type UTA - Western Airconditioning BV

type UTA 

Technical information manual 

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Western Airconditioning B.V. Hoevelaken Tel. (033) 247 78 00 E-mail: sales@western.nl www.western.nl

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Technical information manual UTA-ECHOS 

REF. UTA-ECHOS-/UTA_ECHOS_2011.DOC 

> UTA ECHOS 

Ductable direct expansion fan coil unit 

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GENERALlTY 



Units for applications of residential and commercial type, characterised by reduced dimensions and easy installation equal to a 

valve convector. Due to their reduced dimensions they are particularly indicated for installations in false ceiling with ducting or air 

emission directly in rooms. 

The air treating units are available in the following constructive versions: 

• UTA ECHOS direct expansion unit 

• UTAH ECHOS heat pump unit 

The UTA-UTAH ECHOS versions are complete with gas load inlet, thermostatic valve, inlet plug connection attachments with 

precarious refrigeration tap . The installation is made easier by the possibility to have (upon request) both the connections on the 

right side and the fan air flow downwards or upwards. The UTA-UTAH ECHOS versions are coupled with motocondensing unit 

functioning with R410A chiller. (Epsilon Echos /LE, Epsilon Echos /LE /HP, Mu Echos /LE, Mu Echos /LE/HP; coupling with Epsilon 

Echos /LE, /LE /HP is defined SPLIT SYSTEM ECHOS). 

TECHNICAL FEATURES 

UTA ECHOS - UTAH ECHOSl unit 

STRUCTURE 

In models 8-18, the structure is made up in galvanised sheet with internal thermo acoustical coating in flexible polyurethane with 

open cells (density 30 kg/m3), flame retardant in class F1. In models 25-41, the structure is made of a frame realised in anodised 

aluminium borders, coupled with aluminium angular joints. The closing panels are made with galvanised sheet with internal thermo 

acoustical coating in flexible polyurethane with open cells (density 30 kg/m3), flame retardant in class F1. 

CONDENSE COLLECTING TANK 

It is made with galvanised sheet, with the outlets located on both sides of the unit in models 6-18. 

FANS 

In models 8-18 they are forward bend blade centrifugal, coupled three speed single phase, with direct dragging through splined 

electric motor on the fans shaft, whereas in models 25-41 a centrifugal fan with forward bend blades coupled with an electric motor 

through belt/pulley transmission is mounted; high prevalence for centralised installation with ducts; the rotors are balanced both 

statistically and dynamically to reduce to a minimum vibrations and noise; for the models 6-18 and upon request, they can be 

mounted with air flow upwards or downwards (see dimensional layouts). 

CONDITIONING COIL 

Made with copper pipes and aluminium flanges, is provided with condense collecting tank; in the direct expansion versions 

(UTA/UTAH Echos) it is complete with thermostatic valve and by-pass with check valve only in “heat pump” version (UTAH Echos). 

AIR FILTER Made with flame retardant synthetic fibres in class F1; maximum separation degree 85% ASHRAE 52-76 Atm (G3 

compliant to EUROVENT 4/5). 

ELECTRIC CONTROL BOARD 

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Standard on the UTW unit and for the models UTA/UTAH Echos 6-18, and is made with a terminal board for connection to room 

thermostat and to power supply 230V/1ph/50Hz. For models UTA/UTAH Echos 25-41 the accessory “electric control board” 

exists (see paragraph “ACCESSORIES”). 

CONNECTIONS 

In models UTA/UTAH 8-18 they are the inter plug type, complete with shutoff cock, whereas in the models 25-41 they are of the 

welding type. In the UTW units they are ¾” or 1” Male Gas depending on the various models. Upon request, the connections can be 

mounted on the right side of the unit. 

INSTALLATION 

The units can be installed in horizontal position with different settings of the air flow; fixing to the roof is made easy thanks to the 

robust brackets provided. 

TESTING 

All units are tested in factory; in particular, the direct expansion units are preloaded with nitrogen at about 12 bar. 

ACCESSORIES 

ELECTRIC CONTROL BOARD 

The accessory “electric control board” with protection degree IP55 exists only for UTA/UTAH Echos 25-41 models. It is made with a 

sectioning device, an automatic fan switch, a fan isolating switch and connection terminal board. 

