Lennox EMEA INNOV DMREF- R Service manual

www.lennoxemea.com
INSTALLATION, USE AND MAINTENANCE
MANUAL
INNOV@ DMREF- R
Air Conditioning Units for Close Control Application
INNOV@-DMREF-R-
IOM-0922-EN

Index
1 General Description.............................................................................................................4
1.1 Structure ..........................................................................................................................................5
1.2 Application limits ..............................................................................................................................5
1.3 Cooling circuit ..................................................................................................................................5
1.4 “CW” units hydraulic section............................................................................................................6
1.5 Installation warnings ........................................................................................................................7
2 Inspection / Transport / Positioning ...................................................................................8
2.1 Inspection on receipt........................................................................................................................8
2.2 Lifting and transport .........................................................................................................................8
2.3 Unpacking ........................................................................................................................................8
2.4 Positioning .......................................................................................................................................8
3 Installation............................................................................................................................9
4 Humidifier...........................................................................................................................10
5 Electrical Connections ......................................................................................................12
5.1 Generalities....................................................................................................................................12
6 Operating Diagrams...........................................................................................................13
7 Start-Up ..............................................................................................................................13
7.1 Preliminary checks.........................................................................................................................13
7.2 Starting operations.........................................................................................................................14
8 Setting Operating Parameters...........................................................................................15
8.1 Generalities....................................................................................................................................15
9 Maintenance.......................................................................................................................16
9.1 Warnings........................................................................................................................................16
9.2 Generalities....................................................................................................................................16
9.3 Set the right fan speed...................................................................................................................18
10 Troubleshooting.............................................................................................................20
•3•
INNOV@-DMREF-R-IOM-0922-EN

1 General Description
NEW DMREF R” “CCAC” self-contained units are specially designed for installation in technological
environments such as Computer rooms, laboratories and in general where a high precision in climate
control and a 24h/day operation are requested. NEW DMREF”R” units represent the state of the art
between technology and design as well as all LENNOX products: thanks to their characteristics,
NEW DMREF R can be installed also in offices where people are working. The depth of 600 allows
the compatibility with standard electronic devices: furthermore the innovative design and the high
tech selected colours make NEW DMREF R units complementary to the last generation of IT
devices. The internal design of the units in firstly made looking to efficiency and reliability but don’t
loosing accessibility: all components, including e-heaters, fans, , valves, etc. can be maintained from
the front and furthermore the door(s) are dismountable in few seconds thanks to an innovative hinge:
this is very important when units are installed in small corridors. The exclusive use of primary brands
components and a fully integrated development process (CAD + CAM, CAE) stands for highest
possible quality level regarding efficiency, reliability, maintenance time, pre and after sales support.
Fig. 1 Versions: CW
1
Filter
4
Radial fan
2
Electrical panel
5
Chilled water valve with servomotor
3
Coil
1
2
4
3
5
INNOV@-DMREF-R-IOM-0922-EN
• 4•

