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Suntherm MSVT Series Installation Manual

Multi-position dx and chilled water-cooling with electric heating
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MODELS: MSVT Series With Single-Stage Cooling/Heat Pump Air-Flow
1 - General ...........................................................................................................1
2 - Safety ..............................................................................................................2
5 - Installing the Air Handler ...................................................................... 10
7 - Line Voltage Wiring .................................................................................12
3 - Clearance - Access for Service ...............................................................7
4 - Closet Clearances .......................................................................................7
8 - Combustible Floor Base Installation ....................................................9
9 - Indoor Coil Below Outdoor Unit Piping .......................................... 10
10 - Typical TXV Connections ...................................................................... 10
11 - TXV Sensing Bulb Location .................................................................. 11
12 - TXV Bulb Placement ............................................................................... 11
13 - Typical Condensate Trap....................................................................... 12
15 - Component Locations - No Heat Control Box ............................. 15
16 - Control Box Circuit Breaker Locations ............................................. 15
17 - Circuit Breaker Location on Front Panel ......................................... 15
18 - Cabinet Wiring Entrances ...............................................................................17
1 - Air Handler Model Specifications .........................................................3
2 - Air Handler Model Number Nomenclature.......................................4
5 - Clearances to Combustibles ...................................................................7
10 - Electric Heater Heating Capacities ................................................... 14
The following list includes important facts and information regarding the air handler models covered in this manual.
1. Air handler is rated for 208/240 VAC at 60 Hertz.
2. Air handler size varies by model.
3. Air handler is designed for A/C or heat pump operation.
4. Air handler is designed for upflow, downflow and
horizontal applications.
MORTEX PRODUCTS INC.
501 TERMINAL RD FORT WORTH, TX 76106
INSTALLATION MANUAL
Multi-Position DX and Chilled Water-Cooling with Electric Heating
MSVE Series With Single or Two-Stage Cooling/Heat Pump Air-Flow
SAVE THIS MANUAL FOR FUTURE REFERENCE
LIST OF SECTIONS
8 - Field Installed Electric Heater Kits .....................................................16
9 - Thermostat Wiring and Connections ..............................................17
10 - Blower Performance ..............................................................................21
12 - Final System Checkout ..........................................................................23
13 - Wiring Diagrams ......................................................................................24
LIST OF FIGURES
23 - Constant Torque Motor Terminals ..............................................................22
24 - ECM Control Board Layout .............................................................................22
25 - ECM Motor Control Plug Pin Positions .....................................................22
LIST OF TABLES
11 - Electric Heater Kit Model Numbers .................................................. 16
17 - Blower Performance - ECM Motors .................................................. 21
18 - Constant Torque Motor Terminal Connections ............................ 22
SECTION 1: GENERAL
5. Air handler must not be operated with the access
panels removed.
6. Air handler is listed by ETL in the United States and Canada.
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  • Page 1: Table Of Contents

    INSTALLATION MANUAL Multi-Position DX and Chilled Water-Cooling with Electric Heating MODELS: MSVT Series With Single-Stage Cooling/Heat Pump Air-Flow MSVE Series With Single or Two-Stage Cooling/Heat Pump Air-Flow LIST OF SECTIONS 1 – General ......................1 8 – Field Installed Electric Heater Kits .............16 2 –...

  • Page 2: Safety

    WARNING: Indicates a potentially hazardous situation, which if recommendation made in these instructions. not avoided, could result in death or serious injury. SunTherm assumes no responsibility for units installed in CAUTION: Indicates a potentially hazardous situation, which if violation of any code or regulation.

  • Page 3: Air Handler Model Specifications

    GENERAL INFORMATION service heating/cooling equipment. Untrained service personnel can perform basic maintenance functions such as This single piece air handler provides the flexibility for cleaning of exterior surfaces and replacing the air filters. installation in any upflow, downflow, or horizontal application. Observe all precautions in the manuals and on the attached The versatile models may be used with or without electric heat labels when working on this appliance.

  • Page 4: Air Handler Model Number Nomenclature

    MODEL NUMBER NOMENCLATURE 862T Series MS = Multi-Position Single-Piece Motor Type VT = Variable Constant Torque VE = Variable Speed ECM Unit Size (Capacity in MBTUH) 12 through 24 - Small Cabinet 25 through 36 - Medium Cabinet 37 through 72 - Large Cabinet OS = No Cooling Small Cabinet OM = No Cooling Medium Cabinet OL = No Cooling Large Cabinet...

