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Bulletin 30-015.003 

 

Copyright © 2017 Unico Inc.  

 

Page 3 

Installation Specifications 

 

 

Model Number Key 

 

V 24 30 B 1 EC2 BX

Cabinet Size (Nominal Minimum Capacity
24=24000Btu/hr (7.0kW)
30=30000Btu/hr (8.8kW)
36=36000Btu/hr (10.5kW) (only EC1 and EC2)

Nominal Maximum Capacity
Thousands Btu per hour

Power Supply, Motor Type
EC1=1,50/60,120 variable-speed
EC2=1,50/60,208/230 variable speed

Configuration
B
= both (universal)

-

Model Series
V=Single piece vertical unit (fan coil)

Revision
1, 2, 3, etc.

Cooling Coil
B=ac/heat pump coil, 3-row with R410A TXV
E=ac/heat pump coil, 4-row with R410A TXV

Heating Coil
X=non included
H=hot water coil included

INTRODUCTION 

General.  

 The information on the following pages is 

to help the installer save time, provide the best possible 
installation  and  insure  continuous  trouble-free 
operation. 

Scope. 

These  instructions  apply  to  the  Unico 

V2430/3036/3642  Vertical  Air  Handler  Unit.  The 
Unico  vertical  air  handler  unit  (V-AHU)  is  a  single 
packaged  unit.  The  cooling  and  heating  coils  are 
contained  within  the  same  cabinet.    The  unit  is 
mounted in a vertical up-flow configuration. The coils 
can  be  combined  as  a  heating-only,  cooling-only,  or 
heating and cooling fan coil unit (see Figure 1). 
The vertical unit is available in three sizes: 2430, 3036, 
and  3642.  The  heating  only  system  includes  the 
blower/motor and a hot water coil.  The cooling only 
system 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 small 
duct  system.  The fan  coil unit and  duct system  were 
designed  to  operate  together  to  provide  the  proper 

airflow  in  every  installation.  The  conditioned  air  is 
supplied through a series of two-inch diameter ducts as 
a stream of air that entrains and mixes with the room 
air. This  process  of  aspiration  produces  a  more  even 
temperature  distribution  in  the  room  than  a 
conventional system. 

Installation instructions for the air distribution system 
are  covered  in  other  bulletins.  Before  beginning  any 
installation, a detailed system layout must be done in 
accordance  with 

Bulletin  40-40  System  Sizing  and 

Layout bulletin

SUFFICIENT 

BUILDING 

INSULATION 

IS 

ESSENTIAL  FOR  THE  MOST  ECONOMICAL 
OPERATION 

General Precautions and Safety Tips

 Do not attempt 

to  install  or  startup  unit  without  first  reading  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  Fire 
Protection 

Association 

and 

Underwriters 

Laboratories  applicable  standards  and  regulations. 
In case of conflict, local codes take precedence. 

Содержание V2430

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

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

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

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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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