION 8: LINE VOLTAGE WIRING Power Supply Wiring 1. Remove the thumb screws that secure ceiling access General wire and breaker sizes are shown in Tables 26-29. If panel and slowly swing the panel down to access the sheathed cable is used, refer to NEC National Electrical Code air handler. -
Page 22: Electrical Data - Electric And Hot Water Heat
ELECTRICAL DATA - ELECTRIC HEAT Electric Heater Data Total Load Minimum Circuit Ampacity Maximum Overcurrent Protection Short-Circuit Current Rating Motor Motor Furnace Motor Motor Volts Motor Amps Amps Amps Amps Amps MOCP MOCP MOCP MOCP MOCP Amps Amps Amps Amps “SCCR”... -
Page 23: Thermostat Wiring And Connections
Figure 18: Component Locations – Electric Heat Control Box Figure 19: Component Locations – No Heat Control Box A five conductor cable from the thermostat to the air handler and a two or three conductor cable from the air handler to the outdoor unit is recommended for typical heating/cooling applications. -
Page 24: Heat/Cool Tstat Connections - Separate Tstats & Single Tfmr
Heat Thermostat Do not locate thermostat within three feet of any of the Interlock following items: Cool Switch 1 Supply air registers 24 VAC to Heating 2 Lights or heat lamps Furnace Trans Thermostat 3 Aquariums 4 Televisions, stereo, amplifiers, surround sound systems 5 Stoves or any cooking appliance 6 Refrigerator 24 VAC to... -
Page 25: Heat/Cool Tstat Connections - Single Tstat & Separate Tfmrs
24 VAC Common HEAT PUMP THERMOSTAT from Outdoor Unit Trans R W2 E 24 VAC 24 VAC Common from Furnace Trans 24 VAC 24 VAC Common 24 VAC Common from Furnace Trans from Outdoor Unit FAN COIL NOTE: Trans-Transformer Heat Pump Air Handler Outdoor Section Cooling Unit... -
Page 26: Air Handler Low Voltage Pigtail Wire Colors & Connections
WIRE COLOR DESCRIPTION LETTER CODE THERMOSTAT CONNECTION 24 VAC RED / R WHITE Heat (1st Stage Heat) WHT / W W or W 1 GREEN Indoor Fan GRN / G YELLOW 24 VAC Common (Electric Heat Models) YEL / C BROWN 24 VAC Common (Hydronic Heat Models) BRN / C... - Page 27 Typical Heat Pump Wiring Connections 10. Connect the BROWN (24 VAC common) wire from the 1. Open the ceiling access panel. thermostat to the air handler low voltage pigtail (YELLOW 2. Remove the control box cover. for electric heat; BROWN for hydronic heat) wire and to 3.
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Page 28: Blower Performance
SECTION 10: BLOWER PERORMANCE Blower Motor No. of Blower CFM@ CFM@ CFM@ CFM@ CFM@ CFM@ SEHX / CEHX / SCWE / CCWE 0.25” 0.10” 0.20” 0.30” 0.40” 0.50” Type Volts Blowers Wheel Size Rows W.C. W.C. W.C. W.C. W.C. W.C. 19-**-**-1C80 C. - Page 29 Blower Motor CFM@ CFM@ CFM@ CFM@ CFM@ CFM@ SDXW / CDXW / SCWW / No. of Blower 0.25” 0.10” 0.20” 0.30” 0.40” 0.50” CCWW Blowers Wheel Size Rows Type Volts W.C. W.C. W.C. W.C. W.C. W.C. 18-21-**-1A82 C.T. 7.00 x 8.00 19-21-**-1A82 C.T.
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Page 30: Blower Motor Speed Selection
SECTION 11: BLOWER MOTOR SPEED SELECTION TERMINAL CONNECTION Speed Tap Common - 24 VAC Common NOTICE: The factory blower motor speed tap settings are Supply Voltage - 115 VAC appropriate for most applications. Refer to Section 10: Ground Connection Blower Performance before changing the motor speed Supply Voltage - Neutral from the factory setting. -
Page 31: Final System Checkout And Startup
SECTION 12: FINAL SYSTEM CHECKOUT AND STARTUP 1. Refer to appropriate wiring diagram and recheck all wiring Filling Hydronic Heating System With Water, Purging Air From System, and System Startup connections. Ensure that all wiring connections are tight. 2. Check blower motor connectors to make sure they are not 1. -
Page 32: Wiring Diagrams
SECTION 13: WIRING DIAGRAMS Figure 28: SEHX, CEHX, SCWE, CCWE; 12 – 37 BTU/H; No Electric Heat; Constant Torque Blower Motor Figure 29: SEHX, CEHX, SCWE, CCWE; 12 – 37 BTU/H; 03kW - 10kW Electric Heat; Constant Torque Blower Motor; With Field Installed Electric Heat Lockout Switch MORTEX PRODUCTS INC. -
Page 33: Wiring Diagram Hydronic Heat; C.t. Motor; No Water Pump
Figure 30: SDXW, CDXW, SCWW, CCWW; 18 – 37 BTU/H; Hydronic Heat; Constant Torque Blower Motor; With Freeze Switch; No Water Pump Figure 31: SDXW, CDXW, SCWW, CCWW; 18 – 37 BTU/H; Hydronic Heat; Constant Torque Blower Motor; With Freeze Switch and Water Pump MORTEX PRODUCTS INC. - Page 34 Subject to change without notice 61BA0067F Copyright by Mortex Products Inc. 2023 Supersedes: 1BA0067E MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 34...
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