Haier MRV II User manual
Haier MRVⅡAir Conditioning
Haier MRVⅡcan be used in a large combination
with multiple outdoor units, it is only one system
and is the second generation of Haier C-MRV
product. Major features are energy saving,
intelligent control and precise temperature control,
for R410A system, that is more friendly for
environment as well.
To regulate the installation, commissioning and
maintenance procedure, and ensure the working
quality, also to improve the working efficiency, we
make this guide for reference.
This regulation is applicable for Haier A/C Elec.
Corp. Ltd.
Index
Part 1 Installation regulation------------------------------------------3
Part 2 Commissioning & Maintenance for R22 system---- 22
Part 3 Debugging & Maintenance for R410Asystem--------85
Part 4 Wiring diagram------------------------------------------------136
Part 1 Installation regulation
1. Installation flowchart-------------------------------------------------------4
2. Equipment delivery---------------------------------------------------------5
3. Outdoor installation--------------------------------------------------------6
4. Indoor installation----------------------------------------------------------8
5. Piping work------------------------------------------------------------------12
6. Water drainage pipe installation--------------------------------------14
7. Insulation treatment------------------------------------------------------15
8. Electric wiring--------------------------------------------------------------16
9. Pipe cleaning work--------------------------------------------------------18
10. Leakage test---------------------------------------------------------------19
11. Evacuation-----------------------------------------------------------------20
12. Additional Refrigerant Charging------------------------------------21
13. Trial operation-------------------------------------------------------------22
14. Transfer to user-----------------------------------------------------------23
- 3 -
Part 1
1 Installation flowchart
Take training for the user
Every unit should run normally
Recharge the refrigerant due to
the actual pipe length and the
size
Vacuum should be below 75
mmHg
Keep the pressure at 28kgf/cm
for 24 hours
Keep clean in the pipe
Select the proper cable and wire
It should be done for the whole
piping system
After installation
15. Transfer to the user
14. Debugging and trial running
13. Additional refrigerant charging
12. Evacuation
11. Leakage testing
10. Cleaning operation
9. Electric installation
8. Heat insulation
Pay attention to the gradient
Keep dry, clean and hermetic
Prevent the ventilation in short
circuit. Easy for maintenance
Confirm the model to avoid the
mis-installation
Confirm the person responsible
for each process
Prepare the material,equipment
and worker's training
Confirm the selected model,
position, pipe size, layout direction
Important points
in installation
7. Condensate water drainage
6. Refrigerant pipe layout
5. Outdoor installation
4. Indoor installation
3. Working distribution
2. Working preparation
1.Engineering drawing
before installation
Process
- 4 -
Part 1
2 Equipment delivery
2.1 After the equipment is delivered to the site, all relative persons should
join the unpacking and checking work.
2.2 Pay attention to the below points when unpacking:
a. Check the equipment name, model, specification and the quantity, etc.
b. Suspend the equipment to the site or near the site before unpacking
the unit. Forbidden to suspend the unit after unpacking to avoid being
damaged.
c. When unpacking, do not operate wildly to avoid being damaged.
d. Check if the accessories are complete due to the packing list after
unpacking. Any question, contact the after-sale persons.
- 5 -
Part 1
3 Outdoor installation
3.1 The unit should be placed far away the flammable, explosive or oily
place.
3.2 The noise and the outlet air should not affect the neighbors.
- 6 -
3.3 There should be enough space for air inlet, air outlet and
maintenance around the unit. Fluent ventilation and good heat release. If
there is obstacle above the unit, it must be over 2m away from the air
outlet, or there should be extended duct.
3.4 The floor and the steel bracket should be strong enough to afford the
1.5 times heavier than the unit running weight. The floor and the steel
bracket should be horizontal.
Part 1
3.5 The bottom of steel bracket should be made from 6# channel steel.
3.6 The floor should be over 100mm higher than the ground, and there
should be the drainage around to ensure the unit not being immersed in
the water.
3.7. The unit should be fixed firmly with the anti-vibration cushion.
3.8. The outdoor should be as near the indoor as possible. Shorten the
pipe and decrease the bend pipe. Pipe length can not exceed the
permitted range.
3.9 Avoid the dangerous place which could be easily damaged by
monsoon, typhoon and earthquake, if possible, do not install the unit in
the air.
- 7 -
Part 1
4 Indoor installation
A. With the shortest refrigerant pipe, and convenient to connect with
distributing pipe and water pipe. Water pipe should keep a 1% gradient
at least.
B. The place for indoor unit installation should be strong enough to
afford the unit weight and running shake.
C. Preset a checking hole near the indoor unit, and there should be
enough space for maintenance, and convenient to maintain or change
the PCB and motor.
D. Ensure air return and air discharging fluent, and prevent ventilation
in short circuit , also air return duct and air outlet duct is necessary.
E. Before installation, please check if the unit appearance has been
damaged or the other abnormal after being unpacked. Also please check
if the accessories are complete, and the accessories should be
transferred to the special person for proper preservation.
F. The unit should be fixed firmly to avoid falling and shaking. After
installing the indoor unit, please check it with a gradienter to ensure the
indoor unit is horizontal.
- 8 -
Part 1
4.1 Wall mounted unit installation
installation figure:
mounting plate
gas pipe
liquid pipe
indoor side outdoor side
through-wall hole
wall thickness
through-wall hole section
adhesive tape
fresh air pipe
heat insulation
4.1.1 Fix the mounting plate, set the through-wall hole: install the unit on
smooth wall beside beam and pillar. Firstly , fix the mounting plate on the
wall with a steel nail ,use a thread with a screw ,drop it down vertically
from the central top of the mounting plate,(or you can use a gradienter)to
find the horizontal place and fix it. Drill holes in the wall according to the
wall mounting plate’s position , put plastic sleeve into the hole, then
fasten the plate securely with 4*25 screw .
4.1.2 Make through-wall hole : make a throughout hole in the wall , after
installation , please seal it with putty or gesso.
4.1.3 Hang the unit body onto the upper notches of the mounting
plate ,move the body from side to verify its secure fixing.
- 9 -
Part 1
4.2 Cassette unit installation
air outlet air outlet
air inlet
4.2.1 To ensure the air conditioner working effect, the installation height
should be less than 3m.
4.2.2 After installation on the ceiling ,check the unit’s horizontal level ,use
a gradienter to check it.
4.2.3 Set a checking hole bigger than 400*400mm for checking and
maintenance .
4.3 ESP duct unit installation
Ceiling
Air return
A
Building roof
Air return box
Air supply duct Unit
Air outlet
grille
Air supply
Unit
Air return
Air return box
- 10 -
Part 1
4.3.1 The indoor unit can be installed on the ceiling, which height is no
more than 3m.
4.3.2 Install the unit with suspending pole, check if the installation place
can bear the unit.
4.3.3 Fix the indoor unit to the suspending bolt, if necessary, it is possible
to suspending the unit to the beam, etc.
4.3.4 Adjust the horizon with a gradienter or by the following method.
Make adjustment so that the relation between the lower surface of the
unit and water level in the hose becomes what is shown in the figure.
PVC pipe
0~5 mm
(0~0.2")
Piping side
Water level
make the piping side slightly lower.
Supply water
4.3.5 Notice for high static pressure duct unit
4.3.5.1 In order to reduce the noise level of the working room , it is better
not to install indoor unit in the working room ,especially for the room
where need a strict noise level. Indoor unit can be installed in a special
room or stair well, and connect with working room by air sending duct and
air return duct.
4.3.5.2 High static pressure duct unit is designed for duct type air
- 11 -
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