Unico M Series Installation Manual

Air handler unit

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The information on the following pages is to help the in-

staller save time, provide the best possible installation and

ensure continuous trouble-free operation.

These instructions apply to the Unico M-Series air han-

dler units. For heat pump coils, refer to Bulletin 30-24 for

additional instructions. Installation instructions for the air

distribution system are covered in Bulletin 30-05. Before

beginning any installation a detailed system layout must

be done in accordance with the System Sizing and Layout

Procedure, Bulletin 40-40 and the Component Layout In-

structions, Bulletin 40-30.

Do not attempt to install or startup unit without first read-

ing and understanding the appropriate sections in this

manual.

Before operating, be sure the unit is properly grounded.

Installation should be in accordance with all local codes

and regulations and with the National Board of Fire Un-

derwriters regulations. In case of conflict, local codes take

precedence.

All electrical wiring should be in accordance with the lat-

est edition of the National Electrical Code and all local

codes and regulations. The unit is safety certified to UL

1995 and listed with ETL.

Always install a secondary drain pan when an overflow of

condensate could cause damage.

This manual does not always include the latest revision

letter when referring to UPC part numbers. Refer to the

latest Price List and Spec Sheets for the current UPC re-

vision letter. For example, in UPC-00x the 'x' indicates

the latest revision.

The Unico System is a complete indoor comfort system

that includes an indoor air handling unit and small duct

system. The air handler and duct system were designed to

operate together to provide the proper airflow in every in-

stallation. The conditioned air is supplied through a series

of 2-inch ducts as a stream of air that entrains and mixes

the room air. This process of aspiration produces a more

even temperature distribution in the room.

The Unico 'M' Modular Series air-handling units consist

of various modules that are easily latched together. The

modules can be arranged in a vertical-up-flow, vertical-

counter-flow and horizontal-flow configuration. They can

be combined as a heating-only, cooling-only, or heating

and cooling air handler unit. See Fig. 1.

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Summary of Contents for Unico M Series

