Gree GMV-Pdhm224W/Na-M Supplement

HEAT RECOVERY D.C INVERTER MULTI VRF
Installation and Operating Instruction Manual
This Manual is applicable to following outdoor units:
Basic Model：
GMV-Pdhm224W/Na-M GMV-Pdhm280W/Na-M
GMV-Pdhm335W/Na-M GMV-Pdhm400W/Na-M
GMV-Pdhm450W/Na-M
Combined Model：
GMV-Pdhm504W2/Na-M ～GMV-Pdhm1800W4/Na-M
Please read this Manual carefully before
installation and use.

Thanks for your selection of Gree Air Conditioner Unit. Before use, please read this instruction
manual carefully and keep it properly to ensure correct use of this machine.
Instruction to Users 1
Safety Considerations 3
Selection of Installation Location and Precautions 8
Installation of Outdoor Unit 14
Connection of Indoor and Outdoor Units 25
Communication of the System 44
Notice for Project Installation 64
Installation Guideline for Air
Conditioner Unit
Filling of Refrigerants and Test Run 66
Operating Principle of Muti-split and Heat-recovered Air-Conditioning
Units 68
Types of Indoor Units to Be Integrated 70
Maintenance Measures 71
Reclaim refrigerants 72
Troubleshooting 75
Operating Temperature Range and Rated Work Conditions of the Unit
80
Performance Parameters of the Unit
81

1
Instruction to Users
☆ During using the unit under only-cooling /heating mode, the total capacity of indoor
units which are running simultaneously shouldn’t be more than that of outdoor unit,
or else poor cooling/heating capacity of each indoor unit will be resulted in. Under
principal-cooling /heating mode, the total capacity of indoor units as principal part
which are running simultaneously shouldn’t be more than that of outdoor units，or
else poor cooling /heating capacity of each indoor unit will be resulted in.
☆According to capacity of each indoor unit, an air switch (or fuse) to each indoor unit
and a master switch to all indoor units should be installed. Each air switch, which is
usually shut off, is used for short circuit protection and abnormal overload of
corresponding indoor unit。The master switch is used for unified power supply for
all indoor units or shut-off of power supply.
☆For smooth start of air conditioner unit, the main power switch shall be put to “ON”
position 8 hours before start.
☆Upon receiving STOP signal from each indoor unit, the fan of related indoor unit will
continue to work for 20~70 seconds for purpose of utilizing the remaining cold air
or heats in heat exchanger and also make preparations for next use. This is normal.
☆ During installation, do not mix communication lines with power cables. Be sure to
separate them at minimum spacing over 20cm; otherwise it might result in
communication problem.
☆ If switch between cooling / dry mode and heating mode of indoor unit occurs or if
indoor unit is off under heating mode, brief flowing sound of refrigerants of cooling
and heating mode exchanger may occur ,which is normal.
☆ Install the cooling and heating mode exchanger in the place like corridor where
noise requirement is correspondingly lenient, furthermore, it should be installed in
ceiling with good sound insulation. Avoid installing it in the place like bedroom,
ward or office where low noise is required.
☆An all-pole disconnection switch having a contact separation of at least 3mm in all
poles should be connected in fixed wiring

2
☆electric supply tolerances: (220-240V)±10%, (50±1)Hz
☆humidity :30-95%
☆installation altitude :max 1000m
☆transport/storage temperature : -25-55°C.
☆Main switch provided by end user: main switch handle should be black or gray and it
can be locked in “OFF” position with padlock
☆The main disconnection device should be explained in user manual and the height
should be recommended as 0.6-1.7m. Over current protection is required (EN
60947-3, EN 60947-2)

3
Safety Considerations
1．Please read this manual carefully before use and operate correctly as instructed in the manual.
2．You are specially warned to note the two symbols below.
WARNING!: A symbol indicates that improper operation might cause human death or severe
injuries.
CAUTIONS!: A symbol indicates that improper operation might cause human injury or
property damage.
WARNING!
zPlease seek an authorized repair station for installation work. Improper installation might cause water
leakage, electric shock or fire.
zPlease install at a place strong enough to support the weight of air conditioner unit. If not, the air
conditioner unit might fall down and cause human injury or death.
zTo ensure proper drainage, the drainage pipe shall be correctly installed according to installation
instructions. Take proper measures for heat preservation to prevent condensing. Improper installation of
pipes might cause leakage and wet the articles in the room.
Do not use or store flammable, explosive, poisonous or other dangerous substances beside the air
conditioner.
zIn case of trouble (e.g. burnt smell), please immediately cut off the main power of air conditioner unit.
zKeep air flow to avoid shortage of oxygen in the room.
zNever insert your finger or any objects into air outlet and inlet grill.
zPlease take constant care to check if the mounting rack is damaged after long use.
zNever modify the air conditioner. Please contact the dealer or professional installation workers for repair
or relocation of the air conditioner.

