Service manual

P9 OF 34
REMOTE CONTROL
LED DISPLAY
TIMER BUTTON
SET BUTTON
MODE BUTTON
FAN SPEED BUTTON
FRESH AIR BUTTON
AUTO CLEAR BUTTON
LED BUTTON
SLEEP BUTTON
ADJUSTMENT BUTTON
RUN/STOP BUTTON
IONIZER BUTTON
ELECTRIC HEATING BUTTON
LIGHT WAVE BUTTON
SWING BUTTON
P10 OF 34
1. Metering device is installed in this outdoor condensing unit, no other metering device needs to be field-installed
anywhere else.
2. One refrigerant filter/strainer is installed in the outdoor unit, no other filter/strainer needs to be field-installed
anywhere else, otherwise it may cause extra pressure drop and even system under-performance or other
problems.
3. If a refrigerant drier is to be field-installed, must be of enough size and correct flow-direction, following drier
manufacturer's instruction. Fail to do so may cause unit problems.
4. Must check the indoor unit for leakage by checking if the indoor unit still holds the pressurized charge, by
breaking the seal left at indoor refrigerant copper line connection, before connecting it to the inter-connecting
refrigerant copper lines. If for some reason the break is made before you check it, must pressurize it and
check for leakage.
5. Professionally conduct general refrigeration practice to connect copper lines and seal-tight correctly and
properly. Must insulate and secure both discharge and suction copper lines.
6. Must keep the two valves at outdoor condensing unit front-seated (closed), and pressurize the refrigerant flow
cavities between the inter-connecting copper lines and indoor unit to check leakage, before move on to
conduct vacuum leakage test (20-30 minutes under 500 microns recommended).
7. Then back-seat (open) the two valves to release refrigerant factory-precharged in the outdoor condensing unit,
into the inter-connecting refrigerant copper lines and indoor unit, ONLY if the system leakage is checked and
passed (pressurization and vacuum check).
8. Must check all thermal functions at the final stage of installation. Both liquid and gas lines at outdoor
condensing unit valves, should be cold at cooling mode, and hot at heat pump mode. If not cold or hot (E4 or
E5 error code may show up at indoor unit to shut off the system and warn for system checking, must contact
installer or service provider to check refrigerant charge and/or other items, accordingly. How cold or how hot it
needs to be, varies upon ambient temperature, refrigerant charge/pipe length, indoor unit conditions and so on.
ATTENTIONS-MUST READ AND FOLLOW THE FOLLOWING, PRIOR TO CONNECTING REFRIGERANT LINES
9. Adjust/check the refrigerant charge per pressure/temperature (super-heat or sub-cooling) at the service valves,
or length of copper pipes, following the pressure-ambient temperature chart or 25' breaking point rule as
factory-recommended in the installation manual.
YMGI, A COMFORT MAKER, A JOY COMPANION, A SATISFACTION GUARANTOR...YMGI, A COMFORT MAKER, A JOY COMPANION, A SATISFACTION GUARANTOR...