NuAire CM-XBOX-INLINE Instruction Manual

23. 10. 19. Document Number 671925
CM-XBOX-INLINE
Cooling module for use with MVHR Units
Installation and Maintenance
The EMC Directive
2014/30/EU
The Low Voltage
Directive
2014/35/EU
1.0 SAFETY INFORMATION
•The provision of the electrical supply and the connection of the unit to the mains
must be carried out by a qualified electrician. Ensure that the mains supply (Voltage,
Frequency and Phase) complies with the rating label.
•Isolate from power supply before removing any covers. During installation /
maintenance ensure all covers are fitted before switching on the mains supply.
•All-pole disconnection from the mains as shown in the wiring diagram must be
incorporated within the fixed wiring and shall have a minimum contact separation of
3mm in accordance with latest edition of the wiring regulations.
•This unit must be earthed.
•Ducting must be securely fixed with screws to the spigot to prevent access to live
parts.
•If the supply cord is damaged, it must be replaced by its service agent or similarly
qualified persons in order to avoid a hazard.
•When installing the unit, take care not to damage electrical or other hidden
components – do not drill the unit casing.
•Precautions must be taken to avoid the back-flow of gases into the room from the
open flue of gas or other fuel-burning appliances.
•The unit must be installed indoors, and away from direct sources of frost, heat and
water spray or moisture generation. Ambient temperature range -5 to 40 deg C.
•The cooling unit is an electro-mechanical device that contains and uses R407C
refrigerant. The unit provides cooling in the range of 0.4 to 1.4 kW. The weight of the
R407C refrigerant is 0.63Kg.
•This appliance should not be used by children or persons with reduced physical,
sensory or mental capabilities or lack of experience and knowledge, unless they
have been given supervision or instruction concerning the safe use of the appliance
by a person responsible for their safety. Children shall not play with the appliance.
Cleaning and user maintenance shall not be carried out by children. This unit contains
live electrical components, moving parts and refrigerant under pressure. Always site
out of reach of children and protect from vandalism and accidental damage.

CM-XBOX-INLINE Cooling Module for Use with MVHR Units
nuaire.co.uk 029 2085 8200
2.0 INSTALLATION
2.1 General Installation
Installation must be carried out by competent personnel in accordance
with the appropriate authority and conforming to all statutory
governing regulations. All mains wiring must be in accordance with the
current I.E.E. Regulations, or the appropriate standards. Ensure that the
mains supply (Voltage, Frequency and Phase) complies with the rating
label.
Please note clear working space is required around the installed unit to
provide sufficient access for maintenance (Figure 1). Please ensure duct
runs do not obstruct maintenance access points.
The unit must be installed indoors, and away from direct sources
of frost, heat and water spray or moisture generation. Ambient
temperature range -5 to 40 °C.
This unit must be earthed.
When installing the unit, take care not to damage electrical or other
hidden components – do not drill the unit casing.
The cooling unit is an electro-mechanical device that contains and uses
R407C refrigerant. The unit provides cooling in the range of 0.4 to 1.4
kW.
This unit contains live electrical components, moving parts and
refrigerant under pressure. Always site out of reach of children and
protect from vandalism and accidental damage.
Keep the unit horizontal during installation and level the unit in its final
position. Once in final position, leave unit for a minimum of 4 hours
before activation.
Ensure that the airflow through the unit does not fall below 100m3/h
(28 l/s) during operation.
For a vibration-free result the unit must be mounted to a solid surface
in the void. The unit is designed for ceiling mounting only (horizontal
surface).
Position & secure the unit to the ceiling using appropriate fixings
(supplied by others), ensuring that the four outer fixing holes on the
unit are accessible.
Note: The unit must be installed in an upright position as shown for
the condensate drain and for compliance with safety regulations
relating to IP protection for water drip ingress.
2.2 Condensate Drain Installation
Unit comes complete with external condensate drain pipe of 15 mm
diameter positioned 20 mm up from the base and 80mm back from the
supply/exhaust connection face.
Use conventional plumbing connections to link up with U-trap. If using
a U-trap please ensure the U-trap has been filled to a suitable level of
water to avoid any air locks.
If the condensation pipe is fitted in an unheated space the pipe should
be in insulated to prevent freezing.
For domestic waste pipes, the typical 1:40 (around 1.5 degrees) is
recommended. If using a dry trap various suppliers quote a minimum of
10 degrees for a pipe run in line with the unit. Ensure the cooler has its
own trap separate to the MVHR.
•Keep the unit horizontal during installation and level the unit in its final position.
Once in final position, leave unit for a minimum of 4 hours before activation.
•Ensure that the airflow through the unit does not fall below 100m3/h (28 l/s) during
operation.
20
80
SUPPLY
FROM MVHR
COOL AIR TO
INDOOR SPACE
EXHAUST
FROM MVHR
EXHAUST AIR
TO OUTDOORS
ACCESS ZONE
920 x 300 mm MINIMUM
ACCESS TO ELECTRICS
ACCESS FOR VISUAL
INSPECTION OF CONDENSER
ACCESS FOR
VISUAL INSPECTION
OF EVAPORATOR
COOL AIR TO
INDOOR SPACE
EXHAUST
FROM MVHR
SUPPLY
FROM MVHR
EXHAUST AIR
TO OUTDOORS
EVAPORATOR
TOP VIEW (LID REMOVED)
CONDENSOR
COMPRESSOR
CONDENSATE
DRAIN
CONDENSATE
TRAY
HIGH PRESSURE
SERVICE POINT
(COVER REMOVED)
LOW PRESSURE
SERVICE POINT
MAINS POWER
SUPPLY
SWITCH
ACCESS AT REAR
TO ELECTRICS
ACCESS PANEL TO VIEW
EVAPORATOR COIL
ACCESS PANEL TO VIEW
CONDENSER COIL
IMPORTANT
Isolate before commencing work, make sure that the unit,
switched live and Nuaire control are electrically isolated from the
mains supply and switched live supply.
1
2
Unit Overview
Unit Layout