  • Page 5: Dimensional Data Dx Cool With & Without Electric Heat

    Figure 1: Dimensional Data DX Cooling With Or Without Electric Heat DIMENSIONAL DATA MULTI-POSITION AIR HANDLER COOL ONLY OR ELECTRIC HEAT Model MS**18, 24 17.50 43.00 21.00 15.63 12.50 13.50 11.00 6.75 16.75 14.00 11.00 10.75 2.00 1.50 5.00 16.10 20.20 MS**25, 30, 36, 38, 46 21.00 48.00 21.00 19.00 12.50 14.50 13.00 6.75 20.00 17.00 12.75 10.30 2.30 4.35 5.00 19.90 20.80 MS**37, 42, 48, 60, 72...
  • Page 6 Figure 2: Dimensional Data Chilled Water With And Without Electric Heat DIMENSIONAL DATA MULTI-POSITION AIR HANDLER COOL ONLY OR ELECTRIC HEAT Model MS**18, 24 17.50 43.00 21.00 15.63 12.50 13.50 11.00 6.75 16.75 14.00 11.00 10.75 2.00 1.50 5.00 16.10 20.20 MS**25, 30, 36, 38, 46 21.00 48.00 21.00 19.00 12.50 14.50 13.00 6.75 20.00 17.00 12.75 10.30 2.30 4.35 5.00 19.90 20.80 MS**37, 42, 48, 60, 72...

  • Page 7: Location, Clearances And Return Air Requirements

    SECTION 3: LOCATION, CLEARANCES AND RETURN AIR CLEARANCES This air handler is approved for zero (0) inches clearance to REQUIREMENTS combustible material on any part of the air handler exterior casing. Refer to Table 5 and Figures 3 and 4 for clearance to LOCATION combustibles and for service access clearances.

  • Page 8: Air Handler Orientation, Supply Air Duct, & Return Air Filters

    For A/C and HP Air Handlers 1/3 HP Blower Motor On (MSVE, MSVT18 & 24) Another option is to use a SunTherm Air Filter Base Accessory Kit • Minimum 200 in free area opening which can be used on the return air end of the air handler when •...

  • Page 9: Indoor Coil Disassembly When Converting To Downflow

    HORIZONTAL APPLICATION Horizontal applications will normally be used in an attic or crawl space. This type of installation requires supply air plenum or duct to be connected to the supply collar and a return air plenum or AIR HANDLER duct be attached to the air handler inlet collar. The supply ducts will be connected to the supply air plenum and routed through the attic to a register in each room.

  • Page 10: Installing The Air Handler

    8. Connect the electrical supply wires and the thermostat Thermal Expansion Valves (TXV) control wires in the control box. SunTherm air handlers can have a factory installed thermal 9. Connect the refrigerant lines to the coil. expansion valve (TXV) or a TXV may be field installed. The factory 10.

  • Page 11: Txv Sensing Bulb Location

    Coil is pressurized with nitrogen from the factory. Relieve pressure before installing TXV by depressing the Shrader valve on the coil manifold. FIELD INSTALLED TXV INSTALLATION The TXV assembly is to be installed between the flowrator distributor and the existing liquid line attached to the flowrator distributor as shown in Figure 10.

  • Page 12: Line Voltage Wiring

    CONDENSATE DRAIN PIPING: circuit breaker from the top and tighten the set screw to clamp down on the wire. The air handler “A” coil drain pan has two ¾” NPT female primary 7. Insert the WHITE or RED wire into the L2 screw terminal on the and two secondary connections (left or right hand).

  • Page 13: Electrical Data: 18-36 Kbtu-Single Branch Circuit

    AIR HANDLER MODELS MSVE 18, 24 MSVT 18, 24 MSVE 25, 30, 36 MSVT 25, 30, 36 5 kw Heater Amps - 208/240 VAC 18.0/20.8 18.0/20.8 18.0/20.8 18.0/20.8 10 kW Heater Amps - 208/240 VAC 36.1/41.7 36.1/41.7 36.1/41.7 36.1/41.7 15 kW Heater Amps - 208/240 VAC 54.1/62.5 54.1/62.5 Indoor Blower Motor Type...

  • Page 14: Electrical Data: 25-36 Kbtu-Dual Branch Circuit

    AIR HANDLER MODELS MSVE 25, 30, 36 MSVT 25, 30, 36 Circuit Number 15 kW Heater Amps - 208/240 VAC 18.0/20.8 38.1/41.7 18.0/20.8 38.1/41.7 Indoor Blower Motor Type CONSTANT TORQUE Indoor Blower Amps 2.33/2.03 1.91/1.66 Heater - kW Circuit Number Minimum Circuit Ampacity 28.6 52.1...

  • Page 15: Component Locations - Electric Heat Control Box

    Figure 14: Component Locations – Electric Heat Control Box NOTE: Casing or cabinet must be permanently grounded in accordance with the National Electrical Code or other applicable codes. Figure 15: Component Locations – No Heat Control Box Figure 16: Circuit Breaker Location on Front Panel For personal safety be sure to turn the electrical power “OFF”...

  • Page 16: Field Installed Electric Heater Kits

    SECTION 8: FIELD INSTALLED ELECTRIC HEATER KITS POWER SUPPLY CONNECTIONS If the air handler has been installed prior to installing the electric The field installed electric heat accessories are used on cooling heaters or if an older air handler is being replaced, the supply or heat pump models that were not purchased with electric heat power wires must be checked to make sure the wires are the from the factory.