ROOM THERMOSTAT 

Two options are available for this accessory: 

1. CONTROL THERMOSTAT, electromechanical for mounting on wall, equipped with the following functionalities: 

a. ON / OFF switch 

b. Summer / Winter selector 

c. Thermostat selector switch for speed / continuous / OFF 

d. Three-speed fan selector 

e. Viewing with a display of temperature 

f. Set point on the display in steps of 0.5 ° C 

g. Setting differential of 0.5 ° C to 5 ° C in steps of 0.1 ° C 

2. DIGITAL ROOM THERMOSTAT, digital with liquid crystals display for mounting on wall, equipped with the following 

functionalities: 

a. ON/OFF button 

b. manual SUMMER/WINTER button 

c. automatic SUMMER/WINTER management 

d. dehumidification management 

e. ventilation management only 

f. set point change 

g. fans’ three speeds selector 

h. “sleep” function (automatic speed change + automatic set point change) 

i. timed thermostat function 

j. thermostat lock function (ON/OFF, set change, 3 speeds) 

k. ON/OFF management (in list) or modulating 0/10V (N:B: available only upon special request, out of list) of the ON/OFF hot water 

coil valve 

l. ON/OFF management (in list) or modulating 0/10V (N:B: available only upon special request, out of list) of the electric resistances 

m. serial connection to supervisor through bus RS485 (N:B: available only upon special request, out of list) 

AIR MIX PLENUM (RECIRCULATION/EXTERNAL AIR) 

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The accessory “air mix plenum (recirculation/external air)” exists only for UTA/ UTAH Echos 6-18 models, which allows the 

adjustment of the mix between the external air capacity (renew) and that of the internal air (recirculation). 

ELECTRIC HEATING COIL 

Is made with frame in galvanised sheet and armoured aluminium heating elements which allow a rapid and uniform heat 

transmission; is complete with protection fuses, safety thermostat and isolating switch. In the functioning coupled with the UTAH 

Echos units,its insertion is adjusted by a microprocessor, this condensing unit through the return air temperature; it is always 

activated during the defrosting cycle. You can change the set point of the resistance activation by adjusting the parameters A08- 

A09. Refer to the service before making any changes. 

HOT WATER COIL 

Is made with copper pipes coil and aluminium louvers. This accessory is necessary when it is not advisable to heat the room with 

“heat pump” unit (with low temperatures of the external air); upon request, it can be mounted with the hydraulic connections on the 

right side of the unit. 

SILENCED PLENUM 

Made with a septa silencer, reduces the noise inserted in the air duct. 

FLOW INLET PLUG 

The accessory “flow inlet plug” exist only for models UTA/UTAH Echos 6-18, which facilitates the connection for the distribution of 

air through the flexible ducts. 

GAS ATTACHMENTS ON THE OPPOSITE SIDE TO THE STANDARD ONE 

Upon request, the connections can be mounted on the right side of the unit. 

FANS USEFUL PREVALENCE from 100 Pa to 300 Pa 

In case it is necessary to duct the UTW and UTA/UTAH units with functionings which require static prevalence from 100 to 300 Pa, 

it is possible to select one of the following accessories: 

• fans useful prevalence equal to 100 Pa; 




• fans useful prevalence equal to 300 Pa. 

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Uta Echos / Utah Echos - technical data 

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Electric data 



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Uta Echos / Utah Echos - yield during cooling 

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Utah Echos - yields during heating 



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FANS’ PERFORMANCES 

The nominal air capacities to which the performances of the units UTA ECHOS / UTAH ECHOS and UTW are supplied, refer to the 

available statistic pressures (at maximum fan speed) as summarised in the table. 

The capacity/prevalence bend features show the effective performances of the units, comprehensive of the internal load losses of 

the equipment; they refer to clean coils and air filters. 

The crossing between the bends characteristic of the unit with the capacity/ load loss square bend of the plant, determines the 

functioning air capacity. 

The capacity/prevalence characteristic bend do not take into account the eventual load losses of the optional hot water coil, which 

load losses are illustrated in the graph below. 

To calculate the yield with air capacity conditions different from the nominal one, refer to the correction factors indicated on page 21. 

EXAMPLE: 

Let us suppose wanting to obtain the useful static prevalence of the UTA ECHOS 8 unit with an air capacity of 0.35 m3/s and with 

hot water coil (load loss 11Pa); as highlighted by the performances bend, the useful static prevalence at the three speeds is: 

MAX speed: 192 - 11 = 181 Pa 

AVERAGE speed: 150 - 11 = 139 Pa 

MIN speed: 41 - 11 = 29 Pa 

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Fan prevalence 



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CORRECTION FACTORS 

The above indicated bends of the correction factor of the total, sensitive and load loss yield depending on the variation of the air 

capacity, refer only to the UTW units, at the following functioning conditions: 

• Input air temp.: 26 °C BS 19 °C BU 

• Input/output water temp.: 7/12 °C 

EXAMPLE: 

Let us suppose to want to obtain the total, sensitive cooling yield and load loss of unit UTW 36 with an air capacity of 0.455 m3/s. 

From the table on page 4 the following values can be read: total yield: 10.4 kW, sensitive yield 7.6 kW, load loss 18 kPa. 