23. 10. 19. Document Number 671925 3
CM-XBOX-INLINE Cooling Module for Use with MVHR Units
•
EXTRACT
FROM
DWELLING
SUPPLY
WITH
COOLING
INTAKE
FROM
OUTSIDE
EXHAUST
WITH HEAT
REJECTION
3.0 DUCTING
Before commencing ducting installation reference should be made
to building regulations document “Domestic ventilation compliance
guide”. This document supports ADF2010 and details installation,
testing and commissioning of all ventilation systems.
It is recommended that rigid ducting must be used it all times. Fresh-air
Intake and stale air Exhaust ducts will carry cold air in winter. Supply
air duct will carry cold air when Cooling Module is operating. Therefore
Intake, Exhaust and supply ducts will be at risk of condensation forming
on external surfaces and should all be insulated. Supply air duct only
needs insulating after the cooling module.
Any duct component including ancillaries such as carbon filters must be
insulated if they are carrying colder air produced by the cooling module.
Flexible connections should be avoided. Nuaire Ductmaster thermal
ducting should be used on Intake, Exhaust and Supply duct runs.
Ducting must be installed in such a way that resistance to airflow is
minimised. Bends should be kept to a minimum.
A minimum distance of 300mm between the appliance and any bends
in ductwork is recommended. 220 x 90mm rectangular ducting should
be used.
Ducting joints must be sealed with silicone type sealant and needs
to be taped. Ducting shall be adequately and reliably fixed to the
appliance with screws to prevent access to live parts.
4.0 SUPPLY TEMPERATURES
Supply air temperature is critical to ensure good cooling distribution
and to avoid condensation forming on supply terminals. MVHR
duty in cooling mode must be sufficient to avoid “Over-cooling”. If
supplying to habitable rooms through Linear Slot Diffusers 12⁰C is the
recommended minimum supply air temperature. If supply to habitable
rooms is by air valve then 14⁰C is the recommended minimum supply
air temperature.
5.0 CONTROLS / DESCRIPTION OF OPERATION
•MVHR will run continuously at Background/Whole dwelling duty
(Speed 1) unless it receives a 230v signal to Switched-Live input
connections SL1 or SL2.
•MVHR will be enabled to minimum-high-rate/Boost (Speed 2)
when it receives a 230v switched live from Kitchen boost switch /
Bathroom lighting circuit / PIR Detector / Remote humidistat, etc.
•Cooling module will be enabled to run and MVHR enabled to
speed 3 by a 230v Switched live from wall mounted thermostat
(Supplied by Nuaire). The Wall mounted thermostat will enable
the cooling module to run and MVHR to speed 3 when the living
room temperature reaches 23 degrees C (when the CM-THERM-
CONTROL is set to ECO).
•N.B. The wall mounted thermostat is factory pre-set to enable the
Cooling module to run and the MVHR to speed 3 at 23⁰C. It may
be necessary to interlock this with the heating system to prevent
the cooling system from running when the heating is ON.
•If supplied with a Summer/Winter MVHR, it will be supplied with
a Summer/Winter switch. When set to summer mode the MVHR
will target a temperature under 21⁰C within the apartment.
•Summer mode can be selected year round to attempt to mitigate
overheating caused by solar gains but must be selected when
cooling is expected to run (summer months).
•Winter mode ensures the MVHR will recover heat at all times.
3 Typical Ducting Arrangement