  • Page 17: Cabinet Wiring Entrances

    Table 12: Accessory Electric Heater Kit Model Number Nomenclature To prevent damage, carefully insert the electric heating After installing the electric heater, a one-inch clearance assembly through the rectangular opening in the front must be maintained on all sides of the supply air duct and/ of the discharge opening so the heat element support or plenum for a minimum of 36 inches from the air handler rod is seated into the hole on the back side of the...

  • Page 18: Low Voltage Connections: 1-Stage Heat & 1-Stage Cooling

    outdoor unit to the “RC” terminal on the thermostat and the RED air handler pigtail wire to the “RH” terminal on the thermostat. If the air handler and outdoor unit using separate transformers are both connected to the thermostat “R” terminal, a transformer Do not locate thermostat within 3 feet of any of the following items: burnout can occur or either the air handler or outdoor unit...

  • Page 19: Low Voltage Connections: 2-Stage Heat & 1-Stage Cooling

    AIR HANDLER AIR HANDLER TRANSFORMER TRANSFORMER 24 VAC 24 VAC 24 VAC 24 VAC COMMON COMMON MSVE MSVE MSVE MSVE ONLY ONLY ONLY ONLY COOLING UNIT OUTDOOR SECTION HEAT PUMP UNIT OUTDOOR SECTION THERMOSTAT THERMOSTAT AIR HANDLER AIR HANDLER Figure 21: Typical Low Voltage Connections - Figure 22: Typical Low Voltage Connections - Two-Stage Heat / Single-Stage Cooling Two-Stage Heat / Single-Stage Heat Pump...
  • Page 20 Typical Heating/Cooling Thermostat Wiring Connections 4. Strip 1/2” of the insulation on the end of each wire. 5. Connect the RED (24 VAC) wire from the thermostat “R” 1. Remove blower / control box access panel. terminal to the “R” terminal on the LVTB or to the RED air 2.

  • Page 21: Blower Performance

    SECTION 10: BLOWER PERFORMANCE Model Motor Volts Motor Blower Speed CFM @ CFM @ CFM @ CFM @ CFM @ CFM @ Number 1 Ph. Code Wheel 0.10” E.S.P 0.20” E.S.P 0.30” E.S.P 0.40” E.S.P 0.50” E.S.P 0.58” E.S.P 50/60 Hz MSVT18 208/240 10 X 7...

  • Page 22: Motor Speed Selection And Air Handler Startup

    SECTION 11: MOTOR SPEED SELECTION 5. Reinstall the blower access panel. AND AIR HANDLER STARTUP 6. Turn the air handler circuit breakers to “ON”. 7. Turn on all electrical supply circuits to the air handler at the main electrical panel. Notice: Refer to the blower performance tables 8.

  • Page 23: Final System Checkout

    ECM Control Board Flash Code 1. Common C1 The ECM control board has a CFM flash code when the air handler 2. W/W1 is in operation to indicate the current CFM. Typically flashes once 3. Common C2 per 100 CFM. 4.

  • Page 24: Wiring Diagrams

    SECTION 13: WIRING DIAGRAMS Figure 26: MSVE 18-72 – ECM Motor – No Electric Heater Figure 27: MSVE 18-72 – ECM Motor – 5 kW Electric Heater MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 24...

  • Page 25: Wiring Diagram: Msve 25-72; Ecm Mtr; 10 Kw Electric Htr

    Figure 28: MSVE 18-72 – ECM Motor – 10 kW Electric Heater Figure 29: MSVE 25-72 – ECM Motor – 15 kW Electric Heater MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 25...

  • Page 26: Wiring Diagram: Msve 42-72; Ecm Mtr; 20 Kw Electric Htr

    Figure 30: MSVE 37-72 – ECM Motor – 20 kW Electric Heater Figure 31: MSVT 18-72 – Constant Torque Motor – No Electric Heater MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 26...

  • Page 27: Wiring Diagram: Msvt 18-72; C.t. Motor; 5Kw Electric Htr

    Figure 32: MSVT 18-72 – Constant Torque Motor – 5kW Electric Heater Figure 33: MSVT 18-72 – Constant Torque Motor – 10kW Electric Heater MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 27...

  • Page 28: Wiring Diagram: Msvt 36-72; C.t. Mtr; 15Kw Electric Htr

    Figure 34: MSVT 25-72 – Constant Torque Motor – 15kW Electric Heater Figure 35: MSVT 37-72 – Constant Torque Motor – 20kW Electric Heater MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 28...
  • Page 29 Subject to change without notice 61M1S001B Copyright by Mortex Products Inc. 2023 Supersedes: 61M1S001A MORTEX PRODUCTS INC. 501 TERMINAL RD FORT WORTH, TX 76106 Page 29...

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