4
Safety Considerations
Cautions!
zCAUTION FOR REFRIGERANT LEAKS
(Point to note connection with refrigerant leaks)
Introduction
The installer and system specialist shall safety against leakage according to local regulations or standards.
The following standards may be applicable if local regulations are not available. The GMV-Pdhm System
like other air conditioning system uses R410A as refrigerants.R410A itself is an entirely safe non-toxic,
non-combustible refrigerants. Nevertheless care must be taken to ensure that air conditioning facilities are
installed in a room which is sufficiently large. This assures that the maximum concentration level of
refrigerant gas is not exceeded, in the unlikely event of major leak in the system and this in accordance
with the local applicable regulations and standards.
Maximum concentration level
The maximum charge of refrigerants and the calculation of the maximum concentration of refrigerants is
directly related to the humanly occupied space in which it could leak.
The unit of measurement of the concentration is 1b/ft³(the weight in 1b of the refrigerant gas in 1 ft³
volume of the occupied space).
Compliance to the local applicable regulations and standards for the maximum allowable concentration
level is required.
1).Direction of the refrigerant flow
2).Room where refrigerants leak has occurred (outflow of the entire refrigerants from the system).
Pay a special attention to the place, such as a basement, etc. where refrigerant can stay, since refrigerant
is heavier than air.
Procedure for checking maximum concentration .Check the maximum concentration level in accordance
with steps 11 to 4 below and take whatever action is necessary to comply.

5
Safety Considerations
1. Calculate the amount of refrigerants (1b) charged to each system separately.
Amount of refrigerants in a single unit system (amount of refrigerant with which the system is charged
before leaving the factory)
+
Additional charging amount (amount of refrigerant added locally in accordance with the length or
diameter of the refrigerant piping)
=total amount of refrigerants (1b) in the system.
NOTE
Where a single refrigerant facility is divided into 2 entirely independent refrigerant systems then use
the amount of refrigerants with which each separate system is charged.
2. Calculate the smallest room volume(ft³)
Incase like the following, calculate the volume of (A), (B) as a single room or as the smallest room.
A. Where there are no smaller room divisions
B. Where there is a room division but there is an opening between the rooms sufficiently large to
permit a free flow of air back and forth.

6
Safety Considerations
1).opening between rooms.
2).partition.
(Where there is an opening without a door or where there are openings above and below the door which
are each equivalent in size to 0.15% or more of the floor area.)
3).Calculate the refrigerant density using the results of the calculations in steps 1 and 2 above.
Total volume of refrigerants in the refrigerant system ≤maximum concentration level(1b/ ft³)
Size (ft³) of smallest room in which there is an indoor unit installed. If the result of the above
calculation exceeds the maximum concentration level then make similar calculations for the second
then third smallest room and so unit the result falls short of the second then third smallest room and
so until result falls short of the maximum concentration.
4).Dealing with the situations where the result exceeds the maximum concentration level and where the
installation of a facility encounters problem then it will be necessary to revise the system. Please consult
your GREE supplier.
zBefore installation, please check the power supply for compliance with the ratings on nameplate. Check
the power safety as well. (it shall be done by professionals)
zBefore use, please check and confirm if the cables, drainage pipes and pipelines are correctly
connected, hence to eliminate the risk of water leakage, refrigerants leakage, electric shock or fire(it
shall be done by professionals)
zMain power must be securely earthed to ensure effective grounding of air conditioner unit and avoid the
risk of electric shock. Please do not connect the earthing cable to coal gas pipe, water pipe, lightning
rod or telephone line.
zOnce started, the air conditioner shall not be stopped at least after 10 minutes or longer; otherwise
service life of the unit will be affected.

7
Safety Considerations
zDo not let the child to operate the air conditioner unit.
zDo not operate the air conditioner unit with wet hands.
zPlease disconnect the main power before cleaning the air conditioner or replacing the air filter.
zPlease disconnect the main power if the air conditioner unit is out of use for a long period.
zThis appliance is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible for their safety.
zChildren should be supervised so that they can not play with the appliance.
zPlease do not expose the air conditioner unit directly under corrosive environment with water or
moisture.
zPlease do not put on or place any goods on air conditioner unit.
zAfter electrical installation, the air conditioner unit shall be energized for electrical leakage test. (it shall
be done by professionals)

8
Selection of Installation Location and Precautions
●Selection of Installation Location for Air Conditioner Unit
The installation of air conditioner unit must be in accordance with national and local safety
codes.
Installation quality will directly affect the normal use of air conditioner unit. The user is
prohibited from installation himself. Please contact your dealer after buying this machine.
Professional installation workers will provide installation and test services according to
installation manual.
Do not power on until all installation work is completed.
●Selection of Installation Location for Indoor Unit
Avoid☆exposing in sunshine.
Ensure the hanger rod, ceiling and building structure have sufficient strength to support the weight of air☆
conditioner unit.
☆Drainage pipe is easy to connect out.
☆Air inlet and outlet is not blocked.
Indoor and outdoor connection pipes are easy to go outdoors.☆
Do not install at a place where flammable or explosive goods exist or flammable or explosive gas might☆
leak.
Do not install at a place☆where there are corrosive gas, severe dust, salty fog, smoke or heavy moisture.
Select Installation Location of Outdoor Unit
Outdoor unit must be installed on a firm and solid support.☆
Outdoor unit shall be installed close to the indoor unit, hence to minimize the length☆and bends of cooling
pipe.
Avoid placing the outdoor unit under window or between two constructions, hence to prevent normal☆
operating noise from entering the room.
Air flow at inlet and outlet shall not be blocked.☆
Install at a well☆-ventilated place, so that the machine can absorb and discharge sufficient air.
Do not install at a place where flammable or explosive goods exist or a place☆where there are severe dust,
salty fog and polluted air.
Do not install induced draught pipe at the inlet and outlet of the outdoor unit. When the air
conditioner unit is generating heats indoors, the condensate water may flow from the base
of outdoor unit. When outdoor air is below 0 (32 ), the condensate water will be frozen.℃℉
Take care that the installation of outdoor unit shall not affect the heat radiation of the unit.