The nominal air capacity: 0.542 m3/s. Requested capacity value expressed in % respect to the nominal capacity 

value: (0.455/0.542) x 100 = 84 %. From the above indicated bends the values of the corrective coefficients 

corresponding to the new capacity value are obtained: 

84% ~> pc tot yield = 0.90; pc sen yield = 0.88 

~> pc load loss = 0.82 

The new values will be: 

total yield = 10.4 x 0.90 = 9.4 kW 

sensitive yield = 7.6 x 0.88 = 6.7 kW 

load loss = 18 x 0.82 = 14.8 kPa 

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Noise levels 



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AIR MIX SECTION (optional) 



It is a plenum pre-arranged to be installed with external air inlet both right and left rotating by 1800 (see drawing); and supplied, 

standard, the adjusting handle; on the opposite side, a 10mm square peg is present for servocontrol. 

SILENCED PLENUM (optional) 

It is a plenum complete with acoustical septa to be installed in air flow in order to reduce the noise inserted in the ducts; the sound 

pressure level at the air flow mouth, with and without silenced plenum, is reported in the following table; for completeness, also 

reported, is the noise value to the suction mouth of the unit, respect to which the installation or not of the silenced plenum has 

no influence. 

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Noise pressure levels 



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Noise pressure levels 



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THERMOSTAT (optional) 

The thermostat DB-TA-393 allows control of air temperature in summer and winter conditions. 

Through the three switches located on the front of the thermostat can perform the following functions 

VENTILATION 

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CARATTERISTICHE TECNICHE 



Power supply : 230 Vca ± 10%, 50/60 Hz 

Max load : 6 A 

Output : 1 relè SPDT 230 Vca 6 A 

Power input. : 1 W 

Sensor : NTC 10K 

Scale : 0...+40 ºC 

Set point : +5...+30 ºC impostazione a passi di 0.5 ºC 

Differential : 0.5 ºC 

Display : risoluzione 0.1 ºC 

Operating : 0...+40 ºC 10...90% u.r. (senza condensa) 

Storage : -20...+70 ºC < 95 % u.r. 

Housing : ABS autoestinguente secondo UL94 V-0 colore (RAL 9010) 

Protection : IP30, classe II 

Dimensions : 144 x 82 x 27 mm 

Weight : 220 g 

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DIGITAL ROOM THERMOSTAT (option) 



It is of electronic/digital type and allows to control the temperature both in summer and in winter, making more functions of the 

“control thermostat (electromechanical)” available, also thanks to the intuitive digital display. 

This accessory is made up of the three following components: 

LCD TERMINAL 

Allows the user to set the MasterAria functioning and display the alarms. The LCD display makes its use easy and intuitive. Also 

contains an NTC probe which can be used to carry out the adjustment of the room temperature. 

Operates the fan and adjusts the temperature. Allows connection of digital inputs for remote control functions such as ON / 

OFF switch, summer / winter economy (see sleep function) etc.. It has, through its accessory, a serial port for networking of multiple 

units (supervisory system). It allows you to manage actuators ON / OFF (valve resistance, damper) and requests for hot and cold 

water to the chiller and heat pump / boiler. 

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FUNCTIONING MODE 



COOLING (SUMMER) 

Once the device has been switched on, by pressing the ON/OFF button, you must: 

• repeatedly press the MODE button until the summer symbol switches on (snow flake-cooling); 

• set the set point (desired temperature) using the UP and DOWN buttons; 

• repeatedly press the fan button to choose the desired ventilation speed; in case of selecting the AUTO mode, the 

speed is decided by the electronic control depending on the gap from the desired temperature (the higher the gap, the 

faster the speed). If the COOL ENABLE function is active, the fan activates only if the temperature of the coil is 

sufficiently low, in order to avoid unpleasant flows of hot air. If this condition is not satisfied, the cooling symbol (snow 

flake) flashes. 

HEATING (WINTER) 


• repeatedly press the MODE button until • switch on of only the winter symbol (sun-heating) or winter symbol with 

resistance, if installed (*). In this latter case, the electric resistance is also used as source of heat; 



speed is decided by the electronic control depending on the gap from the desired temperature (the higher the 

gap, the faster the speed). If the HEAT ENABLE function is active, the fan activates only if the temperature of the coil 

is sufficiently high, in order to avoid unpleasant flows of cold air. If this condition is not satisfied, the heating symbol 

(sun) flashes. In case the electric resistance is installed (marked by the relative symbol on the display) the ventilation 

carries on for 20 sec even after its deactivation. Such timing is respected also in case of switch off of the ON/OFF 

button. 

