Daily Operation And Maintenance; Common Malfunction And Solution - Gree HLR45SNa-M Installation And Operation Manual

Household (Townhouse) Central Air Conditioning Unit

5. Daily Operation and Maintenance

When adjustment and test had completed, daily operation such as turn on/off unit, switch cooling
and heating, and set parameter etc. are to be done through the manual control that installed indoor.
1) All safety protection settings in the unit are set well before outgoing, please don't modify them to avoid
damaging the unit.
2) The on/off control to fan coil in every room should be operated individually by temp. controller and the
3-speed switch installed in every room. When there is no connect control between host and fan coil, after the
last fan coil is turned off, host should stop.
3) Don't cut off power immediately after unit had stopped. If the unit stopped and disconnected to power
supply for more than 2 days, please switch on the power supply for more than 6h before restart the unit.
Otherwise, the unit may not be able to operate normally.
4) Don't put things on the unit or its accessories, keep all around dry, clean and well ventilation. Clean
it on time by professional personnel when there is much dust on fin of condenser to prevent the dust from
affecting the performance.
5) Don't block the air outlet and air intake vents of indoor fan coil, filter at air intake vent should be
disassembled and cleaned regularly. (it shall be done by professional)
6) Do add antifreeze into water system of heat pump unit, the additional proportion is shown in this
manual on page 26. Please let the professional to add the antifreeze. Please cut off the power supply before
adding the antifreeze. For cooling only unit, when it is not used in winter, do drain out all water in the unit and
pipeline to prevent the tube-in-tube heat exchanger, pipes and pump from breaking; when it is not sure water
in pipeline had drained completely, do add antifreeze into system pipeline. Don't cut off power supply when
turn off the unit, otherwise auto antifreeze operation protection will be useless.
7) To heat pump unit, if not for use for a long time, water in the pipeline will be the same temperature
as ambient water. In that case, cool air may blow out in winter when unit begins to operate in heating mode.
If there is no connected control system between host and fan coil, it is better to turn on host 5~10min before
turning on the unit for heating, then turn on indoor fan coil to heating mode directly after water in pipeline
become warmer; if there is connected control between host and fan coil, turn on a fan coil first and turn on
host for 5~10min, then turn on the fan coil in room that needs heating after water in pipeline become warmer.
These can prevent cool wind from blowing out in the first few minutes when fan coil is just turned on.

6. Common Malfunction and Solution

When there is problem occur during operation, please contact with our nearest local dealer or office.
The following phenomena are not malfunctions:
1) When cooling (heating in winter), load is small (i.e. little fan coils operate), temperature of system
water is lowered (raising) rapidly, antifreeze (anti high-temp) protection will work and will stop when water
temperature back to set point.
2) When heating, since the surface temperature of heat exchanger is lower than outer ambient temperature,
and when surface temperature of heat exchanger lower than 0 ℃ , there will be frost on the surface and affect
heat exchanging effect, thus the control system would conduct defrost regularly to melt the frost on the surface
of heat exchanger.
3) If unit is used at area where temperature at winter will below 0 ℃ , when system is in waiting state
(don't cut off power), and when ambient temp. and system water temp. are about 0 ℃ , in order to prevent
water system from freezing and damaging equipments, control system will conduct auto antifreeze operation,
start water pump and compressor until water temperature reach safe point.
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