Unico M Series Installation Manual

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INSTALLATION MANUAL

FOR 'M' SERIES

AIR HANDLER UNITS

BULLETIN 30-020

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Page 1 INSTALLATION MANUAL FOR ‘M’ SERIES AIR HANDLER UNITS BULLETIN 30-020...
Page 3 Only auxiliary devices approved by Unico, Inc. or declared suitable for use with A2L refrigerant shall be installed in connecting ductwork. The following is a list of auxiliary devices sold by Unico, Inc. approved for use with Unico, Inc. HVAC equipment: DD.3.1 –...
Page 4 A degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant and preferably expel it externally into the atmosphere. Copyright © 2025 Unico Inc. Page...
Page 5 Clause DD.9. excessive pressure, vibration, sharp edges or any other adverse environmental effects. The check shall also take into account the effects of aging or continual vibration from sources such as compressors or fans. Copyright © 2025 Unico Inc. Page...
Page 6 Ensure that the refrigerating system is earthed prior to charging the system with refrigerant. • Label the system when charging is complete (if not already) • Extreme care shall be take not to overfill the refrigerating system. Copyright © 2025 Unico Inc. Page...
Page 7 The compressor body shall not be heated by an open flame or other ignition sources to accelerate this process. When oil is drained from a system, it shall be carried out safely. Copyright © 2025 Unico Inc. Page...
Page 8: Table Of Contents
CHARGING THE SYSTEM ..........................31 MAINTENANCE (1218, 2430, 3036, 3642, 4860) .....................34 Certified to UL 60335-2-40 UL 60335-1 Conforms to CSA C22.2 #60335-2-40 CSA C22.2 #60335-1 Unico products comply with the European regulations that guarantee product safety. Copyright © 2025 Unico Inc. Page...
Page 9: Introduction
The cooling module includes a cooling-only refrigerant The Unico System is a complete indoor comfort system coil, a heat pump coil, or a chilled water coil. The that includes an indoor air handling unit and small duct heating module is supplied as an empty cabinet with system.
Page 10: Part Numbers
These include an electric duct heater, multiple return plenum, and a vertical plenum stand. Please refer to the latest Unico Catalog for information on these and other options. Unpacking. All modules are inspected prior to shipping and are carefully packaged in individual cartons.
Page 11 + Cooling Coil + Hot Water Coil + Cooling Coil Horizontal Flow Vertical Up-Flow Vertical The M1218 is not meant for Vertical Down-Flow applications. Down-Flow IL00148.CV5 Figure 2b. Basic Module Arrangement for 1218 Copyright © 2025 Unico Inc. Page 11...
Page 12 (UPC-61) Isolation Typical 10 foot (3.6 m) Return Duct Band Pads Use at least one 90° bend. Secondary Drain Pan (UPC-24D) Platform Return Air Box (UPC-01) IL00039f.cvx Figure 3. Typical Horizontal Attic Installation Copyright © 2025 Unico Inc. Page 12...
Page 13: Ec Motor Temperature Limits
Normal temperature limit. For maximum motor life, screwdriver to pry the gap apart. Secure the modules we recommend that the Unico EC motor be limited to together with the latches, compressing the gasket applications with less than 130°F (54°C) air further.
Page 15 Then set the cooling module on top of the base as shown in Figure 9. Use gasket tape under the cooling cabinet to prevent air leaks. Figure 10. Installing the Blower Module Copyright © 2025 Unico Inc. Page 15...
Page 16 (4) sheet metal screws as shown in Figure 12. Connect the wiring as required in the wiring section and Bulletin 30-039 for the SCB control box and Bulletin 30-037 for the ST control box. Copyright © 2025 Unico Inc. Page 16...
Page 17 UPC-24C under the cooling and heating modules. In this case the blower module will extend beyond the secondary drain pan and should be supported with blocks or an angle iron frame. Copyright © 2025 Unico Inc. Page 17...
Page 18: Mounting
It should be mounted on Table 4. Horizontal Distance of Drain Piping for either a platform or a floor. Unico makes a module Different Framing Materials specifically for vertical installations (refer to previous...
Page 19 Secure the bottom mounting rail to the unit with at least three (3) #10-32 sheet metal screws a minimum of ¾ inches (19 mm) long. IL00171.CV5 Figure 14c. Screw Hole Pattern of Mounting Copyright © 2025 Unico Inc. Page 19...