5
16
27
32
20
°
C
°
C
DM
C . . . R
Chilled water versions
R.H.
≤
65%
7
Chilled water temperatu
re
Indoor air temperature
1.1 Structure
NEW DMREF R” units are designed with a self supporting frame and all components are produced
using sophisticated computer driven machines and special tools. All sheet metals are galvanized and
all external panels are powder coated RAL 7016 giving to the units the image and the quality like last
generation of IT devices. Units are completely closed and only frontal access is requested. Anyway it
is also possible to have side access in order to reach the steam piping and the drain pan, or simply
to substitute a damaged side panel: all this problems are very rare, but with DMREF R” units it is
possible to solve them. The shape of the units is characterized with the curved edges with variable
radium as for all LENNOX products: this feature is obtained using special tools and gives both a
good aesthetic and advantages against injuries. The compressor compartment is separated from the
air flow and the special internal design allows the simple dismounting of the upper part of it ensuring
an insuperable accessibility to all refrigerating components.
All fixing elements are made in stainless steel or in non corroding materials. The dray pan is made in
stainless steel in order to ensure long time operation without damages.
All panels are thermally insulated with a polyurethane foam class 1 according UL 94 norms: this
material, thanks to the open cells, gives good performances in sound absorption. As an option,
sandwich panels are available: in this case mineral fibres are closed between the panel and a
second sheet of metal giving the maximum in terms of internal cleaning. Double skin panels are
classified between non flammable materials class A1 according DIN 4102 norms : the sound
insulation is better than the standard solution, but the internal reflected sound power will increase the
amount in delivery side (+2dB).
1.2 Application limits
Tab. 2 Operation limits “CW”
Power supply limits and storage conditions for “CW” version
Model
DM
C…R
Power supply
400 / 3+N / 50 +/
-
10 %
Storage conditions
from
-
10 °C / 90 % R.H.
to
+60 °C / 90 % R.H.
Fig. 2 Application limits
1.3 Cooling circuit
The entire refrigerating circuit is assembled in our production line including all pipe work and using
only primary brand for components. The workers involved in the welding and pipe work process are
qualified by a third part according CEE 97/23 PED directive: it is worth to be underlined that this
qualification for workers were not request, but it is our own decision taking care of the quality and/or
in general to the customer satisfaction.
•5•
INNOV@-DMREF-R-IOM-0922-EN

Cooling components
•Chilled water valve with servomotor 0-10 V
Electric control board
Electric control board: The electric control board is constructed and wired in accordance with
Directives 73/23/EEC and 89/336/EEC and related standards. The board may be accessed through
a door after the main switch has been turned off.All the remote controls use 24 V signals powered by
an insulating transformer situated on the electric control board.
•The mechanical safety devices such as the high pressure switched are of the kind that trigger
directly; their efficiency will not be affected by any faults occurring in the microprocessor control
circuit, in compliance with 97/23 PED.
Microprocessor control
The microprocessor built into the unit allows the different operating parameters to be controlled from
a set of pushbuttons situated on the electric control board:
•Alarm signalling.
•Display of operating parameters.
•RS232, RS485 serial output management (optional).
See microprocessor control manual for further details, also in relation to particular customer
specifications.
1.4 “CW” units hydraulic section
3-way valve
The 3-way valve used on INNOV@-R CW version units for inlet water flow regulation allowing a foundamentally
maximum precision’s regulation on CCAC applications.
Tab. 3 Technical characteristics
Frame 1
Frame 2
Kvs valve
(m
3
/h)
6.3
16
PN valve
16 16
Connections
1”
1 ¼”
Air presence on hydraulic circuit
It is necessary to leak air from the hydraulic circuit of unit after the connection to the external circuit. To do this,
open the frontal panels and remove the air filter; after this ,open the small valve on the right-top side of the coil’s
collector(take the front side of unit in reference). Use adapted tools for the manual valve’s setting.
INNOV@-DMREF-R-IOM-0922-EN
• 6•

Standard
Opt. 2
-
way valve
M
5
6
2
3
1
7
2 1
6
5
4 M4
Fig. 5 Basic cooling circuit (CW version)
1.5 Installation warnings
Pos.
Description
Pos.
Description
1
Chilled water inlet
5
Coil heat exchanger
2
Chilled water outlet
6
Purge valve
3
3
-
way valve
7
2
-
way valve (Opt.)
4
Plug fan
-
Pos.
Description
Pos.
Description
1
Chilled water inlet
5
Coil heat exchanger
2
Chilled water outlet
6
Purge
valve
3
3-way valve
7
2-way valve (Opt.)
4
Plug fan
-
•7•
INNOV@-DMREF-R-IOM-0922-EN