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DEHUMIDIFICATION 


• repeatedly press the MODE button until the dehumidification symbol switches on (drops); 


• repeatedly press the fan button to choose the desired ventilation speed; in case of selecting the AUTO mode, the fan 

turns at minimum speed. The fan activates only if the temperature of the coil is sufficiently low, in order to avoid 

useless flows of hot and humid air. If this condition is not satisfied, the “dehumidification” symbol flashes. MasterAria 

starts in cooling mode in order to bring the room temperature near the set point (set point +3 °C) using the set speed, 

therefore it carries out switch on/off cycles of the fan at minimum speed to remove humidity. 

VENTILATION 

Functioning mode can be deactivated by setting parameter 38 equal to value 8. Such mode can be useful to circulate 

the air in the room. In such case, set the minimum opening of the external shutter (parameter 119 > 0%). Once the 

device has been switched on, by pressing the ON/OFF button, you must: 

• repeatedly press the MODE button in order to only leave the fan symbol active (in the lower part of the display) and 

the relative speed bar. 


speed is fixed at average value.The fan activates only if the room temperature is between the temperature 

range 15-35°C, in order to avoid unpleasant flows of hot or cold air. 

AUTOMATIC 


• repeatedly press the MODE button until the AUTOMATIC symbol switches on; 



speed is decided by the electronic control depending on the gap from the desired temperature (the higher the gap, the 

faster the speed). The functioning mode (heating or cooling) is decided by the electronic control depending on the gap 

from the desired temperature: if the room temperature is higher than the set point, the control carries out the cooling 

function, whereas if it is lower, the heating function is carried out. The fan activates only if the temperature of the coil is 

adjusted to carry out the heating or cooling functions. 

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SLEEP 

This function is particularly useful during night-time, when the decrease in the body temperature (due to sleep) 

changes the perception of the room temperature. In the cooling mode (summer) the set point is increased by 2°C the 

number of hours specified on the display, at the end of which, MasterAria returns to the previous functioning (the sleep 

function is deleted). In the heating mode (winter) the set point is decreased by 2°C. To change the values of increase 

and decrease the set point to contact the service. 

To set this function: 

• switch on the device using • the ON/OFF button and select the functioning mode; 

• repeatedly press the “clear” button until setting the desired number of hours for the function to last. In case it is 

necessary to remove the function, press the “clear” button again after having waited 3 sec. from the last time it was 

pressed, or repeatedly press the same button until the maximum number of hours is exceeded, which is 9. 

REMOTE LOCK 

Can be activated with micro switch 3 = ON. 

When the padlock remote lock symbol is present, the functioning mode is fixed on AUTOMATIC (with resistance, if 

installed) and the user can: switch on/off the unit, amend the set point and set the fan speed. The other functions are 

not available. 

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UTA ECHOS - UTA ECHOS 6-18 / UTW 21-81 

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PRACTICAL INSTALLING RECOMMENDATIONS 



POSITIONING 

- Carefully observe the space requirements indicated in catalogue. 

- Verify that there are no obstructions on the suction of the louvered coil and on the fans flow. 

- Position the unit in order to reduce to a minimum the environmental impact (sound emission, integration with present 

structures, etc.). 

ELECTRIC CONNNECTIONS 

- Always consult the attached electric layout, where all necessary instructions to carry out the Electric connections are 

reported. 

- Power the unit (by closing the sectioning device) at least 12 hours before start-up, to allow the powering of the carter 

resistances. Do not remove voltage from the resistances during brief periods of time of unit stop. 

- Before opening the sectioning device, stop the unit by acting on the appropriate start switches, or in absence, on the 

remote control. 

- Before accessing the internal parts of the unit, disconnect by opening the main sectioning device. 

- The power supply line must be protected in compliance with that provided in the regulations in force. 

- Electric connections to be carried out: three polar power cable + earth, or three polar cable + neutral+ earth; external 

consent; remote alarm report. 

HYDRAULIC CONNECTION 

- Accurately remove the hydraulic plant, with pumps switched off, by acting on the small vent valves. This procedure is 

particularly important in that, even the smallest air bubbles can cause the evaporator to freeze. 

- Discharge the water plant during the winter breaks or use appropriate antifreezing mix. In case of brief period of time 

of unit stop, the installation of the anti-freeze resistance on the evaporator and on the hydraulic circuit is 

recommended. 

- Realise the hydraulic circuit including the components indicated in the recommended layouts (expansion tank, flow 

switch, storage tank, vent valves, shut-off valve, anti vibration joints, etc. See use installation and maintenance 

manual. 

- Connect the flow meter in the units for which it is supplied, carefully following the instructions attached to the same 

unit. 

START-UP AND MAINTENANCE 

- Carefully keep to that indicated in the use and maintenance manual. Such operations must be carried out by 

qualified staff. 

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type UTA - Western Airconditioning BV

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