Uniflair WMA 0181, WMA 0331, WMF 0251, WMA 0281, WMA 0551 Operation And Maintenance Manual
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OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
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OUTDOOR MONOBLOC AIR CONDITIONING
UNIT FOR INSTALLATION ON SHELTERS
AND PRE-FABRICATED BUILDINGS
WMA/WMF
0121- 0181 - 0251 - 0281 - 0331
0551 - 0661
OPERATION AND
MAINTENANCE MANUAL
GB
© UNIFLAIR 2000
OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
2 (32)
Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
Before installing or working on the unit, read this instruction manual
carefully. Follow all instructions and safety procedures contained in
this manual and displayed on the unit
Some characteristics of special versions of these units may differ
from those described in this manual.
UNIFLAIR ITALIA S.r.l.
Via dell’Industria, 10
35020 BRUGINE (Padova) Italy
Tel. +39 (0)49 9713211
Fax. +39 (0)49 5806906
Internet: www.UNIFLAIR.com
E-Mail: info@UNIFLAIR.com
Release:
2.0
Date:
18 - 07 - 2000
Checked by:
OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
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Contents
Page
GENERAL DESCRIPTION 4
Documentation enclosed with the unit 4
Description of the unit and intended use 4
Function limits 5
Description of main components 5
Accessories 6
Function principles 7
Free-cooling system 7
Data plate 10
START-UP AND TESTING 11
Start-up procedure 11
FUNCTION & REGULATION 12
Microprocessor control 12
Management of two units 13
Measurement and alarm devices 14
Regulation of condensation pressure 15
Setting the regulation and safety devices 16
Setting the airflow sensor 17
Setting the dirty filter sensor 17
TECHNICAL DATA 18
General characteristics 18
Electrical characteristics 20
MAINTENANCE 22
Regular checks 22
Cleaning and changing the air filter 22
Cleaning the external air pre-filter 23
Cleaning the air-cooled condenser 23
Damper maintenance – changing the motor 23
Changing the electrical heating element 24
Cleaning and changing the condensate drain tube 24
Adjusting the refrigerant charge 24
PROBLEM SOLVING 26
Temperature control 27
Humidity control 27
Fans 28
Refrigerant circuit 28
Compressors 30
Electric heaters 30
Free cooling 31
IMPORTANT: the description of the Control System and the operating logic of the unit are given in the
mP20W Control System instruction manual.
OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
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Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
Family Unit Function Model Number of Version Control
type mode Compressors System
W: wall M: monobloc F: mech.+ free. cooling
C: Basic version W: mP20W
mounted A: mech. cooling only
T: With electric re-heat microprocessor
W M F 066 1 T W
GENERAL DESCRIPTION
DOCUMENTATION ENCLOSED WITH THE UNIT
Every unit is supplied complete with the following documents:
• Unit instruction manual
• Microprocessor control instruction manual
• Electrical diagrams
• Spare parts list
• CE declaration listing the directives and norms to which the unit conforms
• Guarantee certificate
UNIT DESCRIPTION AND INTENDED USE
The WM is an autonomous monobloc direct expansion air conditioning unit with air-cooled condenser, designed for
the air conditioning of telephone exchanges, shelters and technological applications. The unit is pre-charged and
tested in the factory and has its own built-in condenser. Installation consists of simply fixing the unit to the wall,
connecting the air ducting and making the electrical connections.
All essential components can be inspected and removed from the front (with the exception of the damper motor in
WMF units from 0121 to 0331), in multiple installations units can therefore be fitted very close together (see
installation manual).
ACTIVE SAFETY
The control system provides monitoring and prevention functions via:
• Function status indication
• Continuous reading and display of the temperature measured by the sensors
• Indication of fault and alarm situations
• Automatic stopping of unit components in the event of risk
• Compressor management to reduce start-up frequency.
PASSIVE SAFETY
The essential functions of the units are protected against faults and potentially dangerous conditions; WM units are
fitted with:
• High and low-pressure pressostats to protect the refrigerant circuit (HP with manual re-set)
• Low airflow differential pressostat
• Dirty filter differential pressostat (optional)
• Safety thermostat on units with electric heater
• Compressor electric motor protection
• Phase sequence relay on units with 400V/3N/50Hz power supply (models 0331 to 0661).
PERSONAL SAFETY
The design and wiring of Uniflair air conditioning units conform to 73/23/CEE. The electrical panels are equipped
with an auxiliary 24V circuit and include individual short circuit protection using automatic circuit breakers. The axial
fans are protected by metal grilles.
OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
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FUNCTION LIMITS
T outside air
T room air
T i = 40 °C
T i = 19 °C
T i = 35 °C
T e = 45 °C T e = 47 °CT e = 18 °C
Only if the condenser is fitted with the
RVC/e speed regulator
MODELS WM 0551-0661
DESCRIPTION OF MAIN COMPONENTS
SELF-SUPPORTING FRAME in 1.2 mm galvanised steel
EXTERNAL PANELS in 1.2 mm, galvanised steel with RAL9001 cream-coloured epoxy powder paint and internally
lined in self-extinguishing abrasion-resistant sound and heat insulation material. Units are also available with
aluminium external panels
FILTER in self-extinguishing material with EU2 efficiency (doc. Eurovent 4-5) fitted in rigid metal frame
SINGLE INLET RADIAL FANS in the evaporator section
AIRFLOW SENSOR for activating a low airflow alarm
COOLING COIL: hydrophilic -treated large frontal area manufactured in copper tubing mechanically expanded into
aluminium fins, stainless steel tray with flexible condensate drain tube
ELECTRICAL HEATERS (optional) with finned aluminium elements and safety thermostat for cutting off the power
supply and activating the alarm in the event of overheating
ELECTRICAL PANEL housed in a compartment isolated from the airflow and which conforms to norms 73/23/CEE
- 89/336/CEE with:
• auxiliary 24V transformer
• main switch
• magnetothermal protection
• remote command switches
SCROLL COMPRESSOR with high energy efficiency, low noise levels and built-in thermal.