Page 1 These instructions apply to the Unico M-Series air han- dler units. For heat pump coils, refer to Bulletin 30-24 for additional instructions. Installation instructions for the air distribution system are covered in Bulletin 30-05.
Page 2 4860. There are three basic modules: a blower mod- plenum stand. Please refer to the latest Unico Catalog for ule, a cooling module, and a heating module. The blower information on these and other options.
Page 3 The ideal location is above a central hall, a closet, a bathroom, or any normally unoccupied space. The Unico EC motor includes an electronic circuit board that is sensitive to overheating if the air temperatures sur- The unit can also be installed in a closet, crawlspace, or rounding the motor are above a certain value.
Page 4 Bulletin 30-20 — Page 4 For maximum the gap apart. Secure the modules together with the motor life, we recommend that the Unico EC motor be latches, compressing the gasket further. limited to applications with less than 130°F (54°C) air temperature.
Page 5 AIRFLOW IL00301d.CNV Typical Vertical System Layout For vertical up-flow the return air may enter through the bottom or side return opening of the 2430, 3036 or 3642 cooling module although the bottom opening is preferred. © Copyright 2014, Unico, Inc.
Page 6 For the 2430, 3036 and 3642 systems, use a vertical spacer kit such that the spacer overhangs the back of the vertical plenum and the filter access is not covered over. Airflow Return Air Adapter © Copyright 2014, Unico, Inc.
Page 8 Vertical Mounting. Because the units are top heavy, it is not recommended to suspend a vertical unit. It should Plenum be mounted on either a platform or a floor. Unico makes Insulation Wrap IL00308.CVX a module specifically for vertical installations (refer to Figure 17.
Page 9 (27-34 L/s per nominal kW) has been The Unico Return Duct system has a single return that in- achieved. If elevated sound levels are noticed at the out- cludes the return air box with filter, the return duct, and lets with more than 250 CFM per nominal ton (34 L/s per the return air adapter (refer to Fig.
Page 10 Multiple Returns. If more than one return is desired, Unico has designed a return plenum (MR) module. The Refrigerant Connections. All refrigerant coils have MR module is available in two sizes: 2430 and 3660, and two refrigerant lines: a liquid (small tube) and a vapor it includes a central filter.
Page 11 To prevent equipment damage, DO NOT install an expansion valve inside the indoor unit. Always use new Teflon seals (part no. A00809-001) when replacing the TXV. Figure 23. (Step 2) Remove side panels as shown. © Copyright 2014, Unico, Inc.
Page 12 This will eliminate moisture carry-over and as- sure maximum coil performance. As an alternate to clean- ing, allow approximately 50 hours of break-in time to achieve the same results. Figure 27. (Step 6) Tighten the pressure tube nut as shown. © Copyright 2014, Unico, Inc.
Page 13 (ICT) and one on the face options although the internal wiring is different. Refer to of the coil fins, “the return air temperature sensor” table (RAT). These must be plugged into the ICT and RAT plugs on the board. © Copyright 2014, Unico, Inc.
Page 14 The most important differ- mary voltage of 230V. If power supply is 208V, re- ence in wiring is that the iSERIES Unico air handlers must move ORANGE lead from L2 terminal and connect have a separate electrical supply. It cannot be powered RED lead to L2.
Page 16 Bulletin 30-20 — Page 16 Figure 35. ST2 Control box. Wiring Schematic for Cooling-Only or Heat-Pump without Supplemental Heat (Modified to control ventilation speed mode at thermostat) © Copyright 2014, Unico, Inc.
Page 17 Bulletin 30-20 — Page 17 Figure 36. ST2 Control Box. Wiring schematic Refrigerant Cooling with Hot Water Heat (Modified to control ventilation speed at thermostat) © Copyright 2014, Unico, Inc.
Page 18 Bulletin 30-20 — Page 18 Figure 37. ST2 Control Box. Wiring schematic Heat-Pump with Supplemental Electric Duct Heater (second stage) (Modified to control ventilation speed at thermostat) © Copyright 2014, Unico, Inc.
Page 19 Bulletin 30-20 — Page 19 Figure 38. ST2 Control Box. Wiring schematic Heat-Pump with Supplemental Hot Water Heat (second stage) (Modified to control ventilation speed at thermostat) © Copyright 2014, Unico, Inc.
Page 20 The most important step when installing stage thermostat calls for more heat. This closes the “W2” the Unico System is making sure it has the contacts and energizes the sequencer for electric heat (if correct airflow. Be sure to record the am- installed).
Page 21 High Static, Restrictive duct system. Add outlets, add splitter vane in tee, reduce the num- Low Amperage ber of tees and elbows in plenum, increase plenum size to 9” equivalent, or Open restrictor to proper amperage. © Copyright 2014, Unico, Inc.
Page 22 3 and 8 °F (2 to 5°C). For long refrigerant lines or COMPRESSOR, DO NOT ADD LIQUID when the evaporator is above the condenser, the sub-cool- CHARGE INTO SUCTION PORT. ing should be close to 8°F; otherwise, aim for the low end of the range. © Copyright 2014, Unico, Inc.
Page 23 INTO THE ATMOSPHERE. In some cases, such as in a hot attic, the liquid line will The Unico System will show a lower suction pressure dur- pick up heat and lose its sub-cooling. This will be appar- ing the cooling mode than a conventional system. Gener- ent if the sub-cooling at the evaporator is low.
Page 24 R-22 equipment. ture (English units) ature (SI units) The Unico System is completely compatible with R-410A. psig kPa (gauge) Using R-410A with the Unico System is a simple matter °F R-22 R-410A °C R-22 R-410A of changing the expansion valve.

This manual is also suitable for:

M2430b 1 series M3036b 1 series M3642b 1 series M4860b 1 series