Page 20: Duct Connections
Restrictor Plate (ST). The single speed (non-ECM) blower includes a restrictor plate to fine-tune the airflow. The purpose of the restrictor plate is to eliminate objectionable outlet noise because the blower is delivering more air than required. In some Copyright © 2025 Unico Inc. Page 20...
Page 21 Attach the proper return duct adapter to The Unico Return Duct system has a single return that either the Heating or Cooling Module. Then attach the includes the return air box with filter, the return duct, return duct to the adapter and to the return air box and the return air adapter (refer to Fig.
Page 22: Piping
Multiple Returns. If more than one return is desired, The standard trap that ships with the cooling coil Unico has designed a return plenum (MR) module. includes a float switch to shut off the system if the The MR module is available in three sizes: 2430, 3036, drain is plugged up.
Page 23 Figure 22. Cut end of connection as shown. 2430/3036/3642/4860 STEP 1. RELEASE THE NITROGEN HOLDING CHARGE. All refrigerant coils are shipped from our factory pressurized with nitrogen. They do not contain any refrigerant. Copyright © 2025 Unico Inc. Page 23...
Page 24 TXV (Figure 25). Attach and tighten lower connecting nut to the distributor as shown in Figure 25. On iSERIES, connect liquid line directly to the distributor (Figure 31). Copyright © 2025 Unico Inc. Page 24...
Page 25 5. After all lines have been connected, pressure check the connections by charging the system with 150 psig of dry nitrogen and check for leaks Figure 27. External equalizer line and themostatic at all connections. bulb line location routing Copyright © 2025 Unico Inc. Page 25...
Page 26 If unit is in an unconditioned space below freezing, care must be taken not to freeze the water in the coil. The best method is to use a glycol-water antifreeze solution with a freezing point below the coldest temperature expected. Copyright © 2025 Unico Inc. Page 26...
Page 27: Refrigerant Detection System (Rds)
Control Box on the Blower Module Cabinet. Attach the opposite end of the cable to the Mitigation Control Board inside the Enclosure Figure 36. Sensor Cable Attachment to Mitigation Figure 33. Mitigation Board Enclosure Mounting Board Copyright © 2025 Unico Inc. Page 27...
Page 28: Zoned Systems
Next, the mitigation board will need to be Power the system and confirm the status of the wired to a thermostat and Unico Control Board. Figure system using the on-board LED lights (Table 9) 38 shows the standard wiring diagram for the RDS.
Page 30: Wiring
Table 11 to correct the airflow. Note: These tables are for the specific motor installed in each blower module. Be sure the table used applies to the correct model number that is shown on the table. Copyright © 2025 Unico Inc. Page 30...
Page 31: Charging The System
For long refrigerant lines or when the evaporator is above the condenser, the sub-cooling should be close to 8°F; otherwise, aim for the low end of the range. Figure 39. Measuring Plenum Static Pressure Copyright © 2025 Unico Inc. Page 31...
Page 32 85 and 105°F (29 to 40°C), superheat should be approximately 8 to 10°F (4 to 3. Determine the sub-cooling with the following 5°C). equation: Saturated Temperature — Liquid Line Temperature = Subcooling Copyright © 2025 Unico Inc. Page 32...
Page 33 36 (2) 104.8 (723) 125.7 (867) properly. 38 (3) 109.0 (752) 129.7 (894) The Unico System will show a lower suction pressure 40 (4) 113.3 (781) 133.8 (923) during the cooling mode than a conventional system. 42 (6) 117.8 (812) 142.3 (981)
Page 34: Maintenance (1218, 2430, 3036, 3642, 4860)
Bulletin 30-020.015 Using a Low Ambient Control Kit. Since the Unico To re-install the motorized blower assembly back into the blower housing, follow the steps mentioned above System operates at colder coil temperatures (in cooling in reverse order. It is not necessary to access both mode), an anti-frost switch is installed on the coil to sides of the unit to remove motor.
Page 35 Do not force in a coil if it is stuck. Forcing the coil into the cabinet could cause damage to the coil or cabinet. Figure 43. Removal of M1218 Cooling Coil Copyright © 2025 Unico Inc. Page 35...

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M1218 M2430 M3036 M3642 M4860

Unico M Series Installation Manual

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