CM-XBOX-INLINE Cooling Module for Use with MVHR Units
nuaire.co.uk 029 2085 8200
6.0 DIMENSIONS
30
PLAN VIEW (TOP)
220 220
923 (LID)
611 (LID)
TOP (LID)
535
(FIXING CENTRE)
980
(FIXING CENTRE)
CONDENSATE
DRAIN
SUPPLY FROM MVHR
CONNECTION
REAR VIEW
EXHAUST FROM MVHR
CONNECTION
SUPPLY IN
32
EXHAUST IN
32
Ø15
SIDE VIEWSIDE VIEW
80
365
920
20 51
70
90
30220
30 220
35.5
70
90 (INSIDE)
MOULDED SPIGOTS
4
5
Unit Dimensions
Unit Wiring
7.0 ELECTRICAL INSTALLATION
7.1 Wiring
7.2 Electrical Details
Voltage: 230V 1ph 50Hz
Running Current: 2.8 Amp
Locked Rotor Current: 15 Amp
NOTE - This unit must be earthed.
B
A
MVHR
SUPPLY CORD
FROM MVHR
MAINS
230V
50Hz
N
L
L
LIGHTING
CIRCUIT
CM-XBOX-INLINE
COOLING
MODULE
THERMOSTAT CONTROL
CM-THERM-CONTROL B
B
A
B MVHR PURGE / COOLING MODULE ENABLE FROM CM-THERM-CONTROL
A MVHR BOOST CONTROLLED FROM LIGHT SWITCH
(use combined fuse rating
of MVHR and Cooler) Room
Light
Double
Pole Switch
8A Fuse
HRC speed T
3 Pole
Isolator
3 Pole
Isolator
Factory Fitted
Wiring Link
A
Grey
Black
Brown
Blue
Green / Yellow
L1
L1
C
N
L
1
N
N

23. 10. 19. Document Number 671925 5
CM-XBOX-INLINE Cooling Module for Use with MVHR Units
8.0 MAINTENANCE
8.1 Access
The main central panel allows access to controls and electrical
connections. Lower panels either side allows access to front face of
cooling coil, heat rejection coil or refrigerant high and low temperature
test points.
Access may not be possible if the minimum access zone of 920 x
300 mm has not been provided.
8.2 Annual Maintenance - Evaporator and Condenser
•Inspect all heat exchangers for signs of damage or dirt. Loose dirt
may be removed by using a soft brush, taking care not to brush
the dirt into the coil, blocking the fins. Damaged fins should be
combed out using a comb.
•If the coil has become dirty, review the frequency of the filter
checks.
•If the coil is excessively dirty, use a proprietary cleaning agent, e.g.
HYDRO-COIL or MULTISOLVE.
•Inspect the condensate drain tray and clean as required.
•Check all electrical connections for tightness.
•Switch on the power to the unit. Check the operation of the
mechanical cooling system.
•While the mechanical cooling system is operating check the
system pressures, these should typically be:-
Suction pressure (low): 4.48 bar(65 psi) to 5.51bar(80psi)
Discharge pressure (high): 16.54 bar(240psi) to 22.06 bar(320psi)
•Check that all the panels are in place and that the unit is in a clean
condition.
8.3 Repair and Replacement
If, in the event of a failure, a component requires replacing, the
power to the unit must be securely isolated.
8.3.1 Refrigeration Circuit Components
** WARNING **
All repair and replacement work on refrigeration components must
be carried out by a fully qualified refrigeration engineer, trained in
maintenance and refrigeration recovery, and with a sound knowledge of
all relevant safety regulations pertaining to the job.
** NOTE **
A refrigerant reclaim rig must always be available on site when
changing any refrigeration components, to remove all or part of the
refrigerant charge. The liquid line filter drier must be renewed when a
component is replaced.
All refrigerant in the unit must be reclaimed and disposed of safely.
8.3.2 Compressor
In the event of a compressor failure, a sample of oil should be removed
from the compressor by draining through the discharge port. This
sample should be tested, using a proprietary acid test kit, to determine
if the failure has resulted in a burn out. If the oil is clean, a new
compressor can be fitted immediately. In the event of a burn out the
system will need cleaning. In the absence of any approved flushing
agents, a burn out filter must be fitted in the suction line and an
oversized filter in the liquid line.
Ensure that the suction line filter is fitted with an appropriate acid
binding core.
Once the compressor has been replaced, the whole system must be
fully evacuated and the correct refrigerant charge measured in.
The suction line filter should be checked and the core replaced as
necessary until the system is clean, and then removed. The liquid line
filter should be replaced with one of the correct size when the system
is clear.
8.3.3 Pressure Switches
In the event of a pressure switch failure, it is not necessary to empty the
refrigeration circuit. Each pressure switch is connected to a Schrader
type self-sealing service valve, however, a small amount of liquid
refrigerant may escape when disconnecting the flare nut, and gloves
should be worn to protect the hands.
9.0 WARRANTY
The 1 year warranty starts from the day of delivery and includes parts
and labour.
This warranty is void if the equipment is modified without
authorisation, is incorrectly applied, misused, disassembled, or not
installed, commissioned and maintained in accordance with the details
contained in this manual and general good practice.
The product warranty applies to the UK mainland and in accordance
with Clause 14 of our Conditions of Sale. Customers purchasing from
outside of the UK should contact Nuaire International Sales office for
further details.
10.0 AFTER SALES ENQUIRIES
For technical assistance or further product information, including spare
parts and replacement components, please contact the After Sales
Department. Before calling please establish the serial number of the
unit (this information will be available on the unit label).
Telephone [phone]
[e-mail]
IMPORTANT
Isolate before commencing work, make sure that the unit,
switched live and Nuaire control are electrically isolated from the
mains supply and switched live supply.