FREE COOLING (WMF units): managed by the microprocessor which controls a motorised damper for the
introduction of fresh air.
REFRIGERANT CIRCUIT including:
• filter drier and flow sight glass
• thermostatic expansion valve
• high and low-pressure pressostats (HP with manual reset)
mP20W MICROPROCESSOR CONTROL: includes room, outdoor and air delivery temperature sensors
‘TORX’ anti-tamper external screws
OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
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Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
ACCESSORIES
The following optional accessories can be added to the basic version of the unit:
RVC/e: condenser fan speed regulation with SPC pressure sensor
USER TERMINAL for the setting and display of unit function parameters; to special order the terminal can be
housed inside the unit’s electrical panel on a hinged plate or a wall fitting kit can be supplied for remote installation
CLOCK CIRCUIT for the management of time and date events
LAN BOARD for the local network connection of two units
LAN & CLOCK BOARD
RS485 SERIAL OUTPUT for data transmission to a centralised supervision system
BLOCKED FILTER ALARM SENSOR consisting of a dirty filter pressostat
EU4 high-efficiency filter (replacing standard EU2 filter)
R407C REFRIGERANT (replacing standard R22)
DOUBLE ELECTRICAL POWER SUPPLY - normal function uses mains power, emergency function uses UPS
230V/1N/50Hz for the fan, microprocessor control and free-cooling damper
DOUBLE ELECTRICAL POWER SUPPLY WITH 48V DC FROM INVERTER: normal function uses mains power,
emergency function uses UPS 48V DC for evaporator fan, microprocessor control and free-cooling damper motor
DC FANS
TEMPERATURE AND HUMIDITY SENSOR (in place of standard temperature-only sensor)
SPRING-RETURN DAMPER to special order on WMF units
OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
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FUNCTION PRINCIPLES
(basic version – mechanical cooling)
Air from the room is taken in by the recirculating fan through opening (I),
cooled by the evaporator coil and delivered into the room through opening
(M). In “T” versions, the air may be heated by the electric elements (H) before
being delivered into the room.
Fig. 1
M
I
H
FREE COOLING
(WMF UNITS)
The free cooling cycle consists of the introduction into the room of fresh air when this is sufficiently cold to absorb
the thermal load of the room. The unit is fitted with a butterfly damper and two air intakes:
• recycled air intake (on left hand diagram)
• external air intake (on right hand diagram).
A. NORMAL FUNCTION (figs. 2a and 3a)
During normal function the damper (S) is positioned to take in air only from the room (arrow on the left), closing the
external air intake.
The air is filtered (F), cooled and dehumidified in the cooling coil (E) and returned to the room by the fan (MVE).
Cooling is via the cooling cycle, starting the compressor (CP).
B. FREE COOLING (free cooling) (figs. 2b and 3b)
As soon as the external air is of a low enough temperature to maintain the temperature in the room at the desired
level, the damper (S) changes position, delivering fresh air into the room instead of recycled. During free cooling
function, the compressor is off.
C. MODULATING FUNCTION (fig. 2c and 3c)
When the outside temperature falls further, the control system therefore changes the damper position to mix fresh
and recycled air to maintain room temperature at the required level. In any case, the temperature of the air taken in
is maintained above a pre-set minimum.
OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
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Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
MINIMUM QUANTITY OF FRESH AIR
It is possible to pre-set a minimum opening position on the damper to allow the introduction of a proportion of fresh
air in any operating mode.
(a) (b) (c)
MVE
E
Q.E.
CP
F
S
MVC
MODELS WMF 0121-0181-0251-0281-0331
Fig. 2
(a) (b) (c)
CP
E
S
MVE
F
MVC
Q.E
MODELS WMF 0551-0661
Fig. 3
OPERATION AND MAINTENANCE MANUAL
Wall Mounted 0121…0661
Monobloc Wall Mounted Unit - WMA/WMF 0121-0181-0251-0281-0331-0551-0661 - Rev. 2.0. - Date: 18-07-2000 EN
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INTELLIGENT FREE-COOLING
This system gives dynamic control of the free-cooling phase, maximising energy-saving performance at all times.
The result is the ability to provide much greater energy saving (and therefore economy of operation) than the
common fixed-point free-cooling systems.
The microprocessor compares the thermal load present at that moment in the air conditioned environment with the
outside temperature, calculating the optimum temperature at which to start free-cooling. In this way the temperature
at which free-cooling starts is not fixed but changes to adapt to the load conditions present at that moment in the air
conditioned environment
If required, fixed point or fixed differential free-cooling cycles can also be activated; this type of function does not
consider the heat load in the room.
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