Unit installation

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PRESSURE CHECKING
System pressure checking is one of the basics to find out the status of system performance and
diagnose any problems.
The following curves are only reference for system pressure checking. Actual pressures may vary upon many
factors such as inter-connecting pipe length, refrigerant charge / leakage level, elevation difference between
indoor unit and outdoor unit, tool calibration, reading error, and so on.
Warning:
R410A refrigerant bears higher pressures than R22. Only handled by Licensed HVAC technician.
OPERATION FREQUENCY
CONDENSING PRESSURE (MPa (G))
5804.0
3.5
3.0
2.5
2.0
1.5
0
507
435
362
290
217
0
20 40 60 80 100 120 140
CONDENSING PRESSURE (PSI (G))
SYSTEM INSPECTION AND TRIAL RUNNING
Evacuate the pipes between indoor and outdoor units, using vacuum pump and manifold/gauge set, to a
minimum of 500 microns (service valves remain front seated). Hold for 30 minutes to check if the vacuum level is
maintained. Using dry nitrogen or other leakage detection tool for leak checking. Be certain there is no pressure
in the system when repairing a leak.
Vacuum before Releasing Refrigerant from Outdoor Unit to Indoor Unit.
VACUUM REFRIGERANT PIPES
DURING INSTALLATION
YMGI, A COMFORT MAKER, A JOY COMPANION, A SATISFACTION GUARANTOR...
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USER NOTES AND SERVICE LOG
CHECK AFTER INSTALLATION AND TEST OPERATION
YMGI, A COMFORT MAKER, A JOY COMPANION, A SATISFACTION GUARANTOR...
1. Before test operation
(1) Do not turn on power before installation is finished completely.
(2) Electric wires must be connected correctly and securely.
(3) Cut-off valves of the connection pipes should be back seated/tunned on.
(4) All the impurities such as scraps and thrums must be cleared out of the unit.
2. Test operation method
(1) Switch on power, press "ON/OFF" button on the wireless remote control to start the operation.
(2) Press MODE button, to select the COOL, HEAT (not available for cooling only unit is ), FAN and so on to check :
* All the functions (to make sure the unit functions correctly and poroenty).
* Refrigerant (pressures/temperatures at sericea values/pipes should be good).
* Drainage (condensate/water flow should be dripping out of drainage pipe ONLY).
* Noise (there should be no abnormal symbol)
Has the been unit positioned firmly?
The unit may drop, shake or emit noise.
Have you done the refrigerant leakage test?
It may cause insufficient cooling(heating)
capacity.
Is heat insulation sufficient?
It may cause unexpected condensate and
dripping.
Is drainage pipe tested ?
It may cause leakage or unexpect dripping.
Is the voltage in accordance with the rated
voltage marked on the nameplate?
It may cause electric malfunction
or damage to the part/unit.
Is the electric wiring and piping
connection installed correctly and securely?
It may cause electric malfunction
or damage to the part/unit.
Has the unit been connected to a secure
earth connection?
It may cause electrical leakage.
Is the power cord specified properly per
NEC codes ?
It may cause electric malfunction
or damage to the part/unit.
Is the air inlet and outlet been cleared?
It may cause insufficient cooling(heating)
capacity, and unexpected noise.
Has charge be adjusted to mateh the
and refrigerant capacity been recorded?
The refrigerant unit noise, iced up
overheat insufficient cooling or heating
Items to be checked
Possible malfunction
CHECK AFTER INSTALLATION
TEST OPERATION
Service valve
Hexagon Allen wrench
(Front seat to close,
back seat to open)