General rules
•When installing or servicing the unit, you must strictly follow the rules provided in this manual, comply with
the directions on the units themselves and take all such precautions as are necessary.
•The fluids under pressure in the cooling circuit and the presence of electrical components may cause
hazardous situations during installation and maintenance work.
•Failure to comply with the rules provided in this manual or any modification made to the unit without prior
authorisation will result in the immediate invalidation of the warranty.
2 Inspection / Transport / Positioning
2.1 Inspection on receipt
On receiving the unit, check that it is perfectly intact: the unit left the factory in perfect conditions; immediately
report any signs of damage to the carrier and note them on the “Delivery Slip” before signing it.
Lennox S.p.A. or its agent must be promptly notified of the entity of the damage. The Customer must submit a
written report describing every significant sign of damage.
2.2 Lifting and transport
While the unit is being unloaded and positioned, utmost care must be taken to avoid abrupt or violent
manoeuvres. The unit must be handled carefully and gently; avoid using machine components as anchorages
or holds and always keep it in an upright position.
The unit should be lifted using the pallet it is packed on; a transpallet or similar conveyance means should be
used.
2.3 Unpacking
The packing must be carefully removed to avoid the risk of damaging the unit. Different packing materials are
used: wood, cardboard, nylon etc. It is recommended to keep them separately and deliver them to suitable
waste disposal or recycling facilities in order to minimise their environmental impact.
2.4 Positioning
Bear in mind the following aspects when choosing the best site for installing the unit and the relative
connections:
•positioning and dimensions of the coupling flanges and refrigerant connections;
•location of power supply;
•solidity of the supporting floor.
It is recommended to first prepare holes in the floor/wall for passing through the power cables and for the air
outlet (down flow units).
The dimensions of the air outlet and the positions of the holes for the screw anchors and power cables are
shown below:
All work on the unit must be carried out by qualified personnel only, trained to
do their job in accordance with current laws and regulations.
Warning; Before performing any kind of work on the unit, make sure it has been
disconnected from the power supply.
Warning: in all lifting operations make sure that the unit is securely anchored in
order to prevent accidental falling or overturning.
INNOV@-DMREF-R-IOM-0922-EN
• 8•

3 Installation
The NEW DMREF R air-conditioning unit is suitable for all environments except aggressive ones. Do not place
any obstacles near the units and make sure that the air flow is not impeded by obstacles and/or situations
causing back suction.
Fig. 7 Service area
Versioni CW
MODELLO
A(mm)
B(mm)
C(mm)
D(mm)
E(mm)
DMCD/UR0150 600 650 600 30 1998
DMCD/UR0170 600 650 600 30 1998
DMCD/UR0210 600 650 600 30 1988
DMCD/UR0250 900 650 600 30 1988
DMCD/UR0270 900 650 600 30 1988
DMCD/UR0320 900 650 600 30 1988
Versioni CW
MODELLO
A(mm)
B(mm)
C(mm)
D(mm)
E(mm)
DMCXR0150 600 650 600 30 2100
DMCXR0170 600 650 600 30 2100
DMCXR0210 600 650 600 30 2100
DMCXR0250 900 650 600 30 2100
DMCXR0270 900 650 600 30 2100
DMCXR0320 900 650 600 30 2100
The following steps should be carried out to ensure proper installation:
•Apply a anti-vibration rubber lining between the unit and the bottom.
•Position the unit on the floor / floorstand (base frame).
The recommended sizes for the power cables and emergency line are shown in the related electrical drawings.
•9•
INNOV@-DMREF-R-IOM-0922-EN

4 Humidifier
The installation of the humidifier requires the connection to the water supply and drain hoses.
To simplify installation, it is recommended to use hose with an inside diameter of 6 mm and an outside
diameter of 8 mm and the revolving 3/4”G connection, either straight or 90°.
A shut-off tap and a mechanical filter should be installed to trap any solid impurities.
The drain water is connected using a section of rubber or plastic hose resistant to 100°C, with a
recommended inside diameter of 32 mm.
The drain connector is suitable for heat sealing with polypropylene drain pipes.
IMPORTANT WARNING: the drain hose must be free, without backpressure and with a drain trap
immediately downstream of the connection to the humidifier.
The following conditions represent correct water connection:
•installation of a shut-off tap in the supply water line;
•presence of a mechanical filter in the supply water line;
•water temperature and pressure within the allowed values;
•drain hose resistant to temperatures of 100°C;
•minimum inside diameter of the drain hose of 25 mm
•minimum slope of the drain hose greater than or equal to 5°;
•electrically non-conductive sleeve.
•presence of a drain trap in the drain hose
INNOV@-DMREF-R-IOM-0922-EN
• 10•