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VERTICAL AHU

INSTALLATION MANUAL

BULLETIN 30-015.003

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Summary of Contents for V2430

Page 1: ...VERTICAL AHU INSTALLATION MANUAL BULLETIN 30 015 003 ...

Page 2: ...ON 6 PIPING 7 SEQUENCE OF OPERATION 11 CHECKING AIRFLOW 11 CHARGING A COOLING SYSTEM 12 CHARGING A HEAT PUMP SYSTEM 14 Certified to UL Standard 1995 Conforms to CAN CSA Standard C22 2 NO 236 Unico products comply with the European regulations that guarantee product safety ...

Page 3: ...m includes the blower motor and a cooling coil For the heating and cooling system both coils are provided The cooling coil is a heat pump coil B Style or E Style All insulated Unico System Vertical air handlers feature closed cell insulation for improved sound attenuation There is no exposed insulation The Unico System is a complete indoor comfort system that includes an indoor fan coil unit and s...

Page 4: ...erant coil so it is very important to verify that the air temperature leaving the refrigerant coil is always greater than 32 F If not or if unsure install an averaging air temperature thermostat on the front of the hot water coil to automatically shut down the system should the air entering the hot water coil fall below 35 F The same must be done if bringing in fresh outside air that could be belo...

Page 5: ...e unit high enough in the secondary drain pan for the drain line to clear the side DUCT CONNECTION Supply Plenum The unit must have a plenum attached to the blower discharge The plenum can be most any type of duct provided it is the correct size and is insulated The EC motor is variable speed so no restrictor plate is required The supply duct attaches to the air handler with a supply adapter sold ...

Page 6: ...th acoustical insulation typically duct liner The minimum height of the plenum duct is shown in figure 5 Figure 5 Minimum duct return Although Unico only supplies a single return system the return system can be redesigned for multiple returns The return duct system is not high velocity Therefore the return system static pressure should not exceed 0 15 inches of water column Generally this means si...

Page 7: ...EVENT THE FORMATION OF OXIDES The refrigerant lines are copper flare connections The sizes are shown in Table 4 Refer to the condensing unit manufacturer s instruction for proper line sizing information based on distance from condenser Table 3 Liquid and Suction line size Model Size Liquid line Vapor line 2430 3036 3642 1 4 Flare 3 8 Flare 3 8 Flare 1 2 Flare 5 8 Flare 3 4 Flare Install a liquid l...

Page 8: ...nnections by charging the system with 150 psig of dry nitrogen and check for leaks at all connections Locate the bulb at the 2 4 8 and 10 o clock position on a horizontal straight section of the suction line Attach the bulb to the tubing with the two pieces of cork tape that are provided Figure 12 For satisfactory expansion valve control good thermal contact between the bulb and the suction line i...

Page 9: ...ulated to prevent freezing If the coil will not be used for an extended period of time during cold temperatures drain the system then flush with a glycol solution Wiring WARNING DISCONNECT ELECTRICAL SUPPLY BE FORE WIRING UNIT TO PREVENT INJURY OR DEATH FROM ELECTRICAL SHOCK All electrical wiring must comply with all local codes and ordinances Make electrical connection in accordance with the wiri...

Page 10: ...Bulletin 30 015 003 Copyright 2017 Unico Inc Page 10 Figure 14 Wiring Schematic 230V ...

Page 11: ...ndoor unit The heating system is now operating in stage one If the first stage does not satisfy the thermostat the second stage thermostat calls for more heat This closes the W2 contacts and energizes the sequencer for electric heat When the second stage thermostat is satisfied the W2 circuit is broken and the sequencer is de energized The electric heating system is now off When the first stage th...

Page 12: ... want it and cut or punch a small hole in the duct Make the hole the same size as the metal tube to prevent leakage Insert the metal tube one inch 25 mm so that the tip of the tube is flush to inside wall of the duct and perpendicular to the air stream as shown in Fig 13 Attach the metal tube to the manometer using a rubber hose usually supplied with the manometer Record the pressure Note If the t...

Page 13: ...be insulated or strapped to the suction line and both insulated The same problem can occur for long refrigerant lines in this case increase the size of the liquid line to reduce the pressure drop CAUTION TO MAINTAIN PROPER HEAT PUMP OPERATION DO NOT STRAP THE LIQUID AND SUCTION LINES TOGETHER FOR HEAT PUMP SYSTEMS Superheat Method Do not charge the system based on superheat Superheat measurements ...

Page 14: ...se it is overcharged if the system was charged during cooling Likewise the system may cycle on the anti frost control because of a low refrigerant charge if the system was charged during heating To compensate for this charge difference some outdoor unit manufacturers have a charge compensator device that stores charge while in heating mode Unfortunately there are no add on devices to accomplish th...

Page 15: ...pump section being used Table 5 R410A Saturation Pressure Temperature F psig C kPa gauge 0 48 4 18 330 2 51 1 17 347 4 53 8 16 363 6 56 6 15 380 8 59 4 14 398 10 62 4 13 416 12 65 4 12 434 14 68 6 11 453 16 71 8 10 473 18 75 1 9 493 20 78 5 8 513 22 82 1 7 534 24 85 7 6 556 26 89 4 5 578 28 93 2 4 601 30 97 2 3 624 32 101 0 2 648 34 105 0 1 673 36 110 0 0 698 38 114 0 1 723 40 119 0 2 750 42 123 0...

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